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 3 (R/L) and ground.

Fig 1: Checking Tail Lamp Relay Control Signal

Courtesy of NISSAN MOTOR CO., U.S.A.

When lighting switch is 1ST or 2ND: Approx. 12V

When lighting switch is OFF: Approx. 0V

OK or NG

1. OK: Inspection end.
2. NG: Check harness for open or short between BCM and tail lamp relay.