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Procedure 3

INSPECTION PROCEDURE 3: When the Seat Belt Is not Fastened and the Ignition Switch is Turned to the "ON" Position, the Seat Belt Tone Alarm Sounds, but the Seat Belt Warning Light does not Illuminate or Flash.

Seat Belt Warning Light Circuit:







CIRCUIT OPERATION
- The voltage from the ignition switch circuit flashes the seat belt warning light.
- The system flashes the seat belt warning light for 6 seconds after the ignition switch is turned "ON", and sounds the seat belt tone alarm if the seat belt is not fastened.

TECHNICAL DESCRIPTION (COMMENT)
There may be a malfunction of the seat belt warning light circuit or ETACS-ECU.

TROUBLESHOOTING HINTS
- Malfunction of the seat belt warning light bulb
- Malfunction of the ETACS-ECU
- Damaged wiring harnesses or connectors

DIAGNOSIS




STEP 1. Check the seat belt warning light circuit line at Junction block connector D-11.
1. Remove the ETACS-ECU and measure at the junction block side.
2. Turn the ignition switch "ON".
3. Connect terminal 11 to the ground.
The system is normal if the seat belt warning light illuminates.
4. Turn the ignition switch "OFF"

Q: Does the warning light illuminate?
YES: Replace the ETACS-ECU. Then go to Step 4.
NO: Go to Step 2.

STEP 2.Check the seat belt warning light bulb.

Q: Is the seat belt warning light bulb normal?
YES: Go to Step 3.
NO: Replace the seat belt warning light bulb. Then go to Step 4.







STEP 3. Check the harness wires between the Ignition switch (IG1) and junction block connector D-11.

NOTE: Check the intermediate connectors C-02, C-04, D-06, D-08, D-13, and then their wiring harness. If the intermediate connectors C-02, C-04, D-06, D-08, D-13 are damaged, repair or replace it. Refer to Harness Connector Inspection. Then go to Step 4.

Q: Is the harness wire between the Ignition switch (IG1) and junction block connector D-11 In good condition?
YES: Go to Step 4.
NO: Repair them. Then go to Step 4.

STEP 4. Check symptoms.

Q: The seat belt tone alarm sound, but does the seat belt warning light Illuminate or flash?
YES: This diagnosis is complete. (If no malfunctions are not found in all steps, an intermittent malfunction is suspected. Refer to How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction.)
NO: There is no action to be taken.
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