HEADS-UP DISPLAY & I/P CLUSTER SPEEDOMETER DIFFER 4 MPH. Pontiac Bonneville 1994

REVISION: 01/05/95

THIS BULLETIN IS BEING REVISED TO ADD ADDITIONAL MODEL YEARS AND UPDATE THE DIAGNOSIS PROCEDURE.

PREVIOUS DIVISIONAL PUBLICATIONS WERE: GM OF CANADA 92-8-129 PONTIAC 92-8-15 ---------------------------------------------------------------------- REVISION: 12/16/96

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). ----------------------------------------------------------------------

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)

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 I.

NOTE: 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 5KM/H AT 100KM/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.

FIGURES: 00 ATTACHMENTS: 00

GENERAL MOTORS BULLETINS ARE INTENDED FOR USE BY PROFESSIONAL TECHNICIANS, NOT A "DO-IT-YOURSELFER". THEY ARE WRITTEN TO INFORM THOSE TECHNICIANS OF CONDITIONS THAT MAY OCCUR ON SOME VEHICLES, OR TO PROVIDE INFORMATION THAT COULD ASSIST IN THE PROPER SERVICE OF A VEHICLE. PROPERLY TRAINED TECHNICIANS HAVE THE EQUIPMENT, TOOLS, SAFETY INSTRUCTIONS AND KNOW-HOW TO DO A JOB PROPERLY AND SAFELY. IF A CONDITION IS DESCRIBED, DO NOT ASSUME THAT THE BULLETIN APPLIES TO YOUR VEHICLE, OR THAT YOUR VEHICLE WILL HAVE THAT CONDITION. SEE A GENERAL MOTORS DEALER SERVICING YOUR BRAND OF GENERAL MOTORS VEHICLE FOR INFORMATION ON WHETHER YOUR VEHICLE MAY BENEFIT FROM THE INFORMATION.