Diagnostic Test

CHECK FOR AN ACTIVE DTC
1. Turn the ignition on.
2. With the scan tool, create a Vehicle Scan Report and attach it to the repair order.
3. Erase DTCs.
4. Turn the ignition off, wait 10 seconds, then turn the ignition on.
5. Operate the power liftgate several times if possible.
6. With the scan tool, read the PLGM DTCs.
  Is the DTC active?
  
  Yes
  - Go To 2
  No
  - Perform the TESTING FOR AN INTERMITTENT CONDITION procedure. Refer to TESTING FOR AN INTERMITTENT CONDITION .
CHECK FOR A BINDING LIFTGATE LATCH
1. Examine the liftgate for proper alignment, worn or binding hinges, latch alignment or anything that would cause an obstruction to proper operation.
2. With an open liftgate, manually close the latch and open it with the handle switch several times.
  Were there any mechanical problems found?
  
  Yes
  - Refer to the Service information for the related symptom(s). Refer to POWER LIFTGATE, STANDARD PROCEDURE .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 3
CHECK THE (Q74) LIFTGATE LATCH CINCH DRIVER CIRCUIT FOR A SHORT TO THE (Q901) LOGIC GROUND
1. Turn the ignition off.
2. Disconnect the Power Liftgate Latch connector.
3. Check for continuity between the (Q901) Logic Ground circuit and the (Q74) Liftgate Latch Cinch Driver circuit at the Power Liftgate Latch harness connector.
4. Wiggle the harness and check for an intermittent short circuit condition.
  Is there continuity between the (Q901) Logic Ground circuit and the (Q74) Liftgate Latch Cinch Driver circuit?
  
  Yes
  - Go To 6
  No
  - Go To 4
CHECK THE (Q92) LIFTGATE LATCH MOTOR (+) CIRCUIT FOR A SHORT TO THE (Q901) LOGIC GROUND
1. Check for continuity between the (Q901) Logic Ground circuit and the (Q92) Liftgate Latch Motor (+) circuit in the latch connector.
2. Wiggle the harness and check for an intermittent short circuit condition.
  Is the resistance below 10.0 Ohms?
  
  Yes
  - Go To 6
  No
  - Go To 5
CHECK THE (Q74) LIFTGATE LATCH CINCH DRIVER CIRCUIT FOR A SHORT TO THE (Q92) LIFTGATE LATCH MOTOR (+) CIRCUIT
1. Disconnect the PLGM C2 harness connector.
2. Check for continuity between the (Q74) Liftgate Latch Cinch Driver circuit and the (Q92) Liftgate Latch Motor (+) circuit at the PLGM C2 connector.
  Is there continuity between the (Q74) Liftgate Latch Cinch Driver circuit and the (Q92) Liftgate Latch Motor (+) circuit?
  
  Yes
  - Repair the (Q74) Liftgate Latch Cinch Driver circuit for a short to the (Q92) Liftgate Latch Motor (+) circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Replace the Power Liftgate Latch assembly in accordance with the Service Information and using the scan tool, run the "Latch Home Sector Test". Refer to LATCH, LIFTGATE, REMOVAL AND INSTALLATION .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE (Q92) LIFTGATE LATCH MOTOR (+) CIRCUIT FOR A SHORT TO GROUND
1. Disconnect the PLGM C2 harness connector.
2. Check for continuity between ground and the (Q92) Liftgate Latch Motor (+) circuit at the PLGM C2 connector.
3. Wiggle the harness and check for an intermittent short circuit condition.
  Is there continuity between ground and the (Q92) Liftgate Latch Motor (+) circuit?
  
  Yes
  - Repair the (Q92) Liftgate Latch Motor (+) circuit for a short to ground.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 7
CHECK THE (Q74) LIFTGATE LATCH CINCH DRIVER CIRCUIT FOR A SHORT TO GROUND
1. Check for continuity between ground and the (Q74) Liftgate Latch Cinch Driver circuit at the PLGM C2 connector.
2. Wiggle the harness and check for an intermittent short circuit condition.
  Is there continuity between ground and the (Q74) Liftgate Latch Cinch Driver circuit?
  
  Yes
  - Repair the (Q74) Liftgate Latch Cinch Driver circuit for a short to ground.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 8
CHECK RELATED HARNESS CONNECTIONS
1. Disconnect all PLGM harness connectors.
2. Disconnect all related in-line harness connections (if equipped).
3. Disconnect the related component harness connectors.
4. Inspect harness connectors, component connectors, and all male and female terminals for the following conditions:
  - Proper connector installation.
  - Damaged connector locks.
  - Corrosion.
  - Other signs of water intrusion.
  - Weather seal damage (if equipped).
  - Bent terminals.
  - Overheating due to a poor connection (terminal may be discolored due to excessive current draw).
  - Terminals that have been pushed back into the connector cavity.
  - Perform a terminal drag test on each connector terminal to verify proper terminal tension.
  Repair any conditions that are found.
5. Reconnect all PLGM harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
6. Reconnect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
7. Reconnect all related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
8. With the scan tool, erase DTCs.
9. Using the recorded Vehicle Scan Report, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
10. With the scan tool, read PLGM DTCs.
  Did the DTC return?
  
  Yes
  - Replace the Power Liftgate Module (PLGM) in accordance with the Service Information. Refer to MODULE, POWER LIFTGATE (PLGM), REMOVAL AND INSTALLATION .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  - Test complete.