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DTC B1A25: Key ID unmatched
 
 
caution
  • When the DTC B1A25 is set, be sure to diagnose the CAN bus line.
  • When replacing the ECU, always check that the communication circuit is normal.
 
 
DTC SET CONDITION
KOS-ECU sets the DTC B1A25 when the received key ID is different from the one registered in it.
 
 
TECHNICAL DESCRIPTION (COMMENT)
KOS-ECU determines that the abnormality is present, if the key ID does not match the one registered in it when the power supply mode of the engine switch is turned ON.
 
 
TROUBLESHOOTING HINTS
  • Malfunction of the keyless operation key
  • Accessory key not registered
  • Accessory KOS-ECU not registered
  • Key is registered to another vehicle
  • Malfunction of KOS-ECU
 
 
DIAGNOSIS
STEP 1. Using scan tool MB991958, diagnose the CAN bus line.
(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 tool (M.U.T.-III) ."
(2) Turn the power supply mode of the engine switch to ON.
(3) Diagnose the CAN bus line.
(4) Turn the power supply mode of the engine switch to OFF.
Is the CAN bus line found to be normal?
Go to Step 2.
Repair the CAN bus line (Refer to GROUP 54C, Diagnosis ).
 
STEP 2. Register the key ID and recheck the diagnostic trouble code.
Register the key ID and keyless operation key ID of the keyless operation key by which the DTC is set (refer to ), and recheck if the DTC is set.
(1) Turn the power supply mode of the engine switch from OFF to ON.
(2) Check if the DTC is set.
Is the DTC set?
Go to Step 3.
The procedure is complete.
 
STEP 3. Replace the keyless operation key and recheck the diagnostic trouble code.
Replace the keyless operation key for which the DTC is set with the other key, and check whether the DTC is reset.
(1) Turn the power supply mode of the engine switch from OFF to ON.
(2) Check if the DTC is set.
Is the DTC set?
Go to Step 4.
Go to Step 5.
 
STEP 4. Register the key ID and recheck the diagnostic trouble code.
Register the key ID and keyless operation key ID of the keyless operation key by which the DTC is set (refer to ), and recheck if the DTC is set.
(1) Turn the power supply mode of the engine switch from OFF to ON.
(2) Check if the DTC is set.
Is the DTC set?
Go to Step 5.
The procedure is complete.
 
STEP 5. Replace the keyless operation key and recheck the diagnostic trouble code.
Replace the keyless operation key for which the DTC is set with a new one, register the key ID and keyless operation key ID (refer to ), and check whether the DTC is reset.
(1) Turn the power supply mode of the engine switch from OFF to ON.
(2) Check if the DTC is set.
Is the DTC set?
Replace KOS-ECU and register the ID codes (Refer to ).
The procedure is complete.