Inspection Procedure J-1

Flasher Timer: Turn-signal Lights does not Flash when the Turn-signal Light Switch is Turned On

Turn-Signal Light Power Supply Circuit:

Connector:

NOTE: This troubleshooting requires use of scan tool MB991502 and SWS monitor kit MB991862. For details of how to use the SWS monitor, refer to "How to use SWS monitor".

CIRCUIT OPERATION
- The turn-signal light switch sends a signal through the column-ECU (incorporated in the column switch) to the ETACS-ECU. If the column-ECU sends a turn-signal light switch "ON" signal to the ETACS-ECU, the ETACS-ECU turns on the flasher timer (incorporated in the ETACS-ECU), thus causing the turn-signal lights to flash.
- The ETACS-ECU operates the turn-signal lights according to the following signals:
- Ignition switch (IG1)
- Turn-signal light switch

TECHNICAL DESCRIPTION (COMMENT)
Is the turn-signal lights do not flash normally, the input circuits from the switches described in "CIRCUIT OPERATION" or the ETACS-ECU may be defective. If the hazard warning lights do not flash, the power supply line to the ETACS-ECU (dedicated to the turn-signal lights) may be defective.

TROUBLESHOOTING HINTS
- Malfunction of 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)
- MB991862: SWS monitor kit

STEP 1. Check the hazard warning light.

Q: Does the hazard warning light work normally?

YES: Go to Step 7.

NO: Go to Step 2.

STEP 2. Check the turn-signal lights.

Q: Does either of the turn-signal lights illuminate?

YES (illuminates at only one side): Go to Step 3.

NO (do not illuminate at all): Go to Step 4.







STEP 3. Check ETACS-ECU connector C-226, junction block connectors C-210, C-214 and C-217 for damage.

Q: Are ETACS-ECU connector C-226, junction block connectors C-210, C-214 and C-217 in good condition?

YES: Replace the ETACS-ECU. Check that the turn-signal lights illuminate normally.

NO: Repair or replace the connector. Refer to Harness Connector Inspection. Check : that the turn-signal lights illuminate normally.




STEP 4. Check at ETACS-ECU connector C-226 in order to check the power supply circuit to the ETACS-ECU (battery power supply).

1. Disconnect ETACS-ECU connector C-226, and measure at the junction block side.
2. Measure the voltage between terminal 11 and ground.
- The measured value should be approximately 12 volts (battery positive voltage).

Q: Does the measured voltage correspond with this range?

YES: Replace the ETACS-ECU. Check that the turn-signal lights illuminate normally.

NO: Go to Step 5.




STEP 5. Check ETACS-ECU connector C-226 for damage.

Q: Is ETACS-ECU connector C-226 in good condition?

YES: Go to Step 6.

NO: Repair or replace the connector. Refer to Harness Connector Inspection. Check that the turn-signal lights illuminate normally.










STEP 6. Check the wiring harness between ETACS-ECU connector C-226 and the battery.

NOTE: Also check intermediate connector C-129 and junction block connector C-210. If intermediate connector C-129 or junction block connector C-210 is damaged, repair or replace the connector as described in Harness Connector Inspection.

Q: Is the wiring harness between ETACS-ECU connector C-226 and the battery in good condition?

YES: No action to be taken.

NO: Repair the wiring harness. Check that the turn-signal lights illuminate normally.

STEP 7. Check the input signal by using service data of the SWS monitor.
Check the input signals from the following switches:
- ignition switch: ON
- turn-signal light switch: RH

CAUTION: To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502. Also connect SWS monitor kit MB991862 after turning on scan tool MB991502.







1. Connect scan tool MB991502 to the data link connector.
2. Connect SWS monitor kit MB991862 to the column switch connector.




3. Select "TURN SIGNAL - TURN-SIG RH" (FUNCTION DIAG), and check that normal conditions are displayed on the items described in the table.

Q: Are normal conditions displayed on the "T/S RH SW" and "IG SW(IG1)"?

YES: Replace the ETACS-ECU. Check that the turn-signal lights illuminate normally.

NO:
- Normal condition is not displayed on the "T/S RH SW": Refer to Inspection Procedure L-5 "ETACS- ECU does not receive a signal from the turn-signal RH switch."
- Normal condition is not displayed on the "IG SW (IG1)": Refer to Inspection Procedure L-2 "ETACS-ECU does not receive a signal from the ignition switch (IG1)."