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INSPECTION PROCEDURE P-11: The hazard warning lamp switch signal is not received.
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|  CAUTION
Whenever the ECU is replaced, ensure that the input signal circuit is normal.
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| COMMENTS ON TROUBLE SYMPTOM
Input signal from the hazard warning lamp switch is used to operate the functions below. If the signal is abnormal, these functions will not work normally.
- Keyless entry system (encrypted code registration)
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| POSSIBLE CAUSES
- Malfunction of the hazard warning lamp switch
- Malfunction of the ETACS-ECU
- Damaged harness wires and connectors
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| Step 1. Connector check: C-22 hazard warning lamp switch connector Q: Is the check result normal?
YES:
Go to Step 2  .
NO:
Repair the defective connector.
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| Step 2. Check the hazard warning lamp switch.
Refer to GROUP 54A -
Hazard warning lamp switch  .
Q: Is the check result normal?
YES:
Go to Step 3 .
NO:
Replace the hazard warning lamp switch.
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| Step 3. Measure the resistance at the C-22 hazard warning lamp switch connector. - Disconnect the connector, and measure at the wiring harness side.
- Resistance between C-22 hazard warning lamp switch connector terminal No.2 and body earth
OK: 2 Ω
or less
Q: Is the check result normal?
YES:
Go to Step 5 .
NO:
Go to Step 4 .
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| Step 4. Check the wiring harness between C-22 hazard warning lamp switch connector terminal No.2 and the body earth. - Check the earth wires for open circuit.
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 5. Connector check: C-219 ETACS-ECU connector Q: Is the check result normal?
YES:
Go to Step 6 .
NO:
Repair the defective connector.
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| Step 6. Check the wiring harness between C-219 ETACS-ECU connector terminal No.55 and C-22 hazard warning lamp switch connector terminal No.1. - Check the input line for open circuit.
Q: Is the check result normal?
YES:
Go to Step 7 .
NO:
Repair the wiring harness.
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| Step 7. Retest the system.
Check that the hazard warning lamp switch signal is received 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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