2010 Cadillac CTS Sedan AWD V6-3.6L Page 219
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 module.
Note: Verify that the interior liftgate control switch is in the Garage Mode or the Full Open Mode
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
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
module.
9. If all circuits test normal, test or replace the M17 liftgate motor assembly.
Component Testing
Liftgate Motor
1. Ignition OFF, disconnect the harness connector at the M17 liftgate motor assembly.
2. Install a 30 A 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 M17 liftgate motor assembly should perform the OPEN and CLOSE
functions.
瀚慖f it does not perform as specified, replace the M17 liftgate motor assembly.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the 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 module replacement, setup and
programming
B396C
DTC B396C
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 B396C 08
- Power Liftgate Mode Switch Out of Range Signal Invalid
Diagnostic Fault Information
