Diagnostic Test

CHECK FOR ACTIVE DTCS
1. With the scan tool, record and erase DTCs.
2. Cycle the ignition off, wait 10 seconds, then cycle the ignition on.
3. Operate the Power Liftgate several times from stop to stop if possible.
4. With the scan tool, read ACTIVE DTCs.
  Does the scan tool display; B196C-00-POWER LIFTGATE CLOSE DIRECTION EXCESSIVE POSITION SENSOR COUNTS?
  
  Yes
  - Go To 2
  No
  - Using the wiring diagram/schematic 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 BODY VERIFICATION TEST .
CHECK FOR A BINDING LIFTGATE
1. Examine the liftgate for proper alignment, worn or binding hinges, weak liftgate prop assembly, loose/hard weatherstrip seal, for wear or anything that would cause an obstruction to proper operation.
2. If necessary manually operate the power liftgate on a known good vehicle and notice the effort needed to open and close for comparison.
  Were there any mechanical problems found?
  
  Yes
  - Refer to Standard Procedures according to the Service Information. Refer to STANDARD PROCEDURE - LIFTGATE OPERATION .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 3
OPERATE THE POWER LIFTGATE LATCH
1. With the scan tool, monitor the SECONDARY RATCHET SWITCH CLOSED.
2. Using a screwdriver, click the latch to the closed position while observing the scan tool.
3. Unlatch the latch by pressing the handle switch and observe the scan tool for a change of state.
4. Repeat this step several times while moving the liftgate in different positions and wiggling the harness to check for an intermittent open or shorted circuit.
  Did the scan tool show the switch state changing correctly every time?
  
  Yes
  - Go To 5
  No
  - Go To 4
CHECK THE (Q76) LATCH SECONDARY POSITION SENSE CIRCUIT FOR A SHORT TO GROUND
1. Cycle the ignition off.
2. Disconnect the Power Liftgate Latch harness connector.
3. Measure the resistance between ground and the (Q76) Latch Secondary Position Sense circuit.
4. Wiggle the harness while observing the Ohmmeter.
  Is the resistance below 1K Ohm?
  
  Yes
  - Repair the (Q76) Latch Secondary Position Sense circuit for a short to ground.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Replace the Power Liftgate Latch assembly in accordance with the Service Information. Refer to LATCH, LIFTGATE, REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE POWER LIFTGATE MODULE FOR A POSITION SENSOR SIGNAL OPEN
1. Operate the liftgate from the full closed position and put an obstacle in its path to make it reverse.
  Did the liftgate reverse back to the closed position?
  
  Yes
  - Replace the Power Liftgate Drive Unit in accordance with the Service Information. Refer to DRIVE UNIT, POWER, REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Replace the Power Liftgate Module in accordance with the Service Information. Refer to MODULE, POWER LIFTGATE CONTROL (PLGM), REMOVAL .
  - Test complete. Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .