2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 2509

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.