Acura RL — BrandWiki

Acura RL

Overview

First generation

aka	Honda Legend
production	December 1995–2004‡R3R‡
model years	1996–2004
designer	Mitsuhiro Honda Tamotsu Okamoto (1993)‡R4R‡
layout	Front-engine, front-wheel-drive
engine	3.5 L V6 C35A1
transmission	4-speed automatic
wheelbase	114.6 in
length	1996–1998: 195.1 in 1999–2001: 196.6 in 2002–2004: 196.7 in

The Acura RL is a mid-size luxury car that was manufactured by the Acura division of Honda for the 1996–2012 model years over two generations. The RL was the flagship of the marque, having succeeded the Acura Legend, and was replaced in 2013 by the Acura RLX. All models of the Legend, RL and RLX lines have been adapted from the Japanese domestic market Honda Legend. The model name "RL" is an abbreviation for "Refined Luxury."[2]

The first-generation Acura RL was a rebadged version of the third-generation Honda Legend, and was first introduced to the North American market in 1996, to replace the second-generation Acura Legend. The second-generation Acura RL was a rebadged version of the fourth-generation Honda Legend, introduced to the North American market in September 2004, as a 2005 model. This iteration of the RL received an extensive mid-generational facelift for the 2009 model year, and a further update for 2011. The third-generation debuted for the 2014 model year as the

width	1996–1998: 71.3 in 1999–2001: 71.4 in 2002–2004: 71.7 in

height	1996–1998: 54.5 in 1999–2001: 56.5 in 2002–2004: 54.5 in

weight	1,660–1,778kg (3,660–3,920lb)

model code	KA9

First generation (1996)

1996 (KA9)

In 1996, Acura introduced the Acura 3.5RL, known internally as "KA9," to replace the Legend. Acura dropped the Legend name when market research showed that consumers referred to Acura products by their model names, "Legend" and "Integra," and did not necessarily associate the names with Honda's "Acura" brand.[5][6]

The 3.5RL's longitudinally mounted V6 gasoline engine had its center-line mounted in-line with the car's axis, and not transversely (i.e., 90 degrees offset from the vehicle axis) like most other front-wheel-drive cars. As a result, the longitudinal placement of the engine allowed for a smaller turning radius and easy in-town maneuverability, as well as 56/44 front/rear weight distribution for the 1996MY. Some of the engine's internals such as the connecting rods and the crankshaft are forged. The connecting rods in particular are of note as they use a new process called "block forging".[7] The engine also employs a balance shaft in order to reduce NVH. A 4-speed automatic transmission equipped with Gradelogic is standard for all trim levels. The 3.5RL uses a double wishbone front and multilink rear suspension. Both the front and rear suspension uses coil springs with progressive shock absorbers. Some bushings on this car are liquid filled in order to reduce harshness over bumps. This car uses speed-sensitive rack and pinion steering. Furthermore, some models were equipped with TCS also known as traction control. A powered moonroof is standard for all models. OE tire size was 215/60R16 mounted on 16x6.5" rims. The body was finished in a 23 step, 5-coat, 4-bake paint process. An optional HDD based GPS navigation system was available in California for 1996. A cellular phone fitted in the center console was an optional extra.[7]

1998

In 1998, the pre-facelift 3.5RLs received minor improvements. The Base and Premium trims received a new directional, spiral rim design. A one-year Special Edition trim level was offered which included two 2-tone paint schemes and unique 16x6.5" 7-spoke alloy rims.[8]

1999

For the 1999 model year, the 1999 3.5RL received a front and rear facelift with integrated foglights, revised bumpers, hood, headlights, taillights, trunk, and fenders as well as driver and front passenger side-impact airbags. The suspension and chassis were stiffened, and new 8-spoke 16x7" alloy wheels were fitted. HID low-beam headlights became standard. Aerodynamics were improved as drag coefficient was reduced to 0.32 from 0.34 and lift coefficient was decreased to 0.102 from 0.155. The interior design changed somewhat, as some wood was removed from the dashboard. The steering wheel has changed in design with a floating horn switch instead of the 2 horn buttons on the 96-98' RLs. Homelink became standard. The brakes were revised to be larger than pre-facelift models. Front and rear brake rotors are larger and thicker and new calipers are used to house bigger brake pads. New control arms were fitted to improve handling.[9]

