Input/Output Diagnostics

While in diagnostic mode, if certain BCM inputs are activated or deactivated, BCM will respond with various indicators. For example, if a door lock switch is pressed, or if door or rear compartment lid is opened or closed, BCM will flash fasten seatbelt indicator light and will sound an audible warning tone. BCM will also attempt to perform operation normally performed by that switch transition.

BCM also responds to changes in shock sensor or tamper input. Tamper input is activated by minor blows to vehicle, and shock input is activated by heavy blows to vehicle. Shock input can be activated by tapping on shock sensor located behind right rear wheelwell. If either input is activated, BCM will cause horns to chirp. BCM will also flash the fasten seatbelt indicator light and will sound an audible warning tone.

If interior light switch is activated or deactivated while BCM is in diagnostic mode, BCM will flash fasten seatbelt indicator light, sound an audible warning tone and flash courtesy lights. On vehicles equipped with Universal Theft Deterrent (UTD), at each interior light switch transition, BCM will cause courtesy lights to flash, horns to chirp and exterior lights to flash.