Seat Belt Buckle Switch Check

1. Turn ignition switch "ON".
2. Check voltage between smart entrance control unit terminal 22 and ground.
   Fig 1: Checking Seat Belt Buckle Switch Input Signal

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

   Voltage [V]: 

   Condition of seat belt buckle switch: Fastened Approx. 12 

   Condition of seat belt buckle switch: Unfastened 0 

OK or NG 

1. OK: Seat belt buckle switch is OK.
2. NG: GO TO 2.

Check continuity between terminals 1 and 2 when seat belt is fastened and unfastened.

Fig 2: Checking Seat Belt Buckle Switch

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

Continuity 

Seat belt is fastened. No 

Seat belt is unfastened. Yes 

OK or NG 

1. OK: Check the following. 

   Seat belt buckle switch ground circuit

   Harness for open or short between smart entrance control unit and seat belt buckle switch

2. NG: Replace seat belt buckle switch.