2000

In 1999, a larger navigation system screen was added for the 2000 model year. Along with that larger screen came the conversion to easy-to-replace DVD map databases. The emissions systems were revised to allow the car to be granted "LEV" status. The TCS system was replaced with the VSA system. VSA is an electronic stability program that allows the car to mitigate under and oversteer using both the anti-lock braking system and TCS to improve stability in harsh cornering situations.[10]

2001

For the 2001 model year, the 3.5RL had child seat latches added to the rear deck, and a manual trunk release was added as well.[11]

2002

The 2002 model year 3.5RL received painted lower trim and mudflaps along with redesigned 7-spoke alloys and a newer, sportier suspension setup which included new springs, dampers, larger and solid sway bars, and new front upper control arms. A new dual-diaphragm master cylinder was fitted to allow for increased braking with reduced pedal force. The ABS was revised and became 4 channel all the time. The OE tire size changed to 225/55R16. OE tires were the Michelin Pilot HX MXM4 rated at 94V. The revised engine produced 225 hp and 231 lbft of torque due to a new variable-muffler. More insulation was added in the engine compartment for 2002. OnStar became standard for the 2002 model year. The Onstar antenna is mounted on the roof.[12] Service was terminated in 2008 with the discontinuation of the 1G AMPS service in the U.S.

2003

For the 2003 model year, RLs received clear turn signal lenses in the rear lights, a new 10-spoke alloy wheel design, larger emblems, and various interior upgrades including new wood staining and a new interior color scheme.[13]

2004

For the 2004 model year, the 3.5RL offered as standard equipment a revised navigation system and integrated satellite radio in the Continental United States in addition to a redesigned center console and chrome door lock pulls. The 2004 3.5RL was the first production saloon car to offer satellite radio as standard equipment. As a result, the antenna design was revised to include a body-colored base for the XM radio. The Bose audio system saw 2 new tweeters added next to the 6.5" speakers in the front door. The 6-Disc CD changer was moved on the dashboard instead of inside the trunk like previous years. As a result, the climate control system was revised to have the controls integrated with the navigation system instead of analog dials and buttons like on previous years. The amplifier was revised to accommodate the new tweeters. New gauges were fitted for the 2004 model year. A new, thicker steering wheel was fitted for the 2004MY as well as a new steering wheel airbag. In the lower 48 there was only one available factory trim level. The only options available were dealer options.[14]

The 1996–2004 3.5RL's engine was the last in the Acura lineup not to use Honda's variable valve timing system (VTEC), This 3.5 L 90-degree V6 engine was internally designated as the C35A, and was the last of the Honda C engine V6 engines used in Honda and Acura lineups, being replaced by the newer Honda J engine 60-degree V6 engines. The 2004 RL was also the last Acura to use the numeric designation (i.e., 3.5) for its engine displacement.

Second generation (2005)

2005 (KB1)

The new-generation car, known internally as "KB1," was launched in late 2004 for the 2005 model year. The car was born as Prototype version at 2004 New York International Auto Show. Without the rumored V8 engine, it featured an all-wheel drive system marketed by Acura as "Super Handling-All Wheel Drive" (SH-AWD). It integrated active differentials with the all-wheel-drive system and traction control to improve handling, similar to the "ATTS" system featured on the 1997 Honda Prelude SH. At the time of its introduction, the Acura RL's SH-AWD was the first all-wheel-drive system to vary the distribution of power not only from front to back, but also side to side in the rear using a technique called torque vectoring. The RL can direct up to 70% of available torque to the rear wheels, and up to 100% of that available rear torque can be directed to just one wheel. In combination with a specially designed planetary gear-set which can over-drive the rear wheels at up to five percent greater speed than the front wheels, the torque directed to one wheel, or torque vectoring, can have a steering effect. As the car speeds around a curve, torque vectored to the outside rear wheel will push the rear end around the curve faster, just as paddling the outside oar of a row boat faster than the inside oar will cause the row boat to turn, to minimize the understeer common in front-heavy vehicles.

The first-generation RL had been powered by the 225 hp 90-degree C-series non-VTEC V6 gasoline engine. The second-generation RL used a newer design 60-degree J-series 3.5 L V6 SOHC VTEC gasoline engine delivering 300 hp, (later revised to 290 hp due to amended SAE testing procedures). To give the car a more sporty feel, the car featured drive-by-wire throttle control and a five-speed sequential sport shifting automatic transmission with shift paddles mounted on the steering wheel. As with the first-generation Acura RL, the second-generation Acura RL required premium unleaded fuel rated at 91 (R+M)/2 octane.

A first for the RL was the use of aluminum four-piston front brake calipers over 12.6-inch cast-iron ventilated front rotors. These multi-piston calipers, derived from racing applications, are extremely rigid. In the rear, 12.2-inch cast-iron ventilated discs attached to their hub with lightweight aluminum collets were gripped by one-piston aluminum brake calipers.[15] The RL was equipped with unique five-spoke 17-inch alloy wheels and Michelin Pilot HX MXM4 245/50R17 98V[15] all season grand touring tires.

New features on the 2005 RL included a keyless entry system that allowed the driver to both lock and unlock the car by touching the door handle without having to use the remote control, and a keyless start system. A new 260 watt, ten speaker Bose DVD-Audio 5.1 sound system equalized for the RL cabin featured several Bose technologies.[16] Bose AudioPilot is a noise compensation technology which analyzes background environmental cabin noise and uses an algorithm based on cabin acoustics to boost certain portions of the musical signal so that it may be heard more clearly above environmental sound "clutter" without any apparent change in volume.[17] Bose Centerpoint processes stereo and matrix surround sound recordings to allow play through the 5.1 sound system even though the source may only be a stereo sound track. Bose Active Noise Cancellation (ANC) rounded out the suite. The ANC was always on, whether the stereo was on or not. The ANC took input from two microphones placed in the cabin to analyze drivetrain-related low-frequency sound waves entering the cabin. The ANC sent information to the sound system to create a precisely shaped and timed reverse-phased audio signal from the door speakers and the subwoofer. The result was a dramatic reduction in perceived engine and exhaust noise.

XM Satellite Radio, integrated Bluetooth hands-free technology for wireless phone use, voice recognition technology with over 560 voice commands to control navigation system and displays, wireless phone, audio system, heating and ventilation controls rounded out the cabin's technological features. Heating and air conditioning systems were tied into a solar sensor and GPS positioning so that cabin temperature remained constant in a mixed sun and shade situation. Based on sun position and cabin orientation, the system could automatically send additional cooling air to the sunny side of the car to keep that occupant comfortable, while not freezing out the occupant on the shady side.

The Alpine Electronics DVD-based navigation system was integrated with an 8-inch LCD and a multi-use Interface Dial, which could move up, down, left and right like a mouse, turn like a knob, scroll through preset menus, and click when pushed to act as a selector button. Unlike many in-car navigation systems, the Alpine DVD-based navigation unit allowed the driver to change destinations and routes "on the fly" while driving, rather than being locked out unless the car was in Park. The tightly integrated voice recognition system worked with the navigation system and could recognize spoken city and street names. Also unique at the time was two-way communication via AcuraLink satellite communication. Using a facility of XM Radio service, the system could send a variety of messages to the car, including service appointment reminders (appointments first made via Internet) or important messages such as recall notices. The use of OnStar was carried over from the previous generation RL. Use of digital/analog trimode (two digital bands and one analog band) technology allowed the 2005 RL OnStar technology to survive the planned 2007 phase-out of the analog OnStar to fully digital OnStar service.

Other new RL features included the Active Front Lighting System, in which the high intensity discharge headlamps swiveled in concert with the steering up to twenty degrees, for improved night cornering vision. Light emitting diodes (LED) replaced traditional incandescent bulbs in the tail and brake lights, the turn signals integrated in the side mirror housings, and many interior cabin lights.

