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Inspection Procedure K-1

Flasher Timer: Turn-signal lights does not flash when the turn-signal light switch is turned on.

Turn-signal Light Power Supply Circuit Part 1:




Turn-signal Light Power Supply Circuit Part 2:






NOTE: This troubleshooting procedure requires the use of scan tool MB991958 and SWS monitor kit MB991813. For details on how to use the SWS monitor, refer to "How to use SWS monitor." 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
- The column switch (turn-signal light and lighting switch) may be defective
- The ETACS-ECU may be defective
- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector

DIAGNOSIS

Required Special Tools:
- MB991223: Harness Set
- MB991958: Scan Tool (MUT-III Sub Assembly)
- MB991824: Vehicle Communication Interface (V.C.I.)
- MB991827: MUT-III USB Cable
- MB991910: MUT-III Main Harness A
- MB991813: SWS monitor kit
- MB991806: SWS Monitor Cartridge
- MB991812: SWS Monitor Harness (For Column-ECU)
- MB991822: Probe Harness
- MB991854: SWS Monitor Harness (For 13-pin)

STEP 1. Verify the hazard warning light operation.

Q: Does the hazard warning light work normally?

YES: Go to Step 7.

NO: Go to Step 2.

STEP 2. Verify the turn-signal light operation.

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-217, junction block connectors C-202, C-205 and C-209 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Are ETACS-ECU connector C-217, junction block connectors C-202, C-205 and C-209 in good condition?

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

NO: Repair or replace the damaged component(s). Refer to Harness Connector Inspection. Verify that the turn-signal lights illuminate normally.




STEP 4. Check ETACS-ECU connector C-217 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is ETACS-ECU connector C-217 in good condition?

YES: Go to Step 5.

NO: Repair or replace the damaged component(s). Refer to Harness Connector Inspection. Verify that the turn-signal lights illuminate normally.

STEP 5. Check the battery power supply circuit to the ETACS-ECU. Measure the voltage at ETACS-ECU connector C-217.




1. Disconnect ETACS-ECU connector C-217 and measure the voltage available at the junction block side of the connector.




2. Measure the voltage between terminal 11 and ground.
- The voltage should equal approximately 12 volts (battery positive voltage).

Q: Is the measured voltage approximately 12 volts (battery positive voltage)?

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

NO: Go to Step 6.




STEP 6. Check the wiring harness between ETACS-ECU connector C-217 (terminal 11) and the battery.









NOTE: Also check intermediate connector C-116 and junction block connector C-202 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-116 or junction block connector C-202 is damaged, repair or replace the damaged component(s) as described in Harness Connector Inspection.

Q: Is the wiring harness between ETACS-ECU connector C-217 (terminal 11) and the battery in good condition?

YES: No action is necessary and testing is complete.

NO: The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary. Verify that the turn-signal lights illuminate normally.

STEP 7. Check the input signal by using "FUNCTION DIAG." menu of the SWS monitor.
Check the input signals from the switches in the following conditions:
- Turn the ignition switch to the "ON" position.
- Operate the turn-signal light switch to the "RH" position.

CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.




1. Connect scan tool MB991958 to the data link connector (16-pin).
2. Connect SWS monitor kit MB991813 to the data link connector (13-pin).
3. Operate the scan tool MB991958 according to the procedure below to display "TURN SIG.RH."
a. Select "SYSTEM SELECT."
b. Select "SWS."
c. Select "SWS MONITOR."
d. Select "FUNCTION DIAG."
e. Select "TURN SIGNAL."
f. Select "TURN SIG.RH."




4. 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" IGSW (IG1)"?

YES : Go to Step 8.

NO : Refer to Inspection Procedure N-6 "ETACS-ECU does not receive a signal from the turn-signal switch."

NO : Refer to Inspection Procedure N-2 "ETACS-ECU does not receive a signal from the ignition switch (IG1)."

STEP 8. Check the input signal by using "FUNCTION DIAG." menu of the SWS monitor.
If the Ignition switch is turned to the "ON" position and the turn-signal light switch (LH) is turned on, normal conditions should be displayed on the items described in the table.




1. Operate the scan tool MB991958 according to the procedure below to display "TURN SIG.LH."
a. Select "SYSTEM SELECT."
b. Select "SWS."
c. Select "SWS MONITOR."
d. Select "FUNCTION DIAG."
e. Select "TURN SIGNAL."
f. Select "TURN SIG.LH."




2. Check that normal conditions are displayed on the items described in the table.

Q: Do the scan tool display the items "T/S LH SW" is normal condition?

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

NO: Refer to Inspection Procedure N-6 "ETACS-ECU does not receive a signal from the turn-signal light switch."
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