2010 Cadillac Truck SRX FWD V6-3.0L Page 573

2010 Cadillac Truck SRX FWD V6-3.0L Page 573

2. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 1 and ground.

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

3. Ignition OFF, connect the X2 harness connector K9 BCM

4. Disconnect the harness connector at the E5A backup lamp listed below:

* X3 harness connector E5E tail lamp-left (Without T79)

* X1 harness connector E5E tail lamp-left (With T79)

* X3 harness connector E5F tail lamp-right (Without T79)

* X1 harness connector E5F tail lamp-right (With T79)

5. Test for less than 30 ohm between the ground circuit terminal listed below and ground.

* E5E tail lamp-left (Without T79) ground terminal 2

* E5E tail lamp-left (With T79) ground terminal C

* E5F tail lamp-right (Without T79) ground terminal 2

* E5F tail lamp-right (With T79) ground terminal C

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

6. Connect a test lamp between the control circuit terminal listed below and ground:

* E5E tail lamp-left (Without T79) control terminal 1

* E5E tail lamp-left (With T79) control terminal D

* E5F tail lamp-right (Without T79) control terminal 1

* E5F tail lamp-right (With T79) control terminal D

7. Engine running, command the Backup Lamps ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between

the selected states.

瀚慖f the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.

瀚慖f the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace

the K9 BCM.

8. If all circuits test normal, test or replace the E5A backup lamp-left and the E5B backup lamp-right.

Repair Instructions

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

* Backup Lamp Bulb Replacement (See: Lighting and Horns/Backup Lamp/Backup Light Bulb/Service and Repair)

* Control Module References (See: Testing and Inspection/Programming and Relearning) for BCM replacement, setup and programming

B2575

DTC B2575 or B2699

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 B2575 01

- Left Headlamp Control Circuit Short to Battery

DTC B2575 02

- Left Headlamp Control Circuit Short to Ground

DTC B2575 04

- Left Headlamp Control Circuit Open

DTC B2699 01

- Right Headlamp Control Circuit Short to Battery