The 2005 RL was also the first Honda vehicle to use the Advanced Compatibility Engineering (ACE) body structure, which has since proliferated throughout every newly introduced Honda and Acura vehicle design. The ACE structure features extensive use of high-tensile steel and lightweight aluminum components in a front-mounted polygonal main frame, designed to engage vehicles of differing size and weight in a frontal collision and spread the forces through multiple structural pathways, while preventing or minimizing cabin deformation. In practical terms, this means in an SUV versus ACE structure car collision, there is a greater chance that the ACE body structure will engage with the SUV's frame and dissipate collision forces around the passenger compartment. In more conventional non-ACE car structures, the SUV frame has a much greater chance of missing or over-riding the conventional car's major structural components and a greater chance of deforming the passenger compartment.

The 2005 RL car structure used aluminum alloy in the hood, front fenders, trunk lid and frame, front and rear subframes, suspension arms, front knuckles and bumper beams. Magnesium was used in the intake manifold, and the two-piece center drive shaft was made of a carbon reinforced composite. The new RL featured extensive aerodynamic design treatment including details such as flush side glass, plus underbody covers and diffusers to reduce lift, resulting in a very low drag coefficient of 0.29.

2006

For 2006, the Acura RL was also offered in a second trim level, the optional 'Technology Package' which included three new features: adaptive cruise control (ACC), Collision Mitigation Braking System, and Michelin PAX System run-flat tires on unique PAX 235 mm x 460 mm A ("A" for asymmetric) aluminum alloy wheels with unique 245-680R460A Michelin Pilot HX MXM4 all-season Grand Touring type radials designed for the Michelin PAX System. The metric sized, run-flat Michelin PAX System wheels and tires are equivalent to 18 x wheels and 245/45-R18 conventional tires. The previously standard color-matched mud guards were removed in 2006. All 2006 models had a slight change to the navigation system that allowed the installation of an optional rearview camera.[18]

2007

For 2007, the Acura RL was offered in three trim levels: a "standard" or "base" package; a newly defined "Technology Package;" and the highest level trim, the "Technology Package with CMBS/PAX."

Base model cars were well equipped, but deleted certain features such as the navigation system and Adaptive Front Lighting System (AFS), and substituted plastic simulated wood for the dashboard maple wood trim.

Technology Package cars were essentially the same as the 2005 and 2006 standard models, coming with navigation and AFS, while adding as standard equipment a rear backup camera and a 3.5 mm stereo input jack for Apple iPod and other MP3-type devices.

The Technology Package plus CMBS/PAX trim level had no 2005 equivalent, though it was most similar to the 2006 Technology Package that had also included ACC/CMBS and PAX technologies. While the label "CMBS/PAX" might appear to indicate ACC was dropped as a feature, in reality, ACC was an extension of the CMBS system, and so was included.

As noted above, the MP3 audio player feature (usable for any device with a 3.5 mm headphone jack) was added to all trim levels. An integrated rearview camera was added to the top two trim levels. An integrated rearview camera could be added to the non-navigation Base model as a dealer installed option. The Base model optional rearview camera was installed in the same manner and position as on the 2006 models, mounted dead center in the trunk trim, with the trunk release button displaced to the right of center (passenger side). The difference was subtle, but the factory rearview camera installation on the Technology Package and the Technology Package with CMBS/PAX is to the left side (driver's side) of the center-mounted trunk release.

In 2005 and 2006, all models came standard with "genuine curly maple wood dashboard trim." With the introduction of three trim levels, the genuine curly maple wood dashboard trim became only available on the two higher level cars: the Technology Package and the Technology Package with CMBS/PAX. OnStar was deleted as a feature from all trim levels.

2008

The 2008 Acura RL continued unchanged in the U.S. market from the 2007 model, with three trim levels. Colors were added and deleted.[20]

In Canada, the 2008 Acura RL was available in two different models, Base and Elite Package. The Elite Package added Collision Mitigation Braking System (CMBS), Active Front Lighting System (AFS), Adaptive Cruise Control (ACC), heated and cooled ventilated front seats, and burled maple wood trim.

