WIS Document: 4018

| | B1193 Horn, open-circuit Fault symptom The horn does not work The LED flashes during the delay period Conditions Open-circuit registers diagnostic trouble code Diagnostic procedure 1 Check fuse 23 2 Check operation of the horn. | - | Connect the ISAT scan tool. | - | Select "ACTIVATE". | - | Select "HORN". | - | Select "ON". Is horn function correct? | yes Continue with point 6. | no Continue with point 3. 3 Check the horn's power supply | - | Disconnect the horn. | - | Connect the test lamp to the two 1-pin horn connectors. | - | Repeat scan tool command as point 2. When "ON" is selected, the test lamp should light. Is the test lamp on? | yes Change the horn. | no Continue with point 4. 4 Check the horn's +30 power supply Connect the test lamp across the between the 1-pin horn connector, with the red lead, and a good grounding point. The test lamp should light. Is the test lamp on? | yes Continue with point 5. | no Check circuit continuity, including the wiring between pin 1 of the connector and fuse 23. 5 Check the horn's ground connection | - | Control module, pin 11 grounds the horn when it is activated. | - | Check the continuity of the wiring harness between the horn's 1-pin connector with the black lead and control module pin 11. The resistance should be < 1 ohm. Is the resistance correct? | yes Continue with point 6. | no Repair or replace the wiring harness. 6 Check the generation of the diagnostic trouble code Erase the diagnostic trouble code, test drive the car and check to see if the diagnostic trouble code is re-registered. Is the DTC being registered? | yes See &ldquo;Before replacing a control module&rdquo; | no The remedial measures taken were correct or the fault is of intermittent nature.