Cruise Control System Cadillac ATS I

Scheme 1

Diagnostic Code Index

DIAGNOSTIC CODE INDEX

Diagnostic Instructions

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/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/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Diagnostic Fault Information

Circuit/System Description

Cruise Control Switch Primary Circuit 1

The cruise control switch 1 signal is an input to the body control module (BCM). The BCM monitors the cruise control on/off, speed limiter on/off, set/coast, resume/accelerate and cancel switches via the cruise control switch signal circuit in order to detect when the driver has requested to perform a cruise control function. The BCM detects a specific voltage signal on the cruise control switch signal circuit when a switch is applied. The engine control module (ECM) receives the requested cruise control switch function from the BCM via a serial data message.

Cruise Control Switch Secondary Circuit 2

The cruise control secondary switch 2 signal is an input to the body control module (BCM). The BCM monitors the speed increase high and speed decrease high switches via the cruise control secondary switch signal circuit in order to detect when the driver has requested to perform a cruise control function. The BCM detects a specific voltage signal on the cruise control secondary switch signal circuit when a switch is applied. The engine control module (ECM) receives the requested cruise control secondary switch function from the BCM via a serial data message.

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

B3794 08

The BCM detects an invalid voltage signal on the cruise control switch signal circuit for 1 second.

B3794 61

Stuck switch for either Resume/Accel or Set/Coast button for 60 seconds.

P0564, P0565, P0567, P0568, P056C

1. The BCM detects an invalid voltage signal on the cruise control switch signal circuit for greater than 2 seconds and sends a serial data message to the ECM. The ECM sets these DTCs when the message is received.
2. The ECM runs this diagnostic continuously.

P0580, P0581

1. The ECM detects an invalid voltage signal on the cruise control switch signal circuit.
2. The ECM runs this diagnostic continuously.

P0589, P0592, P0593

1. The ECM detects and invalid voltage signal on the cruise control switch 2 signal circuit.
2. The ECM runs this diagnostic continuously.

P155A

The ECM is unable to determine the state of the cruise control switch.

P155B, P155C

1. The ECM sets these DTCs when the associated cruise switch is active for greater than an allowed duration.
2. The ECM runs this diagnostic continuously.

Actions Taken When the DTC Sets

B3794

1. The malfunction indicator lamp (MIL) will not illuminate.
2. The cruise control system is disabled.

P0564, P0565, P0567, P0568, P056C, P0580, P0581, P0589, P0592, P0593, P155A, P155B, P155C

DTCs P0564, P0565, P0567, P0568, P056C, P0580, P0581, P0589, P0592, P0593, P155A, P155B, P155C are type C DTCs.

Conditions for Clearing the DTC

B3794

1. The condition responsible for setting the DTC no longer exists.
2. A history DTC will clear after 40 malfunction-free ignition cycles have occurred.

P0564, P0565, P0567, P0568, P056C, P0580, P0581, P0589, P0592, P0593, P155A, P155B, P155C

DTCs P0564, P0565, P0567, P0568, P056C, P0580, P0581, P0589, P0592, P0593, P155A, P155B, P155C are type C DTCs.

Reference Information

Schematic Reference

Cruise Control Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Cruise Control Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/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

Note. An open ignition circuit or fuse before the control module will cause communication DTCs or power mode mismatch DTCs to set against or in the control module. This failure mode will be diagnosed in the no communications diagnostic procedure or power mode mismatch. This test assumes the ignition circuit has a driver that will open under a high current condition before the fuse opens. The driver can open under normal conditions such as battery run down protection or a retained accessory power mode.

