WIS Document: 4034

| | Horn Fault symptom Horn sounds continuously. Diagnostic procedure 1 Check the horn | - | Disconnect the horn. | - | Connect the test lamp between the 1-pin horn connector, with the black lead, and Batt+. Does the lamp light up? | yes Continue with point 2. | no Change the horn. 2 Check the horn's ground connection | - | Check the continuity between the 1-pin horn connector, with the black lead, and the alarm control module, pin 11. | - | Also take a resistance reading across the connector and ground. The resistance should be < 1 ohm. Is the resistance correct? | yes Continue with point 3. | no Repair or replace the wiring harness. 3 Final check Check to see if the fault symptom remains. Is the problem still present? | yes See "Before replacing a control module". | no The remedial measures taken were correct or the fault is of intermittent nature.