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 B3922 00: Front Wiper Function Select CircuitDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
WIPER SPEED Relay B+ | 1, 2 | 1, 2 | -- | -- |
Windshield Wiper Switch Signal | B3922 00 | 1 | 1 | -- |
Windshield Wiper Switch High Signal | 4 | 2 | 2 | -- |
Windshield Wiper Motor Park Switch Signal | 3 | 3 | -- | -- |
WIPER CONTROL Relay Control | B3715 02 | 1 | 4 | -- |
WIPER SPEED Relay Control | 4 | 2 | B3875 00 | -- |
Windshield Wiper Motor High Speed Control | 2 | 2 | 4 | -- |
Windshield Wiper Motor Low Speed Control | 1 | 1 | 4 | -- |
Windshield Wiper Switch Low Reference | -- | 1, 2 | 1, 2 | -- |
Windshield Wiper Motor Ground | -- | 1, 2, 3 | -- | -- |
WIPER CONTROL Relay Ground | -- | 1 | -- | -- |
1. Delay or Low Speed Wipers Inoperative 2. High Speed Wipers Inoperative 3. Wipers Do Not Park 4. Wipers Always ON | ||||
Circuit/System Description
The body control module (BCM) controls the wiper motor based on input from the windshield wiper washer switch. The BCM monitors the wiper washer switch through three separate signal circuits and a ground circuit. The windshield wiper switch high signal circuit is used to determine high speed wiper operation, the windshield wiper switch low signal is used to determine low speed, intermittent, and mist operation through the use of a resistor ladder, and windshield washer switch signal circuit is used to determine washer operation.
Conditions for Running the DTC
The ignition switch is in the ON position.
Conditions for Setting the DTC
The BCM detects a short to ground on the windshield wiper switch low signal circuit.
Action Taken When the DTC Sets
| • | The BCM will not activate the low speed output. |
| • | The windshield wipers will only operate in the high speed mode. |
Conditions for Clearing the DTC
| • | The DTC will clear the current status when the condition for setting the fault is corrected. |
| • | A history DTC will clear after 50 consecutive ignition cycles without a fault present. |
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Wiper/Washer System Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Ignition ON, observe the scan tool Windshield Wiper Switch parameter while rotating the wiper switch. The reading should change between Off, Intermittent, and Low.
Circuit/System Testing
- Ignition OFF, disconnect the X3 harness connector at the turn signal multifunction switch.
- Ignition ON, verify the scan tool Windshield Wiper Switch parameter is OFF.
- If all circuits test normal, test or replace the turn signal multifunction switch.
| ⇒ | If not the specified value, test the signal circuit terminal N for a short to ground. If the circuit tests normal, replace the BCM. |
Component Testing
Turn Signal Multifunction Switch
- Ignition OFF, disconnect the X1 harness connector at the turn signal multifunction switch.
- With the wiper switch in the HIGH position, test for less than 2 ohms between the low reference terminal M and the signal terminal K.
- While cycling the wiper switch through each delay and speed position, test for the specified resistance between the low reference terminal M and the signal terminal N.
| ⇒ | If greater than the specified range, replace the windshield wiper washer switch. |
Important: If the switch tests open in any switch position other than Off, test the signal circuits for a short to voltage before replacing the switch.
Switch Position | Resistance |
|---|---|
Off | Infinite |
Mist | 300-364 Ω |
Delay 1 | 3.48k-4.25k Ω |
Delay 2 | 2.52k-3.08k Ω |
Delay 3 | 1.78k-2.18k Ω |
Delay 4 | 1.17k-1.44k Ω |
Delay 5 | 697-851 Ω |
Low | 300-364 Ω |
High | 300-364 Ω |
| ⇒ | If any switch position is not within the specified range, replace the turn signal multifunction switch. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for BCM replacement, setup, and programming |
