Chevrolet Trax: Power windows malfunction (A55, A66 WITH A33)

Diagnostic Instructions

• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
• Review Strategy Based Diagnosis for an overview of the diagnostic approach.
• Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Diagnostic Fault Information

Circuit/System Description

The driver power window switch contains individual window switches for each of power windows. All windows may be controlled up and down from the driver power window switch. The individual passenger power window switches will only control the up and down operation of their respective power window.

Each power window contains a reversible power window motor. The direction the window travels is dependent upon the polarity of the supply voltage. By reversing polarity of the supply voltage the window motor will move up or down. Each power window motor is internally circuit breaker protected.

Battery voltage is supplied to the power window switch through the accessory voltage supply circuit. The power window switch also receives a constant ground source. The power window motor control circuits are connected to ground through the normally closed up and down contacts of the power window switch. When the power switch is placed in the down position, the power window motor down control circuit is switched to 12 V and is applied to the down side of the power window motor. Since the other side of the power motor is connected to ground through the normally closed contacts of the up switch, the window travels down. By placing the power window switch in the up position, the polarity of the power window motor is reversed and the window travels up.

Reference Information

Schematic Reference

Moveable Window Schematics (Encore), Moveable Window Schematics (Trax)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Description and Operation

Power Windows Description and Operation

Electrical Information Reference

• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs

Circuit/System Verification

1. Ignition ON.
2. Verify the driver window performs the UP and DOWN functions.

• If the driver window does not perform the UP or DOWN functions

Refer to Circuit/System Testing - Driver Window Inoperative

• If the driver window performs the UP and DOWN functions

3. Verify the passenger window performs the UP and DOWN functions at both the driver and passenger door switches.

• If the M74P Window Motor-Passenger is inoperative from both the S79D Window Switch- Driver and S79P Window Switch-Passenger

Refer to Circuit/System Testing - Passenger Window Inoperative From Both Switches.

• If the M74P Window Motor-Passenger is inoperative from the S79P Window Switch- Passenger only

Refer to Circuit/System Testing - Passenger Window Switch Inoperative.

• If the M74P Window Motor-Passenger is inoperative from the S79D Window Switch-Driver only

Test or replace the S79D Window Switch - Driver.

• If the M74P Window Motor-Passenger performs the UP and DOWN functions at both S79D Window Switch-Driver and S79P Window Switch-Passenger

4. Verify the M74LR Window Motor-Left Rear and M74RR Window Motor-Right Rear performs the UP and DOWN functions at both the S79D Window Switch-Driver and each of the S79 Window Switch-Rear.

• If a M74 Window Motor-Rear is inoperative from both the S79D Window Switch-Driver and S79 Window Switch-Rear

Refer to Circuit/System Testing - Rear Window Inoperative From Both Switches

• If a M74 Window Motor-Rear is inoperative from the S79 Window Switch-Rear only

Refer to Circuit/System Testing - Rear Window Switch Inoperative

• If a M74 Window Motor-Rear is inoperative from the S79D Window Switch-Driver only

Test or replace the S79D Window Switch-Driver.

• If the M74 Window Motor-Rear performs the UP and DOWN functions at both the S79D Window Switch-Driver and the S79 Window Switch-Rear

5. Lock out the rear window switches by pressing the lockout switch on the S79D Window Switch-Driver.
6. Verify the M74LR Window Motor-Left Rear and M74RR Window Motor-Right Rear is inoperative at both of the S79 Window Switch-Rear .

• If both M74 Window Motor-Rear continue to function from the S79 Window Switch-Rear

Refer to Circuit/System Testing - Rear Window Lockout Inoperative

• If both M74 Window Motor-Rear is inoperative from the S79 Window Switch-Rear

7. All OK.

Circuit/System Testing

Driver Window Inoperative

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S79D Window Switch-Driver. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 10 ohms between the ground circuit terminal 11 and ground.

If 10 ohms or greater

1. Ignition OFF.
2. Test for less than 2 ohms in the ground circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, repair the open/high resistance in the ground connection.
• If less than 10 ohms

3. Ignition ON.
4. Verify a test lamp illuminates between the ignition circuit terminal 12 and ground.

• If the test lamp does not illuminate and the circuit fuse is good

1. Ignition OFF.
2. Test for less than 2 ohms in the ignition circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, refer to Retained Accessory Power Malfunction .
• If the test lamp does not illuminate and the circuit fuse is open

1. Ignition OFF.
2. Test for infinite resistance between the ignition circuit and ground.

• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the S79D Window Switch-Driver.
• If the test lamp illuminates

5. Ignition OFF and all vehicle systems OFF, connect the harness connector at the S79D Window Switch- Driver and disconnect the harness connector at the M74D Window Motor-Driver. It may take up to 2 minutes for all vehicle systems to power down
6. Test for less than 10 ohms between the control circuit terminal 1 and ground.

