Configurable Customer Control System Cadillac SRX II

Scheme 2

DIAGNOSTIC CODE INDEX

DIAGNOSTIC CODE INDEX

Diagnostic Instructions

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Diagnostic Fault Information

Circuit/System Description

The body control module (BCM) supplies voltage to the steering wheel control switches and monitors the return signal. Each switch state is associated to a set resistance value and when pressed a specific voltage drop occurs across the resistor unique to the switch. The BCM identifies the switch selection and activates the feature.

Conditions for Running the DTC

1. The system voltage is between 9-16 V.
2. The ignition is ON.

Conditions for Setting the DTC

1. The BCM detects a short to voltage on the signal circuit.
2. The above condition is present for greater than 30 s.

Action Taken When the DTC Sets

The BCM will ignore switch inputs.

Conditions for Clearing the DTC

1. The condition responsible for setting the DTC no longer exists.
2. A history DTC will clear once 100 consecutive malfunction free ignition cycles have occurred.

Reference Information

Schematic Reference

Steering Wheel Secondary/Configurable Control Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Steering Wheel Controls Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
4. «Wiring Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the S70L Steering Wheel Controls Switch - Left.
2. Test for less than 10 ohms between the signal circuit terminal 2 and ground. If greater than the specified value, test the signal circuits for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.
3. Ignition ON, test for greater than 11 V between the 12 V reference circuit terminal 1 and ground. If less than the specified value, test the 12 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.
4. Ignition OFF, disconnect the X3 harness connector at the K9 Body Control Module.
5. Test for infinite resistance between the signal circuit terminal 9 X3 and ground. If less than the specified value, test the signal circuit for a short to ground.
6. If all circuits test normal, test or replace the S70L Steering Wheel Controls Switch - Left.

Left Steering Wheel Switch Test

1. Disconnect the harness connector at the S70L Steering Wheel Controls Switch - Left.
2. Turn the cruise control switch in the ON position.
3. Test the resistance between the terminals 1 and 2. If any of the resistance measurements for the individual switches are not within the specified resistance values, replace the S70L Steering Wheel Controls Switch - Left.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Radio Control Switch Replacement - Steering Wheel»(/cadillac/srx/ii-2009-2012/remont/entertainment-systems/#cellular-systems-entertainment-systems-navigation-systems)
2. «Control Module References»(/cadillac/srx/ii-2009-2012/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, setup, and programming

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

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.

1. Battery voltage is between 9-16 V.
2. The ignition is ON.

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

The BCM will ignore switch inputs.

1. The condition responsible for setting the DTC no longer exists.
2. A history DTC will clear once 100 consecutive malfunction free ignition cycles have occurred.

Schematic Reference

Steering Wheel Secondary/Configurable Control Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Steering Wheel Controls Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
4. «Wiring Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. Ignition OFF, disconnect the harness connector at the S70L Steering Wheel Controls Switch - Left and the S70R Steering Wheel Controls Switch - Right.
2. Ignition ON, test for B+ between the voltage reference circuit terminal 1 and ground. If 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 K9 Body Control Module.
3. Test for B+ between the voltage reference circuit terminal 1 and the signal circuit terminals listed below: Signal circuit terminal 6 - S70L Steering Wheel Controls Switch - Left Signal circuit terminal 2 - S70R Steering Wheel Controls Switch - Right If less than the specified value, test the signal circuits for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.
4. Ignition OFF, disconnect the X3 harness connector at the K9 Body Control Module.
5. Test for infinite resistance between the signal circuit terminals listed below and ground. Signal circuit terminal 6 - S70L Steering Wheel Controls Switch - Left Signal circuit terminal 2 - S70R Steering Wheel Controls Switch - Right If less than the specified value, test the signal circuit for a short to ground.
6. Ignition ON, test for less than 0.3 V between the signal circuit terminal 5 at the S70R Steering Wheel Controls Switch - Right and ground. If greater than the specified range, test the signal circuit for a short to voltage.
7. Test for infinite resistance between the signal circuit terminal 5 at the S70R Steering Wheel Controls Switch - Right and ground. If not the specified value, test the signal circuit for a short to ground.
8. Test for less than 5 ohms between the signal circuit terminal 5 at the S70R Steering Wheel Controls Switch - Right and the signal circuit terminal 5 at the S70L Steering Wheel Controls Switch - Left. If greater than the specified range, test the signal circuit for an open/high resistance.
9. If all circuits test normal, test or replace the S70R Steering Wheel Controls Switch - Right or S70L Steering Wheel Controls Switch - Left.

Component Testing

Static Test

Right Steering Wheel Switch

1. Disconnect the harness connector at the S70R Steering Wheel Controls Switch - Right.
2. Test the resistance between the terminals 1 and 2 of the S70R Steering Wheel Controls Switch - Right. If any of the resistance measurements for the individual switches are not within the specified resistance values, replace the S70R Steering Wheel Controls Switch - Right.

Left Steering Wheel Switch

1. Disconnect the harness connector at the S70L Steering Wheel Controls Switch - Left.
2. Test the resistance between the terminals 5 and 6 of the S70L Steering Wheel Controls Switch - Left. If any of the resistance measurements for the individual switches are not within the specified resistance values, replace the S70R Steering Wheel Controls Switch - Right.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Radio Control Switch Replacement - Steering Wheel»(/cadillac/srx/ii-2009-2012/remont/entertainment-systems/#cellular-systems-entertainment-systems-navigation-systems)
2. «Control Module References»(/cadillac/srx/ii-2009-2012/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, setup, and programming

Symptoms - Secondary and Configurable Customer Controls

Note. The following steps must be completed before using the symptom tables.

