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 Window Motor B+ | U1511 00 | U1511 00 | -- | B320A 4B |
LR Window Switch B+ | 3 | 3 | -- | -- |
Passenger Window Motor B+ | U1511 00 | U1511 00 | -- | B320A 4B |
RR Window Switch B+ | 4 | 4 | -- | -- |
Driver Window Motor Serial Data | U1500 02 | U1500 02 | U1500 02 | B320A 4B |
Passenger Window Motor Serial Data | U1500 02, U1511 00 | U1511 00 | U1511 00 | B320A 4B |
LR Window Motor Control | 3 | 3 | 3 | -- |
RR Window Motor Control | 4 | 4 | 4 | -- |
Window Master Switch LR Down Control | B3820 00 | B3820 00 | B3820 00 | -- |
LR Window Master Switch Lockout Control | B3821 00 | B3821 00 | B3821 00 | -- |
RR Window Master Switch Lockout Control | B3824 00 | B3824 00 | 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 | -- |
LR Window Switch Ground | -- | 3 | 3 | -- |
Driver Window Motor Ground | -- | U1511 00 | 1 | B320A 4B |
Passenger Window Motor Ground | -- | U1511 00 | 2 | B320A 42, B320A 4B |
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 lockout command from the driver door module (DDM). When the rear window switch operation is authorized, the BCM signal voltage drops approximately 5 volts to the rear window switches allowing for normal window operation from the rear switches. If the rear window lockout function is commanded, the BCM signal voltage is at B+ voltage which disables the rear window switches and the rear windows will only operate when the BCM receives a command from the driver master control.
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
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 appropriate rear door window UP and DOWN by using the rear door window switch. The rear door window should perform UP and DOWN function.
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the appropriate rear window switch.
- Ignition 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.
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, setup, and programming |
