B1986

B1986 - Power Liftgate Latch Control 2 Circuit Open






For a complete wiring diagram, refer to.

• When Monitored: Anytime the power liftgate is performing a power cinching or releasing operation.

• Set Condition: When the power liftgate latch motor control circuit voltage is below the low voltage threshold for over 250ms.






Test Step 1 - DTC Present

• With the scan tool, record and erase DTCs.

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

• Operate the power liftgate several times if possible.

• With the scan tool, check for DTCs.

Does the scan tool display B1986 - Power Liftgate Latch Control 2 Circuit Open?

Yes

• Go to Test Step 2

No

• Using the wiring diagram/schematic as a guide, inspect the wiring and connectors for an intermittent condition. Operate the liftgate several times and check for any binding conditions in the latch assembly.

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

Test Step 2 - Check the Liftgate Latch Circuit for an Open






• Turn the ignition OFF.

• Disconnect the power liftgate module C2 harness connector.

• Measure the resistance between the liftgate latch cinch driver circuit and the liftgate latch release driver circuit.

Is the resistance approximately 4.0 ohms?

No

• Go to Test Step 3

Yes

• Replace the power liftgate module.

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

Test Step 3 - Check the Liftgate Latch Cinch Driver Circuit for an Open






• Disconnect the power liftgate latch harness connector.

• Measure the resistance of the liftgate latch cinch driver circuit between the power liftgate module C2 harness connector and the power liftgate latch harness connector.

Is the resistance less than 5.0 ohms?

Yes

• Go to Test Step 4

No

• Repair the liftgate latch cinch driver circuit for an open.

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

Test Step 4 - Check the Liftgate Latch Release Driver Circuit for an Open






• Measure the resistance of the liftgate latch release driver circuit between the power liftgate module C2 harness connector and the power liftgate latch harness connector.

Is the resistance less than 5.0 ohms?

Yes

• Replace the power liftgate latch assembly.

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

No

• Repair the liftgate latch release driver circuit for an open.

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