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Inspection Procedure J-2

Headlight Relay (low Drive Circuit:




Connectors:






CIRCUIT OPERATION
- If the headlight switch signal from the column switch turns on, the front-ECU makes the headlights illuminate. Whenever the headlights illuminate, the low-beam lights illuminate due to the headlight dimmer switch automatic resetting function.
- If the SWS communication line is defective, the low-beam headlights will illuminate by using other signal line (headlight back-up circuit).

TECHNICAL DESCRIPTION (COMMENT)
Headlight relay (low), the column switch or the front-ECU may be defective.

NOTE: If only one of the headlights does not illuminate, the light bulb may be burned out or the harness wires between the light and the headlight relay (low-beam) may be defective. In this case, check the circuit by referring to Headlight.

TROUBLESHOOTING HINTS
- Malfunction of the headlight relay (low)
- Malfunction of the column switch (turn-signal light and lighting switch)
- Malfunction of the front-ECU
- Damaged harness wires or connectors

DIAGNOSIS
Required Special Tools:
MB991223: Test Harness Set
MB991502: Scan Tool (MUT-II)
MB991529: Diagnostic Trouble Code Check Harness

STEP 1. Check the DTC.
If the DTC sets when the ignition switch is turned "LOCK" (OFF) position, carry out the troubleshooting by referring to Diagnostic Trouble Code Chart. If the DTC does not set, go to Step 2.

STEP 2. Check the input signal.
Check the input signal from the headlight switch.






CAUTION: To prevent damage to scan tool MB991502, always turn the ignition switch to "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502.

1. Connect scan tool MB991502 to the data link connector.
2. Check that the tone alarm of scan tool MB991502 sounds when the input signal enters.





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.
If a defect appears, check the headlight switch input circuit. Refer to Inspection Procedure O-17.
If no defect appears, go to Step 3.







STEP 3. Check the headlight relay (low).
If the headlight relay (low) is damaged, replace it. The headlights (low-beam) should illuminate.
If the headlight relay (low) is not damaged, go to Step 4.




STEP 4. Check the headlight relay (low) power supply circuit at the headlight relay (low) connector A-08X.
1. Disconnect the headlight relay (low) connector A-08X and measure at the relay box side.
2. Voltage between terminal 4 and ground.
- Voltage should be approximately 12 volts (battery positive voltage).

3. Voltage between terminal 3 and ground.
- Voltage should be approximately 12 volts (battery positive voltage).
If one of the measurements above does not show approximately 12 volts, go to Step 5.
If both of the measurements above show approximately 12 volts, go to Step 7.




STEP 5. Check the headlight relay (low) connector A-08X for damage.
If the headlight relay (low) connector A-08X is damaged, repair or replace it. Refer to Harness Connector Inspection.
The headlights (low-beam) should illuminate.
If the connector is in good condition, go to Step 6.




STEP 6. Check the harness wire between headlight relay (low) connector A-08X and battery.
If the harness wire between headlight relay (low) connector A-08X and battery is damaged, repair it.
The low-beam headlights should illuminate.




STEP 7. Check the headlight relay (low) connector A-08X and front-ECU connector A-09X for damage.
If the headlight relay (low) connector A-08X and front-ECU connector are damaged, repair or replace them. Refer to Harness Connector Inspection.
The headlights (low-beam) should illuminate.
If the connectors are in good condition, go to Step 8.




STEP 8. Check the harness wire between headlight relay (low) connector A-08X and front-ECU connector A-09X.
If the harness wire between headlight relay (low) connector A-08X and front-ECU connector A-09X is damaged, repair it.
The headlights (low-beam) should illuminate.
If the harness wire is in good condition, go to Step 9.




STEP 9. Check the headlight connectors A-24 and A-35 for damage.
If the headlight connectors A-24 and A-35 are damaged, repair or replace them. Refer to Harness Connector Inspection.
The headlights (low-beam) should illuminate.
If the connectors are in good condition, go to Step 10.










STEP 10. Check the harness wires between headlight relay (low) connector A-08X and headlight connectors A-24 and A-35.

NOTE: After checking intermediate connector C-06, check the wires. If intermediate connector C-06 is damaged, repair or replace it. Refer to Harness Connector Inspection.

If the harness wires between headlight relay (low) connector A-08X and headlight connectors A-24 and A-35 are damaged, repair them.
The headlights (low-beam) should illuminate.

If the harness wires are in good condition, replace the front-ECU.
The low-beam headlights should illuminate.
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