DTC B370C or B370D. Holden WM Sedan 2007

For 1990-2009 cars only

Makes 🢒 Holden 🢒 2007 🢒 WM Sedan 🢒 Safety and Security 🢒 Supplemental Inflatable Restraints 🢒 DTC B370C or B370D

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 B370C Rain Sensor Intensity Signal Circuit

DTC B370D Rain Sensor Module Control Circuit

Diagnostic Fault Information

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

With the windshield wiper switch set in the AUTOMATIC position, when the rain sensor detects the presence of moisture on the windshield, it sends a signal to the Body Control Module (BCM). Upon receiving the signal, the BCM turns on the windshield wipers. The wipers will continue working until the rain sensor no longer detects moisture on the windshield.

Conditions for Running the DTC

•	The ignition is ON.

•	The windshield wiper switch is in the AUTOMATIC position.

Conditions for Setting the DTC

The BCM detects a fault in the rain senor circuit.

Action Taken When the DTC Sets

•	The automatic wipers will not operate when the moisture hits the windshield..

•	The windshield wipers will only operate by using the wiper switch.

Conditions for Clearing the DTC

•	The condition for setting the DTC is no longer present.

•	The history DTC will clear after 50 fault-free ignition cycles.

Reference Information

Schematic Reference

Wiper/Washer Schematics

Connector End View Reference

Component Connector End Views

Electrical Information Reference

•	Circuit Testing

•	Connector Repairs

•	Testing for Intermittent Conditions and Poor Connections

•	Wiring Repairs

Scan Tool Reference

Control Module References

Circuit/System Testing

Disconnect the A121 Rain Sensor connector.
Using a DMM test the Rain sensor; power, ground, sensor 1 and sensor 2 for resistance.

⇒	If greater than 5 ohms, repair or replace the effected circuit(s).

⇒	If less than 5 ohms, replace the Rain sensor.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

•	Windshield Wiper and Washer Switch Replacement

•	Control Module References for BCM replacement, setup, and programming.