For 1990-2009 cars

# SMU - SECTION 8A - REVISIONS TO ELECTRICAL DIAGNOSIS

#### SUBJECT: SERVICE MANUAL UPDATE - SECTION 8A - REVISIONS TO ELECTRICAL DIAGNOSIS FOR THE VOLTS INDICATOR

#### MODELS: 1995 BUICK LESABRE, PARK AVENUE 1995 OLDSMOBILE EIGHTY EIGHT, NINETY EIGHT

THIS BULLETIN CONTAINS REVISIONS TO SECTION 8A-80 TO COVER ELECTRICAL DIAGNOSIS FOR THE ABOVE VEHICLES WITH INDICATORS CLUSTER. THE PRIMARY PURPOSE OF THIS BULLETIN IS TO CLARIFY THE PROPER DIAGNOSIS FOR THE VOLTS INDICATOR. THE APPROPRIATE DIAGNOSIS FOR THE VOLTS INDICATOR IS CONTAINED IN EITHER CHART #4 OR CHART #5 IN SECTION 8A-30. HOWEVER, THESE CHARTS REFER BACK TO 8A-80 IF EVERYTHING CHECKS OUT OKAY IN THE TESTS. THEREFORE, THE SYMPTOM TABLE IN SECTION 8A-80 HAS BEEN UPDATED TO INDICATE THAT IF THE TESTS IN THE APPROPRIATE CHART FROM SECTION 8A-30 ARE PERFORMED SUCCESSFULLY, THEN THERE IS A PROBLEM WITH THE CLUSTER AND IT MUST BE REPLACED.

CHART C ON PAGE 8A-80-19 HAS BEEN UPDATED TO CYCLE THE IGNITION SWITCH WHEN USING THE J33431 I/P TESTER TO SIMULATE THE FUEL SENDER RESISTANCE TO DRIVE THE GAGE. THE OLDSMOBILE INDICATORS CLUSTER (U2E) USES A FUEL ANTISLOSH CIRCUIT WHICH NEEDS TO BE RESET IN ORDER TO GET AN IMMEDIATE READ OF THE GAGE. THIS FUEL ANTISLOSH CIRCUIT IS RESET BY CYCLING THE IGNITION SWITCH FROM "OFF" TO "RUN".

THE FOLLOWING PAGES ARE REVISIONS TO THE APPROPRIATE SERVICE MANUALS:

8A-80-16 REVISION 8A-80-17 REVISION 8A-80-19 REVISION

FIGURES: 0 ATTACHMENTS: 3

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.

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