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 |
|---|---|---|---|---|
Driver Window Motor B+ | 1, 2, 3, 4 | 1 | -- | -- |
LR Window Motor B+ | 1, 2, 3, 4 | 3 | -- | -- |
Front Passenger Window Motor B+ | 1, 2, 3, 4 | 2 | -- | -- |
RR Window Motor B+ | 1, 2, 3, 4 | 4 | -- | -- |
Driver Window Motor Serial Data | 1 | 1 | 1 | -- |
Front Passenger Window Motor Serial Data | 2 | 2 | 2 | -- |
LR Window Motor Serial Data | 3 | 3 | 3 | -- |
RR Window Motor Serial Data | 4 | 4 | 4 | -- |
Power Window Driver Switch Voltage Reference | 3 | 3 | 3 | -- |
Power Window Passenger Switch Voltage Reference | 4 | 4 | 4 | -- |
Power Window Switch Left Rear Signal | 3 | 3 | 3 | -- |
Power Window Switch Right Rear Signal | 4 | 4 | 4 | -- |
Driver Window Motor Ground | -- | 2 | 2 | -- |
Front Passenger Window Motor Ground | -- | 2 | 2 | -- |
LR Window Motor Ground | -- | 3 | 3 | -- |
RR Window Motor Ground | -- | 4 | 4 | -- |
1. Driver Window Malfunction 2. Passenger Window Malfunction 3. Left Rear Window Malfunction 4. Right Rear Window Malfunction | ||||
Circuit/System Description
The front and rear power windows are controlled by the driver door module (DDM) and front passenger door module (PDM). The DDM and PDM each contain power window switches that are integrated into the module. The DDM contains the master power window switch that controls all power window operations. The DDM supplies the left rear power window switch with a 12-volt reference and signal circuit. The power window switch contained in the PDM controls the front passenger window operation only. The PDM supplies the right rear power window switch with a 12-volt reference and signal circuit.
When the driver power window switch is activated to a desired position, the DDM examines the request and checks for messages from other vehicle control modules prohibiting window movement. If no prohibitive messages have been received, the DDM will send a LIN serial data message to the driver door window motor to move the window to the desired position.
When the DDM receives a request to operate one of the right side passenger windows from the driver master control, a GMLAN serial data message is sent to the PDM. The PDM examines the request and checks for messages from other vehicle control modules prohibiting the window movement. If no prohibitive messages have been received, the PDM will send a LIN serial data message to the appropriate window motor to move the window as requested.
The DDM and PDM supply their respective rear power window switches with a 12-volt reference and signal circuit. The rear power window switches contain separate resistors for each switch position. When a rear power window switch is activated, the associated door control module interprets the signal and checks for messages from other vehicle control modules prohibiting the window movement. If no prohibitive messages have been received, the door control module sends a LIN serial data message to the appropriate power window motor commanding the requested window position.
Reference Information
Schematic Reference
Connector End View Reference
Window Systems Connector End Views
Description and Operation
Power Windows Description and Operation
Electrical Information Reference
Scan Tool Reference
Circuit/System Verification
- Ignition ON, observe the scan tool DDM LF Window Switch, RF Window Switch, LR Window Switch, and RR Window Switch parameters. Verify the parameter cycles between Off, Up, Down, Express Up, and Express Down while operating the applicable switch.
- Observe the scan tool FPDM Passenger Window Switch parameter. Verify the parameter cycles between Off, Up, Down, Express Up, and Express Down while operating the switch
- Observe the scan tool DDM Window Lockout Switch parameter. The parameter should cycle between On and Off while cycling the window lockout switch.
- Operate each of the vehicle windows using the driver and passenger door window switches. Each window should perform the appropriate Up/Down function.
- Operate each of the rear windows using the appropriate rear window switch. Each window should perform the appropriate Up/Down function.
| ⇒ | If the parameter does not cycle between the specified values, replace the DDM. |
| ⇒ | If the parameter does not cycle between the specified values, replace the FPDM. |
| ⇒ | If the parameter does not cycle between the specified values, replace the DDM. |
| ⇒ | If any window does not perform the commanded Up/Down function, refer to Door Window Motor Circuit Malfunction. |
| ⇒ | If any window does not perform the commanded Up/Down function, refer to Rear Window Switch Circuit Malfunction. |
Circuit/System Testing
Door Window Motor Circuit Malfunction
- Ignition OFF, disconnect the harness connector at the appropriate window motor.
- Ignition OFF, test for less than 2.0 ohms of resistance between the ground circuit terminal 4 and ground.
- Ignition ON, verify a test lamp illuminates between the B+ circuit terminal 1 and ground.
- Test for 6.0-7.0 volts between the LIN circuit terminal 6 and ground.
- Ignition OFF, reconnect the harness connector at the window motor.
- Ignition ON, observe the appropriate scan tool Window Motor Fault Status parameter while raising and lower the window. The parameter should read No Fault.
- If all circuits test normal, replace the appropriate door module.
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
| ⇒ | If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. |
| ⇒ | If greater than the specified range, test the LIN circuit for a short to voltage. If the circuit tests normal, replace the applicable door module. |
| ⇒ | If less than the specified range, test the LIN circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the applicable door module. |
| ⇒ | If the parameter reads Motor Fault, Hall Fault, Memory Fault, LIN Fault, Anti-Trap Fault or Thermo Active, test or replace the appropriate power window motor. |
Rear Window Switch Circuit Malfunction
- Ignition OFF, disconnect the harness connector at the applicable rear door window switch.
- Ignition ON, test for B+ between the reference voltage circuit terminal 3 and ground.
- Ignition OFF, reconnect the harness connector at the rear door window switch. Disconnect the harness connector C2 at the appropriate door module.
- With the switch in the at-rest position, test for 8.0K - 9.0K ohms of resistance between the voltage reference circuit terminal 16 and the signal circuit terminal 14.
- With the switch in the AUTO DOWN position, test for 2.75K - 3.75K ohms of resistance between the voltage reference circuit terminal 16 and the signal circuit terminal 14.
- With the switch in the DOWN position, test for 5.25K - 6.25K ohms of resistance between the voltage reference circuit terminal 16 and the signal circuit terminal 14.
- With the switch in the UP position, test for 1.9K - 2.9K ohms of resistance between the voltage reference circuit terminal 16 and the signal circuit terminal 14.
- If all circuits test normal, replace the appropriate door module.
| ⇒ | If less than the specified value, test the reference voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the appropriate door module. |
| ⇒ | If not within the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, test or replace the appropriate rear door window switch. |
| ⇒ | If not within the specified range, test or replace the appropriate rear door window switch. |
| ⇒ | If not within the specified range, test or replace the appropriate rear door window switch. |
| ⇒ | If not within the specified range, test or replace the appropriate rear door window switch. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for DDM and FPDM replacement, setup, and programming |
