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. |
DTC Descriptor
DTC B3821 00: Left Rear Window Relay Power CircuitDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
DDS B+ | 1 | 1 | -- | -- |
LR Window Switch B+ | 3 | 3 | -- | -- |
PDS B+ | 2 | 2 | -- | -- |
RR Window Switch B+ | 4 | 4 | -- | -- |
LR Window Switch Down Signal | B3820 00 | B3820 00 | B3820 00 | -- |
LR Window Switch Up Signal | B3819 00 | B3819 00 | B3819 00 | -- |
RR Window Switch Down Signal | B3823 00 | B3823 00 | B3823 00 | -- |
RR Window Switch Up Signal | B3822 00 | B3822 00 | B3822 00 | -- |
Passenger Window Motor Control | B3205 00 | B3205 0B | B3205 00 | -- |
Driver Window Motor Control | B3205 00 | B3205 0B | B3205 00 | -- |
LR Window Motor Control | 3 | 3 | 3 | -- |
RR Window Motor Control | 4 | 4 | 4 | -- |
LR Window Switch Lockout Control | B3821 00 | B3821 00 | B3821 00 | -- |
RR Window Switch Lockout Control | B3824 00 | B3824 00 | B3824 00 | -- |
LR Window Switch Ground | -- | 3 | 3 | -- |
RR Window Switch 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 body control module (BCM) supplies voltage to the rear window switches allowing for normal window operation from the rear switches. If the rear window lockout function is enabled, the BCM will not supply voltage to the rear window switches and the rear windows will only operate when the BCM receives a command to operate the appropriate rear window UP or DOWN from the driver door switch (DDS).
Conditions for Running the DTC
| • | Battery voltage is between 9-16 volts. |
| • | The ignition switch is in the ON position. |
Conditions for Setting the DTC
The BCM detects a fault in the left rear window lockout circuit.
Action Taken When the DTC Sets
The left rear power window 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
Connector End View Reference
Window Systems Connector End Views
Power Windows Description and Operation
Power Windows Description and Operation
Electrical Information Reference
Scan Tool Reference
Circuit/System Verification
Ignition ON, command the rear passenger power windows UP and DOWN with a scan tool, the rear passenger power windows should perform the UP and DOWN command.
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the left rear window switch.
- Ignition ON, test for greater than 10 volts between the control circuit terminal D and ground.
- If the circuits test normal replace the left rear window switch.
Important: Check the lockout switch on the driver door switch and verify the rear window switches are enabled.
| ⇒ | If less than the specified range, test the control circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the BCM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for BCM replacement, programming, and setup |
