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Inspection Procedure K-1

Turn-signal Light Drive Circuit:




Connectors:






CIRCUIT OPERATION
If the ETACS-ECU receives a signal from the turn-signal light switch, the flasher timer circuit (which is incorporated in the ETACS-ECU) marks the turn-signal lights flash.

TECHNICAL DESCRIPTION (COMMENT)
The ETACS-ECU makes the turn-signal lights flash, based on the input signals from the following switches:
- Ignition switch (IG1)
- Turn-signal light switch
If the turn-signal lights do not flash normally, a defect on the relevant circuits or the ETACS-ECU may be suspected.
If the hazard warning lights also do not flash, a defect in the ETACS-ECU power supply line specific to the turn-signal lights is suspected.

NOTE: If only one of the turn-signals lights does not flash, the light bulb may be burned out or the harness wires between the ETACS-ECU and the light may be defective. In this case, check the circuit by referring to Turn-signal Light and Hazard Warning Light.

TROUBLESHOOTING HINTS
- Malfunction of the column switch (turn-signal light and lighting switch)
- Malfunction of the ETACS-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 hazard warning light operation.
If the hazard warning lights do not work normally, go to Step 2.
If the hazard warning lights work normally, go to Step 8.

STEP 2. Check the turn-signal light state.
If only one side of the turn-signal lights does not flash, go to Step 3.
If neither of the turn-signal lights flashes, go to Step 5.







STEP 3. Check the ETACS-ECU connector C-114 and junction block connectors C-104, C-107 and C-109 for damage.
If the ETACS-ECU connector C-114 and junction block connectors C-104, C-107 and C-109 are damaged, repair or replace them. Refer to Harness Connector Inspection.
The turn-signal lights should flash normally.
If the connectors are in good condition, go to Step 4.







STEP 4. Check the harness wires between ETACS-ECU connector C-114 and junction block connectors C-104, C-107 and C-109.
If the harness wires between ETACS-ECU connector C-114 and junction block connectors C-104, C-107 and C-109 are damaged, repair them.
The turn-signal lights should flash normally.
If the harness wires are in good condition, replace the ETACS-ECU.
The turn-signal lights should flash normally.




STEP 5. Check the ETACS-ECU power supply circuit (turn-signal light) at the ETACS-ECU connector C-114.
1. Disconnect the ETACS-ECU connector C-114 and measure at the junction block side.
2. Voltage between terminal 18 and ground.
- Voltage should be approximately 12 volts (battery positive voltage).
If not approximately 12 volts, go to Step 6.
If approximately 12 volts, replace the ETACS-ECU.
The turn-signal lights should flash normally.




STEP 6. Check the ETACS-ECU connector C-114 for damage.
If the ETACS-ECU connector C-114 is damaged, repair or replace it. Refer to Harness Connector Inspection.
The turn-signal lights should flash normally.
If the connector is in good condition, go to Step 7.










STEP 7. Check the harness wires between ETACS-ECU connector C-114 and battery.

NOTE: After checking junction block connector C-104 and intermediate connector C-89, check the wires. If junction block connector C-104 and intermediate connector C-89 are damaged, repair or replace them. Refer to Harness Connector Inspection.

If the harness wires between ETACS-ECU connector C-114 and battery are damaged, repair them.
The turn-signal lights should flash normally.

STEP 8. Check the input signal.
Check the input signals from the following switches.
- Ignition switch (IG1)
- Turn-signal light 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 one of the input signal checks shows a defect, check the relevant input circuit.
If no defect appears, replace the ETACS-ECU. The turn-signal lights should flash normally.
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