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 B3820 00: Left Rear Window Down Control 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) monitors the window UP/DOWN command from the driver door switch (DDS). When the rear window UP or DOWN command is received, the BCM sends a signal to the appropriate rear window switch. The rear window switches continuously monitor the up and down signal circuits, if no function is being commanded, the signal voltage is at approximately B+ voltage. If the UP or DOWN function is commanded, the BCM signal voltage drops approximately 0.5 volts and the appropriate rear window switch will then command the window in the UP or DOWN direction.
Conditions for Running the DTC
| • | Battery voltage is between 9-16 volts. |
| • | The ignition switch is in the ON position. |
| • | The BCM has attempted to energize the left rear power window down relay control circuit. |
Conditions for Setting the DTC
The BCM detects a fault in the left rear window down circuit
Action Taken When the DTC Sets
The left rear power window will be inoperative from the driver master control.
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
Command the left rear door window UP and DOWN with a scan tool. The left rear door window should perform the UP and DOWN function.
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the left rear window switch.
- Ignition ON, test for greater than 9 volts between the signal circuit terminal C and ground while commanding the left rear window DOWN by using the LR window switch on the driver master control.
- If the circuit tests normal, replace the left rear window switch.
| ⇒ | If less than the specified range, test the signal 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 |
