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:
DTC P1553
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
DTC P158A
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
Symptoms - Cruise Control
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:
Vehicle Information Menu
(VEHICLE) Items
Units : Choose between Metric or
US when Units is active. Press to
confirm the setting. This will change
the displays on the DIC to the type
of measurements you select.
Speed Warning : This display is
used to set the vehicle speed at
which the speed warning chime
sounds and the alert is displayed.
Climate Control Status Display
The climate control status display
appears briefly when the center
stack climate controls are adjusted.
The air delivery mode can be
adjusted on the climate control
display.
Climate Control Influence on Fuel
Economy
The climate control system depends
on other vehicle systems for heat
and power inp
