4. Check Horn Relay Circuit

1. Disconnect BCM connector.
2. Check continuity between BCM connector E204 terminal 127 (G/W) and horn relay connector E3-5 terminal 1 (G/W).
   1. 127 (G/W) - 1 (G/W) : Continuity should exist  .

OK or NG 

1. OK: GO TO 5.
2. NG: Repair or replace harness.

Fig 1: Checking Continuity Between BCM & Horn Relay

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