B1856

B1856-DRIVER WINDOW MOTOR CONTROL CIRCUIT OPEN





For a complete wiring diagram, refer to the Wiring Information.

- When Monitored:
Whenever the module is awake.

- Set Condition:
When one or both Driver Window Driver circuits (Up and Down) are not supplied with voltage, when they should be, during a window movement command for more than five ms., this code will set.





1. TEST FOR INTERMITTENT CONDITION

NOTE: This test shows text for a Left Hand Drive (LHD) vehicle. Right Hand Drive (RHD) vehicles use the same cavities. Refer to the schematic for difference names and circuit numbers.

1. Turn the ignition on.
2. With the scan tool, record and erase the DTCs
3. Try to operate the Driver Window up and down several times.
4. Wait 30 seconds.
5. With the scan tool, read the DTCs.

Does the scan tool display B1856-DRIVER WINDOW MOTOR CONTROL CIRCUIT OPEN?

Yes

- Go To 2

No

- The conditions that caused this code to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

2. WINDOW MOTOR OR CIRCUIT OPEN




1. Turn the ignition off.
2. Disconnect the Driver Express Window Motor connector.
3. Connect a test light between the (Q311) Left Front Window Express Up Driver circuit and the (Q321) Left Front Window Express Down Driver circuit
4. Turn the ignition on.
5. Trip the driver door latch to the closed position.
6. Operate the driver window switch up and down several times while observing the test light.

Does the test light illuminate brightly when the switch is pressed in both directions? With the express up window, the test light may only flash momentarily.

Yes

- Replace the Driver Window Motor (regulator).
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Go To 3

3. (Q321) LEFT FRONT WINDOW EXPRESS DOWN DRIVER CIRCUIT OPEN




1. Turn the ignition off.
2. Disconnect the Driver Door Module C4 connector.
3. Measure the resistance of the (Q321) Left Front Window Express Down Driver circuit between the C4 module connector and the motor connector.

Is the resistance below 2.0 ohms?

No

- Repair the (Q321) Left Front Window Express Down Driver circuit for an open.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

Yes

- Go To 4

4. (Q311) LEFT FRONT WINDOW EXPRESS UP DRIVER CIRCUIT OPEN




1. Measure the resistance of the (Q311) Left Front Window Express Up Driver circuit between the C4 module connector and the motor connector.

Is the resistance below 2.0 ohms?

No

- Repair the (Q311) Left Front Window Express Up Driver circuit for an open.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

Yes

- Replace the Driver Door Module ion accordance with the Service Information.
- Perform the BODY VERIFICATION TEST. Body Verification Test.