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. Pulse check

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

System switch	Check conditions
Ignition switch (IG1)	When turned from ACC to ON
Turn-signal lamp switch (RH)	When the turn-signal lamp switch (RH) is turned from off to on
Turn-signal lamp switch (LH)	When the turn-signal lamp switch (LH) is turned from off to on
Hazard warning lamp switch	When the hazard warning lamp switch is turned from off to on

OK: The MUT-II/III sounds or the voltmeter needle fluctuates.

Q: Are the check result normal?

All the signals are received normally.: Go to Step 3

.
The ignition switch (IG1) signal is not received.: Refer to inspection procedure P-2 "The ignition switch (IG1) signal is not received"

.
The turn-signal lamp switch (RH) signal is not received.: Refer to inspection procedure P-5 "The column switch (lighting and turn-signal lamp switch) signal is not received"

.
The turn-signal lamp switch (LH) signal is not received.: Refer to inspection procedure P-5 "The column switch (lighting and turn-signal lamp switch) signal is not received"

.
The hazard warning lamp switch signal is not received.: Refer to inspection procedure P-12 "The hazard warning lamp switch signal is not received"

Step 2. Check the SWS monitor customized function.

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

CAUTION

The SWS monitor must be used in order to confirm and change that setting. Use the SWS monitor to confirm and/or change the customized function.

Q: Is the check result normal?

YES: Go to Step 3

.
NO: Use the SWS monitor customize function to set "T/SIG.BUZZER" to "W.FUNCTION" (Refer to GROUP 54C - Adjustment function

Step 3. 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.