Bonneville V6-3.8L VIN K (1996)
Heads Up Display Unit: Technical Service Bulletins
Instruments - Heads-up Display & Cluster Differ
File In Section: 8 Chassis/Body Electrical
Bulletin No.: 10-81-50A
Date: December, 1996
Subject:
Heads-up Display (UV6) And Instrument Cluster Speed Differences (Diagnosis And Repair)
Models:
1992-97 Pontiac Bonneville SSEi and SSE with HUD Option (UV6)
This bulletin is being revised to add the 1996-97 model years and to specify model years for "Canadian Vehicles Only". Please discard Corporate
Bulletin Number 10-81-50 (Section 8 - Chassis/Body Electrical).
Condition
Some vehicles may display a condition at 70 mph where the speedometer reads about 4 mph faster or slower than the HUD. This is not an intermittent
type condition. Repairs should not be attempted if the speed difference at 70 mph is within 3 mph.
Cause
Variation in the placement of the speedometer pointer can cause this condition.
Correction
If the above condition is confirmed through proper diagnosis, the cluster must be repaired by an authorized Delco repair center.
Diagnosis and repair:
1.
Install a Tech I, select the proper engine type, and select vehicle speed.
2.
Drive the vehicle and increase speed until the HUD registers 65 mph (use 100 km/h for metric clusters).
a.
If the cluster speedometer registers between 62 mph and 68 mph, do not attempt any repairs (95 to 105 km/h for metric units). The accuracy
is within allowable limits.
b.
If the cluster speedometer registers below 62 mph (95 km/h metric) or above 68 mph (105 km/h metric), verify that the correct HUD module
is installed in the vehicle (the part number is on a label either on the top or bottom of the unit). Install a new HUD module if the wrong part
was used. If the correct HUD was used, replace the component that shows the greatest speed error when compared to the Tech
Important:
The Tech I speed value may not exactly match either HUD or cluster because of different processing techniques in the PCM.
CANADIAN VEHICLES ONLY
Condition
Owners of some 1992-93 Canadian Pontiac Bonnevilles with the UV6 option (std SSEI/opt SSE) may experience a condition where the Heads Up
Display (HUD) registers a speed which is much greater than the speed registered on the instrument cluster (more than 5 km/h at 100 km/h).
Cause
Export HUD's were installed on some Canadian vehicles. Export HUD part number 16156442.
Correction
Install the domestic HUD identified as part number 16134822. Call the local AC Delco Service Center to receive an exchange unit.
