Inspection Procedure 7: 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.

PROBABLE CAUSES



DIAGNOSIS PROCEDURE


STEP 1. ECU check by using the SWS monitor.


Check that the power supply and earth lines to the ETACS-ECU and the SWS communication lines are normal.

ECU TO BE CHECKED
OK: "OK" is displayed on the "ETACS ECU" menu.

Q. Is the check result normal?

Go to Step 2.

Refer to GROUP 54C - Trouble Symptom Chart .

STEP 2. Check that the hazard warning lamps operate.


Check that the hazard warning lamps illuminate normally.

Q. Is the check result normal?

Go to Step 6.

Go to Step 3.

STEP 3. Connector check: D-419 ETACS-ECU connector.


Q. Is the check result normal?

Go to Step 4.

Repair the defective connector.

STEP 4. Voltage measurement at the D-419 ETACS-ECU connector.


(1)Remove the ETACS-ECU, and measure at the junction block side.
(2)Voltage between D-419 ETACS-ECU connector terminal No.11 and body earth
OK: System voltage

Q. Is the check result normal?

Go to Step 8.

Go to Step 5.

STEP 5. Check the wiring harness between D-419 ETACS-ECU connector terminal No.11 and the battery.


note Prior to the wiring harness inspection, check intermediate connector D-241 and junction block connector D-401, and repair if necessary.

Q. Is the check result normal?

Go to Step 8.

Repair the wiring harness.

STEP 6. Function diagnosis by using the SWS monitor.


Check the SWS communication signal, which are related to the right turn-signal lamps.
<Selected item> TURN SIGNAL - TURN-SIG. RH
Item No.
 Item name
 Normal condition
Item 10
 TURN SIG.RH
 ON
Item 11
 TURN SIG.LH
 OFF
Item 30
 IG SW(IG1)
 ON
OK: Normal conditions are displayed for all the items

Q. Is the check result normal?

YES (Normal conditions are displayed for all the items) : Go to Step 7.

NO (Normal condition is not displayed for item 10 or 11) : Refer to ETACS - Input Signal Chart .

NO (Normal condition is not displayed for item No.30) : Refer to ETACS - Input Signal Chart .

STEP 7. SWS monitor data list.


Check the SWS communication signal, which are related to the left turn-signal lamps.
<Selected item> TURN SIGNAL - TURN-SIG. LH
Item No.
 Item name
 Normal condition
Item 10
 TURN SIG.RH
 OFF
Item 11
 TURN SIG.LH
 ON
OK: Normal conditions are displayed for all the items.

Q. Is the check result normal?

YES (Normal conditions are displayed for all the items) : Go to Step 8.

NO (Normal condition is not displayed for item 10 or 11) : Refer to ETACS - Input Signal Chart .

STEP 8. 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 Cope with Intermittent Malfunction ).

Replace the ETACS-ECU.