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Diagnosis And Testing - Horn

  1. Disconnect wire connector at horn.
  2. Using a voltmeter, connect one lead to ground terminal and the other lead to the positive wire terminal (Fig 1 ).
    HORN CONNECTOR PIN CALL-OUT

    PIN# CIRCUIT NAME
    1 GROUND
    2 HORN RELAY OUTPUT
    Fig 1: Identifying Horn Harness Connector Pin Call Out View
    G02663628Courtesy of DAIMLERCHRYSLER CORP.
  3. Depress the horn switch, battery voltage should be present.
  4. If no voltage, refer to HORN SYSTEM TEST TABLE  . If voltage is OK, go to Step 5.
  5. Using ohmmeter, test ground wire for continuity to ground.
  6. If no ground repair as necessary.
  7. If wires test OK and horn does not sound, replace horn.