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BODY CONTROL UNIT DESCRIPTION AND OPERATION 86-3-31 The BCU checks the status of the following inputs to determine the logic action for providing an output to the rear fog l Ignition state. l Main beam state. l Dipped beam. l Front fogs relay. l Rear fogs selected (press button, not latched). If the ignition state is crank the state of the rear fog relay is memorised and the relay is switched off. Pressing the front In the event of a communications link failure occurring while the rear fog relay is on, the rear fog relay will remain on Interior courtesy lamps l Ignition state. l Transit mode. l Driver's door open. l Passenger or rear door open. The courtesy lamps operate at full brightness when they are first switched on. The BCU then gradually dims the lamps Instrument pack Control signal Additional conditions Duration Door open - 10 minutes Unlock signal from remote transmitter All doors closed and ignition switch not in 1 minute Unlock signal from the driver's door lock All doors closed and ignition switch not in 1 minute Ignition switch turned from position II or III All doors closed 1 minute Door changed from open to closed All other doors closed and ignition switch 15 seconds Ignition switch in position III - Timer cancelled BCU receives a lock command - Timer cancelled Vehicle has transit mode enabled - 15 seconds on all occasions |