2005–2008 A-Spec Performance Package

For the 2005–2008 models, Acura offered an A-Spec package for the RL. The dealer-installed package consisted of a body kit, badging, revised suspension and different wheels. The package was first announced at a late 2004 Specialty Equipment Market Association (SEMA) trade show in Las Vegas.[21] The A-Spec package for sale was distinctly different from the Acura RL A-Spec Concept Vehicle announced and shown as a striking dark red one-of-a-kind custom creation in early 2005 at the Detroit Auto Show.[22]

The performance part of the package included the A-Spec sport suspension and A-Spec 18-inch alloy wheels, which allowed the use of more sports-oriented lower profile tires.

The A-Spec sport suspension changed out the four spring and damper (shock absorber) strut assemblies. The A-Spec suspension featured lowering springs (approximately 0.75 inch) and re-valved dampers. The ride was stiffer, but not overly so, and handling was improved with less body roll, more controlled cornering and enhanced feel. Reportedly Acura chose to make the RL's A-Spec suspension more compliant than the very stiff A-Spec sport suspension upgrade for the Acura TL, in keeping with the two different missions of the cars: luxury for the RL, luxury sport for the TL. Acura RL A-Spec retained the same suspension geometry as the stock Acura RL suspension alignment specifications.

The other A-Spec performance upgrade was a set of A-Spec 18x8 inch alloy wheels. The 10-spoke lightweight design was about the same weight as the 5-spoke, 17x8" standard wheels. Recommended tires were either the Michelin Pilot Sport PS2 ultra high-performance summer tires or Michelin Pilot Sport A/S ultra-high-performance all-season tires sized in 245/45R18. Alternatively, less sport-oriented Michelin Pilot HX MXM4 Grand Touring All Season tires were also available in the same size.

2009 mid-model change (KB2)

For the 2009 model year, the RL received an extensive mid-model change (MMC), and made its introduction at the Chicago Auto Show on February 6, 2008, marketed by Acura as "the most extensive Acura MMC ever". The new sedan was designated KB2 in the VIN codes, differentiating it from the 2005–2008 KB1 chassis VIN code. The revised sedan was released on July 1, 2008, to dealerships. The gasoline engine is upgraded to 3.7 liters with 300 hp. While on paper, the engine may seem to be the same unit as shared with the Acura MDX, it is actually a variant that introduces, for the first time ever on an SOHC Honda V6, an implementation of the Honda VTEC variable valve train technology on both intake and exhaust for improved horsepower and torque. Heretofore, all previous SOHC Honda V6 engines with VTEC used the technology on the intake side only.[23] Engine emissions were reduced to meet the stricter U.S. Environmental Protection Agency (EPA) TIER 2 – BIN 5 and California Air Resources Board ULEV-2 standards. Implementation of the SH-AWD was adjusted for earlier intervention and a greater rear-wheel bias for better handling dynamics.

The MMC RL suspension was upgraded with higher-rate coil springs, larger diameter anti-sway bars and stiffer bushings all around.[24] The MMC RL was equipped with a new larger front anti-sway bar of hollow construction, 30mm diameter overall with a 6.5mm wall thickness, and a larger rear solid anti-sway bar, 19mm in diameter.

2011 update

The 2011 Acura RL added new color combinations, an all new six-speed automatic transmission, power folding mirrors, and rear backup/parking sensors.

The six-speed automatic transmission, first introduced on the 2010 Acura ZDX, finally replaced the RL's five-speed automatic, long criticized by the press as outdated.[34] The transmission upgrade was credited for an EPA gas mileage improvement to 17 mpgUS city, 24 mpgUS highway, and 20 mpgUS combined, an increase of 2 miles per U.S. gallon in highway driving.[35] In addition, 0-60 times were said to decrease by 0.5 seconds, to 6.0 seconds. There have been reports that the 2009 Acura RL Mid Model Change was originally the introduction candidate for the six-speed feature within the Acura lineup, but that the transmission was still undergoing testing and was not yet ready at that time.

Power folding mirrors had been available in markets other than North America since the 2004 introduction in Japan. Parking/backup sensors had been available in the North American market as a dealer installed option since the second generation Acura RL's introduction in late 2004. A host of other features had also been available since the car's introduction in late 2004, some of which are detailed in the Safety section below.

