Inspection Procedure 8: The TCL/ASC system cannot be disabled when ASC OFF switch is pressed for 3 seconds or more to turn the system OFF.

caution

If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ).
Whenever ECU is replaced, ensure that the CAN bus lines are normal.

OPERATION

EV-ECU terminal No. 17 is earthed by pressing ASC OFF switch. The ON/OFF state of ASC OFF switch is transferred from EV-ECU to ASC-ECU via CAN bus line.
When the ASC OFF switch is pressed for 3 seconds or more, the TCL/ASC system turns OFF.
When the ASC OFF switch is pressed and held for 15 seconds or more, ASC turns "ON".

COMMENTS ON TROUBLE SYMPTOM

This may be caused by the open circuit or short circuit in the ASC OFF switch circuit.

PROBABLE CAUSES

Damaged wiring harness and connectors
ASC OFF switch malfunction
Malfunction of EV-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics

Use M.U.T.-III to diagnose the CAN bus lines.

Q. Is the check result normal?

	Go to Step 2.

	Repair the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ). Then go to Step 8.

STEP 2. M.U.T.-III diagnosis code

Use M.U.T.-III to check the diagnosis code for the TCL/ASC system (Refer to

).

Q. Is the diagnosis code set?

	Carry out the diagnosis for the diagnosis code chart (Refer to ).

	Go to Step 3.

STEP 3. ASC OFF switch check

Refer to

.

Q. Is the check result normal?

	Go to Step 4.

	Replace ASC OFF switch (Refer to ). Then go to Step 8.

STEP 4. Connector check: C-106 EV-ECU connector, B-117 ASC OFF switch connector

Q. Is the check result normal?

	Go to Step 5.

	Repair the damaged connector.

STEP 5. Wiring harness check between C-106 EV-ECU connector terminal No. 17 and B-117 ASC OFF switch connector terminal No. 1

Check the signal circuit for short circuit.

Q. Is the check result normal?

	Go to Step 6.

	Repair the wiring harness between C-106 EV-ECU connector terminal No. 17 and B-117 ASC OFF switch connector terminal No. 1.

STEP 6. Wiring harness check between B-117 ASC OFF switch connector terminal No. 2 and the body earth

Check the earth wires for open circuit.

Q. Is the check result normal?

	Go to Step 7.

	Repair the wiring harness between B-117 ASC OFF switch connector terminal No. 2 and the body earth.

STEP 7. Retest the system.

Q. Does TCL/ASC system turn ON and OFF normally using ASC OFF switch?

	Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/How to Cope with Intermittent Malfunctions .)

	Replace the EV-ECU (Refer to GROUP 54D EV-ECU ). Then go to Step 8.

STEP 8. Retest the system.

Q. Does TCL/ASC system turn ON and OFF normally using ASC OFF switch?

	This diagnosis is complete.

	Return to Step 1.