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

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 Trouble Symptom Chart ).

Step 2. 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 M.U.T.-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-11 "The hazard warning lamp switch signal is not received" .

Step 3. Customize function by using the SWS monitor
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?
Go to Step 4.
Use the SWS monitor customize function to set "T/SIG.BUZZER" to "W.FUNCTION" (Refer to GROUP 54E - Customize function ).

Step 4. 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 Cope with Intermittent Malfunction ).
Replace the ETACS-ECU.