2010 Cadillac Truck SRX AWD V6-2.8L Turbo 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
