Inspection Procedure 8: The Turn-signal Lamps do not Illuminate.


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


COMMENTS ON TROUBLE SYMPTOM


If all the turn-signal lamps do not illuminate, the ignition switch (IG1), the turn-signal lamp switch input circuit or the ETACS-ECU may be defective. Using a customisation function, the turn-signal lamps can be operated even when the ignition switch is in the ACC position.

PROBABLE CAUSES



DIAGNOSIS PROCEDURE


STEP 1. M.U.T.-III diagnosis code.


When the ignition switch is turned to the "LOCK" (OFF) position, check that the ETACS-ECU does not set the diagnosis code.

Q. Is the diagnosis code set?

Refer to diagnosis code chart .

Go to Step 2.

STEP 2. M.U.T.-III data list


Check the input signal from the ignition switch (IG1) and turn-signal lamp switch.

Item No.
 Item name
 Normal condition
30
 Ignition switch(IG1)
 OFF

Item No.
 Item name
 Normal condition
62
 Turn-signal lamp (LH) output
 ON
63
 Turn-signal lamp (RH) output
 OFF

Item No.
 Item name
 Normal condition
62
 Turn-signal lamp (LH) output
 OFF
63
 Turn-signal lamp (RH) output
 ON
OK: Normal conditions are displayed for all the items.

Q. Is the check result normal?

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

NO <The ignition switch (IG1) signal is not received.> : Refer to inspection procedure C-3 "The ignition switch (IG1) signal is not received ."

NO <The turn-signal lamp switch signal is not received.> : Refer to inspection procedure C-1 "The column switch (lighting and wiper switch) signal is not received ."

STEP 3. Retest the system.


Check that the turn-signal lamps illuminate 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 - How to Cope with Intermittent Malfunction ).

Replace the ETACS-ECU.