Inspection Procedure 1: The Tail Lamps do not Illuminate Normally.


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


COMMENTS ON TROUBLE SYMPTOM


If all the tail lamps do not illuminate, the tail lamp switch input circuit or the ETACS-ECU may be defective. Alternately, there may be the case that the adjustment function has set the tail lamps not be illuminated when the ignition switch is at the "LOCK" (OFF) 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 tail lamp switch.

  • Turn the tail lamp switch to the ON position.
Item No.
 Item name
 Normal condition
59
 Tail lamp output
 ON
OK: Normal condition is displayed.

Q. Is the check result normal?
Go to Step 3.
Refer to inspection procedure C-1 "The column switch (lighting and wiper switch) signal is not received ."

STEP 3. Connector check: C-218 ETACS-ECU connector


Q. Is the check result normal?

Go to Step 4.

Repair the defective connector.

STEP 4. Voltage measurement at C-218 ETACS-ECU connector.


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

(2)Voltage between C-218 ETACS-ECU connector terminal No.16 and body earth
OK: System voltage

Q. Is the check result normal?

Go to Step 6.

Go to Step 5.

STEP 5. Check the wiring harness between C-218 ETACS-ECU connector terminal No.16 and the fusible link (23).




note Prior to the wiring harness inspection, check the junction block connector C-207, and repair if necessary.

  • Check the power supply line from the fusible link (23) for open circuit.

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 ).

Repair the wiring harness.

STEP 6. Retest the system.
Check that the tail 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.