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 | -- | -- |
Driver Window Motor B+ | U1511 00 | U1511 00 | -- | B320A 4B |
LR Window Switch B+ | 3 | 3 | -- | -- |
Passenger Door Module B+ | U0200 00 | U0200 00 | -- | -- |
Passenger Window Motor B+ | U1511 00 | U1511 00 | -- | B320A 4B |
RR Window Switch B+ | 4 | 4 | 4 | -- |
Driver Window Motor Serial Data | U1511 00 | U1511 00 | 1 | B320A 4B |
Passenger Window Motor Serial Data (AXC) | 2 | 2 | 2 | -- |
LR Window Motor Control | 3 | 3 | 3 | -- |
Passenger Window Motor Control (AXE) | B3205 00 | B3205 0B | B3205 00 | -- |
RR Window Motor Control | 4 | 4 | 4 | -- |
Window Master Switch LR Down Control | B3820 00 | B3820 00 | B3820 00 | -- |
Window Master Switch Lockout Control | B3821 00 or B3824 00 | B3821 00 or B3824 00 | B3821 00 or B3824 00 | -- |
Window Master Switch LR Up Control | B3819 00 | B3819 00 | B3819 00 | -- |
Window Master Switch RR Down Control | B3823 00 | B3823 00 | B3823 00 | -- |
Window Master Switch RR Up Control | B3822 00 | B3822 00 | B3822 00 | -- |
Driver Door Module Ground | -- | U1511 00 | 1 | -- |
LR Window Switch Ground | -- | 3 | 3 | -- |
Passenger Door Module Ground | -- | U1511 00 | 2 | -- |
Passenger Window Motor Ground (AXC) | -- | 2 | 2 | -- |
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 module (DDM).
Conditions for Running the DTC
| • | Battery voltage is between 9-16 volts. |
| • | The ignition switch is in the ON position. |
| • | The window lockout function is disabled. |
Conditions for Setting the DTC
B3821 00
The BCM detects the left rear window lockout control circuit is shorted to ground.
B3824 00
The BCM detects the right rear window lockout circuit is shorted to ground.
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
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 windows UP and DOWN by using the window switches on the driver master control and their respective rear window switches. The rear windows should perform the UP and DOWN function from each switch.
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 |
