B3820

DTC B3820 or B3823

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

DTC DESCRIPTORS

DTC B3820 04
Left Rear Window Down Control Circuit

DTC B3823 04
Right Rear Window Down Control Circuit

CIRCUIT/SYSTEM DESCRIPTION
The rear door windows can be raised or lowered by the appropriate rear passenger door switch or the driver window switch.

CONDITIONS FOR RUNNING THE DTC
Battery voltage must be between 9-16 volts.

CONDITIONS FOR SETTING THE DTC

B3820 04
The left rear window down circuit is open

B3823 04
The right rear window down circuit is open.

ACTION TAKEN WHEN THE DTC SETS
- The BCM stores the DTC to memory.
- The BCM will not attempt left/right rear window down operation.

CONDITIONS FOR CLEARING THE DTC
- This DTC will change from current to history when the fault is no longer present.
- A history DTC will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present.
- The technician issues a scan tool CLEAR DTCs command.

CIRCUIT/SYSTEM VERIFICATION
Command the appropriate rear door window DOWN and UP with a scan tool. The appropriate rear door window should go DOWN and UP as commanded.

CIRCUIT/SYSTEM TESTING
1. Ignition OFF, disconnect the window master switch down circuit terminal C at the appropriate the appropriate rear window switch.
2. Ignition ON, connect a test lamp between the appropriate window master switch down circuit terminal C and ground.
3. Command the rear window DOWN with a scan tool. The test lamp should illuminate while commanding the DOWN state.
- If the lamp is always OFF, test the control circuit for an open/high resistance, if the circuit tests normal, replace the body control module (BCM).
4. If all circuits test normal, replace the appropriate rear window switch.

REPAIR INSTRUCTIONS
Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests
- Rear Side Door Window Switch Replacement
- Programming and Relearning Programming and Relearning