Diagnostic Test

CHECK FOR PCM DTCS
NOTE:
Make sure the battery is fully charged and serviceable before proceeding.
1. With the scan tool, read the PCM DTCs.
  Are there any PCM Battery or Charging System DTCs present?
  
  Yes
  - Refer to DTC INDEX and perform the appropriate Diagnostic Procedure.
  No
  - Go To 2.
CHECK FOR AN ACTIVE DTC
1. With the scan tool, create a Vehicle Scan Report and attach it to the repair order.
2. Start the engine and run for two minutes.
3. With the scan tool, read PLGM Active DTCs.
  Is the DTC active?
  
  Yes
  - Go To 3
  No
  - Perform the TESTING FOR AN INTERMITTENT CONDITION procedure. Refer to TESTING FOR AN INTERMITTENT CONDITION .
CHECK THE (A111) FUSED B(+) CIRCUIT FOR AN OPEN OR HIGH RESISTANCE
1. Turn the ignition off.
2. Disconnect the PLGM C2 harness connector.
3. Start the engine.
4. Measure the voltage between ground and the (A111) Fused B(+) circuit at the Power Liftgate C2 connector.
5. Compare the voltage read at the PLGM C2 connector with a direct connection at the battery.
  Is the voltage at the PLGM C2 connector within 0.5 of a volt of the battery voltage?
  
  Yes
  - Go To 4
  No
  - Repair the (A111) Fused B(+) circuit for an open or high resistance.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE (Z924) GROUND CIRCUIT FOR AN OPEN OR HIGH RESISTANCE
1. Turn the ignition off.
2. Using a 12 volt test light, connect one end to the (A111) Fused B(+) circuit and the other end to the (Z924) Ground in the Liftgate C2 harness connector.
  NOTE:
  The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.
  
  Does the test tight illuminate brightly?
  
  Yes
  - Go To 5
  No
  - Repair the (Z924) Ground circuit for an open or high resistance.
  - Perform BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
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.