Inspection Procedure B-3: Turn-signal lamp operation sound function does not work normally.


caution Whenever the ECU is replaced, ensure that the input and output signal circuits are normal.

COMMENTS ON TROUBLE SYMPTOM
The ETACS-ECU operates this function in accordance with the input signals below.

  • Ignition switch (IG1)
  • Turn-signal lamp switch
  • Hazard warning lamp switch
If this function does not work normally, these input signal circuit(s) or the ETACS-ECU may be defective. Note that this function can be disabled/enabled by the customize function (default setting; disabled). In order to change the setting, the SWS monitor is required.

PROBABLE CAUSES

  • Malfunction of the column switch
  • Malfunction of the hazard warning lamp switch
  • Malfunction of the ETACS-ECU
  • Damaged harness wires and connectors

DIAGNOSTIC PROCEDURE

STEP 1. Check that the turn-signal lamps operate.
When the turn-signal lamp switch or the hazard warning lamp switch is operated, check that the turn-signal lamps flash.

Q. Is the check result normal?
Go to Step 2.
First, repair the turn-signal lamp(s) (Refer to ).

STEP 2. Customise function by using the SWS monitor
Use the SWS monitor customisation function to confirm that "Turn-signal buzzer" is set to "With function".

Q. Is the check result normal?
Go to Step 3.
Use the SWS monitor customisation function to set "Turn-signal buzzer" to "With function" (Refer to ).

STEP 3. ECU check by using the SWS monitor
Check that the power supply and earth lines to the ETACS-ECU and the column switch (column-ECU) and the SWS communication lines are normal.

  • Ignition switch: ON
ECUS TO BE CHECKED
  • ETACS ECU
  • Column ECU
OK: "OK" is displayed for all the items

Q. Are the check result normal?
Normal conditions are displayed for all the items. : Go to Step 4.
"NG" is displayed on the "ETACS ECU" menu. : Refer to GROUP 54C - Inspection Procedure 2 "Communication with the ETACS-ECU is not possible ."
"NG" is displayed on the "COLUMN ECU" menu. : Refer to GROUP 54C - Inspection Procedure 1 "Communication with the column switch (column-ECU) is not possible ."

STEP 4. SWS monitor data list
Check the SWS communication input signal, which are related to the turn-signal lamp operation sound function.
Selected item ETACS ECU
  • Hazard warning switch: ON
Item No.
 Item name
 Normal condition
Item 43
 BUZZER
 ON
OK: Normal condition is displayed.

Q. Is the check result normal?
Go to Step 5.
Replace the ETACS-ECU.

STEP 5. Retest the system.
Check that the turn-signal lamp operation sound function works normally.

Q. Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use troubleshooting/Inspection Service Points ).
Replace the ETACS-ECU.