Diagnostic Test

CHECK FOR ACTIVE DTCS
NOTE:
This DTC will only set during the releasing operation after the 4 second time out. This may make it difficult to reproduce.
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 if possible.
4. With the scan tool, read Active DTCs.
  Does the scan tool display; B196F-00-POWER LIFTGATE OPEN DIRECTION - RATCHET PRIMARY SWITCH PERFORMANCE?
  
  Yes
  - Go To 2
  No
  - Using the wiring diagram/schematic as a guide, inspect the wiring and connectors for an intermittent condition. Operate the door several times and check for any binding or other obstructions.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK FOR A BINDING LIFTGATE
1. Examine the liftgate for proper fit and alignment, loose/hard or torn seals, misaligned latch striker or anything that would cause an obstruction to proper operation.
2. Check the liftgate seal. If it is to soft or to hard it will not provide a proper "Pop-Off" when the gate is unlatched.
3. If the vehicle is Not equipped with the Passive Entry System, check for a broken or disconnected latch cable.
4. Manually operate the liftgate of a known good vehicle and notice the effort needed to open and close.
5. Compare the effort needed on the disabled liftgate.
6. Especially notice the effort needed to unlatch and close the liftgate.
  Does it take more effort to operate the liftgate than it should?
  
  Yes
  - Refer to the Service information for the related symptom(s). Refer to STANDARD PROCEDURE - LIFTGATE OPERATION .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 3
CHECK THE POWER LIFTGATE MODULE
1. With the scan tool, monitor the PRIMARY RATCHET SWITCH.
2. Using a screwdriver, click the latch to the second detent 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
  - Replace the Power Liftgate Module in accordance with Service Information. Refer to MODULE, POWER LIFTGATE (PLGM), REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 4
CHECK THE (Q901) LOGIC GROUND CIRCUIT FOR AN OPEN
1. Cycle the ignition off.
2. Cycle all lights off.
3. Disconnect the Power Liftgate Latch harness connector.
4. Measure the resistance between ground and the (Q901) Logic Ground circuit in the Power Liftgate Latch connector.
  Is the resistance below 5 Ohms?
  
  Yes
  - Go To 5
  No
  - Repair the (Q901) Logic Ground circuit for an open.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE (G78) LIFTGATE AJAR SWITCH SENSE CIRCUIT FOR AN OPEN
1. Disconnect the Power Liftgate Module C2 harness connector.
2. Measure the resistance of the (G78) Liftgate Ajar Switch Sense circuit between the Power Liftgate C2 harness connector and the Power Liftgate Latch connector.
3. Wiggle the harness while observing the Ohmmeter.
  Is the resistance below 1.0 Ohms?
  
  Yes
  - 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 .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Repair the (G78) Liftgate Ajar Switch Sense circuit for an open.
  - Test complete. Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .