CAUTIONCOMMENTS ON TROUBLE SYMPTOM
The ETACS-ECU flashes the seat belt warning lamp in accordance with the input signal from the ignition switch (IG1).If it does not flash normally, these input signal circuit(s) or the ETACS-ECU may be defective.
POSSIBLE CAUSES
- Malfunction of the ETACS-ECU
- Damaged harness wires and connectors
DIAGNOSIS PROCEDURE
Step 1. Pulse check
| System switch |
Check condition |
|---|---|
| Ignition switch (IG1) |
When turned from ACC to ON |
OK: The MUT-II/III sounds or the voltmeter needle fluctuates.
Q: Is the check result normal?
YES:
Go to Step 2
.NO: Refer to Inspection Procedure P-2 "The ignition switch (IG1) signal is not received
."Step 3. Check the seat belt warning lamp.
- Disconnect the C-04 and C-05 combination meter connectors, and check at the equipment side.
- When a battery is connected between C-04 combination meter connector terminal No.42 and C-05 combination meter connector terminal No.5, check that the seat belt warning lamp illuminates.
Q: Is the check result normal?
YES:
Go to Step 4.NO: Replace the combination meter.
Step 4. Measure the voltage at the C-04 combination meter connector.
- Disconnect the connector, and measure at the wiring harness side.
- Voltage between C-04 combination meter connector No.42 and body earth
OK: Battery positive voltage
Q: Is the check result normal?
YES:
Go to Step 6.NO: Go to Step 5
.Step 5. Check the wiring harness between C-04 combination meter connector terminal No.42 and the ignition switch (IG1).
NOTE: Prior to the wiring harness inspection, check junction block connectors C-203 and C-205, and repair if necessary.
- Check the power supply line 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.