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BODY CONTROL UNIT DESCRIPTION AND OPERATION 86-3-23 The BCU checks the status of the following inputs to determine when to provide the rear window enable and sunroof l Ignition state. l Driver's door open. l Passenger or rear door open. The rear window enable and sunroof enable lines are on when the ignition switch is in position II, and are switched The BCU monitors the circuit current draw when the windows are operating to detect the occurrence of a stall If the BCU detects that it has been operating the same window motor in one direction for more than 10 ± 0.2 seconds, without the BCU detecting a stall condition or the control switch being released, it will automatically stop operation of One touch mode automatically lowers the window to its fully open position, without the need for the window switch to ± 0.2 second. One touch mode continues to lower the window until the BCU detects: l A stall condition exists (window has reached bottom of travel). l Window switch is repressed in either direction for more than 0.4 ± 0.2 second. l The BCU has operated the motor for a period greater than 10 ± 0.2 seconds. A timeout function is included which allows the windows and sunroofs to be operated for a period of 44 ± 1 seconds after the ignition key has been removed from the ignition switch. The timeout function will be cancelled if the BCU l The driver's door has been closed after the ignition has been switched off. l Any door open after the ignition is switched off. The preconditions are programmed into the BCU dependent on market specification. The BCU does not directly control rear window operation, but it can request the IDM to remove the power feed to the In the event of a communications link failure occurring while rear window enable is on, the relay remains on until the |