Operating Procedure

WARNING: This page is about a different car, the 2004 Infiniti M45. However, it is still accessible from the selected car via links, so may be relevant.

BCM is connected to driver door control unit as DATA LINE A-3.

Then driver door control unit is connected to each door control unit.

When any door switch is in OPEN position, ground is supplied

to BCM terminal 33, 37, 142, or 143
through front door switch (driver or passenger side), door lock assembly rear LH or RH (door switch).

Then BCM sends a signal to the driver door control unit (LCU 01) to turn on step lamp. With ground supplied, step lamp turns on.