INSPECTION PROCEDURE B-5: 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.

POSSIBLE CAUSES

Malfunction of the column switch

Malfunction of the hazard warning lamp switch

Malfunction of the ETACS-ECU

Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

Step 1. Check the SWS monitor customized function.

Use the SWS monitor customize function to confirm that "T/SIG.BUZZER" is set to "W.FUNCTION".

Q: Is the check result normal?

YES: Go to Step 2

.
NO: Use the SWS monitor customize function to set "T/SIG.BUZZER" to "W.FUNCTION" (Refer to

Step 2. ECU check on 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" are displayed for all the items

Q: Are the check result normal?

"OK" are displayed for all the items: Go to Step 3

.
"NG" is displayed on the "ETACS ECU" menu.: Refer to Inspection Procedure A-3 "Communication with the ETACS-ECU is not possible"

.
"NG" is displayed on the "COLUMN ECU" menu.: Refer to Inspection Procedure A-2 "Communication with the column switch (column-ECU) is not possible"

Step 3. Confirm communication data by using the SWS monitor.

Check the SWS communication input signal, which are related to the turn-signal lamp operation sound function.

<Selected item> ETACS

Ignition switch: ON

Driver's door: open

Item No.	Item name	Normal conditions
Item 30	IG SW( IG1)	ON
Item 43	BUZZER	ON

OK: Normal conditions are displayed for all the items.

Q: Are the check result normal?

Normal conditions are displayed for all the items.: Go to Step 4

.
Normal condition is not displayed for item No.30.: Refer to inspection procedure P-2 "The ignition switch (IG1) signal is not received"

.
Normal condition is not displayed for item No.43.: Replace the ETACS-ECU.

Step 4. Confirm communication data by using the SWS monitor.

Check the SWS communication input signal, which are related to the turn-signal lamp operation sound function.

<Selected item> COLUMN ECU

Turn-signal lamp switch (RH): ON (only when item No.10 is checked)

Turn-signal lamp switch (LH): ON (only when item No.11 is checked)

Item No.	Item name	Normal conditions
Item 10	TURN SIG. RH	ON
Item 11	TURN SIG. LH	ON

OK: Normal conditions are displayed for all the items.

Q: Are the check result normal?

Normal conditions are displayed for all the items.: Go to Step 5

.
Normal condition is not displayed for item No.10.: Refer to inspection procedure P-5 "The column switch (lighting and turn-signal lamp switch) signal is not received"

.
Normal condition is not displayed for item No.11.: Refer to inspection procedure P-5 "The column switch (lighting and turn-signal lamp switch) signal is not received"

Step 5. Check the ETACS SW data by using the SWS monitor.

Check the ETACS-ECU signal, which is related to the turn-signal lamp operation sound function.

Hazard warning lamp switch: ON

Item No.	Item name	Normal conditions
Item 04	HAZARD LMP SW	ON

OK: Normal condition is displayed.

Q: Is the check result normal?

YES: Go to Step 6

.
NO: Refer to inspection procedure P-12 "The hazard warning lamp switch signal is not received"

Step 6. Retest the system.

Check that the turn-signal lamp operation sound function works normally.

Q: Is the check result normal?

YES: The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction

).
NO: Replace the ETACS-ECU.