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NHTSA ID Number: 10115046
Manufacturer Communication Number: PIT5374B
Summary
This Preliminary Information communication provides information to the technician about vehicles with poor headlight performance when driving in very dark rural areas. Technician should perform normal diagnostics first. If no issue found or the customer is still has complaint the Body Control Module for vehicles built before 12/23/14 at Flint Assembly (11th Vehicle Identification Number Digit “F”), 1/13/15 at Silao Assembly (11th Vehicle Identification Number Digit “G”) or 1/16/15 at Ft. Wayne Assembly (11th Vehicle Identification Number Digit “Z”). Technician should replace both headlights with part number 23342527. After the headlights are replaced a headlamp aiming procedure should be performed.
3 Affected Products
Vehicles
MAKE | MODEL | YEAR |
GMC | SIERRA 1500 | 2014 |
GMC | SIERRA 2500 | 2015 |
GMC | SIERRA DENALI | 2015 |
Condition/Concern
Some customers may comment of poor headlight performance when driving in very dark rural areas. While the headlights meet all FMVSS (Federal Motor Vehicle Safety Standard) requirements and CMVSS (Canada Motor Vehicle Safety Standard) requirements, customers may request better headlight performance for these very dark rural areas.
Parts
Part Number | Description | Qty |
23342527 | Headlight Bulb | 2 |
1 Associated Document
Manufacturer Communications
Bulletin No.: PIT5374B
Date: Jun-2015
https://www.nhtsa.gov/recalls?nhtsaId=10115046
NHTSA ID Number: 10057993
Manufacturer Communication Number: PIT5374A
Summary
GENERAL MOTORS 2014-2015 GMC SIERRA, GMC SIERRA 1500: SOME VEHICLES ARE EXPERIENCING POOR HEADLIGHT PERFORMANCE WHEN DRIVING IN RURAL DARK AREAS. *LJ UPDATED 1/22/16. *PE
2 Associated Documents
Service Bulletin Document
Bulletin No.: PIT5374B
Date: June, 2015
https://www.nhtsa.gov/recalls?nhtsaId=10057993
SB-10057993-1044.pdf 203.415KB
Service Bulletin Document
Bulletin No.: PIT5374A
Date: March, 2015
https://www.nhtsa.gov/recalls?nhtsaId=10057993
NHTSA ID Number: 10139329
Manufacturer Communication Number: PIT5374A
Summary
This Preliminary Information communication provides information to the technician about vehicles with poor headlight performance when driving in very dark rural areas. Technician should perform normal diagnostics first. If no issue found or the customer is still has complaint the Body Control Module for vehicles built before 12/23/14 at Flint Assembly (11th Vehicle Identification Number Digit “F”), 1/13/15 at Silao Assembly (11th Vehicle Identification Number Digit “G”) or 1/16/15 at Ft. Wayne Assembly (11th Vehicle Identification Number Digit “Z”). Technician should replace both headlights with part number 23342527. After the headlights are replaced a headlamp aiming procedure should be performed.
1 Associated Document
Manufacturer Communications
Bulletin No.: PIT5374A
Date: Mar-2015
https://www.nhtsa.gov/recalls?nhtsaId=10139329
MC-10139329-9999.pdf 265.291KB
NHTSA ID Number: 10114446
Manufacturer Communication Number: PIT5374
Summary
This Preliminary Information communication provides information to the technician about vehicles with poor headlight performance when driving in very dark rural areas. Technician should perform normal diagnostics first. If no issue found or the customer is still has complaint the Body Control Module for vehicles built before 12/23/14 at Flint Assembly (11th Vehicle Identification Number Digit “F”), 1/13/15 at Silao Assembly (11th Vehicle Identification Number Digit “G”) or 1/16/15 at Ft. Wayne Assembly (11th Vehicle Identification Number Digit “Z”). Technician should replace both headlights with part number 23342527. After the headlights are replaced a headlamp aiming procedure should be performed.
