GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2008 🢒 STS 🢒 Body Systems 🢒 Fixed and Moveable Windows 🢒 Power Windows 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 procedure.
    •  Diagnostic Procedure Instructions provide an overview of each diagnostic category.

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Driver Window Motor B+

1

1

--

--

LR Window Motor B+

1

1

--

--

Passenger Window Motor B+

1

1

--

--

RR Window Motor B+

1

1

--

--

LR Window Switch Down Signal

B3165 02

2

2

--

RR Window Switch Down Signal

B3165 02

2

2

--

LR Window Switch Up Signal

B3160 02

2

2

--

Passenger Window Switch Up Signal

B3160 02

2

2

--

Passenger Window Switch Down Signal

B3165 02

2

2

--

RR Window Switch Up Signal

B3160 02

2

2

--

LR Window Switch Express Signal

B3275 02

2

2

--

Passenger Window Switch Express Signal

B3275 02

2

2

--

RR Window Switch Express Signal

B3275 02

2

2

--

LF Window Motor Down Signal

1

1

1

--

LR Window Motor Down Signal

1

1

1

--

RF Window Motor Down Signal

1

1

1

--

RR Window Motor Down Signal

1

1

1

--

LF Window Motor Up Signal

1

1

1

--

LR Window Motor Up Signal

1

1

1

--

RF Window Motor Up Signal

1

1

1

--

RR Window Motor Up Signal

1

1

1

--

Front Passenger Window Switch Ground

--

2

--

--

LR Window Switch Ground

--

2

--

--

RR Window Switch Ground

--

2

--

--

Driver Window Motor Ground

--

1

--

--

LR Window Motor Ground

--

1

--

--

Passenger Window Motor Ground

--

1

--

--

RR Window Motor Ground

--

1

--

--

  1. Power Window Motor Malfunction
  2. Passenger Window Switch Malfunction

Circuit/System Description

Each door is equipped with a power window motor that contains its own module. Each power window motor receives a hot at all times battery supply voltage and constant ground source. When a window switch on the driver master control is activated to the up or down position, the driver window switch will interpret the signal and send a serial data message to the door module. Upon receipt of the message, the door module will send a voltage signal to the window motor module on the window motor signal circuit. The window motor module will then supply battery voltage and ground to the window motor to drive the window motor up or down.

When a power window is activated from a passenger door switch, the operation is the same as described above except, the window motor signal circuits are connected directly to the associated door module.

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
  1. Ignition ON, observe the operation of the power windows while commanding each window UP and DOWN by using their respective window switches, each window should perform the UP and DOWN function from each switch.
    2. ⇒If the driver window is malfunctioning, refer to Driver Power Window Malfunction.
    ⇒If the front or rear passenger window is malfunctioning, refer to Passenger Power Window Malfunction.
  2. Observe the scan tool Window Lockout Switch parameter while pressing and depressing the window lockout switch on the driver master control. The parameter should change between On and Off.
    3. ⇒If the value does not change between commanded states, replace the driver window switch.
  3. Command the EXPRESS UP and EXPRESS DOWN functions of each window by using the window switches on the driver master control, each window should perform the EXPRESS UP and EXPRESS DOWN functions.
    4. ⇒If the function does not perform as specified, refer to Window Motor Programming - Express Function .

