2003 Chevrolet Trailblazer lights problems

What is wrong

On certain trucks and sport utility vehicles, the driver wishing to signal a turn by moving the directional signal lever, (up or down) may cause the front marker/turn lights and rear turn lights to flash in a manner similar to hazard warning, rather than flashing on the desired side only.

Risk

The driver may not be able to clearly signal their intentions to turn, change travel lanes, or potentially warn others of an impaired vehicle operating condition increasing the risk of a crash.

Remedy

Dealers will replace the suspect flasher modules with a new flasher module designed with sealed relays and more durable contact material inside of the relays free of charge. The recall began on august 4, 2005. Isuzu began mailing owner letters on august 4, 2005. Owners may contact chevrolet at 1‑800‑630‑2438, gmc at 1‑866‑996‑9463, isuzu at 1‑800‑255‑6727, buick at 1‑866‑608‑8080, and oldsmobile at 1‑800‑630‑6537.

Recall number 05V198000 · Recall details

What is wrong

On certain sport utility vehicles, vibration and heat may cause the tail lamp/stop lamp bulb to loosen in its socket. If this occurs, the bulb may flicker and eventually become inoperative.

Risk

An inoperative brake lamp will not convey the driver's intention of stopping to drivers in following vehicles, and an inoperative rear turn signal lamp will not convey the driver's intention to turn to drivers in following vehicles. Both of these failures can increase the risk of a crash.

Remedy

Dealers will inspect the tail lamp/stop lamp assemblies, and if necessary, replace them. The recall began on november 22, 2004. Owners should contact chevrolet at 1‑800‑630‑2438, oldsmobile at 1‑800‑630‑6537, buick at 1‑866‑608‑8080, or gmc at 1‑866‑996‑9463.

Recall number 04V527000 · Recall details

The subject vehicles are model year (MY) 2002-2009 Chevrolet Trailblazer, GMC Envoy, 2004-2007 Buick Rainier, 2003-2008 Isuzu Ascender, 2005-2009 Saab 9-7X, 2002-2004 Oldsmobile Bravada, 2003-2006 Chevrolet SSR, 2005-2009 Buick Lacrosse, and 2006-2008 Pontiac Grand Prix. This scope includes the Trailblazer/Envoy variants: 2002-2006 Envoy XL/Trailblazer EXT and 2004-2005 Envoy XUV. The original scope of this investigation was expanded to include all vehicles equipped with the subject Headlight Driver Module (HDM). The focus of the investigation was to determine whether actions performed by General Motors adequately addressed any unreasonable risk to motor vehicle safety in the subject vehicles concerning the headlights and the HDM that controls them.Under normal electrical load and environmental conditions, the HDM can overheat inside the Underhood Electrical Center (UEC). This can cause the module to fail and result in a simultaneous loss of both low beam headlights and both daytime running lights (DRLs), often with no warning or prior detectability to the driver. This failure can be intermittent or permanent. No other exterior lights are affected. High beams, turn signals, brake lights, and reverse lights are still operational.General Motors addressed this issue with 2 recalls (14V755 & 15V519) and a special coverage program (N172091910). In view of the recalls and special coverage program implemented by GM and the vehicle high beams continuing to operate, ODI has tentatively concluded that the actions taken by GM mitigate any unreasonable risk to safety posed by HDM failure in the subject vehicles.Accordingly, the investigation is closed. The closing of this investigation does not constitute a finding by the federal safety agency that a safety-related defect does not exist. The agency reserves the right to take additional action if warranted by new circumstances.The ODI reports cited above are available for review online at under the identification numbers in the attached document.

RQ17002

Gm states that some brake/tail lamp bulbs can prematurely become inoperative due to malfunctioning brake/tail lamp sockets.on march 2, 2004, gm initiated a 6-year/72,000 mile special policy for 989,487 subject vehicles to inspect and replace the rear brake/tail lamp bulb socket assemblies.on april 4, 2004, the office of defects investigation (odi) opened a preliminary evaluation (pe04-032) based on consumer complaints alleging brake lights not operating when the brake pedal is depressed.on august 3, 2004 odi upgraded pe04-032 to an engineering analysis (ea04-021).by letter dated october 27, 2004 gm notified the federal safety agency that it will conduct a safety recall (the federal safety agency # 04v527) covering subject vehicles that were not already repaired under gm's special policy.my 2004 subject vehicles built after august 8, 2003 contain improved brake lamp assemblies and are not included in the recall.gm dealers will install the improved brake lamp assembly on subject vehicles built on august 8, 2003 and earlier.the action taken by gm is sufficient to resolve the issues raised by this investigation.accordingly, this investigation is closed.

EA04021

The office of defects investigation (odi) opened this investigation on model year (my) 2002-04 chevrolet trailblazer vehicles.gm reports that other vehicles sharing this platform and brake lamp design are the my 2002-2004 chevrolet trailblazer ext; gmc envoy, xl, xuv; oldsmobile bravada and 2004 buick rainier.complaints allege that the rear brake lamp does not operate when the brake pedal is depressed.there is no indication to the driver from inside the vehicle that one or more brake lamps bulbs are not functioning.gm found that heat from the bulb could deform the lamp socket, produce electrical arcing and an inoperative bulb.to correct the condition, gm changed the bulb to a bulb that transmits less heat to the socket and changed the socket to a thermoplastic polymer to improve thermal stability.these changes were implemented into production vehicles on october 1, 2003.gm implemented a special policy by notifying consumers that if they should experience a brake lamp failure to go to their gm dealership to have the circuit board containing the brake lamp replaced along with new bulbs.this policy is good for the first 6 years or 72,000 miles of the life of the vehicle.odi will upgrade this investigation to ea 04-021 and include the above mentioned vehicles.

PE04032