SERVICE MANUAL UPDATE-SEC. 8A SUNROOF (REVISED DIAGNOSTICS)

SUBJECT: SERVICE MANUAL UPDATE - SECTION 8A - SUNROOF (REVISED DIAGNOSTICS)

MODELS AFFECTED: 1992 BONNEVILLE MODELS

The sunroof diagnostics found in the following service manuals have been revised.

The revised pages should replace the following pages for proper sunroof system diagnosis:

1992 Pontiac Bonneville SE, Pages 8A-122-0 through 8A-122-4

1992 Pontiac Bonneville SSE/SSEi, pages 8A-122-0 through 8A-122-4

Please update your respective service manual accordingly.

SUNROOF

TROUBLESHOOTING HINTS

- Try the following checks before doing the System Check.

1. Check Circuit Breaker 3 by operating the Power Windows.

2. If the Sunroof does not operate for 10 minutes after the Ignition Switch is turned to OFF (if equipped with Retained Accessory Power), see Section 8A-15 for diagnosis.

- Go to System Check for a guide to normal operation.

- Go to System Diagnosis for diagnostic tests.

SYSTEM CHECK

- Use the System Check Table as a guide to normal operation.

- Refer to System Diagnosis for a list of symptoms and diagnostic stops.

SYSTEM CHECK TABLE

ACTION NORMAL RESULT ------ ------------- With the Ignition Switch in RUN, Sunroof moves smoothly to the momentarily press the Sunroof Switch fully open position to the REVERSE/CLOSE VENT position NOTE: To abort the express open and release before Sunroof is fully open mode, press the Sunroof Switch once in any direction

Press the Sunroof Switch to the FORWARD/ Sunroof moves toward the closed VENT position and release before Sunroof position and stops when Sunroof is fully closed Switch is released

Press and hold the Sunroof Switch to the Sunroof moves smoothly to the FORWARD/VENT position closed position and stops

Release the Sunroof Switch and then Sunroof moves to the vent press the switch again to the position FORWARD/VENT position

Momentarily press the Sunroof Switch Sunroof moves to the closed to the REVERSE/CLOSE VENT position position then stops and release before Sunroof is fully closed

- Refer to System Diagnosis when a result is not normal.

COMPONENT LOCATION Page-Figure ------------------ ----------- I/P Fuse Block.......... Behind LH side of I/P, left of steering column, behind trim panel................ 201- 9-A Sunroof Control Module.. Center rear of sunroof, right of Sunroof Motor Assembly........................... 201- 8-E Sunroof Motor Assembly.. Center rear of sunroof................... 201- 8-E C221 (4 cavities)....... RH front comer of windshield header, top of windshield pillar................. 201- 8-E C330 (8 cavities)....... RH side of windshield header............. 201- 8-E C332 (10 cavities)...... RH front door sill, taped to composite harness.................................. 201-10-C G203.................... Below RH side of I/P, middle of shroud... 201- 9-F S218.................... Composite harness, middle of RH shroud... 201- 9-F S247.................... Composite harness, behind LH side of I/P. 201- 5-B S282.................... Composite harness, middle of RH shroud... 201- 9-F

SYSTEM DIAGNOSIS

- Do the tests listed for your symptom in the Symptom Table below.

- Tests follow the Symptom Table.

SYMPTOM TABLE

SYMPTOM DO TEST ------- ------- Sunroof does not operate A: Mechanical Binding Test

B: Sunroof Control Module Test

Sunroof operates but will not A: Mechanical Binding Test stop in the flush position D: Limit Switch Test

Sunroof operates but will not A: Mechanical Binding Test fully open or close Adjust Sunroof Actuator Assembly; refer to Service Manual Section 10

CAUTION:

A momentary actuation of the Sunroof Switch can cause the Sunroof to move directly from the vent position to the closed position. When operating the Sunroof, keep hands, clothing, etc., away from the Sunroof opening. When working near the Sunroof, leave the Ignition Switch OFF whenever possible to prevent accidental activation.

