SAAB WIS ONLINE

Rain Sensor Malfunction

Rain Sensor Malfunction

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.


Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
Rain Sensor B+ 1 1 - -
Rain Sensor Signal B370A 39 B370A 39 B370A 39 B370A 39
Rain Sensor Ground - 1 - -
1. Rain Sensor Malfunction


Circuit/System Description

B+ voltage is supplied to the windshield outside moisture sensor. Whenever the ignition is ON, or in accessory positions, the body control module (BCM), sends the windshield wiper/washer switch status by using a pulse width modulated (PWM) signal. When a wipe cycle is needed, the windshield outside moisture sensor sends a PWM voltage signal to the BCM, initiating the wiper operation. The BCM commands the windshield wiper motor wipe cycles. If at anytime a fault occurs between the windshield outside moisture sensor and BCM, the BCM will use the inputs from the windshield wiper/washer switch in the delay positions to operate the windshield wiper motor at continuous variable delay intervals.

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

Ignition ON, S802 windshield wiper/washer switch in the low position. Spray water on the windshield. The windshield wipers should operate at low speed.

If the windshield wipers do not operate, refer to Windshield Wiper System Malfunction .

Circuit/System Testing


Rain Sensor Malfunction

1. Ignition OFF, disconnect the harness connector at the B117 rain sensor.

2. Test for less than 5 Ω between the ground circuit terminal 2 and ground.

3. If greater than the specified range, test the ground circuit for an open/high resistance.

4. Ignition ON, verify that a test lamp illuminates between B+ voltage circuit terminal 1 and ground.

5. If the test lamp does not illuminate, test the B+ voltage circuit for a short to ground or an open/high resistance.

6. If all circuits test normal, replace the B117 rain sensor.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.


• Windshield Outside Moisture Sensor Replacement

• Control Module References for BCM or the Instrument Panel Cluster replacement, setup, and programming