GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2009 🢒 Silverado - 4WD 🢒 Body Systems 🢒 Fixed and Moveable Windows 🢒 Power Rear Sliding Window Malfunction

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

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Sliding Rear Window Relay B+

2

2

--

--

Sliding Rear Window Switch Accessory Voltage

1

1

--

--

Sliding Rear Window Relay Control

2

2

2

--

Sliding Rear Window Motor Control

2

2

2

--

Sliding Rear Window Relay Ground

--

2

2

--

1. Sliding Rear Window Switch Malfunction

2. Sliding Rear Window Motor Malfunction

Circuit/System Description

The power sliding rear window motor is controlled from the sliding rear window switch through OPEN and CLOSE relays. The sliding rear window switch is supplied voltage from the body control module (BCM) accessory voltage output circuit. When the switch is pressed in the OPEN or CLOSE position, the sliding rear window open relay or the sliding rear window close relay coil will be supplied accessory voltage and energized through the appropriate relay control circuit. While the sliding rear window open relay or the sliding rear window close relay are in a de-energized state both motor control circuits will be closed to ground. When one of the relays is energized its motor control circuit will be closed to the battery voltage supply circuit and the other motor control circuit will remain grounded through the de-energized relay.

Reference Information

Schematic Reference

Moveable Window Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Power Windows Description and Operation

Electrical Information Reference

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

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Ignition ON, command the sliding rear window to OPEN/CLOSE by pressing the front and rear side of the sliding rear window switch. The sliding rear window should OPEN and CLOSE as commanded.

Circuit/System Testing
  1. Ignition OFF, disconnect the harness connector at the sliding rear window switch.
  2. Ignition ON, verify the test lamp illuminates between the accessory voltage circuit terminal A and ground.
    3. ⇒If the test lamp does not illuminate, test the accessory voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal replace the BCM.
  3. Ignition OFF, connect the sliding rear window switch and disconnect the sliding rear window open and sliding rear window close relays.
  4. Test for less than 1 ohm between the ground circuit terminal B2 and ground.
    5. ⇒If greater than the specified range, test the ground circuit for an open/high resistance.
  5. Test for less than 1 ohm between the ground circuit terminal A1 and ground.
    6. ⇒If greater than the specified range, test the ground circuit for an open/high resistance.
  6. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal C1 and ground.
    7. ⇒If the test lamp illuminates, test the control circuit for a short to voltage.
  7. Verify that a test lamp illuminates between the B+ circuit terminal A2 and ground.
    8. ⇒If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  8. Connect a test lamp between the control circuit terminal C2 and the ground circuit terminal A1.
  9. Command the power sliding window to OPEN and CLOSE by using the sliding rear window switch. The test lamp should turn ON and OFF when changing between the commanded states.
    10. ⇒If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the sliding rear window switch.
    ⇒If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, test or replace the sliding rear window switch.
  10. Ignition OFF, connect the sliding rear window open and sliding rear window close relays.
  11. Disconnect the harness connector at the sliding rear window motor.
  12. Test for less than 5 ohms between the control circuit terminal A and ground.
    13. ⇒If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuits test normal, replace the sliding rear window close relay.
  13. Test for less than 5 ohms between the control circuit terminal B and ground.
    14. ⇒If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuits test normal, replace the sliding rear window open relay
  14. Connect a test lamp between the control circuit terminal A and ground.
  15. Ignition ON, command the sliding rear window to CLOSE by using the sliding rear window switch. The test lamp should turn ON when commanding CLOSE state.
    16. ⇒If the test lamp is always OFF, test the control circuit for a short to ground. If the circuit tests normal, test or replace the sliding rear window close relay.
  16. Connect a test lamp between the control circuit terminal B and ground.
  17. Command the sliding rear window to OPEN by using the sliding rear window switch. The test lamp should turn ON when commanding OPEN state.
    18. ⇒If the test lamp is always OFF, test the control circuit for a short to ground. If the circuit tests normal, test or replace the sliding rear window open relay.
  18. If all circuits test normal, test or replace the sliding rear window motor.

Component Testing

Sliding Rear Window Switch

  1. Ignition OFF, disconnect the harness connector at the sliding rear window switch.
  2. Test for infinite resistance between the control terminals C and B and the voltage terminal A with the switch in the INACTIVE position.
    3. ⇒If less than the specified value, replace the sliding rear window switch.
  3. Test for less than 2 ohms between the control terminal C and the voltage terminal A with the switch in the CLOSE position.
    4. ⇒If greater than the specified range, replace the sliding rear window switch.
  4. Test for less than 2 ohms between the control terminal B and the voltage terminal A with the switch in the OPEN position.
    5. ⇒If greater than the specified range, replace the sliding rear window switch.

Relay Test

  1. Ignition OFF, disconnect the appropriate relay.
  2. Test for 60-200 ohms between terminals 85 and 86.
    3. ⇒If not within the specified range, replace the relay.
  3. Test for infinite resistance between the following terminals:
    4. • 30 and 86
    • 30 and 87
    • 30 and 85
    • 85 and 87
    ⇒If not the specified value, replace the relay.
  4. Test for less than 2 ohms between terminals 30 and 87A.
    5. ⇒If greater than the specified range, replace the relay.
  5. Install a 3-amp fused jumper wire between relay terminal 85 and 12 volts. Install a jumper wire between relay terminal 86 and ground. Test for less than 2 ohms of resistance between terminals 30 and 87.
    6. ⇒If greater than the specified range, replace the relay.

Sliding Rear Window Motor

  1. Ignition OFF, disconnect the harness connector at the sliding rear window motor.
  2. Install a 25A fused jumper wire between the control terminal A and 12 volts. Momentarily install a jumper wire between the control terminal B and ground. The sliding rear window motor should perform the OPEN or CLOSE function.
    3. ⇒If the function does not perform as specified, replace the sliding rear window motor.
  3. Reverse the jumper wires; the sliding rear window motor should perform the CLOSE or OPEN function.
    4. ⇒If the function does not perform as specified, replace the sliding rear window motor.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Rear Sliding Window Module Replacement
    •  Relay Replacement
    •  Roof Console Replacement
    •  Control Module References for BCM replacement, setup and programming