Diagnostic Test

DTC PRESENT
1. With the scan tool, record and erase DTCs.
2. Turn the ignition off, wait 10 seconds, then turn the ignition on.
3. Operate the power liftgate several times if possible.
4. With the scan tool, read DTCs.
  Does the scan tool display B1967-POWER LIFTGATE OPEN DIRECTION OVERCURRENT?
  
  Yes
  - Go to step 2
  No
  - Using the SYSTEM WIRING DIAGRAMS as a guide, inspect the wiring and connectors for an intermittent condition. Operate the liftgate several times and check for any binding conditions.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
BINDING LIFTGATE
1. Examine the liftgate for proper alignment, worn or binding hinges, weak liftgate prop assembly, or loose/hard weatherstrip for wear or anything that would cause an obstruction to proper operation. Check for the possibility of the liftgate having been overloaded due to ice or heavy snow.
2. If necessary manually operate the liftgate of a known good vehicle and notice the effort needed.
3. Compare the effort needed on the disabled vehicle.
  Were there any mechanical problems found?
  
  Yes
  - Refer to Service Information for the related symptom(s).
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
  No
  - Go To step 3
POWER LIFTGATE DRIVE UNIT HARNESS CONNECTORS
1. Disconnect all PLG Module, Latch and Liftgate Drive Unit harness connectors.
2. Inspect the PLG Module, Latch and Liftgate Drive Unit harness connectors for damaged, loose or pushed out pins, corrosion, or pinched/damaged wires.
  Were any problems found?
  
  Yes
  - Repair the wiring as necessary.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
  No
  - Go to step 4
POWER LIFTGATE DRIVE UNIT
1. Reconnect all PLG Module, Latch and Liftgate Drive Unit at this time.
2. Operate the Power Liftgate in both directions if possible.
  Does the motor start to lift the liftgate but is very slow and labors extensively?
  
  Yes
  - Replace the Power Liftgate Drive Unit assembly in accordance with Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
  No
  - Replace the Power Liftgate Module in accordance with Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .