2010 Cadillac CTS Sedan AWD V6-3.6L Page 494

2010 Cadillac CTS Sedan AWD V6-3.6L Page 494

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Verification

Doors unlocked, observe the function of the liftgate while pressing the liftgate handle switch, the liftgate latch should release the liftgate allowing

the liftgate to be pulled open.

Circuit/System Testing

1. Ignition OFF, disconnect the X1 harness connector at the K39 liftgate module.

2. Test for less than 5 ohm between the control circuit terminal 1 and the control circuit terminal 2.

瀚慖f greater than the specified range, test either control circuit for a short to voltage or an open/high resistance. If circuits test normal, test or

replace the M31 liftgate latch assembly.

3. Verify that a test lamp does not illuminate between the control circuit terminal listed below and B+:

* Control circuit terminal 1

* Control circuit terminal 2

瀚慖f the test lamp illuminates, test the control circuit for a short to ground. If circuit tests normal, test or replace the M31 liftgate latch

assembly.

4. Install a 30A fused jumper wire between one of the control terminals and 12 V. Momentarily install a jumper wire between the other control

terminal and ground. Reverse the jumper wires at least two times, the M31 liftgate latch assembly should perform the CINCH and RELEASE

functions.

瀚慖f it does not perform as specified, replace the M31 liftgate latch assembly.

5. If all circuits test normal, replace the K39 liftgate module.

Repair Instructions

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

* Liftgate Latch Replacement (See: Body and Frame/Doors, Hood and Trunk/Trunk / Liftgate/Trunk / Liftgate Latch/Service and

Repair/Liftgate Latch Replacement)

* Control Module References (See: Testing and Inspection/Programming and Relearning) for the liftgate module replacement, setup and

programming

B2503

DTC B2503

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 B2503 00

- Trunk/Liftglass/Hatch Key Switch Circuit

Diagnostic Fault Information