INSPECTION PROCEDURE M-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

DIAGNOSTIC PROCEDURE

Step 1. 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 2.

Step 2. Connector check: C-219 ETACS-ECU connector.


Q. Is the check result normal?

Go to Step 3.

Repair the defective connector.

Step 3. 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 5.

Go to Step 4.

Step 4. Check the wiring harness between C-219 ETACS-ECU connector terminal No.11 and 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?

The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).

Repair the wiring harness.

Step 5. 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.

Step 6. Pulse check
Check the input signals below, which are related to the turn-signal lamp illumination.
System switch
 Check condition
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
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 7.
The turn-signal lamp switch (RH) signal is not received. : Refer to inspection procedure P-6 "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-6 "The column switch (lighting and turn-signal lamp switch) signal is not received ."

Step 7. 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.