1. Ignition OFF, disconnect the harness connector at the S70L Steering Wheel Controls Switch - Left, ignition ON.
2. Verify a test lamp illuminates between the ignition circuit terminal 8 and ground. If the test lamp does not illuminate Ignition OFF, disconnect the harness connector at the K9 Body Control Module. Test for infinite resistance between the ignition circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the ignition circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, test or replace the K9 Body Control Module. If the test lamp illuminates
3. Test for less than 1 V between the signal circuit terminals listed below: Signal circuit terminal 9 Signal circuit terminal 10 If 1 V or greater Ignition OFF, disconnect the X3 harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K9 Body Control Module. If less than 1 V
4. Ignition OFF.
5. Test for greater than 100 ohms between the signal circuit terminals listed below and ground: Signal circuit terminal 9 Signal circuit terminal 10 If 100 ohms or less Ignition OFF, disconnect the X3 harness connector at the K9 Body Control Module. Test for infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K9 Body Control Module. If greater than 100 ohms
6. Ignition ON.
7. Test for B+ between the ignition circuit terminal 8 and the control circuit terminals listed below: Signal circuit terminal 9 Signal circuit terminal 10 If less than B+ Ignition OFF, disconnect the X3 harness connector at the K9 Body Control Module. Test for less than 10 ohms in the signal circuit end to end. If 10 ohms or greater, repair the open/high resistance in the signal circuit. If less than 10 ohms, replace the K9 Body Control Module. If B+
8. Test or replace the S70L Steering Wheel Controls Switch - Left.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

1. «Cruise Control Switch Replacement»(/cadillac/ats/i-2012-2014/remont/cruise-control-systems/#cruise-control-system)
2. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for body control module replacement, programming, and setup.

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/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/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The stop lamp switch signal circuit is a B+ input from the body control module (BCM) to the engine control module (ECM). The ECM monitors the stop lamp switch circuit to detect when the brake pedal has been applied. The BCM monitors the brake pedal position sensor to determine when the brake pedal is applied. When the brake pedal is applied, the BCM supplies B+ on the stop lamp switch signal circuit and also sends a serial data message to the ECM indicating that the brake pedal has been applied.

1. The engine is running.
2. Battery voltage is greater than 11.5 V.
3. Brakes applied.

P0572

This DTC will set when the ECM detects a short to ground or an open on the discrete brake signal circuit when the serial data message from the BCM indicates the brakes are applied. This diagnostic will run when the serial data message and the voltage signal on the brake switch signal circuit do not match for 8 out 10 times, and the condition is present for greater than 2 s.

P0573

This DTC will set when the ECM detects a short to voltage on the discrete brake signal circuit when the serial data message from the BCM indicates the brakes are not applied. This diagnostic will run when the serial data message and the voltage signal on the brake switch signal circuit do not match for 8 out 10 times, and the condition is present for greater than 2 s.

1. The malfunction indicator lamp (MIL) will not illuminate.
2. The cruise control system is disabled.

1. The condition responsible for setting the DTC no longer exists.
2. A history DTC will clear after 40 malfunction-free ignition cycles have occurred.

Schematic Reference

Cruise Control Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Cruise Control Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/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 Verification

1. Ignition ON.
2. Verify that the stop lamps operate properly and that no B22 Brake Pedal Position Sensor related DTCs are set. If brake pedal position sensor related DTCs are set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) If no brake pedal position sensor related DTCs are set
3. Refer to Circuit/System Testing.

1. Ignition OFF, disconnect the X1 harness connector at the K20 Engine Control Module, ignition ON.
2. Connect a test lamp between the signal circuit terminal 57 and ground.
3. Verify the test lamp turns ON and OFF when pressing and releasing the brake pedal. If the test lamp is always OFF Ignition OFF, disconnect the harness connector at the K9 Body Control Module. Test for infinite resistance between the signal circuit and ground. If not infinite resistance, repair the short to ground on the circuit. If infinite resistance. Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If the test lamp is always ON Ignition OFF, disconnect the harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V replace the K9 Body Control Module. If the test lamp turns ON and OFF
4. Replace the K20 Engine Control Module.

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for BCM or ECM replacement, programming, and setup.

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/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/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

When a cruise control function switch is activated, the body control module (BCM) detects a predetermined voltage. The BCM sends a serial data message to the engine control module (ECM) indicating the function that has been requested.

