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 Descriptors
DTC B3821 00: Left Rear Window Relay Power CircuitDTC B3824 00: Right Rear Window Relay Power Circuit
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Driver Door Module B+ | 1, 3 | 1 | -- | -- |
LR Window Switch B+ | 1, 3 | 3 | -- | -- |
Passenger Door Module B+ | 2, 4 | 2 | -- | -- |
RR Window Switch B+ | 2, 4 | 4 | -- | -- |
Power Window Switch Right Rear Down Signal | B3823 00 | B3823 00 | B3823 00 | -- |
Power Window Switch Right Rear Up Signal | B3822 00 | B3822 00 | B3822 00 | -- |
Power Window Switch Left Rear Down Signal | B3820 00 | B3820 00 | B3820 00 | -- |
Power Window Switch Left Rear Up Signal | B3819 00 | B3819 00 | B3819 00 | -- |
Power Window Lockout Left Rear Control | B3821 00 | B3821 00 | B3821 00 | -- |
Power Window Lockout Right Rear Control | B3824 00 | B3824 00 | B3824 00 | -- |
LR Window Motor Control | 3 | 3 | 3 | -- |
Passenger Window Motor Control | B3205 00 | B3205 0B | B3205 00 | -- |
RR Window Motor Control | 4 | 4 | 4 | -- |
Driver Window Motor Control | B3205 00 | B3205 0B | B3205 00 | -- |
LR Window Switch Ground | -- | 3 | 3 | -- |
RR Window Switch Ground | -- | 4 | 4 | -- |
RR Window Switch Ground | -- | 4 | 4 | -- |
Driver Door Module Ground | -- | 1 | 1 | -- |
Passenger Door Module Ground | -- | 2 | 2 | -- |
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 module (DDM).
Conditions for Running the DTC
| • | Battery voltage is between 9-16 volts. |
| • | The ignition is ON. |
Conditions for Setting the DTC
B3821 00
The BCM detects a fault in the left rear window lockout circuit.
B3824 00
The BCM detects a fault in the right rear window lockout circuit.
Action Taken When the DTC Sets
The left or right 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
Power Door Systems Connector End Views
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.
- Observe the scan tool Window Lockout Switch parameter while pressing and depressing the window lockout switch on the driver master control. The reading should change between ON and OFF.
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the appropriate rear window switch.
- Enable the rear windows by using the window lockout switch.
- Ignition ON, test for more than 10 volts between the control circuit terminal D and ground.
- Disable the rear windows by using the window lockout switch.
- Test for 0 volts between the control circuit terminal D and ground.
- If all circuits test normal, replace the rear window switch.
| ⇒ | 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. |
| ⇒ | If greater than the specified value, test the control circuit for a short to voltage. 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, setup and programming |
