B18DE

B18DE - Power Liftgate Handle Switch Circuit Low






For a complete wiring diagram, refer to.

• When Monitored: Whenever the power liftgate module is awake.

• Set Condition: When the power liftgate module senses a voltage of less than 2.0 volts on the liftgate handle switch sense circuit for longer than 20 seconds this code will set.






Test Step 1 - DTC Present

• With the scan tool, record DTCs.

• Erase DTCs

• Turn the ignition OFF, wait 10 seconds, then turn the ignition ON.

• Operate the liftgate several times.

• With the scan tool, check for DTCs.

Does the scan tool display B18DE - Power Liftgate Handle Switch Circuit Low

Yes

• Go to Test Step 2

No

• Using the wiring diagram/schematic as a guide, inspect the wiring and connectors for an intermittent condition.

• Perform the Body Verification Test. Refer to => Non-DTC Based Diagnostics. Body Interior

Test Step 2 - Liftgate Handle Switch Short






• Disconnect the power liftgate latch harness connector.

• Erase DTCs.

• Turn the ignition OFF, wait 10 seconds, then turn the ignition ON.

• With the scan tool, check for DTCs.

Does the scan tool display B18DE - Power Liftgate Handle Switch Circuit Low?

Yes

• Go to Test Step 3

No

• Replace the power liftgate latch assembly.

• Perform the Body Verification Test. Refer to => Non-DTC Based Diagnostics. Body Interior

Test Step 3 - Liftgate Handle Switch Sense Circuit Short to Ground






• Turn the ignition OFF.

• Disconnect the power liftgate module C2 harness connector.

• Measure the resistance between ground and the liftgate handle switch sense circuit.

Is the resistance less than 10k ohms?

Yes

• Repair the liftgate handle switch sense circuit for a short to ground.

• Perform the Body Verification Test. Refer to => Non-DTC Based Diagnostics. Body Interior

No

• Go to Test Step 4

Test Step 4 - Liftgate Handle Switch Sense Circuit Short to Logic Ground






• Measure the resistance between the logic ground circuit and the liftgate handle switch sense circuit.

Is the resistance less than 10k ohms?

No

• Replace the power liftgate module.

• Perform the Body Verification Test. Refer to => Non-DTC Based Diagnostics. Body Interior

Yes

• Repair the liftgate handle switch sense circuit for a short to the logic ground circuit.

• Perform the Body Verification Test. Refer to => Non-DTC Based Diagnostics. Body Interior