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 DTC
1. With the scan tool, record and erase DTCs.
2. Turn the ignition off, wait 10 seconds, then turn the ignition on.
3. Operate the Power Liftgate several times from stop to stop if possible.
4. With the scan tool, read the Active DTCs.
  Does the scan tool display; B1969-00-POWER LIFTGATE OPEN 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, 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 .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 3
CHECK THE (Q901) LOGIC GROUND FOR AN OPEN
1. Turn the ignition off.
2. Disconnect the Power Liftgate Drive Unit harness connector.
3. Disconnect the Power Liftgate Module C2 harness connector.
4. Measure and note the resistance of the (Q901) Logic Ground circuit between the Power Liftgate Drive Unit harness connector and the Power Liftgate Module C2 harness connector.
5. Connect a jumper between the (Q901) Logic Ground circuit and ground in the Power Liftgate Drive Unit harness connector.
6. Using a 12-volt test light connected to 12 volts, check the (Q901) Logic Ground circuit at the Power Liftgate Module C2 harness connector.
  Is the resistance below 1.0 Ohm and does the test light illuminate as bright when compared to that of a direct connection to the battery?
  
  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
  - Repair the (Q901) Logic Ground circuit for an open / excessive resistance.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .