DTC Descriptor
DTC P0573 00 : Brake Switch Circuit 1 High VoltageDiagnostic Fault Information
Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
Circuit | Short to Ground | Open or High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Stop Lamp Switch Signal | P0572 00 | P0573 00 | P0573 00 | -- |
Circuit/System Description
The torque converter clutch (TCC) signal circuit is a direct hardwire input to the engine control module (ECM) and transmission control module (TCM) from the body control module (BCM). The ECM monitors the stop lamp switch circuit to detect when the brake pedal has been applied. The BCM monitors the stop lamp switch to determine when the brake pedal is applied. When the brake pedal is applied, The BCM sends a GMLAN serial data message to the ECM indicating that the brake pedal has been applied. The BCM also sends a voltage signal on the stop lamp switch circuit to the ECM.
Conditions for Running the DTC
| • | The ignition is ON. |
| • | The engine is running. |
| • | Battery voltage is greater than 11.5 volts. |
Conditions for Setting the DTC
The ECM detects an open, high resistance, or a short to voltage on the TCC brake signal circuit when the serial data message from the BCM indicates the brakes are applied.
Action Taken When the DTC Sets
| • | The ECM stores the DTC to memory. |
| • | The ECM will record the operating conditions at the time the diagnostic failed. The ECM stores this information in Failure Records. |
Conditions for Clearing the DTC
| • | The condition responsible for setting the DTC no longer exists. |
| • | The ECM receives a CLEAR DTCs command from the scan tool. |
| • | A history DTC will clear once 40 malfunction-free ignition cycles have occurred. |
Reference Information
Schematic Reference
Connector End View Reference
Lighting Systems Connector End Views
Electrical Information Reference
Scan Tool Reference
Circuit/System Testing
Test the TCC brake signal circuit for an open, a high resistance, or a short to voltage.
| ⇒ | If the circuit tests OK, replace the ECM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for ECM replacement, setup, and programming