• If 10 ohms or greater

1. Ignition OFF, disconnect the harness connector at the S79D Window Switch-Driver.
2. Test for less than 2 ohms in the control circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the S79D Window Switch-Driver.
• If less than 10 ohms

7. Test for less than 10 ohms between the control circuit terminal 2 and ground.

• If 10 ohms or greater

1. Ignition OFF, disconnect the harness connector at the S79D Window Switch-Driver.
2. Test for less than 2 ohms in the control circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the S79D Window Switch-Driver.
• If less than 10 ohms

8. Connect a test lamp between the control circuit terminal 1 and control circuit terminal 2, ignition ON.
9. Verify the test lamp turns ON when commanding the UP and DOWN states with the S79D Window Switch-Driver.

• If the test lamp remains OFF during either of the commands

1. Ignition OFF, remove the test lamp, disconnect the harness connector at the S79D Window Switch- Driver.
2. Test for infinite resistance between each control circuit and ground.

• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the S79D Window Switch-Driver.
• If the test lamp turns ON during each of the commands

10. Test or replace the M74D Window Motor-Driver.

Passenger Window Inoperative From Both Switches

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S79P Window Switch- Passenger. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 10 ohms between the control circuit terminal 3 and ground.

If 10 ohms or greater

1. Ignition OFF, disconnect the harness connector at the S79D Window Switch-Driver.
2. Test for less than 2 ohms in the control circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the S79D Window Switch-Driver.
• If less than 10 ohms

3. Test for less than 10 ohms between the control circuit terminal 6 and ground.

If 10 ohms or greater

1. Ignition OFF, disconnect the harness connector at the S79D Window Switch-Driver.
2. Test for less than 2 ohms in the control circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the S79D Window Switch-Driver.

If less than 10 ohms

4. Connect a test lamp between the control circuit terminal 3 and control circuit terminal 6, ignition ON.
5. Verify the test lamp turns ON when commanding the UP and DOWN functions with the S79D Window Switch-Driver.

If the test lamp remains OFF during either of the commands

1. Ignition OFF, remove the test lamp, disconnect the harness connector at the S79D Window Switch- Driver.
2. Test for infinite resistance between each control circuit and ground.

• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the S79D Window Switch-Driver.
• If the test lamp turns ON during each of the commands

6. Ignition OFF and all vehicle systems OFF, connect the harness connector at the S79P Window Switch- Passenger and disconnect the harness connector at the M74P Window Motor-Passenger. It may take up to 2 minutes for all vehicle systems to power down.
7. Test for less than 10 ohms between the control circuit terminal 1 and ground.

If 10 ohms or greater

1. Ignition OFF, disconnect the harness connector at the S79P Window Switch-Passenger.
2. Test for less than 2 ohms in the control circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the S79P Window Switch-Passenger.
• If less than 10 ohms

8. Test for less than 10 ohms between the control circuit terminal 2 and ground.

• If 10 ohms or greater

1. Ignition OFF, disconnect the harness connector at the S79P Window Switch-Passenger.
2. Test for less than 2 ohms in the control circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the S79P Window Switch-Passenger.
• If less than 10 ohms

9. Connect a test lamp between the control circuit terminal 1 and control circuit terminal 2, ignition ON.
10. Verify the test lamp turns ON when commanding the UP and DOWN functions with the S79P Window Switch-Passenger.

• If the test lamp remains OFF during either of the commands

1. Ignition OFF, remove the test lamp, disconnect the harness connector at the S79P Window Switch- Passenger.
2. Test for infinite resistance between each control circuit and ground.

• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the S79P Window Switch-Passenger.

  If the test lamp turns ON during each of the commands

11. Test or replace the M74P window motor - passenger.

Passenger Window Switch Inoperative

1. Ignition OFF, disconnect the harness connector at the S79P Window Switch-Passenger, ignition ON
2. Verify a test lamp illuminates between the ignition circuit terminal 5 and ground.

• If the test lamp does not illuminate

1. Ignition OFF.
2. Test for less than 2 ohms in the ignition circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, verify the fuse is OK and there is voltage at the fuse.
• If the test lamp illuminates

3. Test or replace the S79P Window Switch-Passenger.

Rear Window Inoperative From Both Switches

1. Ignition OFF, disconnect the harness connector at the S79D Window Switch-Driver. Ignition ON
2. Verify a test lamp illuminates between the ignition circuit terminal 6 and ground.

