DTC P0703
Diagnostic Instructions
DTC Descriptor
DTC P0703: Brake Switch Circuit 2
Circuit/System Description
The engine control module (ECM) monitors the brake pedal position sensor. When the brake pedal is applied, the ECM detects a predetermined voltage signal. The ECM sends a serial data message to the body control module (BCM) indicating the status of the brake lamps.
Conditions for Running the DTC
The engine is ON.
Conditions for Setting the DTC
| • | The BCM receives an invalid brake pedal status serial data message from the ECM. |
| • | This diagnostic runs continuously. |
Actions Taken When the DTC Sets
| • | The malfunction indicator lamp (MIL) will not illuminate. |
| • | The cruise control system is disabled. |
Conditions for Clearing the DTC
| • | The condition responsible for setting the DTC no longer exists. |
| • | A history DTC will clear after 40 malfunction-free ignition cycles have occurred. |
Reference Information
Schematic Reference
Cruise Control Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Cruise Control Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Verify that DTC P0571 is not set.
| ⇒ | If the brake system or brake lights do not operate properly, refer to DTC P0571 . |
- Verify that DTC P0703 is not set.
| ⇒ | If DTC P0703 is set, replace the K20 ECM. Clear the DTC and road test the vehicle. If DTC P0703 resets, replace the K9 BCM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for BCM or ECM replacement, setup, and programming
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