Circuit Description

BCM receives a State Of Health (SOH) message from each module whose source ID it has learned. DTC U1040 will set when BCM does not receive a SOH message from Electronic Brake Control Module (EBCM). No driver warning message will be displayed.

Under all fault conditions, ignition switch must be cycled from LOCK/OFF to RUN position before a current code will change to a history code. A current DTC U1040 will change to a history code when BCM receives a state of health message from EBTCM. If conditions for malfunction no longer exist, history DTC will clear after 100 consecutive ignition cycles. DTC U1040 will also clear when scan tool is used to clear codes.