Cruise Control Malfunction
Cruise Control Malfunction
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 B3623 08
- Steering Wheel Controls Distance Sensing Cruise Control Gap Up/Down Signal Circuit - Signal Invalid
DTC B3623 61
- Steering Wheel Controls Distance Sensing Cruise Control Gap Up/Down Signal Circuit - Stuck
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 1 Circuit
DTC P0565
- Cruise Control On/Off Switch 1 Circuit
DTC P0567
- Cruise Control Resume/Acceleration Switch 1 Circuit
DTC P0568
- Cruise Control Set/Coast Switch 1 Circuit
DTC P0580
- Cruise Control Multifunction Switch Circuit Low Voltage
DTC P0581
- Cruise Control Multifunction Switch Circuit High Voltage
DTC P0589
- Cruise Control Multifunction Switch 2 Circuit
DTC P0592
- Cruise Control Multifunction Switch 2 Circuit Low Voltage
DTC P0593
- Cruise Control Multifunction Switch 2 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
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
* 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 ECM runs this diagnostic continuously.
P0589, P0592, P0593
* The ECM detects and invalid voltage signal on the cruise control switch 2 signal circuit.
* The ECM runs this diagnostic continuously.
P155A
The ECM is unable to determine the state of the cruise control switch.
P155B, P155C
* The ECM sets these DTCs when the associated cruise switch is active for greater than an allowed duration.
* The ECM runs this diagnostic continuously.
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, P0580, P0581, P0589, P0592, P0593, P155A, P155B, P155C
DTCs P0564, P0565, P0567, P0568, P0580, P0581, P0589, P0592, P0593, P155A, P155B, P155C 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, P0580, P0581, P0589, P0592, P0593, P155A, P155B, P155C
DTCs P0564, P0565, P0567, P0568, P0580, P0581, P0589, P0592, P0593, P155A, P155B, P155C 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 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
1. Ignition OFF, disconnect the harness connector at the K9 Body Control Module.
2. 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
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. 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
1. Ignition OFF, disconnect the X3 harness connector at the K9 Body Control Module, ignition ON.
2. 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:
* Signal circuit terminal 9
* Signal circuit terminal 10
• If 100 ohms or less
1. Ignition OFF, disconnect the X3 harness connector at the K9 Body Control Module.
2. 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+
1. Ignition OFF, disconnect the X3 harness connector at the K9 Body Control Module.
2. 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 Verification Tests after completing the repair.
* Cruise Control Switch Replacement Service and Repair
* Control Module References Control Module References for Body Control Module replacement, programming, and setup