Buick Regal: DTC P0703
Diagnostic Instructions
- 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
DTC Descriptor
DTC P0703
Brake Switch Signal Message Counter Incorrect
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)
- The K9 sends a serial data message to the K20 indicating the B22
function that has been
requested.
Conditions for Running the DTC
- 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
Conditions for Setting the DTC
Brake Pedal Position Sensor Signal=Invalid Serial Data
Actions Taken When the DTC Sets
- Cruise Control System Status=Disabled
- DTCs listed in the DTC Descriptor Category=Type C DTC
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
- Circuit Testing
- Connector Repairs
- Testing for Intermittent Conditions and Poor Connections
- Wiring Repairs
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 there are no other DTCs set, except for DTC P0703.
- If any other DTCs are set
- Refer to:Diagnostic Trouble Code (DTC) List - Vehicle
- Go to next step: 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
- Go to next step: If the DTC is not set
5. 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.
READ NEXT:
Diagnostic Instructions
Perform the Diagnostic System Check prior to using this diagnostic
procedure:Diagnostic System
Check - Vehicle
Review the description of Strategy Based Diagnosis:Strategy
Diagnostic Instructions
Perform the Diagnostic System Check prior to using this diagnostic
procedure:Diagnostic System
Check - Vehicle
Review the description of Strategy Based Diagnosis:Strategy
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 in
order to verify the follow
SEE MORE:
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diagnostic Procedure Instructions provide an overview of each diagnostic
category.
DTC Descriptors
DT
Warning:
On curves, ACC may not detect a
vehicle ahead in your lane. You
could be startled if the vehicle
accelerates up to the set speed,
especially when following a
vehicle exiting or entering exit ramps. You could lose control of
the vehicle or crash. Do not use
ACC while driving on an entrance
o