Inspection Procedure 2: The keyless operation key cannot be registered using the M.U.T.-III.

COMMENTS ON TROUBLE SYMPTOM

PROBABLE CAUSES

• Insufficient inverse insertion of keyless operation key at the emergency operation
  
• Malfunction of the keyless operation key
  
• Damaged wiring harness and connectors
  
• Malfunction of receiver antenna module
  
• Malfunction of KOS-ECU
  
• Ignition key registered for other vehicle
  

DIAGNOSIS PROCEDURE

STEP 1. Sufficiently insert the keyless operation key in the inverted direction at the emergency operation, and check the trouble symptom.

Q. Is the check result normal?

STEP 2. Check the interference of the inversely-inserted keyless operation key at the emergency operation

Q. Are there other keys or anything that interferes with the communication (things that generate radio waves such as magnets or air-cleaning devices with a power plug) near the inversely-inserted keyless operation key?

STEP 3. Retest the system

Q. Is the keyless operation key that cannot be registered using the M.U.T.-III?

STEP 4. Check which keyless operation key cannot be registered.

Q. Can any one of the keyless operation keys be registered?

STEP 5. Retest the system

Q. Is the error message of M.U.T.-III screen "Abnormality in key" ?

STEP 6. Retest the system

Q. Is the keyless operation key that cannot be registered using the M.U.T.-III?

STEP 7. Check receiver antenna module connector C-07 and KOS-ECU connector C-23 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q. Is the check result normal?

STEP 8. Check the wiring harness between the receiver antenna module connector C-07 (terminal Nos.1, 8, 12, 3, 5, 2, 4) and the KOS-ECU connector C-23 (terminal Nos.12, 32, 7, 9, 13, 11, 10).

• Check the all harness lines for open circuit and short circuit.
  

Q. Is the check result normal?

STEP 9. Replace the receiver antenna module, and retest the system.

Q. Is the keyless operation key that cannot be registered using M.U.T.-III?