SERVICE MANUAL UPDATE SEC.8A- ELECTRICAL DIAGNOSIS

VEHICLES AFFECTED: 1989 "J" CAR

8A-1-0 INDEX

8A-1-1 INDEX

8A-11-6-A FUSE BLOCK DETAILS: INST LPS Fuse

8A-14-0-A GROUND DISTRIBUTION: G100, G101, G115, AND G200 INSTRUMENT PANEL GROUND

8A-117-1-A INTERIOR LIGHT DIMMING

8A-201-11 COMPONENT LOCATION VIEWS

8A-201-11A COMPONENT LOCATION VIEWS

In addition, the following pages should be revised to reflect minor changes for late production, as noted:

8A-34-0 Change the .5 BRN (986) wire from the Brake Switch to .5 BRN/WHT (379)

8A-34-0 Change the .5 BRN/WHT (986) wire from the Cruise Control Clutch Switch to .5 BRN/WHT (379)

8A-34-0 Change the BRN and BRN/WHT (986) wire in the Check Brake System Test to BRN/WHT (379) wire

8A-34-10 See Update Change for page 8A-34-4

8A-41-0 Delete connector C206 (AUTOMATIC) C270 (MANUAL) from the wire running between splice S232 and the Park Brake Switch. The wire colour and gauge is .8 TAN/WHT.

8A-134-1 Delete connector C270 from the wire running between splice S232 and the Park Brake Switch. The wire colour and gauge is .8 TAN/WHT.

Chassis Service Page/Revision Manual Page and Category Air Conditioning ----------- ------------ Air Delivery Manual...........................65-0 Blower Controls Manual...........................63-0 Compressor Controls Manual...........................64-0 System Check........................62-0 Alarms (Audible) Chime ..............................76-0 Antenna (Power).....................151-0 Brakes Warning System................41-0 ............... 41-0 3 Charging System......................30-0 Circuit Breaker Details........10-1, 11-0 Clock (Digital).....................150-0 Component Location Views ...........201-0 ............ 201-11-A 1 201-11 2 Connectors(Harness Connector Faces) 202-0 Coolant Fan ..................... 31-0 Coolant Temperature Gage.............81-2 Cruise Control.......................34-0 ........ 34-0 3, 34-4 3 34-10 3 Defogger (Rear) .....................61-0 Digital Clock ......................150-0 Door Locks (Power) .................130-0 Engine Control Throttle Body Injection (L4 VIN 1).21-0 Fuse Block Details ................. 11-0 .............. 11-6-A 1 Fuse Details .................10-0,11-0 .............. 11-6-A 1 Fusible Link Details................ 10-0 Gages Gages Cluster......................81-0 Coolant Temperature ............81-2 Fuel .......................... 81-2 Oil Pressure ...................81-2 Tachometer......................81-2 Voltmeter.......................81-2 Standard Cluster.................... 80-0 Fuel..........................80-1

Chassis Service Page/Revision Manual Page and Category

Ground Distribution .......................14.0 ................14.0-A 1 Harness Routing Views.................... 203-0 Heater ................................... 60-0 Horns .................................... 40-0 Gages Cluster ......................... 81-0 Brake.................................81-0 Charge................................81-0 Cruise................................81-0 Fasten Belts .........................81-1 Hi Beam ............................. 81-1 LH Turn.............................. 81-1 RH Turn.............................. 81-1 Service Engine Soon 81-0 Shift ................................81-0 Tailgate Ajar ........................81-0 Standard Cluster ........................80-0 Brake.................................80-0 Charge................................80-0 Cruise................................80-0 Fasten Belts..........................80-1 Hi Beam.............................. 80-1 LH Turn.............................. 80-1 Oil...................................80-0 RH Turn.............................. 80-1 Service Engine Soon.................. 80-0 Shift.................................80-0 Tailgate Ajar ........................80-0 Temp................................. 80-0 Instrument Panel Gages Cluster .......................81-0 Standard Cluster.................... 80-0 Interior Lights Dimming...................117-0 ............... 117-1-A 1 Introduction.............................. 2-0 Lights(Exterior) Back Up ..............................112-0 Fog....................................100-1 Front Marker...........................110-0 Front Park.............................110-0 Hazard.................................110-0 Headlights.............................100-2 Doors .................................102-0 High Level Stop .......................110-3 License...................................110-4 Park...................................110-0 Rear Marker............................110-4 Stop ..................................110-1 Tail.................................. 110-1 Turn ..................................110-0 Lights (Interior) Ashtray................................117-1 ................117-1-A 1 Cargo..................................114-0 Courtesy...............................114-0 Dome...................................114-0 Fiber Optic Light Source ..............117-1 Heater and A/C Control Assembly....... 117-1 Instrument Cluster.................... 117-1 I/P Compartment ...................... 114-1 PRNDL..................................117-1 ................117-1-A 1 Radio .................................114-1 Reading................................114-0 Rear Compartment ......................114-1 Rear Defogger Control .................117-1 Underhood .............................110-0 Light Switch Details ......................12-0 Luggage Compartment Lid Release ..........134-0 ............... 134-1 3 Oil Pressure Gage........................ 81.2 Power Door Locks..........................130-0 Power Windows.............................120-0 Radio.................................... 150-0 Rear Defogger........................... . 61-0 Repair Procedures ..........................5-0 Starter....................................30-0 Symbols.................................... 3-0 Tachometer.................................81-2 Tailgate Release..........................134-1 ............... 134-1 3 Troubleshooting Procedures ................ 4-0 Vehicle Speed Sensor ..................... 33-0 Voltmeter................................. 81-2 Warnings (Audible) Chime................................... 76-0 Windows (Power)...........................120-0 Wiper/Washer With Pulse.............................. 91-0 Standard.................................90-0

KEY 1 Late Production 2 Revised 3 Refer to Update Change Summary on following page

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.