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 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 DTCs.
5. If the B2199-16-BATTERY VOLTAGE LOW DTC is present, repair that code before proceeding.
  Does the scan tool display; B197F-11-POWER LIFTGATE LATCH CONTROL 1 - CIRCUIT SHORT TO GROUND?
  
  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 in the latch assembly.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK FOR A BINDING LIFTGATE LATCH
1. Examine the liftgate for proper alignment, worn or binding hinges, latch alignment or anything that would cause an obstruction to proper operation.
2. With an open liftgate, manually close the latch and open it with the handle switch several times.
  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
ISOLATE AND CHECK THE (Q84) LIFTGATE LATCH CINCH DRIVER CIRCUIT FOR A SHORT TO ANOTHER CIRCUIT AT THE POWER LIFTGATE DRIVE UNIT (PLDU) HARNESS CONNECTOR
1. The ignition must be off when performing a resistance check to find a short between circuits.
2. Isolate the circuit by disconnecting the Power Liftgate Drive Unit C1 harness connector and every component containing the circuit being tested. At this time leave all in-line connectors connected. Note: Use the wiring diagram as a guide to follow the path of the circuit.
3. Connect one lead of the DVOM to the circuit being tested at the Power Liftgate Drive Unit C1 harness connector.
4. With the other lead of the DVOM probe all other circuits at the Power Liftgate Drive Unit C1 harness connector.
  NOTE:
  With the resistance between the circuit being tested and any other circuit.
  
  Is there resistance between the circuit being tested and any other circuit?
  
  Yes
  - Repair the short between the circuits that have continuity. Use the wiring diagram as a guide to trace the circuits and look for any in-line connectors to help isolate the location of the short.
  - 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 .