Chevrolet Trax: Power windows malfunction (A55, A66 WITHOUT 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 power window system will operate any time the ignition is the ACC or RUN position. The power window system will also operate whenever the I/P fuse block is in RAP mode. 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 passenger window is inoperative from both the driver and passenger window switches

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

• If the passenger window is inoperative from the passenger window switch only

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

• If the passenger window is inoperative from the driver window switch only

Test or replace the S79D Window Switch - Driver.

• If the passenger window performs the UP and DOWN functions at both switches

4. 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 1 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 3 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 4
• Control circuit terminal 5
• Control circuit terminal 6
• Control circuit terminal 7

• 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. It may take up to 2 minutes for all vehicle systems to power down
6. Disconnect the harness connector at the M74D Window Motor-Driver.
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 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. 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

9. Connect a test lamp between control circuit terminal 1 and control circuit terminal 2, ignition ON.
10. 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, 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

11. 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, 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 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, 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.

Component Testing

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

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

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