SERVICE MANUAL UPDATE SEC. 8A REVISED SUPPLEMENTAL INFO.
Subject: SERVICE MANUAL UPDATE - SECTION 8A (SUPPLEMENTAL AND REVISED INFORMATION)
Models Affected: 1992 GRAND AM MODELS
Section 8A of the 1992 Grand Am Service Manual is not complete due to insufficient data at the time of publication. The following pages contain updated information and is intended to be used to supplement Section 8A.
1992 PONTIAC GRAND AM SECTION 8A ELECTRICAL DIAGNOSIS SERVICE MANUAL UPDATES
CAUTION
To reduce the chance of personal injury and/or property damage, the following Instructions must be carefully observed:
Proper service and repair are important to the safety of the service technician and the safe, rollable operation of all motor vehicles. If part replacement is necessary, the part must be replaced with one of the same part number or with an equivalent part. Do not use a replacement part of lesser quality. The service procedures recommended and described In this service manual are effective methods of performing service and repair. Some of these procedures require the use of tools specially designed for the purpose.
According, anyone who Intends to use a replacement part, service procedure or tool which Is not recommended by the vehicle manufacturer, must first determine that neither his safety nor the safe operation of the vehicle will be jeopardized by the replacement part, service procedure or tool selected.
It is important to note that this manual contains various "Cautions" and "Notices" that must be carefully observed in order to reduce the risk of personal injury during service or repair, or the possibility that Improper service or repair may damage the vehicle or render It unsafe. It Is also Important to understand that these "Cautions" and "Notices" are not exhaustive, because it is Impossible to warn of all the possible hazardous consequences that might result from failure to follow these instructions.
FOREWORD
This manual provides late production and revised information to supplement Section 8A. Page numbers are the same as those used in the service manual. The introductory pages from pages 8A-1-0 through 8A-5-3 also apply to this supplement.
An understanding of the material contained herein and in monthly issues of Dealer Technical and Management Bulletins, issued when necessary, will assist service personnel on properly maintaining the quality to which Pontiac cars are built.
All information, illustrations and specifications contained in this manual are based on the latest product information available at the time of publication approval. The right is reserved to make changes at any time without notice.
NOTICE: When fasteners are removed, always reinstall them at the same location from which they were removed. If a fastener needs to be replaced, use the correct part number fastener for that application. If the correct part number fastener is not available, a fastener of equal size and strength (or stronger) may be used. Fasteners that are not reused, and those requiring thread locking compound will be called out. The correct torque value must be used when installing fasteners that require it. If the above conditions are not followed, parts or system damage could result.
No part of this publication may be reproduced, stored in any retrieval system or transmitted, in any form by any means, including but not limited to electronic, mechanical, photocopying, recording or otherwise, without the prior written permission of the Pontiac Division of General Motors Corp. This includes all text, illustrations, tables and charts.
LATE PRODUCTION AND REVISED NOTES
The Late Production and Revised notes are used throughout the Section 8A Supplement to identify the type of revision. "Late Production" indicates revisions that occurred throughout the model year. In other words, vehicles were built as indicated on the Late Production page as well as on the page in the respective 1992 Service Manual.
"Revised" also indicates revisions that occurred throughout the model year, but the vehicles were only built as indicated on the Revised page. NOTE: a Revised page supersedes the respective page in the 1992 Service Manual.
INDEX PAGE
The Late Production and Revised pages are indicated in the index by asterisks.
UPDATE CHANGE SUMMARY
The Update Change Summary describes minor revisions to the 1992 Service Manual. Each entry includes the revision page number, the type of revision (Late Production or Revised) and a description of the revision. The zone on the page where the revision should be made is also included.
Each page can be divided into six zones to easily and consistently locate information on Section 8A schematics and text pages. The figure to the right shows the zone locations.
NOTE: It is recommended that you transfer the minor change information in the Update Change Summary to your 1992 service manuals.
