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+ | U0199 00 | U0199 00 | -- | -- |
LR Window Switch B+ | 1, 3 | 3 | -- | -- |
Front Passenger Door Module B+ | U0200 00 | U0200 00 | -- | -- |
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 | -- | U0199 00 | U0199 00 | -- |
Front Passenger Door Module Ground | -- | U0200 00 | U0200 00 | -- |
1. Driver Window Malfunction 2. Passenger Window Malfunction 3. Left Rear Window Malfunction 4. Right Rear Window Malfunction | ||||
Circuit/System Description
The rear window switches continuously monitor the enable/disable signal voltage sent by the body control module (BCM) and compares the signal voltage to the B+ voltage. If the rear window lockout function is enabled, the signal is at or near B+ voltage allowing for normal rear window switch function and when disabled, the signal voltage drops by approximately 0.5 volts and the rear window switches will disable the rear window switch function. The rear windows will then 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 from the door switch and 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
Description and Operation
Power Windows Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
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 function.
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the appropriate rear window switch.
- Ignition ON, verify the scan tool LR Window Enable Cmd. and RR Window Enable Cmd. parameters are On.
- Test for greater than 9 volts between the control circuit terminal D and ground.
- If all circuits test normal, replace the rear window switch.
| ⇒ | If not the specified value, press the window lockout switch on the driver master control. |
| ⇒ | 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, setup and programming |
