• Perform the Diagnostic System Check prior to using this diagnostic procedure:Diagnostic System Check - Vehicle
• Review the description of Strategy Based Diagnosis:Strategy Based Diagnosis
• An overview of each diagnostic category can be found here:Diagnostic Procedure Instructions

• For an overview of the component/system, refer to:Cruise Control Description and Operation
• The K9 sends a serial data message to the K20 indicating the B22 function that has been requested.

• Ignition/Vehicle=On
• Vehicle Speed.=Greater than 40 km/h (25 MPH)
• Cruise Control=On

Frequency the DTC runs=Continuously—After the running conditions are met—For greater than 5 s

Brake Pedal Position Sensor Signal=Invalid Serial Data

• Cruise Control System Status=Disabled
• DTCs listed in the DTC Descriptor category=Type C DTC

DTCs listed in the DTC Descriptor category=Type C DTC

Cruise Control Schematics

Master Electrical Component List

• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Control Module References

1. Ignition » On / Vehicle » In Service Mode
2. Verify there are no other DTCs set, except for DTC P0703.
• If any other DTCs are set

  Refer to:Diagnostic Trouble Code (DTC) List - Vehicle

• If no other DTCs are set
3. Replace the component:K9 Body Control Module
4. Operate the vehicle within the Conditions for Running the DTC.»Verify the DTC does not set.
• If DTC P0703 is set

  Replace the component:K20 Engine Control Module

• If the DTC is not set
5. All OK.

Perform the Diagnostic Repair Verification after completing the repair:Diagnostic Repair Verification

For control module replacement, programming, and setup refer to:Control Module References