Interior Lamp Control

The Body Control Module (SBM) controls the function of the courtesy lamps. IP junction block SBM Fuse supplies battery positive voltage (B+) at all times to the SBM inadvertent power output. Battery positive voltage (B+) is supplied to the courtesy lamps as described above. The SBM provides a ground path to the courtesy lamps from two different outputs, theatre dim- 1 and theatre dim-2. Theatre dim-1 supplies ground to lamps on CKT 156 (WHT). Theatre dim-2 supplies ground to lamps on CKT 157 (CRY). The SBM will activate these outputs when a door is open or the courtesy lamp switch is activate. The outputs are deactivated when the SBM detects that all doors are closed and the courtesy lamps switch is inactive. If the outputs are deactivated due a door closing, the outputs will be deactivated with the theatre dimming function. The theatre dimming function has the lamps gradually fade out to off over a period of three seconds. If the outputs are deactivated due to the courtesy lamps switch, the outputs will be deactivated immediately without the theatre dimming function being executed.