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Secondary and Configurable Customer Control System Cadillac CTS II

Memory Modules 2 illustrations ~2274 words

Fastener Tightening Specifications

ApplicationSpecification
MetricEnglish
Steering Wheel Trim Cover Bolt2 N.m18 lb in

Scheme 1

Scheme 1: Steering Wheel Secondary/Configurable Control Schematics
Scheme 1: Steering Wheel Secondary/Configurable Control Schematics

DIAGNOSTIC CODE INDEX

DTCDescription
DTC B1529B1529 03: Device Voltage Reference Output Circuit Voltage Below Threshold B1529 07: Device Voltage Reference Output Circuit Voltage Above Threshold
DTC B3622B3622 07: Steering Wheel Controls Signal Circuit

DIAGNOSTIC CODE INDEX

Diagnostic Instructions

  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/cts/ii-2007-2014/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/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Diagnostic Fault Information

CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
B+ Voltage ReferenceB1529 031B1529 07
Steering Wheel Control Switch Signal11B3622 07
1. Steering Wheel Controls Inoperative

Circuit/System Description

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.

Conditions for Running the DTC

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

Conditions for Setting the DTC

B1529 03

  1. The BCM detects a short to ground in the B+ voltage reference circuit.
  2. The above condition is present for greater than 30 seconds.

B1529 07

  1. The BCM detects a short to voltage in the B+ voltage reference circuit.
  2. The above condition is present for greater than 30 seconds.

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

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References 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. 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 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 If less than the specified value, test the signal circuits for a short to voltage or an open/high resistance. If the circuits test normal, replace the BCM.
  4. Ignition OFF, disconnect the X1 harness connector at the BCM.
  5. Test for infinite resistance between ground 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 If less than the specified value, test the signal circuits for a short to ground.
  6. Ignition ON, test for less than 1 volt between ground and the voltage reference circuit terminal 5 at the left steering wheel control switch. If greater than the specified range, test the voltage reference circuit for a short to voltage
  7. Ignition ON, test for infinite resistance between ground and the voltage reference circuit terminal 5 at the left steering wheel control switch. If not the specified value, test the voltage reference circuit for a short to ground.
  8. Test for less than 1 ohm between the voltage reference circuit terminal 5 at the left steering wheel control switch and the voltage reference circuit terminal 5 at the right steering wheel control switch. If greater than the specified range, test the voltage reference circuit for a an open/high resistance.
  9. If all circuits test normal, test or replace the left or right steering wheel control switch.

Component Testing

  1. Disconnect the harness connector at the right or left steering wheel control switch.
  2. Connect a DMM between terminal 5 and terminal 6 (left switch) or terminal 2 (right switch) of either the left or right steering wheel control switches. If any of the resistance measurements for the individual switches are not within the specified resistance values, replace the left or right steering wheel control switch.
Function SwitchMinimum Resistance ValueMaximum Resistance Value
Source787 Ohms987 Ohms
No Switch PressedO.L.O.L.

Left Steering Wheel Switch Resistance

Function SwitchMinimum Resistance ValueMaximum Resistance Value
Previous534 Ohms734 Ohms
Next898k Ohms1.25k Ohms
Volume Up1.3k Ohms1.5k Ohms
Volume Down1.6k Ohms1.8k Ohms
Mute/Voice Recognition2.6k Ohms3.0k Ohms
No Switch PressedO.L.O.L.

Right Steering Wheel Switch Resistance

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Steering Wheel Control Switch Assembly Replacement»(/cadillac/cts/ii-2007-2014/remont/memory-modules/#secondary-and-configurable-customer-control-system)
  2. «Control Module References»(/cadillac/cts/ii-2007-2014/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/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/cts/ii-2007-2014/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/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
B+ Voltage ReferenceB1529 031B1529 07
Steering Wheel Control Switch Signal11B3622 07
1. Steering Wheel Controls Inoperative

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 volts
  2. The ignition is ON.

The BCM detects a short to ground 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

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

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.

  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. 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 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 If less than the specified value, test the signal circuits for a short to voltage or an open/high resistance. If the circuits test normal, replace the BCM.
  4. Ignition OFF, disconnect the X1 harness connector at the BCM.
  5. Test for infinite resistance between ground 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 If less than the specified value, test the signal circuits for a short to ground.
  6. Ignition ON, test for less than 1 volt between ground and the voltage reference circuit terminal 5 at the left steering wheel control switch. If greater than the specified range, test the voltage reference circuit for a short to voltage
  7. Ignition ON, test for infinite resistance between ground and the voltage reference circuit terminal 5 at the left steering wheel control switch. If not the specified value, test the voltage reference circuit for a short to ground.
  8. Test for less than 1 ohm between the voltage reference circuit terminal 5 at the left steering wheel control switch and the voltage reference circuit terminal 5 at the right steering wheel control switch. If greater than the specified range, test the voltage reference circuit for a an open/high resistance.
  9. If all circuits test normal, test or replace the left or right steering wheel control switch.
  1. Disconnect the harness connector at the right or left steering wheel control switch.
  2. Connect a DMM between terminal 5 and terminal 6 (left switch) or terminal 2 (right switch) of either the left or right steering wheel control switches. If any of the resistance measurements for the individual switches are not within the specified resistance values, replace the left or right steering wheel control switch.
Function SwitchMinimum Resistance ValueMaximum Resistance Value
Source787 Ohms987 Ohms
No Switch PressedO.L.O.L.

Left Steering Wheel Switch Resistance

Function SwitchMinimum Resistance ValueMaximum Resistance Value
Previous534 Ohms734 Ohms
Next898k Ohms1.25k Ohms
Volume Up1.3k Ohms1.5k Ohms
Volume Down1.6k Ohms1.8k Ohms
Mute/Voice Recognition2.6k Ohms3.0k Ohms
No Switch PressedO.L.O.L.

Right Steering Wheel Switch Resistance

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Steering Wheel Control Switch Assembly Replacement»(/cadillac/cts/ii-2007-2014/remont/memory-modules/#secondary-and-configurable-customer-control-system)
  2. «Control Module References»(/cadillac/cts/ii-2007-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, setup, and programming

Symptoms - Secondary and Configurable Customer Controls

IMPORTANTPerform the Diagnostic System Check - Vehicle before using the Symptom Tables in order to verify that all of the following conditions are true: There are no DTCs set. The control modules can communicate via the serial data link. Review the system operation in order to familiarize yourself with the system functions. Refer to Steering Wheel Controls Description and Operation .

Visual/Physical Inspection

  1. Inspect for aftermarket devices which may affect the operation of the Steering Wheel Controls System. Refer to «Checking Aftermarket Accessories»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__checking-aftermarket-accessories) .
  2. Inspect for easily accessible or visible system components for obvious damage or conditions which may 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 Steering Wheel Controls Malfunction in order to diagnose the symptom.

  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/cts/ii-2007-2014/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/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
B+ Voltage ReferenceB1529 031B1529 07
Steering Wheel Control Switch Signal11B3622 07
1. Steering Wheel Controls Inoperative

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

Before diagnosis of the steering wheel controls, ensure the primary controls of the associated component are functioning properly.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

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.

  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. 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 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 If less than the specified value, test the signal circuits for a short to voltage or an open/high resistance. If the circuits test normal, replace the BCM.
  4. Ignition OFF, disconnect the X1 harness connector at the BCM.
  5. Test for infinite resistance between ground 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 If less than the specified value, test the signal circuits for a short to ground.
  6. Ignition ON, test for less than 1 volt between ground and the voltage reference circuit terminal 5 at the left steering wheel control switch. If greater than the specified range, test the voltage reference circuit for a short to voltage
  7. Ignition ON, test for infinite resistance between ground and the voltage reference circuit terminal 5 at the left steering wheel control switch. If not the specified value, test the voltage reference circuit for a short to ground.
  8. Test for less than 1 ohm between the voltage reference circuit terminal 5 at the left steering wheel control switch and the voltage reference circuit terminal 5 at the right steering wheel control switch. If greater than the specified range, test the voltage reference circuit for a an open/high resistance.
  9. If all circuits test normal, test or replace the left or right steering wheel control switch.
  1. Disconnect the harness connector at the right or left steering wheel control switch.
  2. Connect a DMM between terminal 5 and terminal 6 (left switch) or terminal 2 (right switch) of either the left or right steering wheel control switches. If any of the resistance measurements for the individual switches are not within the specified resistance values, replace the left or right steering wheel control switch.
Function SwitchMinimum Resistance ValueMaximum Resistance Value
Source787 Ohms987 Ohms
No Switch PressedO.L.O.L.

Left Steering Wheel Switch Resistance

Function SwitchMinimum Resistance ValueMaximum Resistance Value
Previous534 Ohms734 Ohms
Next898k Ohms1.25k Ohms
Volume Up1.3k Ohms1.5k Ohms
Volume Down1.6k Ohms1.8k Ohms
Mute/Voice Recognition2.6k Ohms3.0k Ohms
No Switch PressedO.L.O.L.

Right Steering Wheel Switch Resistance

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Steering Wheel Control Switch Assembly Replacement»(/cadillac/cts/ii-2007-2014/remont/memory-modules/#secondary-and-configurable-customer-control-system)
  2. «Control Module References»(/cadillac/cts/ii-2007-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, setup, and programming

Scheme 2

Scheme 2: Steering Wheel Control Switch Assembly Replacement
Scheme 2: Steering Wheel Control Switch Assembly Replacement
CalloutComponent Name
WARNING: Refer to SIR Warning . Preliminary Procedure: Remove the inflatable restraint steering wheel module. Refer to Steering Wheel Inflatable Restraint Module Replacement .
1Steering Wheel Trim Cover Bolt (Qty: 4) CAUTION: Refer to Fastener Caution . Tighten: 2 N.m (18 lb in)
2Steering Wheel Trim Cover (Qty: 2) Tip: Remove switch and bezel straight out from steering wheel assembly, removing at an angle can cause damage to the foam behind the bezel.
3Steering Wheel Control Switch Assembly (Qty: 2) Procedure Radio control switch assembly is shown. Cruise control switch assembly is similar. Disconnect the electrical connectors. Make sure the steering wheel control switches are properly seated to the steering wheel trim cover during installation.
WARNING
Refer to SIR Warning .
CAUTION
Refer to Fastener Caution .

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 diagnosis 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.