If the test lamp does not illuminate and the circuit fuse is good

1. Ignition OFF.
2. Test for less than 2 ohms in the ignition circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, refer to Retained Accessory Power Malfunction .
• If the test lamp does not illuminate and the circuit fuse is open

1. Ignition OFF.
2. Test for infinite resistance between the ignition circuit and ground.

• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance

3. Test for infinite resistance between the control circuits listed below and ground:

• Control circuit terminal 1
• Control circuit terminal 2
• Control circuit terminal 3
• Control circuit terminal 4
• Control circuit terminal 5

• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the S79D Window Switch-Driver.
• If the test lamp illuminates

3. Ignition OFF and all vehicle systems OFF, connect the harness connector at the S79D Window Switch- Driver and disconnect the harness connector at the appropriate S79 Window Switch-Rear. It may take up to 2 minutes for all vehicle systems to power down
4. Test for less than 10 ohms between the control circuit terminal 3 and ground.

If 10 ohms or greater

1. Ignition OFF, disconnect the harness connector at the S79D Window Switch-Driver.
2. Test for less than 2 ohms in the control circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the S79D Window Switch-Driver.
• If less than 10 ohms

5. Test for less than 10 ohms between the control circuit terminal 6 and ground.

• If 10 ohms or greater

1. Ignition OFF, disconnect the harness connector at the S79D Window Switch-Driver.
2. Test for less than 2 ohms in the control circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the S79D Window Switch-Driver.
• If less than 10 ohms

6. Connect a test lamp between the control circuit terminal 3 and control circuit terminal 6, ignition ON.
7. Verify the test lamp turns ON when commanding the UP and DOWN states with the S79D Window Switch-Driver.

• If the test lamp remains OFF during either of the commands

1. Ignition OFF, remove the test lamp, disconnect the harness connector at the S79D Window Switch- Driver.
2. Test for infinite resistance between each control circuit and ground.

• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the S79D Window Switch-Driver.
• If the test lamp turns ON during each of the commands

8. Ignition OFF and all vehicle systems OFF, connect the harness connector at the S79 Window Switch- Rear and disconnect the harness connector at the M74 Window Motor-Rear. It may take up to 2 minutes for all vehicle systems to power down.
9. Test for less than 10 ohms between the control circuit terminal listed below and ground:

• Control terminal 1
• Control terminal 2
• If 10 ohms or greater

1. Ignition OFF, disconnect the harness connector at the S79 Window Switch-Rear.
2. Test for less than 2 ohms in the control circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the S79 Window Switch-Rear.
• If less than 10 ohms

10. Connect a test lamp between the control circuit terminal 1 and the control circuit terminal 2, ignition ON.
11. Verify the test lamp turns ON when commanding the UP and DOWN states with the S79 Window Switch-Rear.

• If the test lamp remains OFF during either of the commands

1. Ignition OFF, remove the test lamp, disconnect the harness connector at the S79 Window Switch- Rear.
2. Test for infinite resistance between each control circuit and ground.

• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the S79 Window Switch-Rear.
• If the test lamp turns ON during each of the commands

12. Test or replace the M74 Window Motor-Rear.

Rear Window Lockout Malfunction

1. Ignition OFF, disconnect the harness connector at the appropriate S79 Window Switch-Rear.
2. Ignition ON, connect a test lamp between the control circuit terminal 5 and ground.
3. Verify the test lamp turns ON and OFF when commanding the rear window lockout ON and OFF with the S79D Window Switch-Driver.

• If the test lamp is always OFF

1. Ignition OFF, remove the test lamp, disconnect the harness connector at the S79D Window Switch- Driver.
2. Test for infinite resistance between the control circuit and ground.

• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance

3. Test for less than 2 ohms in the control circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the S79D Window Switch-Driver.
• If the test lamp is always ON

1. Ignition OFF, remove the test lamp, disconnect the harness connector at the S79D Window Switch- Driver, ignition ON.
2. Test for less than 1 V between the control circuit and ground.

• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the S79D Window Switch-Driver.
• If the test lamp turns ON and OFF

4. Test or replace the S79 Window Switch-Rear.

Component Testing

Window Motor

1. Ignition OFF, disconnect the harness connector at the appropriate M74 Window Motor.
2. Install a 20 A fused jumper wire between one of the control terminals and 12 V. Momentarily install a jumper wire between the other control terminal and ground. Reverse the jumper wires at least two times, the M74 Window Motor should perform the UP and DOWN functions.

