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Inspection Procedure 2: The keyless operation key cannot be registered using scan tool.
 
 
cautionWhen replacing the ECU, always check that the communication circuit is normal.
 
 
 
 
TECHNICAL DESCRIPTION (COMMENT)
If only some keyless operation keys cannot be registered, the keyless operation key itself may be faulty. If no keyless operation key can be registered, the key assembly may have already been registered for another vehicle, or the KOS-ECU may be faulty.
 
 
TROUBLESHOOTING HINTS
  • Insufficient insertion of keyless operation key into key slot
  • CAN communication error with OSS-ECU
  • OSS-ECU key code not registered
  • Malfunction of the keyless operation key
  • Malfunction of KOS-ECU
  • Keyless operation key already registered to another vehicle
 
 
DIAGNOSIS
STEP 1. Sufficiently insert the keyless operation key into the key slot, and then check the trouble symptom.
Insert the keyless operation key into the key slot again, and check whether the keyless operation key can be registered.
Is the check result normal?
The procedure is complete.
Go to Step 2
 
STEP 2. Interference check of keyless operation key when it is inserted in the key slot
Check if there is another keyless operation key nearby or anything that interferes with the communication (magnets or objects that generate radio waves such as air-cleaning devices with a power plug).
Are there other keys or anything that interferes with the communication?
Move away or remove other keyless operation keys or anything that interferes with the communication. Then, go to Step 3.
Go to Step 4
 
STEP 3. Retest the system
Check that the keyless operation key can be registered.
Is the keyless operation key that cannot be registered using scan tool?
Go to Step 4.
The procedure is complete.
 
STEP 4. Using scan tool MB991958, read the diagnostic trouble code.
Check the DTC is set to the KOS-ECU.
(1)
cautionTo prevent damage to scan tool MB991958, always turn the power supply mode of the engine switch to the OFF position before connecting or disconnecting scan tool MB991958.
Connect scan tool MB991958. Refer to "How to connect scan too (M.U.T.-III) ."
(2) Turn the power supply mode of the engine switch to ON.
(3) Check if DTC is set.
(4) Turn the power supply mode of the engine switch to OFF.
Is the DTC is set?
Refer to diagnostic trouble code chart .
Go to Step 5.
 
STEP 5. Using scan tool MB991958, read the other system diagnostic trouble code.
Check the DTC is set to the OSS-ECU.
(1)
cautionTo prevent damage to scan tool MB991958, always turn the power supply mode of the engine switch to the OFF position before connecting or disconnecting scan tool MB991958.
Connect scan tool MB991958. Refer to "How to connect scan too (M.U.T.-III) ."
(2) Turn the power supply mode of the engine switch to ON.
(3) Check if DTC is set.
(4) Turn the power supply mode of the engine switch to OFF.
Is the DTC is set?
Refer to diagnostic trouble code chart .
Go to Step 6.
 
STEP 6. Check which keyless operation key cannot be registered.
Can any one of the keyless operation keys be registered?
(Only some keys) : Replace the key that cannot be registered and register the ID codes (Refer to ). After registering the ID codes, go to Step 8.
(All keys) : Go to Step 7.
 
STEP 7. Retest the system
Check the scan tool screen MB991958 when the key was not able to be registered.
Is the error message of scan tool screen "Abnormality in key" ?
(Abnormality in key) : Carry out DTC B1A25: Key ID unmatched (Refer to ).
(ECU internal error) : Replace KOS-ECU and register the ID codes (Refer to ).
 
STEP 8. Retest the system
Check that the keyless operation key can be registered.
Is the keyless operation key that cannot be registered using scan tool?
Replace KOS-ECU and register the ID codes (Refer to ).
The procedure is complete.