1. The ignition is ON.
2. The vehicle speed is greater than 40 km/h (25 MPH) and the cruise control is engaged.

1. The ECM receives an invalid cruise control switch status serial data message from the BCM.
2. This diagnostic runs continuously.

DTC P0575 is a type C DTC.

DTC P0575 is a type C DTC.

Schematic Reference

Cruise Control Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Cruise Control Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON.
2. Verify that no DTCs are set, except DTC P0575. If any other DTC is set, except DTC P0575 Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) . If only DTC P0575 is set
3. Replace the K9 Body Control Module.
4. Verify DTC P0575 does not set when operating the vehicle within the Conditions for Running the DTC. If the DTC sets Replace the K20 Engine Control Module. If the DTC does not set
5. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for BCM or ECM replacement, programming, and setup.

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/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/ats/i-2012-2014/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 brake pedal position sensor. When the brake pedal is applied, the BCM detects a predetermined voltage signal. The BCM sends a serial data message to the engine control module (ECM) indicating the status of the stop lamps.

The engine is ON.

1. The ECM receives an invalid brake pedal status serial data message from the BCM.
2. This diagnostic runs continuously.

1. The malfunction indicator lamp (MIL) will not illuminate.
2. The cruise control system is disabled.

1. The condition responsible for setting the DTC no longer exists.
2. A history DTC will clear after 40 malfunction-free ignition cycles have occurred.

Schematic Reference

Cruise Control Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Cruise Control Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/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 ON.
2. Verify that no DTCs are set, except DTC P0703. If any other DTC is set, except DTC P0703 Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) . If only DTC P0703 is set
3. Replace the K9 Body Control Module.
4. Verify DTC P0703 does not set when operating the vehicle within the conditions for running the DTC. If the DTC sets Replace the K20 Engine Control Module. If the DTC does not set
5. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for BCM or ECM replacement, programming, and setup.

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/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/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The engine control module (ECM) detects a serial communication failure associated with the adaptive cruise control axle torque request.

The ignition is ON.

1. The ECM detects a serial communication failure associated with the adaptive cruise control axle torque request.
2. This diagnostic runs continuously.

1. The malfunction indicator lamp (MIL) will not illuminate.
2. The cruise control system is disabled.

1. The condition responsible for setting the DTC no longer exists.
2. A history DTC will clear after 40 malfunction-free ignition cycles have occurred.

Diagnostic Aid

Both DTCs P1553 and P15F6 can be set by the ECM against the distance sensing cruise control module if the battery voltage drops below 9 volts during a cranking condition. This is a result of the internal microprocessor in the distance sensing cruise control module resetting when subjected to a low voltage condition during cranking. Under this condition, the rolling count signal transmitted to the ECM for the distance sensing cruise control module freezes while the microprocessor is resetting. As a result of the rolling count signal freezing, the ECM may set DTCs P1553 and P15F6 and transition to history within 5 seconds. No driver information center (DIC) service messages or tell-tales will be displayed.

Schematic Reference

1. «Cruise Control Schematics»(/cadillac/ats/i-2012-2014/remont/cruise-control-systems/#cruise-control-system)
2. «Object Detection Schematics»(/cadillac/ats/i-2012-2014/remont/collisionavoidance/#object-detection-system-park-assist-system)

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Cruise Control Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Note. Do not replace the K14 Distance Sensing Cruise Control Module or K20 Engine Control Module if DTC P1553 or P15F6 are stored as history DTCs. This is a known issue that has no impact to system function and does not require any additional repair, programming or module replacement.

1. Ignition ON.
2. Verify that no DTCs are set, except DTC P1553. If any other DTC is set, except DTC P1553 Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) . If only DTC P1553 is set
3. Replace the K14 Distance Sensing Cruise Control Module.
4. Verify DTC P1553 does not set when operating the vehicle within the conditions for running the DTC. If the DTC sets Replace the K20 Engine Control Module. If the DTC does not set
5. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for distance sensing cruise control module or ECM replacement, programming, and setup

Symptoms - Cruise Control

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

1. Before using the symptom diagnostic table, perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) in order to verify the following conditions: There are no DTCs set. The module can communicate via the serial data.
2. Review the system operation in order to understand the system functions. Refer to «Cruise Control Description and Operation»(/cadillac/ats/i-2012-2014/remont/cruise-control-systems/#cruise-control-system__cruise-control-description-and-operation) .

