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; B1886-11-LIFTGATE PINCH SENSOR - CIRCUIT SHORT TO GROUND?
  
  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 .
CHECK THE RIGHT LIFTGATE PINCH SENSOR FOR A SHORT
1. Disconnect the Right Liftgate Pinch Sensor harness connector.
2. Erase the DTCs.
3. Turn the ignition off, wait 10 seconds, then turn the ignition on.
4. With the scan tool, read the Active DTCs.
  Does the scan tool display; B1886-11-LIFTGATE PINCH SENSOR - CIRCUIT SHORT TO GROUND?
  
  Yes
  - Go To 3
  No
  - Replace the Right Liftgate Pinch Sensor in accordance with the service information. Refer to SENSOR, PINCH, REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE (Q78) RIGHT PINCH SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
1. Turn the ignition off.
2. Disconnect the Power Liftgate Module C2 harness connector.
3. Measure the resistance between ground and the (Q78) Right Pinch Sensor Signal circuit.
  Is the resistance below 20K Ohms?
  
  Yes
  - Repair the (Q78) Right Pinch Sensor Signal circuit for a short to ground.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 4
CHECK THE (Q78) RIGHT PINCH SENSOR SIGNAL CIRCUIT SHORTED TO THE (Q901) LOGIC GROUND CIRCUIT
1. Measure the resistance between the (Q78) Right Pinch Sensor Signal circuit and the (Q901) Logic Ground circuit.
  Is the resistance below 20K Ohms?
  
  Yes
  - Repair the (Q78) Right Pinch Sensor Signal circuit for a short to the (Q901) Logic 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 .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .