Input and Output Tests
LOCK TESTWhile in diagnostic mode, if either door lock switch is pressed, the BCM will flash the fasten seat belt indicator on the instrument cluster and sound an audible warning tone. The BCM will also attempt to perform the operation normally performed by the switch operation. In this case, as long as the system is functioning properly, the BCM will lock the doors. This is a way to test the door lock actuators, switches and associated wiring without removing the door trim or components.
TAMPER SENSORS TEST
The BCM will also respond to a change at either shock sensor input. The tamper input is activated by minor blows to the vehicle. The shock input is activated by heavy blows. In the diagnostic mode either the tamper input or the shock input will cause the BCM to activate the horn relay, and the horns will sound. The BCM will also flash the fasten seat belt indicator on the instrument cluster and sound an audible warning tone. An effective method of checking the shock sensor and associated wiring is to tap on the shock sensor while in the diagnostic mode.
THEFT DETERRENT OUTPUTS TEST
Switching the interior lamps switch on and off while in the diagnostic mode will cause the BCM to flash the fasten seat belt indicator on the instrument cluster, sound an audible warning tone, and flash the courtesy lamps. On vehicles equipped with theft deterrent, each transition of the interior lamps command input will cause the BCM to proceed to the next action in the following list:
1. The courtesy lamps flash
2. The horns sound
3. The exterior lights flash