A: MECHANICAL BINDING TEST -------------------------- Partially lower the headliner, release clutch and manually crank the Sunroof using a 4 mm hex wrench.

- If there is mechanical binding, refer to Section 10 of the Service Manual for repair procedures.

- If the Sunroof operates smoothly from the hand crank, proceed to the next test listed in the Symptom Table.

B: SUNROOF CONTROL MODULE TEST (TABLE 1) ---------------------------------------- Measure: VOLTAGE

At: SUNROOF CONTROL MODULE CONNECTORS: C1 & C2 (Disconnected)

Condition: - Ignition Switch: RUN

Measure Correct For Between Voltage Diagnosis -------- -------- --------- C1/C (PNK) Battery See 1 & Ground

C1/C (PNK) & C1/10 Battery See 2 (BLK)

C1/C (PNK) & C2/7 0 volts See 3 (ORN)

C1/C (PNK) & C2/6 0 volts See 4 (BRN)

- If all voltages are correct, go to Table 2.

1. Check/repair PNK (76) wire for an open or short to ground.

2. Check/repair BLK (154) wire for an open.

3. Check/repair ORN (110) wire (see schematic) for a short to ground.

4. Check/repair BRN (100) wire (see schematic) for a short to ground.

B: SUNROOF CONTROL MODULE TEST (TABLE 2) ---------------------------------------- Measure: RESISTANCE

At: SUNROOF CONTROL MODULE CONNECTOR C2 (Disconnected)

Condition: - Sunroof: OPEN

Measure Correct For Between Resistance Diagnosis ------- ---------- --------- 5 (WHT) & Infinite See 1 6 (BRN)

5 (WHT) & Infinite See 1 7 (ORN)

8 (RED) & Infinite See 4 1 (YEL)

8 (RED) & Infinite See 5 1 (YEL)

- Sunroof Switch: REVERSE/CLOSE VENT (hold)

5 (WHT) & Less than 5 See 2 6 (BRN) ohms

- Sunroof Switch: FORWARD/VENT (hold)

5 (WHT) & Less than 5 See 3 7 (ORN) ohms

- If all resistances are correct, go to Test C: Sunroof Motor Assembly Test

1. Check for a short between WHT wire and either BRN or ORN wire. If OK, replace Sunroof Switch.

2. Check WHT and BRN wires and Sunroof Switch for an open.

3. Check WHT and ORN wires and Sunroof Switch for an open.

4. Check RED wire for a short to ground. If wire is OK, replace Sunroof Motor Assembly.

5. Check for a short between YEL and RED wires. If wires are OK or cannot be repaired, replace Sunroof Motor Assembly.

C: SUNROOF MOTOR ASSEMBLY TEST ------------------------------ Connect: FUSED JUMPERS

At: SUNROOF CONTROL MODULE CONNECTOR C1 (Disconnected)

Conditions: - Ignition Switch: RUN - Sunroof: CLOSED

Connect Correct For Between Result Diagnosis ------- ------- --------- Connect a fused jumper between C (PNK) and B (BLU) Sunroof See 1 Motor runs Connect a second fused jumper between A (GRN) and D (BLK)

- If result is correct, replace Sunroof Control Module.

1. Check/repair BLU and GRN wires to Sunroof Motor Assembly for an open or short to ground. If wires are OK or cannot be repaired, replace Sunroof Motor Assembly.

D: LIMIT SWITCH TEST -------------------- Measure: RESISTANCE

At: SUNROOF CONTROL MODULE CONNECTOR C2 (Disconnected)

Conditions: - Ignition Switch: RUN - Sunroof: CLOSED

Measure Correct For Between Resistance Diagnosis ------- ---------- --------- 8 (RED) & Less than 5 See 1 1 (YEL) ohms

- Manually crank Sunroof open using a 4mm hex wrench.