Visual/Physical Inspection

1. Inspect for aftermarket devices which can affect the operation of the Cruise Control System. Refer to «Checking Aftermarket Accessories»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__checking-aftermarket-accessories) .
2. Inspect the accessible system components or the visible system components for obvious damage or for obvious conditions which can 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

1. «Cruise Control Indicator Malfunction»(/cadillac/ats/i-2012-2014/remont/cruise-control-systems/#cruise-control-system)
2. «Cruise Control Malfunction»(/cadillac/ats/i-2012-2014/remont/cruise-control-systems/#cruise-control-system)

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/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/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The instrument cluster illuminates the cruise control engaged indicator based on serial data messages received from the engine control module (ECM). The indicator is commanded ON when the cruise control system is controlling vehicle speed, and turned OFF with the system disengaged.

Schematic Reference

Cruise Control Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Cruise Control Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/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 ON.
2. Verify the cruise control indicator turns ON and OFF when commanding the All Indicators ON and OFF with a scan tool. If the indicator does not turn ON and OFF Replace the P16 Instrument Cluster. If the indicator turns ON and OFF
3. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for instrument cluster replacement, programming and setup.

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/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/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Cruise Control Switch Primary Circuit 1

The cruise control switch 1 signal is an input to the body control module (BCM). The BCM monitors the cruise control on/off, speed limiter on/off, set/coast, resume/accelerate and cancel switches via the cruise control switch signal circuit in order to detect when the driver has requested to perform a cruise control function. The BCM detects a specific voltage signal on the cruise control switch signal circuit when a switch is applied. The engine control module (ECM) receives the requested cruise control switch function from the BCM via a serial data message.

Cruise Control Switch Secondary Circuit 2

The cruise control secondary switch 2 signal is an input to the body control module (BCM). The BCM monitors the speed increase high and speed decrease high switches via the cruise control secondary switch signal circuit in order to detect when the driver has requested to perform a cruise control function. The BCM detects a specific voltage signal on the cruise control secondary switch signal circuit when a switch is applied. The engine control module (ECM) receives the requested cruise control secondary switch function from the BCM via a serial data message.

The ignition is ON.

B3794 08

The BCM detects an invalid voltage signal on the cruise control switch signal circuit for 1 second.

B3794 61

Stuck switch for either Resume/Accel or Set/Coast button for 60 seconds.

P0564, P0565, P0567, P0568, P056C

1. The BCM detects an invalid voltage signal on the cruise control switch signal circuit for greater than 2 seconds and sends a serial data message to the ECM. The ECM sets these DTCs when the message is received.
2. The ECM runs this diagnostic continuously.

P0580, P0581

1. The ECM detects an invalid voltage signal on the cruise control switch signal circuit.
2. The ECM runs this diagnostic continuously.

P0589, P0592, P0593

1. The ECM detects and invalid voltage signal on the cruise control switch 2 signal circuit.
2. The ECM runs this diagnostic continuously.

P155A

The ECM is unable to determine the state of the cruise control switch.

P155B, P155C

1. The ECM sets these DTCs when the associated cruise switch is active for greater than an allowed duration.
2. The ECM runs this diagnostic continuously.

B3794

1. The malfunction indicator lamp (MIL) will not illuminate.
2. The cruise control system is disabled.

P0564, P0565, P0567, P0568, P056C, P0580, P0581, P0589, P0592, P0593, P155A, P155B, P155C

DTCs P0564, P0565, P0567, P0568, P056C, P0580, P0581, P0589, P0592, P0593, P155A, P155B, P155C are type C DTCs.

B3794

1. The condition responsible for setting the DTC no longer exists.
2. A history DTC will clear after 40 malfunction-free ignition cycles have occurred.

P0564, P0565, P0567, P0568, P056C, P0580, P0581, P0589, P0592, P0593, P155A, P155B, P155C

DTCs P0564, P0565, P0567, P0568, P056C, P0580, P0581, P0589, P0592, P0593, P155A, P155B, P155C are type C DTCs.

Schematic Reference

Cruise Control Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Cruise Control Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Note. An open ignition circuit or fuse before the control module will cause communication DTCs or power mode mismatch DTCs to set against or in the control module. This failure mode will be diagnosed in the no communications diagnostic procedure or power mode mismatch. This test assumes the ignition circuit has a driver that will open under a high current condition before the fuse opens. The driver can open under normal conditions such as battery run down protection or a retained accessory power mode.

1. Ignition OFF, disconnect the harness connector at the S70L Steering Wheel Controls Switch - Left, ignition ON.
2. Verify a test lamp illuminates between the ignition circuit terminal 8 and ground. If the test lamp does not illuminate Ignition OFF, disconnect the harness connector at the K9 Body Control Module. Test for infinite resistance between the ignition circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the ignition circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, test or replace the K9 Body Control Module. If the test lamp illuminates
3. Test for less than 1 V between the signal circuit terminals listed below: Signal circuit terminal 9 Signal circuit terminal 10 If 1 V or greater Ignition OFF, disconnect the X3 harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K9 Body Control Module. If less than 1 V
4. Ignition OFF.
5. Test for greater than 100 ohms between the signal circuit terminals listed below and ground: Signal circuit terminal 9 Signal circuit terminal 10 If 100 ohms or less Ignition OFF, disconnect the X3 harness connector at the K9 Body Control Module. Test for infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K9 Body Control Module. If greater than 100 ohms
6. Ignition ON.
7. Test for B+ between the ignition circuit terminal 8 and the control circuit terminals listed below: Signal circuit terminal 9 Signal circuit terminal 10 If less than B+ Ignition OFF, disconnect the X3 harness connector at the K9 Body Control Module. Test for less than 10 ohms in the signal circuit end to end. If 10 ohms or greater, repair the open/high resistance in the signal circuit. If less than 10 ohms, replace the K9 Body Control Module. If B+
8. Test or replace the S70L Steering Wheel Controls Switch - Left.

Perform the Diagnostic Repair Verification after completing the repair.

1. «Cruise Control Switch Replacement»(/cadillac/ats/i-2012-2014/remont/cruise-control-systems/#cruise-control-system)
2. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for body control module replacement, programming, and setup.

Scheme 2

Cruise Control Switch Replacement

Cruise Control Description and Operation

Cruise control is a speed control system that maintains a desired vehicle speed under normal driving conditions at speeds above 40.2 km/h (25 mph). Steep grades may cause variations in the selected vehicle speeds.

The following are the main components of the Cruise Control System

1. The accelerator pedal
2. The brake pedal position (BPP) sensor
3. The body control module (BCM)
4. The cruise on/off switch
5. The cruise control cancel switch
6. The + RES switch (equivalent to resume/accel switch)
7. The Increase High Switch
8. The - SET switch (equivalent to set/coast switch)
9. The Decrease High Switch
10. The engine control module (ECM)
11. The throttle actuator control (TAC) motor
12. The vehicle speed sensor

The body control module (BCM) monitors the signal circuit of the cruise control switches, which are located on the steering wheel. The BCM relays the cruise control switch status to the engine control module (ECM) via the serial data circuit. The ECM uses the status of the cruise control switch to determine when to capture and maintain the vehicle speed. The ECM monitors the vehicle speed signal circuit in order to determine the desired vehicle speed.