1 Associated Document
Manufacturer Communications
Bulletin No.: PIT5374
Date: Feb-2015
https://www.nhtsa.gov/recalls?nhtsaId=10114446
MC-10114446-9999.pdf 251.116KB
NHTSA ID Number: 10057992
Manufacturer Communication Number: PIT5374
Summary
GENERAL MOTORS 2014-2015 GMC SIERRA, GMC SIERRA 1500: INFORMATION REGARDING POOR HEADLIGHT PERFORMANCE WHEN DRIVING IN VERY DARK RURAL AREAS. *LJ
1 Associated Document
Service Bulletin Document
Bulletin No.: PIT5374
Date: March, 2015
https://www.nhtsa.gov/recalls?nhtsaId=10057992
“This site contains affiliate links for which OEMDTC may be compensated” |
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SEOCONTENT-START
Bulletin No.: PIT5374B Date: Jun-2015 Subject: Headlight Performance (BCM Calibration and Bulbs) Models: 2015 GMC Sierra 2014 GMC Sierra 1500 This PI was superseded to add a note and diagnostic tips. Please discard PIT5374A. The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI. Condition/Concern Some customers may comment of poor headlight performance when driving in very dark rural areas. While the headlights meet all FMVSS (Federal Motor Vehicle Safety Standard) requirements and CMVSS (Canada Motor Vehicle Safety Standard) requirements, customers may request better headlight performance for these very dark rural areas. Recommendation/Instructions When addressing headlight performance issues, normal diagnostics should be performed first. Verify that all headlights operate, headlight adjustment is correct, and that there is no headlight mounting damage or any issues with the lens itself being damaged/hazy/cloudy/etc. Repair any headlight issues first, and then, if an owner still has a complaint, perform the following repairs: 1. For vehicles built before 12/23/14 at Flint Assembly (11th Vin Digit “F”), 1/13/15 at Silao Assembly (11th Vin Digit “G”) or 1/16/15 at Ft. Wayne Assembly (11th Vin Digit “Z”), reprogram the BCM with the latest calibration available in TIS2WEB starting on 1/12/2015. The new BCM calibration will increase the voltage to the headlight bulbs in both the low beam and high beam selections. All vehicle build after the above dates already have the new BCM calibrations and the BCM reprogramming does NOT need to be done. 2. Replace both headlight bulbs with updated bulb part number 23342527. IMPORTANT: Verify the correct bulb is being installed by confirming the following markings on the bulb: 1 1. 28432 2. HIR2+30 Important: When installing the new headlight bulbs, do not touch the glass and pay close attention that the bulbs are fully seated into the headlight housing. If the bulb is not properly installed it can lead to an incorrect light pattern. A beam pattern photo with a properly installed bulb is shown below. This photo is of a GMC Sierra Low beam pattern (1 Lamp with opposite lamp blocked) on wall/aiming screen at 25 ft (7.62 m). Each block division is approximately 10.5″ (26.67cm) 3. After bulb replacement, perform Headlamp Aiming procedure (see below) Important: The replacement of the bulb along with the calibration change should ONLY be performed at the same time. Doing them as separate service visits may not show the overall desired effect to the customer. Performing these repairs at the same time will show a dramatic improvement. -Headlamp Aiming Procedure Headlamp aiming is done with the low beam lamps. The high beam lamps will be correctly aimed if the low beam lamps are aimed properly. Screen Method for Headlamp Aiming (Visual Aim) The screen method requires an area set up specifically for headlamp aim The area should consist of a level surface large enough to allow for a vehicle and an additional 7.62 m (25 ft) as measured from the face of the headlamps to the aiming screen. The screen should be a wall or other flat surface at least 1.52 m (5 ft) high by 3.66 m (12 ft) wide with a matte white surface well shaded from extraneous light, and 90 degrees to the floor. The screen should have one adjustable horizontal tape. After the aiming screen has been set up and located: 2 1. Position the vehicle directly in front of the screen or wall at a distance of 25 feet. 2. Remove any snow, ice or mud from the vehicle. 