8 (RED) & Infinite See 2 1 (YEL)

8 (RED) & Infinite See 3 Ground

- If all resistances are correct, replace Sunroof Control Module.

1. Check/repair RED and YEL wires to Sunroof Motor Assembly for an open. If wires are OK or cannot be repaired, replace Sunroof Motor Assembly.

2. Replace Sunroof Motor Assembly.

3. Check/repair RED wire to Sunroof Motor Assembly for a short to ground. If wire is OK or cannot be repaired, replace Sunroof Motor Assembly.

CIRCUIT OPERATION

The Sunroof Control Module determines Sunroof Motor direction based on inputs received from the Sunroof Switch. Voltage is applied to the Module at terminal C of connector C1, allowing Sunroof operation whenever the Ignition Switch at RUN or during Retained Accessory Power.

Express Open

When the Sunroof Control Module's reverse/close vent input is grounded through the Sunroof Switch, the Module will go into the express open mode. When the Module is in the express open mode, voltage is applied to the Sunroof Motor Assembly from terminal A of connector C1 of the Module. The Sunroof Motor's ground is through terminal B of connector C1 of the Module.

The Sunroof Motor will run until one of three conditions occurs: 1) the Motor stalls when the Sunroof reaches its fully open position, 2) the Sunroof Switch is pushed to the FORWARD/ VENT position, or 3) the Sunroof Switch is released from the REVERSE/CLOSE VENT position and then pressed again.

Closing

When the Sunroof Control Module's forward/vent input is grounded through the Sunroof Switch, the Module will apply voltage to the Sunroof Motor Assembly from terminal B of connector C1. The Sunroof Motor's ground is through terminal A of connector C1 of the Module.

The Sunroof Control Module will run the Motor until the Sunroof Switch is released or the Limit Switch closes, grounding the Module's limit switch input. The Limit Switch will close when the Sunroof is in the flush closed position.

Vent

The Sunroof will move to the vent position when the Sunroof Control Module's forward vent input is grounded when the Sunroof is in the flush closed position.

Express Close Vent

The Sunroof will move to the flush closed position when the Sunroof Control Module's reverse/close vent input is grounded when the Sunroof is in the vent position. The Module will stop motor operation under the same conditions as outlined in express open.

SUNROOF (CF5)

COMPONENT LOCATION

Item Description Figure Connector ---- ----------- ------ --------- I/P Fuse Block............ Behind I/P, left of steering column..................201- 8-A Sunroof Control Module.... Center rear of sunroof, right of Sunroof Motor Assembly........201-10-E Sunroof Motor Assembly.... Center rear of sunroof...........201-10-E C221 (4 cavities)......... RH front comer of windshield header, top of windshield pillar.201-10-E C330 (8 cavities)......... RH side of windshield header.....201-10-E C332 (10 cavities)........ RH front door sill, taped to composite harness................201-12-C....202-6 G203...................... Below RH side of I/P, middle of shroud........................201- 8-F S218...................... Composite harness, middle of RH shroud........................201- 8-F S247...................... Composite harness, behind LH side of I/P......................201- 7-B S282...................... Composite harness, at middle of RH shroud.....................201- 8-F

TROUBLESHOOTING HINTS

- Try the following checks before doing the System Check.

1. Check Circuit Breaker 3 by operating the Power Windows.

2. If the Sunroof does not operate for 10 minutes after the Ignition Switch is turned to OFF (if equipped with Retained Accessory Power), see Section 8A-15 for diagnosis.

- Go to System Check for a guide to normal operation.

- Go to System Diagnosis for diagnostic tests.

SYSTEM CHECK

- Use the System Check Table as a guide to normal operation.

- Refer to System Diagnosis for a list of symptoms and diagnostic stops.

