Inspection Procedure 2: The Ignition Key Cannot Be Registered Using Scan Tool: Diagnosis
Required Special Tools:
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: Vehicle Communication Interface (V.C.I).
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A (Vehicles with CAN communication system)
- STEP 1. Check the ignition key inserted in the key cylinder for interference.
Q: Are there other ignition keys or anything that interferes with the communication (things that generate radio waves such as magnets and an air-cleaning device that has a power plug) near the ignition key inserted in the key cylinder?
YES : Move away or remove other ignition keys or things that interfere with the communication (things that generate radio waves such as magnets and a air-cleaning device that has a power plug) near the ignition key. Then, go to step 2.
NO : Go to Step 3.
- STEP 2. Retest the system
Check that the ignition key can be registered.
Q: Is the ignition key that cannot be registered using scan tool in good condition?
YES : The procedure is complete.
NO : Go to Step 3.
- STEP 3. Check which ignition key cannot be registered.
Q: Can any one of the ignition keys be registered?
YES (Only some keys) : Replace the key that cannot be registered and register the ID codes (refer to ID CODES REGISTRATION JUDGMENT TABLE . After registering the ID codes, go to Step 5.
NO (All keys) : Go to Step 4.
- STEP 4. Retest the system
Check the scan tool screen when the key was not able to be registered.
Q: Is the error message of scan tool screen "Abnormality in key"?
YES (Abnormality in key) : Carry out DTC B1A25: Transponder ID unmatched and DTC B1A35: Transponder read error. Refer to DTC B1A25: KEY ID UNMATCHED and DTC B1A35: TRANSPONDER READ ERROR . Then, go to Step 5.
NO (ECU internal error) : Replace WCM and register the ID codes (refer to ID CODES REGISTRATION JUDGMENT TABLE . After registering the ID codes, go to Step 5.
- STEP 5. Retest the system
Check that the ignition key can be registered.
Q: Is the ignition key cannot be registered using scan tool in good condition?
YES : The procedure is complete.
NO : Replace WCM and register the ID codes (refer to ID CODES REGISTRATION JUDGMENT TABLE ).