3. The vehicle should be fully assembled and all other work stopped while the headlamp aiming is being done. 4. The vehicle should contain cargo or be loaded to represent normal vehicle use. 5. Tires should be properly inflated. 6. Rock the vehicle to stabilize the suspension. 7. Measure from the floor to either headlamp reference mark Note: If the reference mark (small circle) cannot be seen on the headlamp len, measure from the floor up to the center of the headlight projector eye ball. 8. At the screen, measure from the floor and place the horizontal tape at the measured height. This establishes the Horizontal Aiming Line. Note: Floor must be level 1. 25 ft (7.62 m) 2. Height of Horizontal Aiming Line on screen 3. Aiming Screen or Wall 4. Reference mark (small circle) on headlamp lens 9. Turn the headlamps ON. 10. Block the light from projecting onto the screen from the passenger side headlamp. This will allow the cutoff (“top” of the beam pattern) in the beam pattern from the driver’s side to be more pronounced for easier aim verification. Important: DO NOT cover the headlamp, this may cause excessive heat buildup 11. On this vehicle you will be verifying the vertical aim of the cutoff (top of the beam pattern) on the right side of the “step” in the beam pattern. 12. If the vertical location of the cutoff projected onto the screen or wall differs from the figure below, then an adjustment to the beam pattern location is necessary. 3 Note: GMC Sierra Low beam pattern (1 Lamp) on wall/aiming screen at 25 ft (7.62 m) 1. Horizontal Aiming Line 2. Reference line only, Not needed for proper aiming 3. Step in beam pattern 4. Top of beam pattern (cutoff line) positioned at the horizontal aiming line +0 / -0.75″ (-19mm) 13. Adjust the vertical headlamp aim adjustment screw until the cutoff (top of the beam pattern) on the right side of the beam pattern step is set between the Horizontal Aim Line and 0.75 (19mm)inches below. 14. Repeat the aiming procedure for the passenger’s side headlamp while blocking the light from projecting onto the screen from the driver’s side headlamp. Diagnostic Tips for outside ambient temperature showing either dashes “–” or inaccurate, if BCM program was needed: – If the outside temperature will not update and is displaying an inaccurate temperature, example 32° F (0° C), Please reference to the latest version of PIT5232 – Subject: Diagnostic Tip – Outside Temperature Will Not Update. – If the outside temperature is displaying dashes “–” and the truck is an early built 2015i (RPO AVF = 2015i mid year change) equipped with 6.6L diesel engine (RPO LML) built before 12/14/14, Please reference the latest version of PIT5365 – Diagnostic Tips Ambient Temperature Display / Information (Topology). The IPC will also need to be programmed with the latest calibrations available in TIS2WEB, due to a change in the outside temperature topology after the BCM is updated with the latest calibrations in TIS2WEB. Parts Information Part Number Description Qty 23342527 Headlight Bulb 2 Warranty Information For vehicles repaired under warranty use: Labor Operation Description Labor Time 2080428* Replace Both Headlamp Bulbs And Aim Headlamps 0.8 hr Add Reprogram the BCM (Only needed on vehicles built prior to date codes listed in the PI) 0.5 hr Add Instrument Cluster Reprogramming with SPS (With RPO’s UDC, AVF and LML) 0.3 hr Instrument Cluster Reprogramming with SPS and USB (With RPO’s UDD, AVF and LML) Add 0.6 hr * This is an unique labor operation for bulletin use only. This will not be published in the Labor Time Guide. Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.
SEOCONTENT-END
My 2014 GMC Sierra 1500 SLT has terrible headlights. If you set the low beam such that you can see more than 150 feet in front of the vehicle then the high beams are pointing up in the tree tops. There would be early adequate light that the bulb selector relationship is wrong and can’t be adjusted. I installed LED headlights so at least I can see a bit better on low beams. GMC is unable to offer any solution.
These lights on a $55,000.00 vehicle are unsafe – period.
It does not matter how good anything else is, I won’t be buying a fourth GMC Sierra SLT.