Captiva

Moisture Sensing Feature Inoperative

Accessory voltage is supplied to the outside moisture sensor through the BCM. Whenever the ignition is in the run or accessory positions, the BCM sends the wiper/washer switch status using a pulse width modulation (PWM) signal through the outside moisture sensor signal 1 circuit to the outside moisture sensor. When a wipe cycle is needed, the moisture sensor sends a PWM voltage signal through the moisture sensor signal 2 circuit back to the BCM requesting the wiper operation.

The outside moisture sensor uses the moisture sensor signal 2 circuit to command wiper motor wipe cycles and to confirm the moisture sensor signal 1 is being received. If at anytime communication between the outside moisture sensor and BCM is lost, the BCM will use the inputs from the windshield wiper/washer switch in the delay positions to operate the wiper motor at continuous variable delay intervals.

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

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, wiper switch in the LOW position. The windscreen wipers should operate at low speed. If the windscreen wipers do not operate, refer to Windscreen Wiper System Malfunction .

1. Ignition OFF, disconnect the harness connector at the B117 rain sensor.
2. Test for less than 5.0 Ω between the ground circuit terminal 3 and ground.

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

3. Ignition ON, verify that a test lamp illuminates between accessory voltage circuit terminal 4 and ground.

⇒	If the test does not illuminate, test the accessory voltage circuit for a short to ground or an open/high resistance.

4. Ignition ON, test for 4.0-8.5 V between signal circuit terminal 2 and ground.

⇒	If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.

⇒	If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 BCM.

5. Ignition OFF, reconnect the harness connector to the B117 rain sensor.
6. Disconnect the X1 harness connector at the BCM.
7. Ignition ON, test for 5-10 V between the signal circuit terminal 14 and ground.

⇒	If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the B117 rain sensor.

⇒	If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the B117 rain sensor.

8. If all circuits test normal, replace the K9 BCM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.