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INSPECTION PROCEDURE
P-18: The front fog 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 fog lamp switch is used to operate the fog lamps. If the signal
is abnormal, the front fog lamps will not illuminate and extinguish normally.
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| POSSIBLE CAUSES
- Malfunction of the fog lamp switch
- Malfunction of the ETACS-ECU
- Damaged harness wires and connectors
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| Step 1. Connector check: C-03 fog lamp switch connector Q: Is the check result normal?
YES:
Go to Step 2  .
NO:
Repair the connector.
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| Step 2. Check the lamp switch.
Refer to GROUP 54A -
Fog lamp switch  .
Q: Is the check result normal?
YES:
Go to Step 3 .
NO:
Replace the fog lamp switch.
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| Step 3. Measure the resistance at the C-03 fog lamp switch connector. - Disconnect the connector, and measure at the wiring harness side.
- Continuity between C-03 fog lamp switch connector terminal No.6 and body earth
OK: 2Ω
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-03 fog lamp switch connector
terminal No.6 and 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 connector.
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| Step 6. Check the wiring harness between C-219 ETACS-ECU connector
terminal No.54 and C-03 fog lamp switch connector terminal No.5. - 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 fog 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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