Diagnostic Test

WARNING: This page is about a different car, the 2017 Jeep Cherokee. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FOR ACTIVE DTCS
1. With the scan tool, record and erase the 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 the Active DTCs.
  Does the scan tool display; B196A-00-POWER LIFTGATE CLOSE DIRECTION OVER CURRENT?
  
  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, or loose/hard weatherstrip for wear or anything that would cause an obstruction to proper operation.
2. Check the struts to be sure they are not binding when the liftgate is opening or closing.
3. If necessary manually operate the liftgate of a known good vehicle and notice the effort needed.
4. Compare the effort needed on the disabled vehicle.
  Were there any mechanical problems found?
  
  Yes
  - Refer to Standard Procedures according to the Service Information, Refer to STANDARD PROCEDURE .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 3
CHECK THE (Q88) LIFTGATE OPEN DRIVER CIRCUIT FOR A SHORT TO VOLTAGE
1. Turn the ignition off.
2. Disconnect the Power Liftgate Module C1 connector.
3. Turn the ignition on.
4. Measure the voltage between ground and the (Q88) Liftgate Open Driver circuit.
  Is there any voltage present?
  
  Yes
  - Repair the (Q88) Liftgate Open Driver circuit for a short to voltage.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 4
CHECK THE (Q88) LIFTGATE OPEN DRIVER CIRCUIT SHORTED TO THE (Q89) LIFTGATE CLOSE DRIVER CIRCUIT
1. Turn the ignition off.
2. Measure the resistance between the (Q88) Liftgate Open Driver circuit and the (Q89) Liftgate Close Driver circuit.
3. Wiggle the harness and check for an intermittent shorted condition.
  NOTE:
  Be sure to use an accurate DVOM in the following step. Zero the meter before beginning.
  
  Is the resistance below 0.35 of an Ohm (should be approximately 0.5 of an Ohm)?
  
  Yes
  - Go To 5
  No
  - Go To 6
CHECK THE (Q88) LIFTGATE OPEN DRIVER WIRE SHORTED TO THE (Q89) LIFTGATE CLOSE DRIVER WIRE
1. Disconnect the Power Liftgate Drive Unit connector.
2. Measure the resistance between the (Q88) Liftgate Open Driver circuit and the (Q89) Liftgate Close Driver circuit.
3. Wiggle the harness and check for an intermittent short circuit condition.
  Is the resistance below 10K Ohms?
  
  Yes
  - Repair the (Q88) Liftgate Open Driver circuit for a short to the (Q89) Liftgate Close Driver circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Replace the Power Liftgate Drive Unit in accordance with service information. Refer to DRIVE UNIT, POWER, REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE POWER LIFTGATE DRIVE UNIT
1. Reconnect all connectors.
2. Operate the Power Liftgate in both directions if possible.
  Does the motor start to lift or lower the liftgate but moves very slow and labors extensively?
  
  Yes
  - Replace the Power Liftgate Drive Unit assembly 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 .