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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 indicator Signal

2

2

2

--

Rain Sensor Ground

--

1

--

--

1. Rain Sensor Malfunction

2. Rain Sense indicator Malfunction

Circuit/System Description

B+ voltage is supplied to the windscreen outside moisture sensor. Whenever the ignition is ON, or accessory positions, the body control module (BCM), sends the indicator/multifunction switch status by using a pulse width modulated (PWM) signal. When a wipe cycle is needed, the windscreen outside moisture sensor sends a PWM voltage signal to the BCM, requesting the wiper operation. The BCM commands the windscreen wiper motor wipe cycles. If at anytime a fault occurs between the windscreen outside moisture sensor and BCM, the BCM will use the inputs from the indicator/multifunction switch in the delay positions to operate the windscreen 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, S82 Windscreen Wiper/Washer 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 .

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 value, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify that a test lamp illuminates between B+ voltage circuit terminal 1 and ground.
    4. ⇒If the test lamp does not illuminate, test the B+ voltage circuit for a short to ground or an open/high resistance.
  4. Ignition ON, test for 4-12 V between the signal circuit terminal 3 and ground.
    5. ⇒If less than the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.
  5. If all circuits test normal, replace the B117 Rain Sensor.

Rain Sensor Indicator Malfunction

  1. Ignition ON, command the All Indicators test ON and OFF with the scan tool, verify that the rain sensor indicator turns ON and OFF.
    2. ⇒If the rain sensor indicator stays always on or always off, replace the P16 Instrument Cluster.
  2. If the rain sensor indicator changes between ON and OFF, replace the K9 Body Control Module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Windscreen Outside Moisture Sensor Replacement
    • Control Module References for BCM or the Instrument Panel Cluster replacement, setup, and programming
   


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