Symptom Related Diagnostic Procedures
POWER LIFTGATE PEM LOCK SWITCH INOPERATIVE
For a complete wiring diagram, refer to the Wiring Information.
NOTE: This test is used when there is a malfunction with the PEM Lock/Unlock Switch on the License Plate Lamp Bar.
1. PEM LIFTGATE LOCK/UNLOCK CIRCUITS SHORTED TOGETHER
1. Turn the ignition off.
2. Disconnect the Passive Entry Module C1 harness connector.
3. Measure the resistance between the (P30) PEM Liftgate Lock/Unlock Switch Sense circuit and the (P39) PEM Liftgate Lock/Unlock Switch Return circuit in the PEM C1 harness connector.
Is the resistance below 20K Ohms?
Yes
- Go To 2
No
- Go To 3
2. (P39) PEM LIFTGATE LOCK/UNLOCK SWITCH RETURN CIRCUIT SHORTED TO THE (P30) PEM LIFTGATE LOCK/UNLOCK SWITCH SENSE CIRCUIT
1. Disconnect the License Plate Lamp Bar harness connector.
2. Measure the resistance between the (P39) PEM Liftgate Lock/Unlock Switch Return circuit and the (P30) PEM Liftgate Lock/Unlock Switch Sense circuit in the License Plate Lamp Bar harness connector.
Is the resistance below 20K Ohms?
Yes
- Repair the short between the (P39) PEM Liftgate Lock/Unlock Switch Return circuit and the (P30) PEM Liftgate Lock/Unlock Switch Sense circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.
No
- Replace the License Plate Lamp Bar Assembly. Exterior Handle Lamp Bar - Removal.
- Perform the BODY VERIFICATION TEST. Body Verification Test.
3. PEM LIFTGATE LOCK/UNLOCK CIRCUIT SHORTED TO GROUND
1. Measure the resistance between ground and the (P30) PEM Liftgate Lock/Unlock Switch Sense circuit in the PEM C1 harness connector.
2. Measure the resistance between ground and the (P39) PEM Liftgate Lock/Unlock Switch Return circuit in the PEM C1 harness connector.
Is the resistance below 20K Ohms in either or both circuits?
Yes
- Go To 4
No
- Go To 6
4. (P30) PEM LIFTGATE LOCK/UNLOCK SWITCH SENSE CIRCUIT SHORTED TO GROUND
1. Disconnect the License Plate Lamp Bar harness connector.
2. Measure the resistance between ground and the (P30) PEM Liftgate Lock/Unlock Switch Sense circuit in the License Plate Lamp Bar harness connector.
Is the resistance below 20K Ohms?
Yes
- Repair the short to ground in the (P30) PEM Liftgate Lock/Unlock Switch Sense circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.
No
- Go To 5
5. (P39) PEM LIFTGATE LOCK/UNLOCK SWITCH RETURN CIRCUIT SHORTED TO GROUND
1. Measure the resistance between ground and the (P39) PEM Liftgate Lock/Unlock Switch Return circuit in the License Plate Lamp Bar harness connector.
Is the resistance below 20K Ohms?
Yes
- Repair the short to ground in the (P39) PEM Liftgate Lock/Unlock Switch Return circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.
No
- Replace the License Plate Lamp Bar Assembly. Exterior Handle Lamp Bar - Removal.
- Perform the BODY VERIFICATION TEST. Body Verification Test.
6. PEM LIFTGATE LOCK/UNLOCK CIRCUIT OPEN
1. Measure the resistance between the (P30) PEM Liftgate Lock/Unlock Switch Sense circuit and the (P39) PEM Liftgate Lock/Unlock Switch Return circuit in the PEM C1 harness connector.
2. While measuring the resistance have a helper press and hold the PEM Liftgate Lock/Unlock switch button.
Is the resistance between 350 and 430 Ohms when the switch is pressed?
