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P0568




Cruise Control Malfunction - DTC B3794, P0564, P0565, P0567, P0568, P056C, P0580, P0581, P155A-P155C, or P162C

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.

* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC B3794 08
- Cruise Control Function Request Circuit Performance - Signal Invalid

DTC B3794 61
- Cruise Control Function Request Circuit Stuck

DTC P0564
- Cruise Control Multifunction Switch Circuit

DTC P0565
- Cruise Control On/Off Switch Circuit

DTC P0567
- Cruise Control Resume/Acceleration Switch 1 Circuit

DTC P0568
- Cruise Control Set/Coast Switch 1 Circuit

DTC P056C
- Cruise Control Cancel Switch Circuit

DTC P0580
- Cruise Control Multifunction Circuit Low Voltage

DTC P0581
- Cruise Control Multifunction Circuit High Voltage

DTC P155A
- Cruise Control Switch State Undetermined

DTC P155B
- Cruise Control Set/Coast Switch 2 Circuit

DTC P155C
- Cruise Control Resume/Acceleration Switch 2 Circuit

DTC P162C
- Vehicle Speed Limiting/Warning Switch Circuit

Diagnostic Fault Information






Circuit/System Description

The cruise control switch is an input to the body control module (BCM). The BCM monitors the cruise control 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.

Conditions for Running the DTC

* The cruise switch is ON.

* 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

* 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.

* The ECM runs this diagnostic continuously.

P0580, P0581

* The ECM detects an invalid voltage signal on the cruise control switch signal circuit.

* The above condition is present for greater than 2 seconds.

* The ECM runs this diagnostic continuously.

P155A

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

P162C

The ECM is unable to determine the state of the vehicle speed limiting switch.

Actions Taken When the DTC Sets

B3794

* The malfunction indicator lamp (MIL) will not illuminate.

* The cruise control system is disabled.

P0564, P0565, P0567, P0568, P056C, P0580, P0581, P155A, P162C

DTCs P0564, P0565, P0567, P0568, P056C, P0580, P0581, P155A and P162C are type C DTCs

Conditions for Clearing the DTC

B3794

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

* A history DTC will clear after 40 malfunction-free ignition cycles have occurred.

P0564, P0565, P0567, P0568, P056C, P0580, P0581, P155A, P162C

DTCs P0564, P0565, P0567, P0568, P056C, P0580, P0581, P155A and P162C are type C DTCs.

Reference Information

Schematic Reference

Cruise Control Schematics Electrical Diagrams

Connector End View Reference

Component Connector End Views Fuel Pump and Level Sensor Assembly

Description and Operation

Cruise Control Description and Operation Description and Operation

Electrical Information Reference

* Circuit Testing Circuit Testing

* Connector Repairs Connector Repairs

* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections

* Wiring Repairs Wiring Repairs

Scan Tool Reference

Control Module References Control Module References for scan tool information

Circuit/System Verification

1. Ignition ON.

2. Verify the scan tool ECM Cruise Control Switch Status parameter changes between Off and On, Resume and Set when switching between each position on the cruise control switch.

• If the parameter does not change
Refer to Circuit/System Testing.

• If the parameter changes

3. All OK.

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 1 and ground.

• If the test lamp does not illuminate

1. Ignition OFF, disconnect the harness connector at the K9 body control module.

2. Test for greater than 100 ohms between the ignition circuit and ground.

• If 100 ohms or less, repair the short to ground on the circuit.

• If greater than 100 ohms

3. 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. Verify the scan tool ECM Cruise Control Switch Status parameter is Off.

• If not Off

1. Ignition OFF, disconnect the harness connector at the K9 body control module, ignition ON.

2. Test for less than 1 V between the signal circuit terminal 3 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 Off

4. Install a 3 A fused jumper wire between the signal circuit terminal 3 and the ignition circuit terminal 1.

5. Verify the scan tool ECM Cruise Control parameter is Disabled.

• If not Error

1. Ignition OFF, disconnect the harness connector at the K9 body control module.

2. Test for infinite resistance between the signal circuit terminal 9 and ground.

• If less than infinite resistance, repair the short to ground on the circuit.

• If infinite resistance

3. 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 Error

6. Test or replace the S70L steering wheel controls switch-left.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the repair.

Control Module References Control Module References for BCM replacement, programming and setup

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