B18E4

B18E4 - Power Liftgate Front Zone Switch Circuit High






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 over 5.1 volts on the liftgate switch sense circuit for longer than 10 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 from the switch bank.

• With the scan tool, check for DTCs.

Does the scan tool display B18E4 - Power Liftgate Front Zone Switch Circuit High?

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 Release Switch Short






• Disconnect the switch bank 2 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 B18E4 - Power Liftgate Front Zone Switch Circuit High?

Yes

• Go to Test Step 3

No

• Replace the switch bank assembly.

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

Test Step 3 - Liftgate Switch Sense Circuit Short to Voltage






• Disconnect the power liftgate module C2 harness connector.

• Measure the voltage between ground and the liftgate switch sense circuit.

Is there any voltage present?

No

• Go to Test Step 4

Yes

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

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

Test Step 4 - Liftgate Switch Sense Circuit Open






• Turn the ignition OFF.

• Measure the resistance of the liftgate switch sense circuit between the switch connector and the power liftgate C2 harness connector.

Is the resistance less than 2.0 ohms?

No

• Repair the liftgate switch sense circuit for an open.

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

Yes

• Replace the power liftgate module.

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