Yes
- Go To 9
No
- Go To 7
7. (P30) PEM LIFTGATE LOCK/UNLOCK SWITCH SENSE CIRCUIT OPEN
1. Disconnect the License Plate Lamp Bar harness connector.
2. Measure the resistance of the (P30) PEM Liftgate Lock/Unlock Switch Sense wire between the PEM C1 harness connector and the License Plate Lamp Bar harness connector.
Is the resistance below 2.0 Ohms?
Yes
- Go To 8
No
- Repair the open in the (P30) PEM Liftgate Lock/Unlock Switch Sense circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.
8. (P39) PEM LIFTGATE LOCK/UNLOCK SWITCH RETURN CIRCUIT OPEN
1. Measure the resistance of the (P39) PEM Liftgate Lock/Unlock Switch Return circuit between the PEM C1 harness connector and the License Plate Lamp Bar harness connector.
Is the resistance below 2.0 Ohms?
Yes
- Replace the License Plate Lamp Bar Assembly. Exterior Handle Lamp Bar - Removal.
- Perform the BODY VERIFICATION TEST. Body Verification Test.
No
- Repair the open in the (P39) PEM Liftgate Lock/Unlock Switch Return circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.
9. PEM LIFTGATE LOCK/UNLOCK CIRCUIT SHORTED TO VOLTAGE
1. Turn the ignition on.
2. Measure the voltage between ground and the (P30) PEM Liftgate Lock/Unlock Switch Sense circuit in the PEM C1 harness connector.
3. Measure the voltage between ground and the (P39) PEM Liftgate Lock/Unlock Switch Return circuit in the PEM C1 harness connector.
Is there any voltage present in either or both circuits?
Yes
- Go To 10
No
- Go To 12
10. (P39) PEM LIFTGATE LOCK/UNLOCK SWITCH RETURN CIRCUIT SHORTED TO VOLTAGE
1. Disconnect the License Plate Lamp Bar harness connector.
2. Measure the voltage between ground and the (P39) PEM Liftgate Lock/Unlock Switch Return circuit in the License Plate Lamp Bar harness connector.
Is there any voltage present?
Yes
- Repair the short to voltage in the (P39) PEM Liftgate Lock/Unlock Switch Return circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.
No
- Go To 11
11. (P30) PEM LIFTGATE LOCK/UNLOCK SWITCH SENSE CIRCUIT SHORTED TO VOLTAGE
1. Measure the voltage between ground and the (P30) PEM Liftgate Lock/Unlock Switch Sense circuit in the License Plate Lamp Bar harness connector.
Is there any voltage present?
Yes
- Repair the short to voltage in the (P30) PEM Liftgate Lock/Unlock Switch Sense circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.
No
- Replace the License Plate Lamp Bar Assembly. Exterior Handle Lamp Bar - Removal.
- Perform the BODY VERIFICATION TEST. Body Verification Test.
12. PEM LIFTGATE LOCK/UNLOCK SWITCH SHORTED TO VOLTAGE
1. Turn the ignition off.
2. Re-connect the License Plate Lamp Bar harness connector.
3. Turn the ignition on.
4. While measuring the voltage in the following step, have a helper press and hold the PEM Liftgate Lock/Unlock Switch button.
5. Measure the voltage between ground and the (P30) PEM Liftgate Lock/Unlock Switch Sense circuit in the PEM C1 harness connector.
6. Measure the voltage between ground and the (P39) PEM Liftgate Lock/Unlock Switch Return circuit in the PEM C1 harness connector.
Is there any voltage present in either or both circuits while the switch is being pressed?
Yes
- Replace the License Plate Lamp Bar Assembly. Exterior Handle Lamp Bar - Removal.
- Perform the BODY VERIFICATION TEST. Body Verification Test.
No
- Replace the Passive Entry Module. Passive Entry Module - Removal.
- Perform the BODY VERIFICATION TEST. Body Verification Test.