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Check Horn Circuit

  1. CHECK HORN CHIRP FUNCTION 

    With CONSULT-II 

    1. Check horn function "HORN" in "ACTIVE TEST" mode with CONSULT-II.
    2. Perform operation shown on display.

      Horn should sound. 

      Fig 1: CONSULT-II Display - Active Test
      G04129445Courtesy of NISSAN MOTOR CO., U.S.A.

    Without CONSULT-II 

    1. Turn ignition switch OFF.
    2. Disconnect BCM connector.
    3. Apply ground to BCM connector E204 terminal 127.

      Horn should sound. 

    OK or NG 

    • OK : Horn alarm is OK.
    • NG : GO TO 2.
      Fig 2: Applying Ground To BCM Connector E204 Terminal 127
      G04129446Courtesy of NISSAN MOTOR CO., U.S.A.
  2. CHECK HORN RELAY 

    Check horn relay condition.

    OK or NG 

    • OK : GO TO 3.
    • NG : Replace horn relay.
  3. CHECK POWER SUPPLY FOR HORN RELAY 
    1. Turn ignition switch OFF.
    2. Disconnect horn relay connector.
    3. Check voltage between horn relay connector E3-5 terminal 2 and ground.

      2 - Ground : Battery voltage. 

    OK or NG 

    • OK : GO TO 4.
    • NG : Check the following.
      • 15A fuse [No. 56, located in the fuse, fusible link and relay block (J/B)]
      • Harness for open or short between horn relay and fuse
        Fig 3: Checking Voltage Between Horn Relay Connector E3-5 Terminal 2 And Ground
        G04129447Courtesy of NISSAN MOTOR CO., U.S.A.
  4. CHECK HORN RELAY CIRCUIT 
    1. Disconnect BCM connector.
    2. Check continuity between BCM connector E204 terminal 127and horn relay connector E3-5 terminal 1.

      127 (G/W) - 1 (G/W) : Continuity should exist. 

    OK or NG 

    • OK : GO TO 5.
    • NG : Repair or replace harness.
      Fig 4: Checking Continuity Between BCM Connector E204 Terminal 127 And Horn Relay Connector E3-5 Terminal 1
      G04129448Courtesy of NISSAN MOTOR CO., U.S.A.
  5. CHECK HORN RELAY CIRCUIT 
    1. Disconnect horn relay and horn high or low connector.
    2. Check continuity between horn relay connector E3-5 terminal 3 and horn connector E43 (low), E63 (high) terminal 1.

      LOW 

      3 - 1 (G) : Continuity should exist. 

      HIGH 

      3 - 1 (G/OR) : Continuity should exist. 

    OK or NG 

    • OK : GO TO 6.
    • NG : Repair or replace harness.
      Fig 5: Checking Continuity Between Horn Relay Connector E3-5 Terminal 3 And Horn Connector E43 (Low), E63 (High) Terminal 1
      G04129449Courtesy of NISSAN MOTOR CO., U.S.A.
  6. CHECK HORN AND HORN GROUND 

    Apply battery voltage to horn terminal 1.

    Horn should sound. 

    OK or NG 

    • OK : Replace BCM.
    • NG : Replace horn or repair horn ground.
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