Liftgate Key Cyl Arm SW Failure

Name of Code:
Liftgate Key Cyl Arm Sw Failure

When Monitored:
Anytime battery voltage is above 10 volts and BCM is awake.

Set Condition:
The BCM senses a voltage of 4.0 volts (+/-250mV) on the Liftgate switch MUX circuit for longer than 8 seconds.

Theory of Operation:
The BCM interfaces with the power door lock, unlock, arm and disarm switches via a single wire circuit (Door Switch MUX) for each door zone. Each zone functions independently of each other. Each switch inside the door has a unique resistance value which when activated sends a voltage level to the BCM. The BCM will interpret the different levels and perform the desired function.

Possible Causes:
- Shorted liftgate key cylinder switch
- Body control module