The RL exterior was updated for 2011 with a toned-down version of the controversial "power plenum" front grille. Inside, the RL offered a new interior color (Sea Coast), new Dark Burlwood interior trim, and thin-thread stitching on the steering wheel.

2012

The 2012 Acura RL appears to be a carryover from the 2011 refresh with no substantive changes.[37] The color Platinum Frost Metallic had been dropped in 2011, but appears to be added back in 2012.[38]

Reception

The second-generation 2005 Acura RL appeared on Car and Driver's Ten Best list for 2005. The car also garnered a CNET.com "Editor's Choice" Award for Top Tech Car and has had been reviewed in 2005, 2006, 2007, 2009, and 2011 as well as 2013 for its successor, the RLX. The SH-AWD all-wheel-drive system was lauded by Popular Science as one of the best automotive innovations of 2004, and earned the 2005 "Tech Car of the Year" from CNET.com.[39] In a comparison of 2006–2007 model year mid-luxury sedans with all-wheel drive (prices ranging from $60,000 to 65,000 CAD), the RL compared favorably to a Mercedes-Benz E300 4MATIC and a BMW 528xi with xDrive.[40][41] Subsequent moves by both Audi and BMW to design and market their own versions of torque vectoring all-wheel-drive systems bear out the innovative nature of the SH-AWD design.

While critically acclaimed, sales did not meet expectations. Despite the mid-generational update in 2009, only 2,043 cars were sold in the U.S., a 55 percent drop from 2008. Among Japanese luxury flagships marketed in America during the first six months of 2010, Acura sold only 872 RLs, compared to 5,650

Safety

In October 2010, the Acura RL was named by Consumer Reports [56] as the most reliable new car among luxury sedans, one of five Honda models so honored in their respective categories. The others were the front-wheel-drive version of the Acura TL among upscale sedans, the Honda CR-V small SUV, the Acura RDX small upscale SUV, and the Honda Ridgeline compact pickup truck.

From 2005 to 2008, Acura RL has been ranked #1 and has achieved the best car safety score (46.4) in Informed for LIFE's "2003–2009 Vehicle risk index SCOREs".[57] For both the 2009 and 2010 model years, the Acura RL received a five-star crash safety ratings from the National Highway Traffic Safety Administration (NHTSA).[58][59] For the 2009 model year, the Acura RL received a Top Safety Pick designation from the Insurance Institute for Highway Safety (IIHS) earning a "Good" — the highest score possible — on frontal offset, side impact and rear crash protection tests. The "Good" scores continued for all tests conducted on the 2010 model.[60]

Michelin PAX System

From 2006 through 2008, Michelin PAX System run-flat tires were also offered as an option. This system allowed the car to run up to 125 mi at 50 mi/h with a flat.

Michelin PAX System run-flat tires require special equipment to replace them. Such equipment is available only at a limited number of specially certified tire and car dealerships. In April 2008, Michelin announced that it would discontinue its PAX run-flat tires.[65] Unless special equipment is available, the Acura RL's optional run-flat tires are usually fixed by replacing the entire wheel/tire assembly. Unlike Honda dealers, Acura dealers were not required to become PAX certified service centers, which included expensive training and specialized machinery. Acura dealers would generally take a flat tire/wheel assembly off and put a new PAX System on the vehicle, or refer the customer to the nearest PAX certified facility.

For warranty and safety reasons, it is not recommended that owners of PAX equipped vehicles switch to another type of tire assembly.[66] Both Acura and Michelin have not been forthcoming about how current owners of PAX equipped Acura RLs can address this impasse once the current supply of PAX tires run out. Some hope that the PAX tire supply will not run out and that they will be continued to be produced on a specialty basis, just as the ill-fated Michelin TRX system tires are still produced today.

Recalls

There have been two recalls on the second-generation Acura RL, based on defects in parts used in both Acura and Honda vehicles.