Voltage is supplied to the cruise control switch via the steering wheel control switch reference voltage circuit supplied by the BCM. The cruise control function switches are arranged in a resistive ladder design, with each cruise control function switch having a different resistance value. The BCM detects a specific voltage value that is associated with the cruise control function switch being activated. The BCM sends a serial data message to the ECM indicating that the on/off switch is active. Similarly, when the normally open + RES switch or the normally open - SET switch are pressed, the switch closes and the BCM detects the predetermined voltage signal on the cruise control resume/accel and set/coast switch signal circuit. The BCM sends a serial data message to the ECM indicating that the + RES switch or the - SET switch is active. The + RES switch or the - SET switch will remain inactive when the BCM has not received the predetermined voltage signal from the on/off switch. Applications that include the Decrease High and Increase High switches have a second resistive ladder that is connected to a separate BCM input. However, each switch being applied will have a unique resistance and voltage, similar to the primary cruise switches.

Cruise Control Engaged

The Cruise Control System will engage and adjust vehicle speeds, based on the activation of the following cruise control switches, which are located on the steering wheel

1. On/Off
2. + RES
3. SET
4. Increase High
5. Decrease High

To engage the Cruise Control System, ensure that the vehicle speed is above 40.2 km/h (25 mph), turn the cruise On/Off switch ON and momentarily press the - SET switch. The ECM will engage the Cruise Control System and record the vehicle speed. The ECM sends a serial data message to the instrument panel cluster (IPC) in order to illuminate the Cruise Engaged indicator in the IPC. Refer to the vehicle owner's manual for the location and operation of the cruise control On/Off indicators and driver information center (DIC) messages.

After cruise is engaged, cruise control set speed can be modified by using any of the four switches listed above (- SET, Decrease High, - RES, and Increase High). The - Set switch is the first position in the downward direction when applying the switch. The Decrease High switch is the second position in the downward direction when applying the switch. The - RES switch is the first position in the upward direction when applying the switch. The Increase High switch is the second position in the upward direction when applying the switch.

Pressing the accelerator pedal while the Cruise Control System is engaged, allows the driver to override the Cruise Control System in order to accelerate the vehicle beyond the current set vehicle speed. When the accelerator pedal is released, the vehicle will decelerate and resume the current set vehicle speed.

When cruise control is engaged and maintaining a set speed, if the vehicle speed exceeds the set speed due to downhill conditions, the brakes may be applied to maintain the set speed. Disengagement of cruise control will cause any braking activity to be terminated.

The driver can also override the current set vehicle speed via the - SET switch and the + RES switch. When the Cruise Control System is engaged, pressing and holding the - SET switch will allow the vehicle to decelerate from the current set vehicle speed without deactivating the Cruise Control System. The ECM may command automatic braking to achieve the desired deceleration. When the - SET switch is released, the ECM will record the vehicle speed and maintain the vehicle speed as the new set vehicle speed. When the Cruise Control System is engaged, pressing and holding the Decrease High switch will allow the vehicle to decelerate at a greater deceleration rate than provided by the - SET switch from the current set vehicle speed without deactivating the Cruise Control System. When the Decrease High switch is released, the ECM will record the vehicle speed and maintain the vehicle speed as the new set vehicle speed. Again, the ECM may command automatic braking to achieve the desired deceleration. When the Cruise Control System is engaged, momentarily pressing the - SET switch will allow the vehicle to decelerate at 1.6 km/h (1 mph) increments for each time that the - SET is momentarily pressed, with a minimum vehicle speed of 38 km/h (24 mph). When the Cruise Control System is engaged, momentarily pressing the Decrease High switch will allow the vehicle to decelerate at 5 km/h (5 mph) increments for each time that the Decrease High is momentarily pressed, with a minimum vehicle speed of 38 km/hr (24 mph). The brakes may be applied to achieve the desired deceleration to achieve the new set speed.

Pressing and holding the + RES switch, when the Cruise Control System is engaged, will allow the vehicle to accelerate to a greater vehicle speed than the current set vehicle speed. When the + RES switch is released, the ECM will record the vehicle speed and maintain the vehicle speed as the new set vehicle speed. When the Cruise Control System is engaged, pressing and holding the Increase High switch will allow the vehicle to accelerate at a greater acceleration rate than provided by the - RES switch from the current set vehicle speed without deactivating the Cruise Control System. When the Increase High switch is released, the ECM will record the vehicle speed and maintain the vehicle speed as the new set vehicle speed. When the Cruise Control System is engaged, momentarily pressing the + RES switch will allow the vehicle to accelerate at 1.6 km/h (1 mph) increments for each time that the + RES switch is momentarily pressed. When the Cruise Control System is engaged, momentarily pressing the Increase High switch will allow the vehicle to accelerate at 5 km/hr (5 mph) increments for each time that the Increase High switch is momentarily pressed. Momentarily activating the + RES switch will recall the previous vehicle speed, after the cruise control system has been disengaged by pressing the brake pedal, or CANCEL switch.

Cruise Control Disengaged

The engine control module (ECM) disengages the cruise control operation based on the signals from the following switches

1. The brake pedal position (BPP) sensor
2. The On/Off switch
3. The cruise control cancel switch

The Cruise Control System will disengage when the brake pedal is applied. The body control module (BCM) monitors the BPP sensor via the BPP sensor signal circuit as the voltage signal increases while the pedal reaches the fully applied position. The ECM monitors the BPP signal through a discrete input and a serial data message signal from the BCM indicating the brake status. When either signal indicates the brake pedal is applied, the ECM will disengage the cruise control system.

The Cruise Control System will also disengage when the cruise control on/off switch is switched OFF, or the cruise control cancel switch is activated. The body control module (BCM) determines when the cruise control cancel switch is activated. When the normally open cancel switch is closed, the BCM detects the predetermined voltage signal on the cruise control function switch circuit. The vehicle speed stored in the memory of the engine control module will be erased when the cruise control On/Off switch is turned OFF, or the ignition switch is turned OFF. The BCM sends a serial data message to the ECM in order to disengage the cruise control system. When the Cruise Control System has been disengaged, the ECM sends a serial message to the instrument panel cluster (IPC) in order to turn OFF the Cruise Engaged indicator.

Every time the Cruise Control System is disengaged, the ECM will keep track of the reason for system disengagement. The last 8 disengagement reasons will be recorded within the ECM memory. The scan tool will display the last 8 Cruise Disengage History parameters, in which one out of approximately 50 possible reasons will be displayed in each of these 8 parameters. For the disengagement reason to be displayed within the scan tool parameter the Cruise Control System is active and disengagement is requested.

When engagement of the system is requested but an engagement inhibit is present, the most recent inhibit reason is recorded in the ECM memory. The scan toll will display the most recent inhibit reason, in which one out of approximately 50 possible reasons will be displayed.

Cruise Control Inhibited

The engine control module (ECM) inhibits the cruise control operation when any of the following conditions exist

1. The ECM has not detected a brake pedal activation from the body control module (BCM) this ignition cycle.
2. A Cruise Control System DTC has been set.
3. The vehicle speed is less than 38.6 km/h (24 mph).
4. The vehicle speed is too high.
5. The vehicle is in PARK, REVERSE, NEUTRAL, or 1st gear.
6. The engine RPM is low.
7. The engine RPM is high.
8. The system voltage is not between 9 volts and 16 volts.
9. The Antilock Brake System (ABS)/Traction Control System (TCS) is active for more than 0.5 seconds.

Cruise Control Inhibit Reasons

This is a general list of inhibit reasons. Not every inhibit reason is applicable to all vehicles. Refer to the scan tool inhibit reason list for the last 8 reasons that have been recorded during the current key cycle.

See also:
• Diagnostic System Check - Vehicle
• Strategy Based Diagnosis
• Diagnostic Procedure Instructions
• COMPONENT CONNECTOR END VIEWS - INDEX
• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs
• Control Module References
• Diagnostic Repair Verification
• Diagnostic Trouble Code (DTC) List - Vehicle
• Object Detection Schematics
• Checking Aftermarket Accessories
• Steering Wheel Airbag Replacement
• Steering Wheel Spoke Cover Replacement
• DTC B3623, B3794, P0564, P0565, P0567, P0568, P056C, P0580, P0581, P0589, P0592, P0593, or P155A-P155C
• Cruise Control Description and Operation