2010 Cadillac Truck SRX FWD V6-3.0L Page 351

2010 Cadillac Truck SRX FWD V6-3.0L Page 351

7. Test for 2.6-3.2 kohm between the K9 Body Control Module 12 V reference circuit harness connector X3 terminal 4 and the K9 Body

Control Module signal circuit harness terminal 9 X1.

瀚慖f not within the specified range, test the 12 V reference circuit and the signal circuit for an open/high resistance. If the circuits test

normal, replace the S30 Headlamp Switch.

8. If all circuits test normal, replace the K9 Body Control Module.

Component Testing

Static Test

Ignition OFF, disconnect the harness connector at the S30 Headlamp Switch. Press and hold the front fog lamp switch button, test for 2.6-3.2 kohm

at the S30 Headlamp Switch terminal 1 and terminal 12.

If not within the specified range replace the S30 Headlamp Switch.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Headlamp Switch Replacement (See: Lighting and Horns/Headlamp/Headlamp Switch/Service and Repair)

* Control Module References (See: Testing and Inspection/Programming and Relearning)for BCM replacement, setup and programming

B370A

DTC B370A

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptor

DTC B370A 39

- Rain Sensor Internal Malfunction

Diagnostic Fault Information

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 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 a fault occurs at any time between the windshield outside moisture sensor and BCM, the BCM will use the inputs from the turn

signal/multifunction switch in the delay positions to operate the windshield wiper motor at continuous variable delay intervals.

Conditions for Running the DTC

* Ignition ON.

* The system voltage is between 9-16 V.

Conditions for Setting the DTC

The BCM receives an invalid signal from the windshield outside moisture sensor.

Action Taken When the DTC Sets