SYSTEM CHECK TABLE

ACTION NORMAL RESULT ------ ------------- With the Ignition Switch in RUN, Sunroof moves smoothly to the fully momentarily press the Sunroof Switch to open position the REVERSE/CLOSE VENT position and NOTE: To abort the express open release before Sunroof is fully open mode, press the Sunroof Switch once in any direction

Press the Sunroof Switch to the Sunroof moves toward the closed FORWARD/VENT position and release position and stops when Sunroof before Sunroof is fully closed Switch is released

Press and hold the Sunroof Switch to Sunroof moves smoothly to the the FORWARD/VENT position closed position and stops

Release the Sunroof Switch and then Sunroof moves to the vent position press the switch again to the FORWARD/VENT position

Momentarily press the Sunroof Switch Sunroof moves to the closed to the REVERSE/CLOSE VENT position and position then stops release before Sunroof is fully closed

- Refer to System Diagnosis when a result is not normal.

SUNROOF (CF5)

SYSTEM DIAGNOSIS

- Do the tests listed for your symptom in the Symptom Table below.

- Tests follow the Symptom Table.

SYMPTOM TABLE

SYMPTOM DO TEST ------- ------- Sunroof does not A: Mechanical Binding Test operate B: Sunroof Control Module Test

Sunroof operates but will A: Mechanical Binding Test not stop in the flush position D: Limit Switch Test

Sunroof operates but will not A: Mechanical Binding Test fully open or close Adjust Sunroof Actuator Assembly; refer to Service Manual Section 10

CAUTION:

A momentary actuation of the Sunroof Switch can cause the Sunroof to move directly from the vent position to the closed position. When operating the Sunroof, keep hands, clothing, etc., away from the Sunroof opening. When working near the Sunroof, leave the Ignition Switch OFF whenever possible to prevent accidental activation.

A: MECHANICAL BINDING TEST --------------------------- Partially lower the headliner, release clutch and manually crank the Sunroof using a 4 mm hex wrench.

- If there is mechanical binding, refer to Section 10 of the Service Manual for repair procedures.

-If the Sunroof operates smoothly from the hand crank, proceed to the next test listed in the Symptom Table.

B: SUNROOF CONTROL MODULE TEST (TABLE 1) ---------------------------------------- Measure: VOLTAGE

At: SUNROOF CONTROL MODULE CONNECTORS C1 & C2 (Disconnected)

Condition: - Ignition Switch: RUN

Measure Correct For Between Voltage Diagnosis ------- --------- --------- C1/C (PNK) Battery See 1 & Ground

C1/C (PNK) & C1/10 Battery See 1 (BLK)

C1/C (PNK) & C2/7 0 volts See 3 (ORN)

C1/C (PNK) & C2/6 0 volts See 4 (BRN)

- If all voltages are correct, go to Table 2.

1. Check/repair PNK (76) wire for an open or short to ground.

2. Check/repair BLK (154) wire for an open.

3. Check/repair ORN (110) wire (see schematic) for a short to ground.

4. Check/repair BRN (100) wire (see schematic) for a short to ground.

B: SUNROOF CONTROL MODULE TEST (TABLE 2) ---------------------------------------- Measure: RESISTANCE

At: SUNROOF CONTROL MODULE CONNECTOR C2 (Disconnected)

Condition: - Sunroof: OPEN

Measure Correct For Between Resistance Diagnosis ------- ---------- --------- 5 (WHT) & Infinite See 1 6 (BRN)

5 (WHT) & Infinite See 1 7 (ORN)

8 (RED) & Infinite See 4 1 (YEL)

8 (RED) & Infinite See 5 1 (YEL)

- Sunroof Switch: REVERSE/CLOSE VENT (hold)

5 (WHT) & Less than 5 See 2 6 (BRN) ohms

- Sunroof Switch: FORWARD/VENT (hold)

5 (WHT) & Less than 5 See 3 7 (ORN) ohms

- If all resistances are correct, go to Test C: Sunroof Motor Assembly Test.

