Courtesy Lamp: Description and Operation

System Description

POWER SUPPLY AND GROUND
Power is supplied at all times
- to BCM terminal (105)
- through 7.5 A fuse [No. [14], located in the fuse block (J/B)].

Power is supplied at all times
- to all step lamps terminal (1)
- through 10 A fuse [No. [27], located in the fuse block (J/B)].

Ground is supplied to terminal (14) of LCU01 and LCU02 through body grounds (M14) and (M47).
Ground is also supplied to terminal (14) of LCU03 and LCU04 through body grounds (B105) and (B118) or (B22) and (B35).

OPERATING PROCEDURE
BCM is connected to LCU01, LCU02, LCU03 and LCU04 as DATA LINE A-1 or A-2. When any door switch is in OPEN position, ground is supplied
- to BCM terminal (32), (37), (33), or (28)
- through driver side, passenger side, rear LH or RH door switch.

Then BCM sends a signal to the LCU to turn on step lamp. With ground supplied, step lamp turns on.