Diagnostic Test

WARNING: This page is about a different car, the 2012 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.

TEST FOR INTERMITTENT CONDITION
1. Turn the ignition on.
2. Using the scan tool, record and erase the DTCs.
3. Open the left front window.
4. Turn the ignition off and close all doors.
5. Have the FOBIK outside the car and within six (6) feet from the liftgate light bar.
6. Lock and Unlock the liftgate using the push button toggle switch on the Liftgate Lamp Bar several times.
7. Turn the ignition on.
8. Using the scan tool, read the Active DTCs.
9. Wait for three (3) minutes.
  Does the scan tool display: B25A7-00-TRUNK/LIFTGATE HANDLE SENSOR as active?
  
  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 correct pin tension.
  - Refer to STANDARD PROCEDURE and perform the BODY VERIFICATION TEST.
PEM LIFTGATE LOCK/UNLOCK SWITCH

Fig 1: Checking PEM Liftgate Lock/Unlock Switch
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off.
2. Disconnect the License Plate Lamp Bar harness connector.
3. Turn the ignition on.
4. Using the scan tool, record and erase the DTCs.
5. Using the scan tool, read the Active DTCs.
6. Wait for three (3) minutes.
  Does the scan tool display: B25A7-00-TRUNK/LIFTGATE HANDLE SENSOR as active?
  
  Yes
  - Go To 3.
  No
  - Replace the License Plate Lamp Bar in accordance with the Service Information. Refer to LAMP BAR, EXTERIOR HANDLE, REMOVAL .
  - Refer to STANDARD PROCEDURE and perform the BODY VERIFICATION TEST.
(P30) PEM LIFTGATE LOCK/UNLOCK SWITCH SENSE CIRCUIT SHORT TO GROUND

Fig 2: Checking PEM Liftgate Lock/Unlock Switch Sense Circuit Short To Ground
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off.
2. Disconnect the PEM C1 harness connector.
3. Measure the resistance between ground and the (P30) PEM Liftgate Lock/Unlock Switch Sense circuit.
  Is the resistance below 20K Ohms?
  
  Yes
  - Repair the short in the (P30) PEM Liftgate Lock/Unlock Switch Sense circuit.
  - Refer to STANDARD PROCEDURE and perform the BODY VERIFICATION TEST.
  No
  - Go To 4.
(P30) PEM LIFTGATE LOCK/UNLOCK SWITCH SENSE CIRCUIT SHORTED TO THE (P39) PEM LIFTGATE LOCK/UNLOCK SWITCH RETURN CIRCUIT
1. Measure the resistance between the (P30) PEM Liftgate Lock/Unlock Switch Sense circuit and the (P39) PEM Liftgate Lock/Unlock Switch Return circuit.
  Is the resistance below 20K Ohms?
  
  Yes
  - Repair the (P30) PEM Liftgate Lock/Unlock Switch Sense circuit for a short to the (P39) PEM Liftgate Lock/Unlock Switch Return circuit.
  - Refer to STANDARD PROCEDURE and perform the BODY VERIFICATION TEST.
  No
  - Replace the Passive Entry Module (PEM) in accordance with the Service Information. Refer to MODULE, PASSIVE ENTRY, REMOVAL .
  - Refer to STANDARD PROCEDURE and perform the BODY VERIFICATION TEST.