1. Check for a short between WHT wire and either BRN or ORN wire. If OK, replace Sunroof Switch.

2. Check WHT and BRN wires and Sunroof Switch for an open.

3. Check WHT and ORN wires and Sunroof Switch for an open.

4. Check RED wire for a short to ground. If wire is OK, replace Sunroof Motor Assembly.

5. Check for a short between YEL and RED wires. If wires are OK or cannot be repaired, replace Sunroof Motor Assembly.

C: SUNROOF MOTOR ASSEMBLY TEST ------------------------------ Connect: FUSED JUMPERS

At: SUNROOF CONTROL MODULE CONNECTOR C1 (Disconnected)

Conditions:- Ignition Switch: RUN - Sunroof: CLOSED

Connect Correct For Between Result Diagnosis ------- -------- ----------- Connect a fused jumper between C (PNK) and B (BLU)

Connect a Sunroof See 1 second fused Motor runs jumper between A (GRN) and D (BLK)

- If result is correct, replace Sunroof Control Module.

1. Check/repair BLU and GRN wires to Sunroof Motor Assembly for an open or short to ground. If wires are OK or cannot be repaired, replace Sunroof Motor Assembly..

D: LIMIT SWITCH TEST -------------------- Measure: RESISTANCE

At: SUNROOF CONTROL MODULE CONNECTOR C2 (Disconnected)

Conditions:- Ignition Switch: RUN - Sunroof: CLOSED

Measure Correct For Between Resistance Diagnosis ------- ---------- --------- 8 (RED) & Less than 5 See 1 (YEL) ohms

- Manually crank Sunroof open using a 4 mm hex wrench.

8 (RED) & Infinite See 2 1 (YEL)

8 (RED) & Infinite See 3 Ground

- If all resistances are correct, replace Sunroof Control Module.

1. Check/repair RED and YEL wires to Sunroof Motor Assembly for an open. If wires are OK or cannot be repaired, replace Sunroof Motor Assembly.

2. Replace Sunroof Motor Assembly.

3. Check/repair RED wire to Sunroof Motor Assembly for a short to ground. If wire is OK or cannot be repaired, replace Sunroof Motor Assembly.

CIRCUIT OPERATION

The Sunroof Control Module determines Sunroof Motor direction based on inputs received from the Sunroof Switch. Voltage is applied to the Module at terminal C of connector C1, allowing Sunroof operation whenever the Ignition Switch is at RUN or during Retained Accessory Power.

Express Open

When the Sunroof Control Module's reverse/close vent input is grounded through the Sunroof Switch, the Module will go into the express open mode. When the Module is in the express open mode, voltage is applied to the Sunroof Motor Assembly from terminal A of connector C1 of the Module. The Sunroof Motor's ground is through terminal B of connector C1 of the Module.

The Sunroof Motor will run until one of three conditions occurs: 1) the Motor stalls when the Sunroof reaches its fully open position, 2) the Sunroof Switch is pushed to the FORWARD/VENT position, or 3) the Sunroof Switch is released from the REVERSE/CLOSE VENT position and then pressed again.

Closing

When the Sunroof Control Module's forward/vent input is grounded through the Sunroof Switch, the Module will apply voltage to the Sunroof Motor Assembly from terminal B of connector C1. The Sunroof Motor's ground is through terminal A of connector C1 of the Module.

The Sunroof Control Module will run the Motor until the Sunroof Switch is released or the Limit Switch closes, grounding the Module's limit switch input. The Limit Switch will close when the Sunroof is in the flush closed position.

Vent

The Sunroof will move to the vent position when the Sunroof Control Module's forward/vent input is grounded when the Sunroof is in the flush closed position.

Express Close Vent

The Sunroof will move to the flush closed position when the Sunroof Control Module's reverse/close vent input is grounded when the Sunroof is in the vent position. The Module will stop motor operation under the same conditions as outlined in express open.

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.