For 1990-2009 cars

### 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 B3637 A5: Rear Washer Switch Stuck
DTC B3638 A5: : Front Washer Switch Stuck
DTC B3639 A5: : Wiper Switch Up F 1 Stuck
DTC B3640 A5: : Wiper Switch Up F 2 Stuck
DTC B3641 A5: : Wiper Switch Down F 1 Stuck
DTC B3642 A5: : Wiper Switch Down F 2 Stuck

### Circuit/System Description

The Steering Wheel Module (SWM) contain switches that control the Front and rear wiper and washer functions. These switches are integrated within the SWM and are not serviceable as a separate component. The SWM monitors these switch inputs for internal faults and set DTC B3637 A5 through DTC B3642 A5 if any are detected.

### Conditions for Running the DTC

The system voltage is 9-18 volts.

### Conditions for Setting the DTC

The SWM detects multiple or simultaneous switch inputs from a wiper or washer switch for more than one minute that would indicate a stuck switch.

### Action Taken When the DTC Sets

The SWM ignores inputs from the malfunctioning switch.

### 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 40 ignition cycles.

### Reference Information

#### Schematic Reference

Wiper/Washer Schematics

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

Wiper/Washer System Description and Operation

or

Rear Wiper/Washer System Description and Operation

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### Scan Tool Reference

Control Module References for scan tool information

### Circuit/System Verification

Clear all DTCs and operate the integrated switches at SWM within the Conditions for Running the DTC. The DTC should not set.

⇒ | If the DTC sets, replace the SWM.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References

For Steering Wheel Module replacement, setup, and programming.