• If the motor does not perform the UP and DOWN functions

Replace the M74 Window Motor

• If the motor performs the UP and DOWN functions

3. All OK

Driver Window Switch

1. Ignition OFF, disconnect the harness connector at the S79D Window Switch-Driver.
2. Test for infinite resistance between the terminals listed below with the switch in the open position:

• Ignition terminal 13 and control terminal 12
• Ignition terminal 13 and control terminal 14
• Ignition terminal 6 and control terminal 2
• Ignition terminal 6 and control terminal 3
• Ignition terminal 6 and control terminal 4
• Ignition terminal 6 and control terminal 5
• If less than infinite resistance

Replace the S79D Window Switch-Driver.

If infinite resistance

3. Test for less than 3 ohms between the terminals listed below with the switch in the open position:

• Ground terminal 11 and control terminal 2
• Ground terminal 11 and control terminal 3
• Ground terminal 11 and control terminal 4
• Ground terminal 11 and control terminal 5
• Ground terminal 11 and control terminal 12
• Ground terminal 11 and control terminal 14
• If 3 ohms or greater

Replace the S79D Window Switch-Driver.

• If less than 3 ohms

4. Test for less than 3 ohms between the terminals listed below with the switch in the Up position.

• Ignition terminal 13 and control terminal 14
• Ignition terminal 6 and control terminal 3
• Ignition terminal 6 and control terminal 5
• If 3 ohms or greater

Replace the S79D Window Switch-Driver.

• If less than 3 ohms

5. Test for less than 3 ohms between the terminals listed below with the switch in the Down position:

• Ignition terminal 13 and control terminal 12
• Ignition terminal 6 and control terminal 2
• Ignition terminal 6 and control terminal 4
• If 3 ohms or greater

Replace the S79D Window Switch-Driver.

• If less than 3 ohms

6. All OK

Passenger Window Switch

1. Ignition OFF, disconnect the harness connector at the S79P Window Switch-Passenger.
2. Test for infinite resistance between the terminals listed below with the switch in the open position:

• Ignition terminal 5 and control terminal 1
• Ignition terminal 5 and control terminal 4
• If less than infinite resistance

Replace the S79P Window Switch-Passenger

• If infinite resistance

3. Test for less than 3 ohms between the control terminals listed below with the switch in the open position:

• Control terminal 3 and control terminal 1
• Control terminal 4 and control terminal 6
• If 3 ohms or greater

Replace the S79P Window Switch-Passenger.

• If less than 3 ohms

4. Test for less than 3 ohms between the ignition terminal 5 and the control terminal 1 with the switch in the Up position.

• If 3 ohms or greater

Replace the S79P Window Switch-Passenger.

• If less than 3 ohms

5. Test for less than 3 ohms between the ignition terminal 5 and the control terminal 4 with the switch in the Down position.

• If 3 ohms or greater

Replace the S79P Window Switch-Passenger.

• If less than 3 ohms

6. All OK

Rear Window Switch

1. Ignition OFF, disconnect the harness connector at the appropriate S79 Window Switch-Rear.
2. Test for infinite resistance between the terminals listed below with the switch in the open position:

• Control terminal 5 and control terminal 1
• Control terminal 5 and control terminal 4
• If less than infinite resistance

Replace the S79 Window Switch-Rear..

• If infinite resistance

3. Test for less than 3 ohms between the control terminals listed below with the switch in the open position:

• Control terminal 3 and control terminal 1
• Control terminal 4 and control terminal 6
• If 3 ohms or greater

Replace the S79 Window Switch-Rear..

If less than 3 ohms

4. Test for less than 3 ohms between the control terminal 5 and the control terminal 1 with the switch in the Up position.

• If 3 ohms or greater

Replace the S79 Window Switch-Rear..

• If less than 3 ohms

5. Test for less than 3 ohms between the control terminal 5 and the control terminal 4 with the switch in the Down position.

• If 3 ohms or greater

Replace the S79 Window Switch-Rear..

• If less than 3 ohms

6. All OK

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

• Front Side Door Window Switch Replacement (Driver Side, Encore), Front Side Door Window Switch Replacement (Passenger Side, Encore), Front Side Door Window Switch Replacement (Driver Side, Trax), Front Side Door Window Switch Replacement (Passenger Side, Trax)
• Front Side Door Window Regulator Motor Replacement
• Rear Side Door Window Regulator Motor Replacement
• Rear Side Door Window Switch Replacement

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