In December 2007, certain 2005–2008 model Acura RLs were subject to a safety recall for the power steering hose.[68] Prolonged high under-hood temperatures may cause the power steering hose to deteriorate prematurely and may cause the hose to crack and leak power steering oil. Oil leaking onto a hot catalytic converter will generate smoke and possibly lead to an under-hood fire. Affected vehicles were to be inspected and repaired, as applicable, at no charge. Reportedly, this recall extended to both 2005–2008 Acura RL and 2004–2008 Acura TL models.

In December 2010, certain 2005–2007 model Acura RLs were subject to a safety recall for potential leaking of the brake master cylinder seal.[69] A seal in the brake master cylinder may be susceptible to damage following the use of brake fluid other than the recommended Acura or (Honda) Genuine DOT3 brake fluid. If the seal is damaged, it can result in a brake fluid leak under certain conditions. If a leak should occur, the driver might see a low brake fluid indicator light or a BRAKE FLUID LOW or CHECK BRAKE SYSTEM message. If the driver continues to drive the vehicle after receiving this message without refilling the brake fluid reservoir, it could result in a brake pedal that feels soft or spongy, and may eventually affect braking performance, increasing the risk of a crash. Affected vehicles were to be inspected and repaired, as applicable, at no charge.

The Acura RL consistently garnered National Highway Traffic Safety Administration (NHTSA) Five Star (the highest rating) ratings for Frontal, Side and Rollover crash testing. The injury measures on the driver in the front test were some of the lowest ever recorded in a NHTSA test at the time, and were still considered top notch as of 2010.
The Acura RL consistently earned a green G for "Good" (the highest rating) in Frontal Offset and Side Impact tests conducted by the Insurance Institute for Highway Safety (IIHS).
The facelifted 2009 Acura RL has revised head restraints, thus improving the rear crash protection rating for the 2005–2008 models from Marginal to Good for the 2009, and earning it recognition as an IIHS Top Safety Pick.
The Acura RL incorporated most modern, and some unique, safety features including:
Advanced Compatibility Engineering (ACE) body structure - ACE features extensive use of high-tensile steel and lightweight aluminum components in a front-mounted polygonal main frame, designed to engage vehicles of differing size and weight in a frontal collision and spread the forces through multiple structural pathways, while preventing or minimizing cabin deformation. The Acura RL was the launch vehicle for the ACE body structure. In 2009, all production Acura vehicles featured the ACE body structure. The ACE body structure is one factor in Acura achieving an all time first in US automotive history, winning simultaneous top marks in both Government National Highway Traffic Safety Administration (NHTSA) and Insurance Institute for Highway Safety (IIHS) crash test ratings[62]
Super Handling-All Wheel Drive (SH-AWD) - In addition to its performance benefits, the front to rear and side to side torque distribution of SH-AWD works actively to keep the car on the desired line
Anti-lock Braking System - 3-channel ABS
Vehicle Stability Assist (Honda Acura version of Vehicle Stability Control) - 4 channel VSA integrated with SH-AWD, ABS, yaw, lateral G, speed and steering angle sensors
Electronic Traction Control (uses individual wheel ABS sensor and engine modulation)
Electronic Brake-force Distribution (EBD) (redistributes front and rear brake pressures as the situation dictates)
Brake Assist - "learns" the driver's braking habits, rate of pressure and total pressure applied, then quickly activates full ABS in a perceived panic stop
Front Air Bags (2 ea) - including two-stage activation which minimizes injury due to deployment geometry (deploying upward rather than forward into the occupant) and speed[63]
Front Side Air Bags (2 ea) - including Occupant Position Detection System (OPDS)
Side Curtain Air Bags (2 ea) - for front and rear passengers
Occupant Position Detection Sensor (OPDS) system - detects weight and positioning of passenger in the front seat and disables the passenger front side air bag deployment if the system calculates that deployment could cause injury to the occupant, such as a child or small-statured adult[63]
LATCH child seat anchors
Tire Pressure Monitoring System (TPMS]) - provides individual pressure readings for each tire and tire position in a graphical display, and alerts the driver in the event of low or no pressure
5 mi/h bumpers front and back
Optional Collision Mitigation Braking System (CMBS) (2006-forward)
Optional Adaptive Cruise Control (ACC) (2006-forward)
Optional Michelin PAX System run-flat tires (2006–2008)