[54C] SMART WIRING SYSTEM (SWS) USING SWS MONITOR <Hong Kong spec.> - - SYMPTOM PROCEDURES - SECURITY-ALARM SYSTEM - INSPECTION PROCEDURE O-4: The horns do not sound while the security alarm is triggered. | PRINT PAGE / INDEX / PRIOR / NEXT

INSPECTION PROCEDURE O-4: The horns do not sound while the security alarm is triggered.
| CAUTION Whenever the ECU is replaced, ensure that the input and output signal circuits are normal.
| COMMENTS ON TROUBLE SYMPTOM If the horns do not sound, the horn input signal circuit or the ETACS-ECU may be defective. Alternatively, it is possible that "SECURITY ALM" was set to "W/O FUNCTION" by using the adjustment function.
| POSSIBLE CAUSES Malfunction of the horns Malfunction of the horn relay Malfunction of the ETACS-ECU Damaged harness wires and connectors
| DIAGNOSIS PROCEDURE
| Step 1. Check the adjustment function. Check that "SECURITY ALM" is set to "HORN/HAZARD" by using the adjustment function. Q: Is the check result normal? YES: Go to Step 2. NO: Set "SECURITY ALM" to "HORN/HAZARD" by using the adjustment function.(Refer to .)
| Step 2. ECU check on the SWS monitor Check that the power supply and earth lines to the ETACS-ECU and the SWS communication lines are normal. Ignition switch: OFF ECUS TO BE CHECKED ETACS ECU OK: "OK" is displayed on the "ETACS ECU" menu. Q: Is the check result normal? YES: Go to Step 3. NO: Refer to Inspection Procedure A-3 "Communication with the ETACS-ECU is not possible ."
| Step 3. Check that the horns sound. Check that the horns sound normally. Q: Is the check result normal? YES: Go to Step 4. NO: Go to Step 7.
| Step 4. Connector check: A-06X horn relay connector, C-220 ETACS-ECU connector Q: Is the check result normal? YES: Go to Step 5. NO: Repair the connector.
| Step 5. Check the wiring harness between A-06X horn relay connector terminal No. 3 and C-220 ETACS-ECU connector terminal No. 44. NOTE: Prior to the wiring harness inspection, check intermediate connector C-116, and repair if necessary. Check the output lines for open or short circuit. Q: Is the check result normal? YES: Go to Step 6. NO: Repair the wiring harness.
| Step 6. Retest the system. Check that the security alarm works normally. Q: Is the check result normal? YES: The trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope with Intermittent Malfunction ). NO: Replace the ETACS-ECU.
| Step 7. Connector check: A-06X horn relay connector Q: Is the check result normal? YES: Go to Step 8. NO: Repair the connector.
| Step 8. Check the horn relay. Refer to GROUP 54A - Horn . Q: Is the check result normal? YES: Go to Step 9. NO: Replace the horn relay.
| Step 9. Measure the voltage at A-06X horn relay connector. Remove the relay, and measure at the relay box side. Voltage between A-06X horn relay connector (terminals 1 and 2) and body earth OK: Battery positive voltage Q: Is the check result normal? YES: Go to Step 11. NO: Go to Step 10.
| Step 10. Check the wiring harness between A-06X horn relay connector (terminal Nos. 1 and 2) and the battery. Q: Is the check result normal? YES: The trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope with Intermittent Malfunction ). NO: Repair the wiring harness.
| Step 11. Connector check: A-22 horn (HI) connector, A-23 horn (LO) connector Q: Is the check result normal? YES: Go to Step 12. NO: Repair the connector.
| Step 12. Check the wiring harness from terminal No.1 of A-22 horn (HI) connector and A-23 horn (LO) connector to horn relay connector terminal No.4. Q: Is the check result normal? YES: Go to Step 13. NO: Repair the wiring harness.
| Step 13. Connector check: C-305 horn switch connector Q: Is the check result normal? YES: Go to Step 14. NO: Repair the connector.
| Step 14. Check the wiring harness between A-06X horn relay connector terminal No. 3 and C-305 horn switch connector terminal No. 1. NOTE: Prior to the wiring harness inspection, check clock spring connector C-308 and intermediate connector C-116, and repair if necessary. Check the output lines for open or short circuit. Q: Is the check result normal? YES: Go to Step 15. NO: Repair the wiring harness.
| Step 15. Replace the horns. Replace the horns. Check that the security alarm works normally. Q: Is the check result normal? YES: The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ). NO: Replace the driver's side air bag module. (Refer to GROUP 52B - Air bag module and clock spring .))

[54C] SMART WIRING SYSTEM (SWS) USING SWS MONITOR <Hong Kong spec.> - - SYMPTOM PROCEDURES - SECURITY-ALARM SYSTEM - INSPECTION PROCEDURE O-4: The horns do not sound while the security alarm is triggered. | PRINT PAGE / INDEX / PRIOR / NEXT

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