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 B370A 00: Rain Sensor Maifunction

### Circuit/System Description

The rain sensor module has internal logic that monitors it's communication with the underhood electrical center (UEC). If the the rain sensor can not communicate with the UEC a code B370A is set.

### Conditions for Running the DTC

• | The system voltage is 9-18 volts.

• | Ignition on.

### Conditions for Setting the DTC

Rain sensor is activated and has communication failure with UEC.

### Action Taken When the DTC Sets

Auto Rain senceing wipers are disabled, wipers work normally in all manual modes.

### 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

Wiper/Washer Schematics

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

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 wipers in Conditions for Running the DTC. The DTC should not set.

⇒ | If the DTC sets, replace the rain sensor.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Windshield Outside Moisture Sensor Replacement