Circuit/System Testing

Driver Power Window Malfunction

  1. Ignition OFF, disconnect the harness connector at the driver window switch.
  2. Test for less than 5 ohms between the ground circuit terminal 3 and ground.
    3. ⇒If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 2 and ground.
    4. ⇒If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the DDM.
  4. Ignition OFF, disconnect the X1 harness connector at the DDM.
  5. Test for less than 1 ohm between the ground circuit terminal 9 and ground.
    6. ⇒If greater than the specified range, test the ground circuit for and open/high resistance.
  6. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 2 and ground.
    7. ⇒If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  7. Ignition OFF, connect the X1 harness connector at the DDM.
  8. Ignition ON, verify the scan tool Driver LF Window Switch, Driver RF Window Switch, Driver LR Window Switch, and Driver RR Window Switch parameters are Idle.
    9. ⇒If not the specified value, replace the DDM
  9. Ignition OFF, connect the harness connector at the driver window switch.
  10. Ignition ON, observe the scan tool Driver LF Window Switch, Driver RF Window Switch, Driver LR Window Switch, and Driver RR Window Switch parameters while using the window switches on the driver master control. The parameters should change from Idle to Up, Down, Express Up and Xpress Down.
    11. ⇒If all values do not change from Idle, replace the DDM.
    ⇒If some values do not change, replace the driver window switch.
  11. Ignition OFF, disconnect the harness connector at the driver window motor.
  12. Test for less than 5 ohms between the ground circuit terminal 4 and ground.
    13. ⇒If greater than the specified range, test the ground circuit for and open/high resistance.
  13. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 6 and ground.
    14. ⇒If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  14. Connect a test lamp between the control circuit terminal 1 and ground.
  15. Command the Driver Window Motor DOWN with a scan tool, the test lamp should illuminate during the DOWN command.
    16. ⇒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, replace the DDM.
    ⇒If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the DDM.
  16. Connect a test lamp between the control circuit terminal 2 and ground.
  17. Command the Driver Window Motor UP with a scan tool, the test lamp should illuminate during the UP command.
    18. ⇒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, replace the DDM.
    ⇒If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the DDM.
  18. If all circuits test normal, replace the driver window motor.

Passenger Power Window Malfunction

  1. Ignition OFF, disconnect the harness connector at the appropriate passenger window switch.
  2. Ignition ON, verify that a test lamp illuminates between the low reference circuit terminal 4 and B+.
    3. ⇒If the test lamp does not illuminate, test the low reference circuit for a short to voltage or and open/high resistance. If the circuit tests normal, replace the door module.
  3. Verify the scan tool Window Switch parameter is Idle.
    4. ⇒If not the specified value, test the signal circuit terminal listed below for a short to ground, if the circuit tests normal, replace the door module.
    • Down signal circuit terminal 1
    • Express down signal circuit terminal 3
    • Up signal circuit terminal 2
  4. Ignition OFF, connect the harness connector at the window switch.
  5. Ignition ON, observe the scan tool Window Switch parameters while using the window switch. The parameters should change from Idle to Up, Down, Express Down
    6. ⇒If the parameters do not change, test the signal circuit listed below for a short to voltage or an open/high resistance. If the circuit tests normal, test or replace the window switch.
    • Down signal circuit terminal 1
    • Express down signal circuit terminal 3
    • Up signal circuit terminal 2
  6. Ignition OFF, disconnect the harness connector at the passenger window motor.
  7. Test for less than 5 ohms between the ground circuit terminal 4 and ground.
    8. ⇒If greater than the specified range, test the ground circuit for and open/high resistance.
  8. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 6 and ground.
    9. ⇒If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  9. Connect a test lamp between the control circuit terminal 1 and ground.
  10. Command the passenger window DOWN by using the passenger window switch, the test lamp should illuminate during the DOWN command.
    11. ⇒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, replace the door module.
    ⇒If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the door module.
  11. Connect a test lamp between the control circuit terminal 2 and ground.
  12. Command the passenger window UP by using the passenger window switch, the test lamp should illuminate during the UP command.
    13. ⇒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, replace the door module.
    ⇒If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the door module.
  13. If all circuits test normal, replace the passenger window motor.

Component Testing

Passenger Window Switch

  1. Ignition OFF, disconnect the harness connector at the appropriate passenger window switch.
  2. Test for infinite resistance between the signal terminals 1, 2 and 3 and the low reference terminal 4 with the switch in the inactive position.
    3. ⇒If not the specified value, replace the passenger window switch.
  3. Test for less than 2 ohms between the signal terminal 2 and the low reference terminal 4 with the switch in the up position.
    4. ⇒If greater than the specified range, replace the passenger window switch.
  4. Test for less than 2 ohms between the signal terminal 1 and the low reference terminal 4 with the switch in the down position.
    5. ⇒If greater than the specified range, replace the passenger window switch.
  5. Test for less than 2 ohms between the signal terminal 3 and the low reference terminal 4 with the switch in the express down position.
    6. ⇒If greater than the specified range, replace the passenger window switch.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Front Side Door Window Switch Replacement
    •  Front Side Door Window Regulator Replacement
    •  Rear Side Door Window Regulator Replacement
    •  Rear Side Door Window Switch Replacement
    •  Control Module References for DDM, PDM, LRDM, RRDM or driver window switch replacement, setup, and programming