Diagnostic Instructions
DTC Descriptor
DTC B3623
Steering Wheel Controls Distance Sensing Cruise Control Gap Up/Down Signal Circuit
DTC B3794
Cruise Control Function Request Circuit
DTC P0564
Cruise Control Multifunction Switch Circuit
DTC P0565
Cruise Control Switch Circuit
DTC P0567
Cruise Control Resume Switch Circuit
DTC P0568
Cruise Control Set Switch Circuit
DTC P056C
Cruise Control Cancel Switch 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/Accelerate Switch 2 Circuit
DTC P162C
Vehicle Speed Limiting/Warning Switch Circuit
Symptom Byte Information: Symptom Byte List.
Diagnostic Fault Information
1.Cruise Control=Malfunction
Typical Scan Tool Data
Body Control Module-Scan Tool Parameters
Circuit/System Description
For an overview of the component/system, refer to:Cruise Control Description and Operation (Without Adaptive Cruise Control) or Cruise Control Description and Operation (With Adaptive Cruise Control).
Conditions for Running the DTC
Frequency the DTC runs=Continuously - After the running conditions are met - For greater than 5 s.
Conditions for Setting the DTC
B3623
Distance Sensing Cruise Control Follow Gap Set Circuit - Invalid Signal Received
B3794, P0564, P0565, P0567, P0568, P056C, P0580, P0581
Cruise Control Switch Circuit - Invalid Signal Received
P0589, P0592, P0593, P155B, P155C
Cruise Control Multifunction Switch 2 Circuit - Invalid Signal Received
P155A
Cruise Control Switch State Undetermined
P162C
Vehicle Speed Limiting/Warning Switch Circuit - Undetermined State
Actions Taken When the DTC Sets
Conditions for Clearing the DTC
DTCs listed in the DTC Descriptor Category=Type C DTC
Reference Information
Schematic Reference
Cruise Control Wiring Schematics
Connector End View Reference
Component Connector End View Index
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References
Circuit/System Verification
1. Ignition - On / Vehicle - In Service Mode.
2. Verify the component works as specified:Cruise Control Switch Assembly.
3. Refer to:Body Control Module-Scan Tool Parameters in Typical Scan Tool Data.
Refer to Circuit/System Testing.
4. Verify the condition does not exist:Cruise Control System Status=Inhibit by ECM
If a condition exists - Repair or replace as necessary
5. Verify that no DTC listed in the DTC Descriptor Category is set.
Refer to Circuit/System Testing.
6. All OK.
Circuit/System Testing
Cruise Control Switch Signal
1. Ignition/Vehicle & All vehicle systems - Off.
2. Disconnect the component:K9 Body Control Module.
3. Disconnect the component:Cruise Control Switch Assembly.
4. Ignition - On / Vehicle - In Service Mode.
5. Test for less than 1 V between the test points:
6. Ignition/Vehicle - Off.
7. Test for infinite resistance between the test points:
8. Test for less than 2 ohms between the test points:
9. Test or replace the component:Cruise Control Switch Assembly.
10. Operate the vehicle within the Conditions for Running the DTC. Verify the DTC does not set.
Replace the component:K9 Body Control Module
11. All OK.
Adaptive Cruise Control Gap Up/Down Switch Signal
1. Ignition/Vehicle & All vehicle systems - Off.
2. Disconnect the component:K9 Body Control Module.
3. Disconnect the component:Cruise Control Switch Assembly.
4. Ignition - On / Vehicle - In Service Mode.
5. Test for less than 1 V between the test points:
6. Ignition/Vehicle - Off.
7. Test for infinite resistance between the test points:
8. Test for less than 2 ohms between the test points:
9. Test or replace the component:Cruise Control Switch Assembly
10. Operate the vehicle within the Conditions for Running the DTC. Verify the DTC does not set.
Replace the component:K9 Body Control Module
11. All OK.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification.
For control module replacement, programming, and setup refer to: Control Module References.