Montero XLS 4WD V6-3.5L SOHC (2001)
1. Use special tool MB991529 to connect a voltmeter between ground terminal 4 or 5 and ETACS-ECU terminal 9 of the data link connector.
2. Check that the voltmeter indicator deflects once when the input signal enters.
Q: Does the voltmeter indicator deflect?
YES: Go to Step 4.
NO: Check the relevant input signal circuit.
STEP 4. Check the seat belt warning light circuit at the ETACS-ECU connector D-224.
1. Disconnect the ETACS-ECU connector D-224 and measure at the harness side.
2. Turn the ignition switch to the "ON" position.
3. Connect terminal 39 to the ground.
Q: Does the seat belt warning light illuminate?
YES: Replace the ETACS-ECU. The seat belt warning light should work normally.
NO: Go to Step 5.
STEP 5. Check the seat belt warning light bulb.
Q: Is the seat belt warning light bulb in good condition?
YES: Go to Step 6.
NO: Replace it. The seat belt warning light should work normally.
STEP 6. Check the combination meter (printed-circuit board).
1. Remove the combination meter.
2. Remove the seat belt warning light bulb. Then measure the resistance between the bulb terminals.
