2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 2509
瀚慖f not the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the
ECM.
5. If all circuits test normal, test or replace the stop lamp switch.
Component Testing
1. Ignition OFF, disconnect the harness connector at the stop lamp switch.
2. With the brake pedal released, test for infinite resistance between terminal A and terminal B at the stop lamp switch.
瀚慖f not the specified value, replace the stop lamp switch.
3. With the brake pedal released, test for less than 1.0 ohm between terminal C and terminal D at the stop lamp switch.
瀚慖f not the specified value, replace the stop lamp switch.
4. With the brake pedal applied, test for less than 1.0 ohm between terminal A and terminal B at the stop lamp switch.
瀚慖f not the specified value, replace the stop lamp switch.
5. With the brake pedal applied, test for infinite resistance between terminal C and terminal D at the stop lamp switch.
瀚慖f not the specified value, replace the stop lamp switch.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Stop Lamp Switch Replacement (With Adjustable Pedals) (See: Lighting and Horns/Brake Light Switch/Service and Repair/Stop Lamp
Switch Replacement (With Adjustable Pedals))Stop Lamp Switch Replacement (Without Adjustable Pedals) (See: Lighting and
Horns/Brake Light Switch/Service and Repair/Stop Lamp Switch Replacement (Without Adjustable Pedals))
* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, setup, and programming
P0573
DTC P0572 or P0573
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC P0572
- Brake Switch Circuit 1 Low Voltage
DTC P0573
- Brake Switch Circuit 1 High Voltage
Diagnostic Fault Information
Circuit/System Description
The TCC Brake signal circuit is a high voltage input to the body control module (BCM), engine control module (ECM), transmission control
module (TCM), Power Take Off (PTO) module (if equipped) and Trailer Brake controller (if equipped). The BCM monitors the stop lamp switch
circuit to detect when the brake pedal has been applied. The ECM monitors the TCC Brake signal to determine when the brake pedal is applied.
When the brake pedal is applied, the BCM sends a serial data message to the ECM indicating that the brake pedal has been applied. The ECM
senses a high voltage signal on the brake switch signal circuit when the stop lamp switch is closed.
