Inspection Procedure C-17: The driver’s seat belt switch signal is
not received.
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Whenever the ECU is replaced, ensure that the input
signal circuit is normal.
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COMMENTS ON TROUBLE SYMPTOM
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Input signal from the driver’s seat belt
switch signal is used to operate the seat belt warning buzzer function and
seat belt warning lamp. If the signal is abnormal, the seat belt warning
buzzer function and seat belt warning lamp will not work normally.
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- Malfunction of the seat belt switch
- Malfunction of the ETACS-ECU
- Malfunction of the combination meter
- Damaged harness wires and connectors
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STEP 1. M.U.T.-III CAN bus diagnostics
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Use the M.U.T.-III to diagnose the CAN bus
lines.
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Q.
Is the check result normal?
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 Go to Step 2.
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 Repair
the CAN bus line (Refer to GROUP 54D - Troubleshooting  ).
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STEP 2. M.U.T.-III other system diagnosis code
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Check whether the combination meter-related
diagnosis code is set.
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Q.
Is the diagnosis code set?
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Diagnose the combination meter (Refer
to ).
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Go to Step 3.
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STEP 3. Connector check: E-22 seat belt switch connector
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Q.
Is the check result normal?
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Go to Step 4.
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Repair
the defective connector.
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STEP 4. Check the seat belt switch.
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Refer to GROUP 52A - Front seat belt .
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Q.
Is the check result normal?
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Go to Step 5.
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Replace the inner seat belt
(driver’s side).
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STEP 5. Resistance measurement at E-22 seat belt switch
connector.
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(1)Disconnect the connector, and measure at the wiring
harness side.
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(2)Resistance between E-22 seat belt switch connector
terminal No.1 and body earth
OK: Continuity exists (2 Ω
or less)
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Q.
Is the check result normal?
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Go to Step 7.
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Go to Step 6.
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STEP 6. Check the wiring harness between E-22 seat belt switch
connector terminal No.1 and body earth.
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- Check the earth wires for open circuit.
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Q.
Is the check result normal?
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Replace the inner seat belt
(driver’s side).
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Repair
the wiring harness.
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STEP 7. Connector check: D-02 combination meter connector
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Q.
Is the check result normal?
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Go to Step 8.
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Repair
the defective connector.
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STEP 8. Check the wiring harness between E-22 seat belt switch terminal
No.2 and D-02 combination meter connector terminal No.44.
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| note |
Prior to the wiring harness inspection, check
intermediate connector D-219 <RHD> or D-237 <LHD>, and
repair if necessary.
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- Check the input line for open circuit.
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Q.
Is the check result normal?
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Go to Step 9.
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Repair
the wiring harness.
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STEP 9. Retest the system.
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After the ETACS-ECU is replaced, check that the
driver’s seat belt switch signal is received.
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(1)Replace the ETACS-ECU.
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(2)Check that the driver’s seat belt switch signal is
received.
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Q.
Is the check result normal?
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The
trouble can be an intermittent malfunction (Refer to GROUP 00 - How
to Cope with Intermittent Malfunction ).
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Replace the combination
meter.
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