B18DC-2A

B18DC-2A-POWER LIFTGATE HANDLE SWITCH STUCK





For a complete wiring diagram, refer to the Wiring Information.

Theory of Operation

When the handle switch is inactive, the voltage from the module to the switch will be 5.0 volts. When the switch is pressed, the voltage will be approximately 3.3 volts. This can be verified by using the scan tool and monitoring the Handle Switch states or voltage and pressing and releasing the liftgate handle.

- When Monitored:
Whenever the Power Liftgate Module is awake.

- Set Condition:
When the Power Liftgate Module senses the Liftgate Handle Switch Mux circuit active (2.7V to 4.0V) for longer than 15 seconds, this code will set.





1. DTC PRESENT
1. With the scan tool, record the DTCs.
2. Erase the DTCs.
3. Turn the ignition off, wait 10 seconds, then turn the ignition on.
4. Operate the liftgate several times using the liftgate handle.
5. With the scan tool, read the DTCs.

Does the scan tool display; B18DC-2A-POWER LIFTGATE HANDLE 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 correct pin tension.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

2. LIFTGATE HANDLE SWITCH SHORTED




1. Disconnect the Power Liftgate Handle Switch harness connector.
2. Erase the DTCs.
3. Turn the ignition off, wait 10 seconds, then turn the ignition on.
4. Wait 15 seconds.
5. With the scan tool, read the Active DTCs.

Does the scan tool display; B18DC-2A-POWER LIFTGATE HANDLE SWITCH STUCK?

Yes

- Go To 3

No

- Check the handle and latch for any possible cause of an intermittent sticking condition. Repair as necessary. If the handle is okay, replace the Power Liftgate Handle Switch. Exterior Handle Switch - Removal.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

3. (P339) LIFTGATE HANDLE SWITCH MUX CIRCUIT SHORTED TO GROUND




1. Disconnect the Power Liftgate Module C2 harness connector.
2. Measure the resistance between ground and the (P339) Liftgate Handle Switch Mux circuit.

Is the resistance below 10K Ohms?

Yes

- Repair the (P339) Liftgate Handle Switch Mux circuit for a partial short to ground.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Go To 4

4. (P339) LIFTGATE HANDLE SWITCH MUX CIRCUIT SHORTED TO THE (Q901) LOGIC GROUND




1. Measure the resistance between the (Q901) Logic Ground circuit and the (P339) Liftgate Handle Switch Mux circuit.

Is the resistance below 10K Ohms?

Yes

- Repair the (P339) Liftgate Handle Switch Mux circuit for a short to the (Q901) Logic Ground circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Replace the Power Liftgate Module. Power Liftgate Control Module - Removal.
- Perform the BODY VERIFICATION TEST. Body Verification Test.