INSPECTION PROCEDURE L-1: 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.

POSSIBLE CAUSES

  • Malfunction of the column switch
  • Malfunction of the ETACS-ECU
  • Damaged harness wires and connectors

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.

  • Ignition switch: OFF
ECU TO BE CHECKED
  • ETACS ECU
OK: "OK" is displayed on the "ETACS ECU" menu.

Q. Is the check result normal?
Go to Step 2.
Refer to Inspection Procedure A-3 "Communication with the ETACS-ECU is not possible ."

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: C-219 ETACS-ECU connector.

Q. Is the check result normal?

Go to Step 4.

Repair the defective connector.

Step 4. Voltage measurement at the C-219 ETACS-ECU connector.

(1)Remove the ETACS-ECU, and measure at the junction block side.

(2)Voltage between C-219 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 C-219 ETACS-ECU connector terminal No.11 to the fusible link (26).



note Prior to the wiring harness inspection, check intermediate connector C-125 and junction block connector C-203, and repair if necessary.

  • Check the power supply line for open circuit.

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
  • Turn-signal lamp switch: RH
  • Ignition switch: ON
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?
Normal conditions are displayed for all the items. : Go to Step 7.
Normal condition is not displayed for item 10 or 11. : Refer to inspection procedure P-5 "Column switch (lighting and turn-signal lamp switch) signal is not received ."
Normal condition is not displayed for item No.30. : Refer to inspection procedure P-2 "The ignition switch (IG1) signal is not received ."

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
  • Turn-signal lamp switch: LH
  • Ignition switch: ON
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?
Normal conditions are displayed for all the items. : Go to Step 8.
Normal condition is not displayed for item 10 or 11. : Refer to inspection procedure P-5 "Column switch (lighting and turn-signal lamp switch) signal is not received ."

Step 8. Retest the system.
Check that the turn-signal lamps illuminate.

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.