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INSPECTION
PROCEDURE C-4: The Impact Detection Door Unlock Function does not Function. |
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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 impact detection door unlock function does not work normally, the input signal
circuit from the impact detection sensor, the SRS-ECU or the ETACS-ECU may be defective.
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| POSSIBLE CAUSES
- Malfunction of the SRS-ECU
- Malfunction of the ETACS-ECU
- Damaged harness wires and connectors
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| Step 1. Use the MUT-II/III to confirm a diagnosis code.
Check that the SRS-ECU sets a diagnosis code.
Q: Is the check result normal?
YES:
Go to Step 2  .
NO:
Refer to GROUP 52B -
Troubleshooting  .
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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. Connector check: C-115 SRS-ECU connector Q: Is the check result normal?
YES:
Go to Step 4 .
NO:
Repair the defective connector.
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| Step 4. Check the SRS-ECU.
Check that the SRS-ECU works normally. Refer to GROUP 52B, SRS Control Unit (SRS-ECU) .
Q: Is the check result normal?
YES:
Go to Step 5 .
NO:
Replace the SRS-ECU.
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| Step 5. Connector check: C-220 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-115 SRS-ECU connector terminal
No. 14 and C-220 ETACS-ECU connector terminal No. 29. - Check the power supply line for open or short circuit.
Q: Is the check result normal?
YES:
Go to Step 7 .
NO:
Repair the wiring harness.
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| Step 7. Measure the resistance at the C-115 SRS-ECU connector. - Disconnect the connector, and measure at the wiring harness
side.
- Resistance between C-115 SRS-ECU connector terminal No. 15 and body earth
OK: 2 Ω
or less
Q: Is the check result normal?
YES:
Go to Step 9 .
NO:
Go to Step 8 .
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| Step 8. Check the wiring harness between C-115 SRS-ECU connector terminal
No. 15 and body earth. - Check the earth line for open or short 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 9. Retest the system.
Check that the impact detection door unlock function 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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