Inspection Procedure 11: None of the turn-signal lamps illuminate.


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


COMMENTS ON TROUBLE SYMPTOM


If none of the turn-signal lamps does not illuminate, the electric motor 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 electric motor switch is in the ACC position.

PROBABLE CAUSES



DIAGNOSIS PROCEDURE


STEP 1. M.U.T.-III diagnosis code.
When the electric motor 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 electric motor switch (IG1) and turn-signal lamp switch.

  • Turn the electric motor switch to the "LOCK" (OFF) position.
Item No.
 Item name
 Normal condition
30
 IG SW (IG1) /Power SW(ON)
 OFF

  • Turn the turn-signal lamp switch (LH) to the ON position.
Item No.
 Item name
 Normal condition
62
 Turn-signal lamp (LH) output
 ON
63
 Turn-signal lamp (RH) output
 OFF

  • Turn the turn-signal lamp switch (RH) to the ON position.
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 electric motor switch (IG1) signal is not received.> : Refer to inspection procedure 2 "The electric motor switch (IG1) signal is not received ."
NO <The turn-signal lamp switch signal is not received.> : Refer to inspection procedure 9 "The column 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 and register the ID codes (Refer to ).




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