SECTION 8A ELECTRICAL DIAGNOSIS GRAND AM SUPPLEMENT
Cell
1 Index 2 Introduction 3 Symbols 4 Troubleshooting Procedures 5 Repair Procedures 10 Power Distribution 11 Fuse Block Details 12 Light Switch Details 14 Ground Distribution 21 Engine: Multi-port Fuel Injection, V6 VIN N 23 Engine: Multi-port Fuel Injection, L4 VIN D, L4 VIN A and L4 VIN 3 30 Starter and Charging System 31 Coolant Fan 32 Engine Vent Heater 33 Vehicle Speed Sensor 34 Cruise Control 40 Horns 41 Brake Warning 44 Antilock Brake 45 Variable Effort Steering 60 Heater 61 Rear Defogger 62 HVAC: System Check 63 HVAC: Blower Controls 64 HVAC: Compressor Controls 65 HVAC: Air Delivery 76 Audible Warnings: Chime 80 Instrument Panel: Base Cluster 81 Instrument Panel: with Gages Cluster 85 Electronic PRNDL 90 Wiper/Washer 91 Wiper/Washer: Pulse 100 Headlights and Fog Lights 102 Headlights: Daytime Running Lights (T61) 110 Exterior Lights 112 Back Up Lights 114 Interior Lights 117 Interior Lights Dimming 120 Power Windows 131 Automatic Door Locks 138 Brake Transaxle Shift Interlock (BTSI) 140 Power Seats 141 Power Mirrors 146 Automatic Seat Belts 150 Radio/ Audio Systems 200 Service Parts Information 201 Component Location Views 202 Harness Connector Faces 203 Harness Routing Views
INDEX Page
Air Conditioning (see HVAC) Antilock Brake 44-0* Audible Warnings: Chime 76-0* Automatic Door Locks 131-0* Automatic Seat Belts 146-0* Back Up Lights 112-0 Brake Transaxle Shift Interlock (BTSI) 138-0 Brake Warning 41-0* Brake (Antilock) 44-0* Charging System 30-2 Cigar Lighter 114-4 Circuit Breaker Details 10-0, 11-0 Clock (Digital) 150-0 Component Location Views 201-0* Coolant Fan 31-0 Coolant Temperature Gage (see Gages) Cruise Control 34-0* Cruise Control Servo 34-0 Daytime Running Lights (T61) 102-0 Defogger (Rear) 61-0* Digital Clock 150-0 Door Locks (Automatic) 131-0* Electronic PRNDL 85-0 Engine Control Multi-Port Fuel Injection (VIN N) 21-0* Multi-Port Fuel Injection (VIN D, VIN A and VIN 3) 23-0 Engine Vent Heater 32-0 Exterior Lights 110-0* Fuel Gage (see Gages) Fuse Block Details 11-0 Fuse Details 10-0, 11-0* Fusible Link Details 10-0* Gages Base Cluster (U2E) 80-0 Coolant Temperature 80-2 Fuel 80-2 Speedometer 80-4 Gages Cluster (UB3) 81-0 Coolant Temperature 81-0 Fuel 81-0 Oil Pressure 81-0 Speedometer 81-3 Tachometer 81-5 Voltmeter 81-0 Ground Distribution 14-0 Harness Connector Views 202-0* Headlights 100-0 Headlights: Daytime Running Lights (T61) 102-0 Heater 60-0* Horns 40-0 HVAC Air Delivery 65-0 Blower Controls 63-0* Compressor Controls 64-0 System Check 62-0 Indicators Base Cluster (U2E) 80-0 Antilock Brake 80-3 Brake 80-1 Charge 80-3 Check Oil 80-2 Cluster Illumination 80-4 Coolant Temperature 80-0 Fasten Belts 80-3 Hi Beam 80-3 LH Turn 80-4 Low Coolant 80-3 Oil Pressure 80-1 RH Turn 80-4 Service Engine Soon 80-0 Shift 80-1 Turn Lights On 80-0 Gages Cluster (UB3) 81-0 Antilock Brake 81-4 Brake 81-3 Charge 81-4 Check Gages 81-1 Check Oil 81-1 Cluster Illumination 81-2 Fasten Belts 81-2 Hi Beam 81-3 LH Turn 81-3 Low Coolant 81-5 RH Turn 81-3 Service Engine Soon 81-3 Shift 81-4 Turn Lights On 81-2 Instrument Panel Base Cluster (U2E) 80-0 Gages Cluster (UB3) 81-0 Interior Lights 114-0* Interior Lights Dimming 117-0 Lights (Exterior) Back Up 112-0 Daytime Running (T61) 102-0 Fog 100-1 Hazard 110-0* Headlights 100-0 Headlights: Daytime Running Lights (T61) 102-0 High Level Stop 110-1 License 110-2 Marker (Front) 110-0* Marker (Rear Side) 110-2 Park (Front) 110-0* Stop-Turn (Rear) 110-1 Tail 110-2 Turn (Front) 110-0* Lights (Interior) Ashtray 117-1 Convenience Center 117-1 Courtesy 114-1 Header Courtesy 114-3 Header Courtesy/Reading 114-2 Heater-A/C and Rear Defogger Control Assembly 117-1 Illuminated Entry 114-0 Instrument Cluster 117-1 I/P Compartment 114-4 Lights Dimming 117-0 Luggage Compartment 114-1 PRNDL 117-1 Quarter Courtesy 114-3 Quarter Courtesy/Reading (Rear) 114-2 Radio 117-1 Light Switch Details 12-0 Mirrors (Power) 141-0* Oil Pressure Gage (see Gages) Power Distribution 10-0* Power Mirrors 141-0* Power Seats 140-0 Power Windows 120-0 Radio/Audio Systems 150-0* Rear Defogger 61-0 Seat Belts (Automatic) 146-0* Seats (Power) 140-0 Speedometer (see Gages) Starter 30-0* Starter and Charging System 30-0* Tachometer (see Gages) Vehicle Speed Sensor 33-0 Variable Effort Steering 45-0 Voltmeter (see Gages) Warnings (Audible) Chime 76-0* Windows (Power) 120-0 Wiper/Washer Base 90-0 Pulse (CD4) 91-0
UPDATE CHANGE SUMMARY
For details on how to use this cell, refer to the Introduction page.
Page Zone Revision Category Revision ---- ---- ----------------- -------- 8A-10-1 C Late Production Change the label on Fusible Link G from 'RED' to 'RUST'.
8A-21-0 E Late Production Change the label on Fusible Link G from 'RED' to 'RUST'.
F Change the '.8 PNK/BLK (639)' wire between the Fuse Block and conn C207 to '.8 PNK/BLK (239)'.
8A-30-0 A Late Production Delete the ground strap.
C Transpose the term labels of the Transaxle Position Switch (Change 'E' to 'G' and 'G' to 'E').
8A-30-1 C Late Production Transpose the term labels of the Transaxle Position Switch (Change 'E' to 'G' and 'G' to 'E').
8A-30-7 A Late Production In the third box down on the left, change the first sentence to read: 'Connect fused jumper across Transaxle Position Switch TERMS 'G' (YEL) and "E" (PPL). . .'
C In the second box down on the left, change the third sentence to read: 'Measure voltage between Transaxle Position Switch connector term "G" (YEL) and ground (Automatic Transaxle).'
8A-34-5 E Revised Change the second sentence of the first box to 'Check for shorts to voltage in CKT 397 (GRY), CKT 84 (DK BLU) and CKT 87 (GRY/BLK).'
8A-34-10 E Revised Change the third statement in the first box to read: 'Jumper terms 'A' and "E" of Cruise Control Servo to battery voltage.'
8A-41-0 A,B Revised Change the qualifiers on the Brake Fluid Level Switch TERMS from '(L4 VIN 3)' to '(L4 VIN 3, L4 VIN D, L4 VIN A)'.
8A-41-2 B Revised In the second box from the bottom on the right, change the second sentence to read:
'Disconnect Ignition Switch conn C1 and conn C2.'
Change the third sentence In the same box to read: 'is there continuity between Ignition Switch half of conn C1 term 'D' and C2 term 'F'?'
Delete the second sentence In the second box down on the left.
8A-44-0 E Late Production Change the label on Fusible Link G from 'RED' to 'RUST'.
8A-60-1 A,B Revised Change the Blower Motor/Blower Switch positions as follows
"Hi" to "HIGH" "LO" to "LOW"
Remove the quotation marks from "MI" and "M2".
Change Troubleshooting Hint 4 to read: 'If the Blower Motor runs with the Ignition Switch in "RUN' and the Mode Selector "OFF", replace the Mode Selector.
Change Troubleshooting Hint 5 to read: 'Replace the Mode Selector If the Blower Motor runs with the Ignition Switch in 'RUN" and the Mode Selector in one but not all of the following modes: "VENT", "BI-LEV", "HEAT", "BLEND" and Def.
8A-61-2 C Revised In the second SYMPTOM, change'.. does comes on.... 'to does not comes on.'
8A-63-1 A,B Revised Change the Blower Motor/Blower Switch positions as follows
"Hi" to "HIGH" "LO" to "LOW"
Remove the quotation marks from "M1" and "M2".
D Change Troubleshooting Hint 4 to read: 'if the Blower Motor runs with the Ignition Switch in "RUN' and the Mode Selector "OFF", replace the Mode Selector.
Change Troubleshooting Hint 5 to read: 'Replace the Mode Selector if the Blower Motor runs with the Ignition Switch In "RUN" and the Mode Selector in one but not all of the following modes: "VENT", "BI-LEV", "HEAT", "BLEND" and Def.
8A-76-3 C,D,F Revised Under 'Normal Results' in stop [1], change '70 to 75 seconds' to '60 to 90 seconds'.
Under 'Normal Results' In step [3], change '6 times' to '6 to 9 times' and change 'every 3 seconds' to 'every 3 to 4 seconds'.
Under 'Action' In steps [5] and [7], change 'Light Switch' to 'Headlight Switch'.
Add step [8]: ACTION: 'Set Turn Signal Switch for a turn.' NORMAL RESULTS: 'After 3/4 mile of travel, a chime sounds with the flashing of the turn signal.'
8A-76-4 E,F Revised Delete the first SYMPTOM and PROCEDURE at the top of the page.
Change the PROCEDURE for the third SYMPTOM (Key-in-ignition chime continues to sound ... ) to read: 'Check for poor connection at Convenience Center term "G" or open in CKT 39. If OK, replace Multi-function Alarm Module.'
Add another symptom to the SYMPTOM TABLE: SYMPTOM: 'Turn-signal-on-warning does not operate properly.' PROCEDURE: 'Check CKT 16 and CKT 389 for an open. If OK, replace Multi- function Alarm Module.'
8A-76-6 A Revised In Chart #4, change the bottom left-hand box to read: 'if Fasten Belts Indicator Is still lit, check CKT 237 for a short to Battery. If not, check for an open or short to Battery in CKT 528.'
In Chart #3, change the second sentence in the bottom right- hand box to read: 'if OK, got to Chart #4.'
8A-76-7 C Revised Add the sentence 'if OK, replace Multi-function Alarm Module' to the end of the bottom left-hand box in Chart #5.
8A-110-4 D Revised Add an additional Troubleshooting Hint: '14. If the Turn Flasher cycles continuously on and off, check CKT 16 for a short to ground.'
8A-114-6 A Revised Add to the end of the last SYMPTOM: 'and all doors closed (allow 40 seconds for illuminated entry timeout).'
C In the second SYMPTOM, change 'Headlights off 'to 'Interior Switch off'.
E Add as the second condition in the ACTION column for step [1]: 'Put Ignition Switch in "RUN".'
8A-114-8 B Revised In the first paragraph of the second column, change '4 seconds' to '40 seconds'.
Add to the end of the paragraph: 'if the Ignition Switch is in "RUN" or has been "OFF' less than 2 minutes, the Interior Lights remain on for about 4 seconds.'
F In the title for Chart #2, change 'Headlights off' to 'Interior Switch off'.
8A-131-3 C Revised In step [5] (Automatic Transaxle), change the first sentence to: 'Move Ignition Switch from "OFF" to "RUN".'
Between the first and second sentences, add a sentence that reads: 'Close both front doors.'
Above the first sentence of step [5] (Manual Transaxle), add a sentence that reads: 'Close both front doors.'
8A-141-0 C,D Revised Correct the Mirror Control Switch switches as follows: LEFTMOST SWITCH:
Change 'UP' to 'DOWN' and 'DOWN' to 'UP'. SECOND AND THIRD SWITCHES FROM LEFT: Label the left-hand switch position 'DOWN' and the right-hand switch position 'UP'. RIGHTMOST SWITCH: Label the left-hand switch position 'LEFT' and the right-hand switch position 'RIGHT.
Label the Mirror Control Switch pigtails as follows:
C300/A = ORN C300/C = LT GRN C300/B = YEL C300/D = WHT C300/F = LT BLU/WHT C300/G = BRN/WHT C300/E = RED/WHT C300/H = BLK
8A-146-6 E Revised Add the following to the end of the second paragraph: 'if the vehicle speed exceeds 3 MPH with either door open, the solenoids will remain de-energized until both doors are closed and the vehicle speed Is below 3 MPH.'
8A-201-1 E Revised Add '(S110 and S111 Location)' beneath 'A/C Clutch Diode'.
8A-201-3 F Revised Add '(S110 and S111 Location)' beneath' A/C Clutch Diode'.
CIRCUIT OPERATION
The Audible Warnings System sounds a chime to bring attention to one or more of several conditions. These conditions are: 1) LH front door is open; the Headlight Switch is in "HEAD" or "PARK" and the Ignition Switch is not in "RUN," "BULB TEST" or "START"; 2) the key is in the Ignition Switch and the LH front door is open; 3) the driver's seat belt is unbuckled when the Ignition Switch is turned to "Run," "BULB TEST' or "START;" 4) the vehicle travels over 3/4 mile with turn signal left on.
KEY-IN-IGNITION CHIME
Voltage is applied at all times to term "A" of the Multi-function Alarm Module through the CTSY Fuse. When the key is in the ignition and LH front door is open, term "J" of the Multi-function Alarm Module is grounded. This sounds the chime.
FASTEN BELTS CHIME
With the Ignition Switch in "RUN," "BULB TEST" or "START," voltage is applied through the GAGES Fuse to term "G" of the Multi-function Alarm Module. With the LH front seat belt unbuckled, term " D" of the Multi-function Alarm Module is grounded through the Seat Belt Switch. The fasten belts chime sounds for 4 to 8 seconds. The Fasten Belts Indicator operates for 60 to 90 seconds.
LIGHTS-ON CHIME
When the Headlight Switch is in "HEAD" or "PARK" and the Dimmer Switch is not in "OFF," volt- age is applied through the Lamp Dimmer Module to term "E" of the Multi-function Alarm Module. When the Ignition Switch is in "RUN," "BULB TEST" or "START," voltage is applied through the GAGES Fuse to term "G" of the Multi-function Alarm Module. If these two voltages are sensed, the chime will not be sounded.
When the Ignition Switch is turned to "LOCK," "OFF' or "ACCY," the GAGES Fuse loses voltage. The Multi-function Alarm Module senses the change. If voltage is available from the Headlight Switch, voltage from the CTSY Fuse is applied to sound the chime. The chime can be turned off by turning the Dimmer Switch to "OFF."
FASTEN BELTS INDICATOR
The Fasten Belts Indicator is also controlled by the Multi-function Alarm Module. The indicator will light: For 60 to 90 seconds after the ignition is turned on if the doors are closed.
Any time the doors are open and the Ignition Switch is in "RUN," "BULB TEST" or "START."
If there is a fault in the Seat Belt Retractor Solenoids circuit.
TURN SIGNAL CHIME
When a turn signal is operated, voltage is applied to term "M" and the Multi- function Alarm Module begins to monitor vehicle distance at term "N." If the turn signal is still flashing after the vehicle has traveled 3/4 mile, the turn signal warning chime will sound as the turn signal flashes.
ADDITIONAL FEATURES
The Multi-function Alarm Module also controls the Seat Belt Retractor Solenoids, Illuminated Entry features, and Automatic Door Locks. See pages 8A-114, 8A-131 and 8A-146 for further information.
CIRCUIT OPERATION
When a Front Door Lock Switch is activated in the "LOCK" or "UNLOCK" position, all of the doors lock or unlock in unison. Each lock can also be operated manually from the locking knob. In addition, with the Ignition Switch in "RUN," all Power Door Locks are automatically locked when the gear selector is moved from the "PARK" or "NEUTRAL" position or when the vehicle reaches a certain speed. The locks are operated by reversible motors that receive voltage from two relays in the Automatic Door Lock Relay. These relays operate to turn the motors on by applying voltage to one side of the Door Lock Motors and a ground to the opposite Door Lock Motor terminals.
When either Front Door Lock Switch is moved to the "LOCK" position, battery voltage is applied through the 195 CKT to the lock relay coil of the Automatic Door Lock Relay. The Automatic Door Lock Relay is energized, closing the door lock contacts and applying battery voltage to the Door Lock Motors via CKT 60 through the 295 CKT. Ground is applied to the opposite motor terminal through the normally closed unlock relay contacts within the Automatic Door Lock Relay. The Door Lock Motors then lock their respective doors.
When either Front Door Lock Switch is moved to the "UNLOCK" position, battery voltage is applied through the 194 CKT to the unlock relay coil of the Au- tomatic Door Lock Relay assembly. The door unlock relay is energized, closing the door unlock contacts and applying battery voltage to the Door Lock Motors via CKT 60 through the 294 CKT. Ground is applied to the opposite motor terminal through the normally closed lock relay contacts within the Automatic Door Lock Relay. The Door Lock Motors then unlock their respective doors.
The Automatic Door Lock feature is controlled by the Multi-function Alarm Module. In vehicles equipped with an automatic transaxle, with the Ignition Switch in "RUN" and the gear selector moved from the "PARK" or "NEUTRAL" positions, the ground signal that is applied to the Multi-function Alarm Module from the Electronic PRNDL Control Module via CKT 434 is removed. The Multi-function Alarm Module then momentarily applies battery voltage to the Automatic Door Lock Relay via CKT 195. All doors lock as described above. If the Multi-function Alarm Module receives a vehicle speed signal greater than 8 MPH without having seen a ground signal on CKT434, it momentarily applies battery voltage on CKT 195 to lock the vehicle doors. If the front doors are open, they will lock upon closing. In vehicles equipped with a manual transaxle, the Multi-function Alarm Module uses a vehicle speed signal input over the 389 CKT. The module will lock the doors once per ignition cycle.
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.
