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INSPECTION
PROCEDURE O-4: The horns do not sound while the security alarm is triggered. |
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|  CAUTION
Whenever the ECU is replaced,
ensure that the input and output signal circuits are normal.
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| 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.
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| POSSIBLE CAUSES
- Malfunction of the horn relay
- Malfunction of the ETACS-ECU
- Damaged harness wires and connectors
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| 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  .)
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| 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.
ECUS TO BE CHECKED
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 ."
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| 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 .
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| 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.
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| 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.
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| 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.
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| Step 7. Connector check: A-06X horn relay connector Q: Is the check result normal?
YES:
Go to Step 8 .
NO:
Repair the connector.
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| 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.
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| 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 .
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| 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.
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| 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.
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| 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.
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| Step 13. Connector check: C-305 horn switch connector Q: Is the check result normal?
YES:
Go to Step 14 .
NO:
Repair the connector.
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| 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.
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| 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 .))
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