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 |
|---|---|---|---|---|
WPR HI Relay B+ | 1, 2 | 1, 2 | -- | -- |
Windshield Wiper Switch Signal | B3922 00 | B3922 00 | B3922 00 | -- |
Windshield Wiper Switch High Signal | 4 | 2 | 2 | -- |
Windshield Wiper Motor Park Switch Signal | 3 | 3 | -- | -- |
WPR Relay Control | B3715 00 | B3715 00 | B3715 00 | -- |
WPR HI Relay Control | B3875 00 | B3875 00 | 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 | -- | -- |
WPR 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) monitors the windshield wiper switch low signal circuit. When the wiper switch is place in the low position, battery voltage is applied through the switch contacts, a series of resistors, and the wiper switch low signal circuit to the BCM. The BCM then applies battery voltage through the wiper relay control circuit to energize the WPR relay. When energized, battery voltage from the WPR fuse is applied through the switch side of the WPR relay then through the switch side of the WPR HI relay to the windshield wiper motor.
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, open/high resistance or short to voltage 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, Low and High.
Circuit/System Testing
- Ignition OFF, disconnect the windshield wiper/washer switch harness connector at the windshield wiper/washer switch.
- Ignition ON, verify the scan tool Windshield Wiper Switch parameter is not Switch Fault.
- If all circuits test normal, test or replace the windshield wiper/washer switch.
| ⇒ | If Switch Fault, test the windshield wiper switch low signal circuit terminal H for a short to ground. If the circuit tests normal, replace the BCM. |
Component Testing
Windshield Wiper/Washer Switch
- With the ignition OFF, disconnect the harness connector at the turn windshield wiper/washer switch.
- Test the resistance between terminals H and M. Rotate the wiper switch and compare the resistance readings to the values in the Windshield Wiper Switch Values table below for MIST, each DELAY and LOW speed.
- Test for infinite resistance between terminals H and K while rotating the wiper switch to MIST, each DELAY and LOW speed positions.
- Test for less than 5 ohms of resistance with the wiper switch in the High speed position.
- Test for infinite resistance between terminals H and J while rotating the wiper switch to MIST, each DELAY and LOW speed positions.
- Test for less than 5 ohm of resistance while pressing the WASHER switch.
| ⇒ | If the resistance is not within the specified range, replace the turn signal/multifunction switch. |
| ⇒ | If the less than infinite, replace the turn signal/multifunction switch. |
| ⇒ | If greater than 5 ohm, replace the turn signal/multifunction switch. |
| ⇒ | If less than infinite, replace the turn signal/multifunction switch. |
| ⇒ | If greater than 5 ohm, replace the turn signal/multifunction switch. |
Important: If the switch tests open in any switch position other than Off, test the wiper/washer switch 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 |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for BCM replacement, setup, and programming |
