2010 Cadillac Truck SRX AWD V6-3.0L Page 360
Circuit/System Verification
1. Using either the power door lock switches or the remote keyless transmitter, LOCK all doors then UNLOCK all doors. This will set the
liftgate module door lock status to unlock.
2. With the liftgate closed, select either the 3/4 or Max position on the S45B liftgate control switch-interior and activate the power open. The
liftgate should power open
3. With the liftgate open, activate the power close. The liftgate should power close
Circuit/System Testing
1. Ignition OFF, disconnect the X2 harness connector at the K39 liftgate control module.
2. Ignition ON, verify that 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. If the circuit tests normal and the
B+ fuse is open, test each of the circuits listed below for a short to ground or a faulty motor.
* Control circuit terminal 1 X1 - A23C liftgate latch assembly
* Control circuit terminal 2 X1 - A23C liftgate latch assembly
* Control circuit terminal 1 X3 - M17 liftgate motor
* Control circuit terminal 2 X3 - M17 liftgate motor
3. Ignition OFF, connect the X2 harness connector at the K39 liftgate control module and disconnect the harness connector at the M17 liftgate
motor assembly.
4. Test for less than 30k ohm between the control circuit terminal A and ground.
瀚慖f greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal,
replace the K39 liftgate control module.
5. Test for less than 30k ohm between the control circuit terminal B and ground.
瀚慖f greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal,
replace the K39 liftgate control module.
Note: Verify that the interior liftgate control switch is in the 3/4 or MAX position
6. Connect a test lamp between the control circuit terminal A and control circuit terminal B.
7. Ignition ON, with the liftgate in the open position, command the liftgate to CLOSE by pressing the B70 liftgate close switch. The test lamp
should illuminate during the CLOSE command.
瀚慖f the test lamp does not illuminate, test control circuit terminal A for a short to ground. If the circuit tests normal, replace the K39 liftgate
control module.
8. With the liftgate in the closed position, command the liftgate to OPEN by pressing the S46 liftgate handle switch. The test lamp should
illuminate during the OPEN command.
瀚慖f the test lamp does not illuminate, test control circuit terminal B for a short to ground. If the circuit tests normal, replace the K39 liftgate
control module.
9. If all circuits test normal, test or replace the M17 liftgate motor assembly.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic repair.
* Liftgate Hydraulic Pump Replacement (See: Body and Frame/Doors, Hood and Trunk/Trunk / Liftgate/Trunk / Liftgate Hydraulic
Pump/Service and Repair/Liftgate Hydraulic Pump Replacement)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for liftgate control module replacement,
programming and setup
B396C
Liftgate Interior Release Open/Close Switch Malfunction - DTC B396C or B396D
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.
