2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 445

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 445

and 15.0 volts.

瀚慖f not within the specified range, refer to Charging System Test (See: Starting and Charging/Testing and Inspection/Component Tests

and General Diagnostics/Charging System Test).

2. Ignition OFF, disconnect the harness connector at the TDM. Refer to Theft Deterrent Module Replacement (See: Accessories and Optional

Equipment/Antitheft and Alarm Systems/Alarm Module/Service and Repair).

3. Ignition OFF and scan tool disconnected, open and close the driver door, and wait 1 minute. Test for less than 5 ohms between the ground

circuit terminal 3 and ground.

瀚慖f greater than the specified range, test the ground circuit for an open/high resistance.

4. Verify that a test lamp illuminates between the 12V B+ circuit terminal 1 and ground.

瀚慖f the test lamp does not illuminate, test the 12V B+ circuit for a short to ground or an open/high resistance.

5. If all circuits test normal, replace the TDM.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

Control Module References (See: Testing and Inspection/Programming and Relearning) for TDM replacement, set up, and programming.

B1428

DTC B1428

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 Descriptor

DTC B1428

- Ignition Switched Power Run/Crank Relay Circuit

Diagnostic Fault Information

Circuit/System Description

The body control module (BCM) controls the Run/Crank relay through the run/crank relay coil control circuit by applying voltage to the circuit.

The Run/Crank relay is energized when the ignition switch is in ON or START, or when a remote start is requested.

Conditions for Running the DTC

* The system voltage is between 9-16 volts.

* The DTC can only run when the output is activated.

Conditions for Setting the DTC

The BCM detects a short to ground in the run/crank relay coil control circuit.

Action Taken When the DTC Sets

The module output driver will be shut down and not supply voltage to the run/crank relay coil control circuit.

Conditions for Clearing the DTC