2010 Cadillac CTS Sedan AWD V6-3.6L Page 598

2010 Cadillac CTS Sedan AWD V6-3.6L Page 598

Circuit/System Description

The body control module (BCM) monitors the steering wheel control signal circuit voltage. If the voltage level is too high, damage may result in

the system. When a high voltage condition is detected, the BCM will ignore the switch command.

Conditions for Running the DTC

* Battery voltage is between 9-16 volts

* The ignition is ON.

Conditions for Setting the DTC

The BCM detects a short to ground in the steering wheel control switch signal circuit.

Action Taken When the DTC Sets

The BCM will ignore switch inputs.

Conditions for Clearing the DTC

* The condition responsible for setting the DTC no longer exists.

* A history DTC will clear once 100 consecutive malfunction free ignition cycles have occurred.

Reference Information

Schematic Reference

Steering Wheel Secondary/Configurable Control Schematics (See: Accessories and Optional Equipment/Diagrams/Electrical Diagrams/Steering

Wheel Secondary/Configurable Control Schematics)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

Steering Wheel Controls Description and Operation (See: Accessories and Optional Equipment/Description and Operation/Steering Wheel

Controls Description and Operation)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit

Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Wiring Repairs/Wiring Repairs)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Verification

Ignition ON, observe the scan tool SWC Bank 1 status while pressing and releasing the switches. The reading should be SW1-SW10 identifying the

switch pressed, and Idle when released.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the left and right steering wheel control switches.

2. Ignition ON, test for B+ between the voltage reference circuit terminal 1 and ground.

瀚慖f less than the specified value, test the voltage reference circuit for a short to ground or an open/high resistance. If the circuit tests

normal, replace the BCM.

3. Test for B+ between the voltage reference circuit terminal 1 and the signal circuit terminals listed below:

* Steering wheel control switch signal circuit terminal 6 - left switch

* Steering wheel control switch signal circuit terminal 2 - right switch