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) before using the symptom tables in order to verify that all of the following are true: There are no DTCs set. The control modules can communicate via the serial data link.
2. Review the system description and operation in order to familiarize yourself with the system functions. Refer to «Steering Wheel Controls Description and Operation»(/cadillac/srx/ii-2009-2012/remont/memory-modules/#configurable-customer-control-system__steering-wheel-controls-description-and-operation) .

Visual/Physical Inspection

1. Inspect for aftermarket devices which could affect the operation of the steering wheel controls. Refer to «Checking Aftermarket Accessories»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__checking-aftermarket-accessories) .
2. Inspect the easily accessible or visible system components, for obvious damage or conditions, which could cause the symptom.

Intermittent

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections .

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom

Refer to Steering Wheel Controls Malfunction in order to diagnose the symptom.

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The body control module (BCM) supplies voltage to the audio steering wheel control switches and monitors the return signal. Each switch state is associated to a set resistance value and when pressed a specific voltage drop occurs across the resistor unique to the switch. The BCM identifies the switch selection and activates the feature.

Diagnostic Aids

1. This diagnostic is for the audio steering wheel controls.
2. Before diagnosis of the steering wheel controls, ensure the primary controls of the associated component are functioning properly.
3. If a single switch function is inoperative, test the suspect switch. Refer to «Component Testing»(/cadillac/srx/ii-2009-2012/remont/memory-modules/#configurable-customer-control-system) .

Schematic Reference

Steering Wheel Secondary/Configurable Control Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Steering Wheel Controls Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
4. «Wiring Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. Ignition OFF, disconnect the harness connector at the S70L Steering Wheel Controls Switch - Left and the S70R Steering Wheel Controls Switch - Right.
2. Ignition ON, test for B+ between the voltage reference circuit terminal 1 and ground. If 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 K9 Body Control Module.
3. Test for B+ between the voltage reference circuit terminal 1 and the signal circuit terminals listed below: Signal circuit terminal 6 - S70L Steering Wheel Controls Switch - Left Signal circuit terminal 2 - S70R Steering Wheel Controls Switch - Right If less than the specified value, test the signal circuits for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.
4. Ignition OFF, disconnect the X3 harness connector at the K9 Body Control Module.
5. Test for infinite resistance between the signal circuit terminals listed below and ground. Signal circuit terminal 6 - S70L Steering Wheel Controls Switch - Left Signal circuit terminal 2 - S70R Steering Wheel Controls Switch - Right If less than the specified value, test the signal circuit for a short to ground.
6. Ignition ON, test for less than 0.3V between the signal circuit terminal 5 at the S70R Steering Wheel Controls Switch - Right and ground. If greater than the specified range, test the signal circuit for a short to voltage.
7. Test for infinite resistance between the signal circuit terminal 5 at the S70R Steering Wheel Controls Switch - Right and ground. If not the specified value, test the signal circuit for a short to ground.
8. Test for less than 5 ohms between the signal circuit terminal 5 at the S70R Steering Wheel Controls Switch - Right and the signal circuit terminal 5 at the S70L Steering Wheel Controls Switch - Left. If greater than the specified range, test the signal circuit for an open/high resistance.
9. If all circuits test normal, test or replace the S70R Steering Wheel Controls Switch - Right or S70L Steering Wheel Controls Switch - Left.

Static Test

1. Disconnect the harness connector at the S70R Steering Wheel Controls Switch - Right.
2. Test the resistance between the terminals 1 and 2 of the S70R Steering Wheel Controls Switch - Right. If any of the resistance measurements for the individual switches are not within the specified resistance values, replace the S70R Steering Wheel Controls Switch - Right.

1. Disconnect the harness connector at the S70L Steering Wheel Controls Switch - Left.
2. Test the resistance between the terminals 5 and 6 of the S70L Steering Wheel Controls Switch - Left. If any of the resistance measurements for the individual switches are not within the specified resistance values, replace the S70R Steering Wheel Controls Switch - Right.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Radio Control Switch Replacement - Steering Wheel»(/cadillac/srx/ii-2009-2012/remont/entertainment-systems/#cellular-systems-entertainment-systems-navigation-systems)
2. «Control Module References»(/cadillac/srx/ii-2009-2012/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, setup, and programming

Steering Wheel Controls Description and Operation

The steering wheel control switches duplicate the function of the primary controls of the associated component, through a network of momentary contact switches and a series of resistors. The body control module (BCM) supplies voltage to the switches and monitors the return signal. When a switch is pressed, a specific voltage drops across the resistor unique to that switch. The BCM identifies the switch selected and sends a serial data message to the component controlled by the switch, activating the feature.

This section is intended to diagnose the circuits between the BCM and the steering wheel control switches. If the primary control for the device is inoperative, refer to the appropriate section for the component the steering wheel control switch is used for.

See also:
• Diagnostic System Check - Vehicle
• Strategy Based Diagnosis
• Diagnostic Procedure Instructions
• Component Connector End Views
• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs
• Control Module References
• Diagnostic Repair Verification
• Radio Control Switch Replacement - Steering Wheel
• Checking Aftermarket Accessories
• DTC B1295
• Steering Wheel Controls Description and Operation