Accessories Body & Accessories
BCM On-Board Diagnostic System
• The on-board diagnostic system of the BCM consists of the following functions:
– Constant monitor
– Self test
– PID monitor
Constant Monitor
• The constant monitor is carried out whenever the ignition is ON. If a fault is detected, a
DTC will be stored in the BCM. When the ignition is switched off, DTCs stored by the
constant monitor will be deleted. The constant monitor only monitors the following
systems:
– Rain sensor
– Battery voltage
– BCM IC (Integrated Circuit)
Self Test
• All systems other than those tested in the constant monitor, are monitored during the
self-test. If a fault is detected, a DTC will be stored in the BCM.
• The self-test function allows BCM DTCs to be displayed on WDS. To view these,
connect WDS to the vehicle and select the option Toolbox→Self
Test→Modules→GEM.
• When the ignition is switched off, DTCs stored by the self-test will be deleted.
• To conduct the self test, the following conditions must first be met:
– Ignition switch ON
– All switches other than ignition switch OFF
– All doors, bonnet, trunk lid and liftgate are closed and unlocked
– Parking brake is engaged
09-8 Service Training Mazda6 Facelift
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