When Monitored and Set Condition:
WARNING: This page is about a different car, the 2004 Dodge Dakota. However, it is still accessible from the selected car via links, so may be relevant.
When Monitored: When the ignition is on, the PAB MUX Switch Sense circuit supplies a 3 to 10 ms pulse every 100 ms across the On or Off switch resistor to the MUX switch return circuit.
Set Condition: The code will set if the ACM senses low resistance on the PAB MUX Switch sense circuit.