2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 748

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 748

1. Verify that DTC B3445, C0277, C0297, or C0890 are not set.

瀚慖f any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code

Descriptions/Diagnostic Trouble Code (DTC) List - Vehicle).

2. Ignition OFF, disconnect the harness connector of the fuel pump/trailer brake control module.

3. Ignition ON, test for greater than 11 V between the IGN 1 voltage circuit terminal 15 and ground.

瀚慖f less than the specified voltage, test the IGN 1 voltage circuit for a short to ground or an open/high resistance. If the circuit test normal

and the MISC - IGN fuse is open, test the signal circuit terminal 37 for a short to ground. If the circuit tests normal, test or replace the

RUN/CRANK relay.

4. If all the circuits test normal, replace the fuel pump/trailer brake control module.

Repair Instructions

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

* Relay Replacement (Attached to Wire Harness) (See: Power and Ground Distribution/Power Distribution Relay/Service and Repair/Relay

Replacement (Attached to Wire Harness))Relay Replacement (Within an Electrical Center) (See: Power and Ground Distribution/Power

Distribution Relay/Service and Repair/Relay Replacement (Within an Electrical Center))

* Control Module References (See: Testing and Inspection/Programming and Relearning) for fuel pump/trailer brake control module

replacement, setup, and programming

B3920

DTC B3920 or B3921

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 B3920 01

- Group 1 Seat Motors Common Circuit Short to Battery

DTC B3920 02

- Group 1 Seat Motors Common Circuit Short to Ground

DTC B3921 01

- Group 2 Seat Motors Common Circuit Short to Battery

DTC B3921 02

- Group 2 Seat Motors Common Circuit Short to Ground

Diagnostic Fault Information