Inspection Procedure 10: After ASC OFF switch is Turned OFF, TCL/ASC System cannot be Disabled.














OPERATION
The ETACS-ECU terminal No. 15 is earthed by pressing the ASC OFF switch. The ON/OFF state of the ASC OFF switch is transferred from ETACS-ECU to ASC-ECU via the CAN bus line.

COMMENTS ON TROUBLE SYMPTOM
This may be caused by the open circuit in the ASC OFF switch circuit.

PROBABLE CAUSES

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

DIAGNOSIS PROCEDURE

STEP 1. Voltage measurement at C-313 ETACS-ECU connector

  • Measure the voltage between the terminal No. 15 and the body earth.
OK: Approximately 5 V

Q. Is the check result normal?
Go to Step 4.
Go to Step 2.

STEP 2. Connector check: C-313 ETACS-ECU connector, C-36 intermediate connector, C-102 ASC OFF switch connector

Q. Is the check result normal?
Go to Step 3.
Repair the defective connector.

STEP 3. ASC OFF switch check
Refer to .

Q. Does the check result vary?
Repair the wiring harness between the C-313 ETACS-ECU connector terminal No. 15 and the earth.
Go to Step 4.

STEP 4. Retest the system.

Q. Does ASC turn ON and OFF normally using the ASC OFF switch?
Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
Replace the ETACS-ECU, and then go to Step 5.

STEP 5. Retest the system.

Q. Does ASC turn ON and OFF normally using the ASC OFF switch?
This diagnosis is complete.
Return to Step 1.