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. If possible, operate the liftgate several times.
4. With the scan tool, read the Active DTCs.
  Does the scan tool display; B1949-2A-POWER LIFTGATE REAR ZONE SWITCH - STUCK?
  
  Yes
  - Go To 2
  No
  - Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals and poor pin fit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
INSPECT THE POWER LIFTGATE REAR ZONE SWITCH STICKING OR BINDING
1. Turn the ignition off.
2. Inspect the Power Liftgate Rear Zone Switch sticking or binding.
  Is the switch assembly damaged or sticking?
  
  Yes
  - Go To 3
  No
  - Replace the Power Liftgate Rear Switch in accordance with the Service Information. Refer to SWITCH, EXTERIOR HANDLE, REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE LIFTGATE REAR SWITCH FOR A SHORT
1. Disconnect the Power Liftgate Rear Switch connector.
2. Erase the DTCs.
3. Cycle the ignition off, wait 15 seconds, then cycle the ignition on.
4. With the scan tool, read the Active DTCs.
  Does the scan tool display; B1949-2A-POWER LIFTGATE REAR ZONE SWITCH - STUCK?
  
  Yes
  - Go To 4
  No
  - Replace the Power Liftgate Rear Switch in accordance with the Service Information. Refer to SWITCH, EXTERIOR HANDLE, REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
ISOLATE AND CHECK THE (G29) LIFTGATE SWITCH SIGNAL CIRCUIT FOR A SHORT TO GROUND
1. The ignition must be off when checking a circuit for continuity to ground.
2. Isolate the circuit by disconnecting the Power Liftgate Module C2 harness connector containing the circuit being tested. Note: Use the wiring diagram as a guide to follow the path of the circuit.
3. Connect the negative lead of the DVOM to a known good ground.
4. With the positive lead of the DVOM, probe the circuit being tested at the component harness connector and check for continuity between the circuit and ground.
  NOTE:
  There should be no continuity between ground and the circuit being tested.
  
  Is there continuity between ground and the circuit being tested?
  
  Yes
  - Repair the (G29) Liftgate Switch Signal circuit for a short to ground.
  - 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 .