Lighting Switch Input Signal Check

WARNING: This page is about a different car, the 2002 Infiniti Q45. However, it is still accessible from the selected car via links, so may be relevant.

CHECK LIGHTING SWITCH INPUT SIGNAL
With CONSULT-II
- Check Lighting switch ("HD/LMP 1ST SW") in "DATA MONITOR" mode with CONSULT-II.
  1. When lighting switch is 1ST :HD/LMP 1ST SW ON
  2. or 2ND
  3. When lighting switch is OFF :HD/LMP 1ST SW OFF
Without CONSULT-II
1. Check lighting switch in Switch monitor mode, refer to ON BOARD DIAGNOSIS .
OK or NG
1. OK >> Lighting switch is OK.
2. NG >> GO TO 2.
CHECK TAIL LAMP RELAY CONTROL SIGNAL
1. Turn ignition switch OFF.
2. Disconnect BCM connector.
3. Check voltage between BCM harness connector M4 terminal 11 (LG/B) and body ground.
  1. Condition of lighting switch Voltage [V]
  2. 1ST or 2ND : Approx. 12
  3. OFF : Approx. 0
  Fig 1: Checking Tail Lamp Relay Control Signal
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK >> Inspection end.
2. NG >> Check harness for open or short between BCM and tail lamp relay.