2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 2954
瀚慖f DTC U1511 is set in the BCM, perform the Compass Malfunction Test.
3. Perform the Window Malfunction Test.
Circuit/System Testing
Compass Malfunction Test
1. Ignition OFF, disconnect the harness connector at the electronic compass module.
2. Ignition OFF, test for less than 5.0 ohm between the ground circuit terminal 2 and ground.
瀚慖f greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify a test lamp illuminates between the ignition circuit terminal 1 and ground.
瀚慖f the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
4. Test for 6.0-7.0 V between the LIN Bus circuit terminal 3 and ground.
瀚慖f greater than the specified range, test the LIN Bus circuit for a short to voltage. If the circuit tests normal, replace the BCM.
瀚慖f less than the specified range, test the LIN Bus circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace
the BCM.
5. If all circuits test normal, replace the electronic compass module.
Window Malfunction Test
1. Ignition OFF, disconnect the harness connector at the appropriate window motor.
2. Ignition OFF, test for less than 2.0 ohm between the ground circuit terminal 4 and ground.
瀚慖f greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify a test lamp illuminates between the B+ circuit terminal 3 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.
4. Test for 6.0-7.0 V between the LIN circuit terminal 5 and ground.
瀚慖f greater than the specified range, test the LIN circuit for a short to voltage. If the circuit tests normal, replace the door module.
瀚慖f less than the specified range, test the LIN circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the
door module.
5. If all circuits test normal, replace the window motor.
Repair Instructions
Note: Each window regulator motor or front window and door lock switch, if replaced needs to be setup for proper operation.
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Front Side Door Window Regulator Motor Replacement (See: Windows and Glass/Windows/Service and Repair/Front Side Door Window
Regulator Motor Replacement)
* Rear Side Door Window Regulator Motor Replacement (See: Windows and Glass/Windows/Service and Repair/Rear Side Door Window
Regulator Motor Replacement)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for window, and door lock switches (door
modules), window regulator motors, or electronic compass module replacement, setup, and programming
U1511
DTC U1500, U1511, U1512, or U1513
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.
