SERVICE MANUAL UPDATE SEC. 8A- ELECTRICAL DIAGNOSIS

VEHICLES AFFECTED: 1989 "N" CAR

The following pages reflect product changes. These pages are contained herein:

8A-1-0 INDEX

8A-1-1 INDEX

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

8A-14-6 Change the 2 BLK/WHT wire between the Door Lock Relay Assembly, terminal D, and splice S305 to .5 BLK/WHT.

8A-20-2 Change the .5 BLK/WHT wire from splice S129 to .8 BLK/WHT.

8A-20-4 Change the .8 BLK/ORN wire from the Manifold Air Temperature (MAT) Sensor to .8 BLK/YEL.

8A-23-6 Change the .5 BLK wire from the Throttle Position Sensor (TPS), terminal B, to .8 BLK.

8A-67-1 Change the .5 DK BLU wire from the Engine Control Module ECM, terminal 2 of connector C2, to .8 DK BLU.

8A-67-1 Change the .5 DK GRN/WHT wire from the A/C Compressor Control Relay, terminal 2, to .8 DK GRN/WHT.

8A-114-0 Change the terminals on the Dome Light from B to A and from A to B.

8A-114-1 See Update Change for page 8A-114-0.

8A-114-3 Change the .8 BLK/ORN (40) wire from connector C102 to .8 DK BLU (909).

8A-114-3 New Ground G109 - Add a .8 BLK (150) wire from the Underhood Light to ground G109.

8A-130-0 See Update Change for page 8A-14-6.

8A-134-0 Change the .8 BLK/PNK wire from the Luggage Compartment Lid Release Solenoid to 2 BLK/PNK.

8A-140-0 Change direction of connector C306.

8A-151-0 Change the BLK (900) wire from the capacitor to BLK (899).

Chassis Service Page/Revision Manual Page and Category Air Conditioning Air Delivery Electronic............................... 68-0 Blower Controls Electronic. ............................. 66-0 Compressor Controls Electronic................................67-0 ...............67-1 3 System Check .............................. 62-0 Alarms (Audible) Antenna (Power)............................. 151-0 ............. 151-0 3 Chime.....................................76-0 Automatic Safety Belts ......................146-0 Brakes Warning System ....................... 41-0 Charging System ............................. 30-1 Cigar Lighter.. ............................ 114-3 Circuit Breaker Details .............. 10-0, 11-0 Clock (Digital)............................ 150-0 Component Location Views ....................201-0 Connectors (Harness Connector Faces).........202-0 Coolant Fan.................................. 31-0 Cruise Control............................... 34-0 Defogger (Rear).............................. 61-0 Digital Clock................................150-0 Door Locks (Power) ......................... 130-0 ............ 130-0 3 Engine Control Electronic Fuel Injection (VIN U)........ 20-0 ....... 20-2 3, 20-4 3 Multi-Port Fuel Injection (VIN N)........ 21-0 Multi-Port Fuel Injection (VIN D)........ 23-0 ............. 23-6 3 Fuel Gage Indicators Cluster ...................... 80-0 Fuse Block Details........................... 11-0 Fuse Details............................ 10-0 11-0 Fusible link Details .........................10-0 Gages Indicators Cluster ...................... 80-0 Fuel...................................80-0 Speedometer............................80-2 Ground Distribution ......................... 14-0 ............. 14-6 3 Harness Routing Views .......................203-0

Chassis Service Page/Revision Manual Page and Category Heater......................................... 40-0 Horns.......................................... 40-0 Indicators Digital Cluster.............................. 82-0 Standard Cluster ............................ 80-0 Brake.......................................80-0 Coolant Temperature ........................80-1 Cruise .....................................80-1 Fasten Belts .............................. 80-2 Hi Beam.................................... 80-2 LH Turn ................................... 80-2 Low Coolant ............................... 80-0 Oil Pressure ...............................80-1 RH Turn ................................... 80-2 Service Engine Soon ....................... 80-0 Volts ..................................... 80-0 Instrument Panel Digital Cluster............................ 82-0 Standard Cluster............................80-0 Interior Lights Dimming........................117-0 Introduction.................................... 2-0 Lights (Exterior) Back Up................................... 112-0 Front Marker ..............................110-0 Front Park ................................110-0 Hazard.....................................110-0 Headlights ................................100-0 High Level Stop .......................... 110-0 License....................................110-2 Park...................................... 110-0 Rear Marker .............................. 110-2 Stop ..................................... 110-0 Tail...................................... 110-2 Turn ..................................... 110-0 Lights (Interior) Ashtray .................................. 117-1 Console Shift .............................114-3 Courtesy...................................114-1 Dome.......................................114-0 ...... 114-0 3, 114-1 3

Chassis Service Page/Revision Manual Page and Category Headlight Switch Assembly......... ........117-1 Heater and A/C Control Assembly............117-1 Instrument Cluster........................ 117-1 I/P Compartment............................114-1 Luggage Compartment........................114-0 PRNDL Illumination.........................117-1 Radio......................................117-1 Underhood..................................114-3 ...........114-3 3 Vanity Mirror..............................114-0 Wiper Switch Assembly .....................117-1 Light Switch Details .......................... 12-0 Luggage Compartment Lid Release................134-0 Power Antenna..................................151-0 ...........151-0 3 Power Distribution..............................10-0 Power Door Locks...............................130-0 ...........130-0 3 Power Seats ...................................140-0 ...........140-0 3 Power Windows .................................120-0 Radio..........................................150-0 Safety Belts (Automatic) ......................146-0 Speedometer Gage Gages Cluster................................81-2 Standard Cluster.............................80-0 Starter .........................................30-0 Tachometer ......................................81-3 Vehicle Speed Sensor............................ 33-0 Voltmeter ...................................... 81-1 Warnings (Audible) Chime....................................... 76-0 Windows (Power).................................120-0 Wiper/Washer With Pulse.................................. 91-0 Without Pulse .............................. 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.