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3 Door



DTC B1390 (3 Door)

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview)provides an overview of each diagnostic category.



DTC Descriptor
DTC B1390 02
- Comfort Closing Circuit Low Voltage




Diagnostic Fault Information






Circuit/System Description

The front power windows are controlled by the driver window switch, front passenger window switch and the rear fuse block. The driver window switch contains the master power window switch that controls all power window operations. When a power window switch is activated to a desired position, power window switch will send a signal to its respective door window motor to move the window to the desired position. The window motors may also receive a signal from the rear fuse block to globally express down.


Conditions for Running the DTC

* Battery voltage must be between 9-16 volts.
* The ignition is ON.



Conditions for Setting the DTC

The rear fuse block detects a short to ground in the driver window ignition circuit or the passenger window ignition circuit.


Action Taken When the DTC Sets

Both power windows will be inoperative.


Conditions for Clearing the DTC

* The DTC will be current for as long as the fault is present.
* When the fault is no longer present, the DTC will be a history DTC.
* A history DTC will clear after 50 ignition cycles.



Reference Information
Schematic Reference

Moveable Window Schematics ([1][2]Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Power Windows Description and Operation (Power Windows Description and Operation)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning)for scan tool information


Circuit/System Verification

Ignition ON, command each window UP and DOWN using the window switches on the driver master control and by using the passenger door window switch. Each window should perform the UP and DOWN functions from each switch.


Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the driver window switch.
2. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 26 and ground.

• If the test lamp does not illuminate, test the ignition circuit for a short to ground.

3. Connect the harness connector at the driver window switch and disconnect the harness connector at the passenger window switch.
4. Verify that a test lamp illuminates between the ignition circuit terminal 1 and ground.

• If the test lamp does not illuminate, test the ignition circuit for a short to ground.

5. Verify that a test lamp illuminates between the signal circuit terminal 6 and ground while commanding the window UP by using the RF window switch on the driver master control.

• If the test lamp does not illuminate, test the signal circuit for a short to ground. If the circuit tests normal, test or replace the driver window switch.

6. Verify that a test lamp illuminates between the signal circuit terminal 3 and ground while commanding the window DOWN by using the RF window switch on the driver master control.

• If the test lamp does not illuminate, test the signal circuit for a short to ground. If the circuit tests normal, test or replace the driver window switch.

7. Connect the harness connector at the passenger window switch and disconnect the harness connector at the passenger window motor.
8. Connect a test lamp between the control circuit terminal 2 and control circuit terminal 3.
9. Command the window motor UP and DOWN by using the passenger window switch. The test lamp should illuminate while commanding the UP and DOWN state.

• If the test lamp does not illuminate during either of the commands, check both control circuits for a short to ground. If the circuits test normal, test or replace the passenger window switch.

10. Connect the harness connector at the passenger window motor and disconnect the harness connector at the driver window motor.
11. Connect a test lamp between the control circuit terminal 2 and control circuit terminal 3.
12. Command the window motor UP and DOWN by using the driver window switch. The test lamp should illuminate while commanding the UP and DOWN state.

• If the test lamp does not illuminate during either of the commands, check both control circuits for a short to ground. If the circuits test normal, test or replace the driver window switch.

13. If all circuits test normal, replace the rear fuse block.



Component Testing


Driver Window Switch
1. Ignition OFF, disconnect the harness connector at the driver window switch.
2. Test for infinite resistance between the signal terminals 11 and 12 and the ignition terminal 26 with the RF window switch in the INACTIVE position.

• If less than the specified value, replace the driver window switch.

3. Test for less than 2 ohms between the signal terminal 12 and the ignition terminal 26 with the RF window switch in the UP position.

• If greater than the specified range, replace the driver window switch.

4. Test for less than 2 ohms between the signal terminal 11 and the ignition terminal 26 with the RF window switch in the DOWN position.

• If greater than the specified range, replace the driver window switch.

5. Test for infinite resistance between the signal terminals 27 and 28 and the ignition terminal 26 with the driver window switch in the INACTIVE position.

• If less than the specified value, replace the driver window switch.

6. Test for less than 2 ohms between the signal terminal 28 and the ignition terminal 26 with the driver window switch in the UP position.

• If greater than the specified range, replace the driver window switch.

7. Test for less than 2 ohms between the signal terminal 27 and the ignition terminal 26 with the driver window switch in the DOWN position.

• If greater than the specified range, replace the driver window switch




Passenger Window Switch
1. Ignition OFF, disconnect the harness connector at the passenger window switch.
2. Test for infinite resistance between the control terminals 2 and 5 and the ignition terminal 1 with the switch in the INACTIVE position.

• If less than the specified value, replace the passenger window switch.

3. Test for less than 2 ohms between the control terminal 5 and the ignition terminal 1 with the switch in the UP position.

• If greater than the specified range, replace the passenger window switch.

4. Test for less than 2 ohms between the control terminal 2 and the ignition terminal 1 with the switch in the DOWN position.

• If greater than the specified range, replace the passenger window switch.




Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Front Side Door Window Switch Replacement (Front Side Door Window Switch Replacement)
* Front Side Door Window Regulator Motor Replacement (Service and Repair)
* Control Module References (Programming and Relearning)for rear fuse block replacement, setup, and programming


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