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DTC B1A25: Transponder ID unmatched
 
 
caution
  • When replacing the ECU, always check that the communication circuit is normal.
 
 
DIAGNOSTIC FUNCTION
KOS-ECU stores 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 electric motor switch is turned ON.
 
 
TROUBLESHOOTING HINTS
  • Malfunction of the keyless operation key
  • Malfunction of KOS-ECU
  • Key is registered to another vehicle
 
 
DIAGNOSIS
STEP 1. All of the registered keyless operation keys should allow the electric motor switch to be turned from OFF to ACC, ON, START.
(1) Prepare all of the registered keyless operation keys.
(2) Remove the batteries from all of the keyless operation keys (Refer to ).
(3) Insert one of the keyless operation keys into the key slot.
(4) Check whether the electric motor switch can be turned from LOCK (OFF) to ACC, ON, START.
(5) Turn the electric motor switch to OFF again.
(6) Repeat the same procedure for the other keyless operation keys.
(7) Install the batteries to all the keyless operation keys.
Is the check result normal?
: Check if the DTC is set. If the DTC is erased, the diagnosis complete. If not, go to Step 3.
: Check whether DTC B2352 is set. If DTC B2352 is set, go to the troubleshooting (Refer to ). Repeat Step 1. If DTC B2352 is not set, go to Step 2.
 
STEP 2. Register the keyless operation key(s) which cannot activate the electric motor switch again.
Register the keyless operation key(s) which cannot activate the electric motor switch again (Refer to ).
Is the check result normal?
: Go to Step 3.
: The keyless operation key(s), which cannot be registered, is defective. Put it aside. Go to Step 3.
 
STEP 3. Register all of the keyless operation keys again.
(1) Register all of the registered keyless operation keys again (Refer to ).
noteExclude the keyless operation key(s) which you put aside on Step 2.
(2) Remove the batteries from all of the keyless operation keys (Refer to ).
(3) Insert one of the keyless operation keys into the key slot.
(4) Check whether the electric motor switch can be turned from OFF to ACC, ON, START.
(5) Turn the electric motor switch to OFF again.
(6) Repeat the same procedure for the other keyless operation keys.
(7) Install the batteries to all the keyless operation keys.
Is the check result normal?
: Check if the DTC is set. If the DTC is erased, the diagnosis is complete. If not, go to Step 5.
: Go to Step 4.
 
STEP 4. Replace the keyless operation key(s) which cannot activate the electric motor switch with a new one.
(1) Replace the keyless operation key(s) which cannot activate the electric motor switch with a new one.
(2) Register a new keyless operation key (Refer to ).
(3) Check that all of the registered keyless operation keys allow the electric motor switch to be turned from OFF to ACC, ON, START.
(1) Remove the batteries from all of the keyless operation keys (Refer to ).
(2) Insert one of the keyless operation keys into the key slot.
(3) Check whether the electric motor switch can be turned from OFF to ACC, ON, START.
(4) Turn the electric motor switch to OFF again.
(5) Repeat the same procedure for the other keyless operation keys.
(6) Install the batteries to all the keyless operation keys.
Is the check result normal?
Go to Step 6.
Replace KOS-ECU and register the ID codes (Refer to ).
 
STEP 5. Replace the KOS-ECU, and then register all of the keyless operation keys again.
(1) Replace KOS-ECU and register the ID codes (Refer to ).
(2) Register all of the keyless operation keys again (Refer to ).
(3) Check that all of the registered keyless operation keys allow the electric motor switch to be turned from OFF to ACC, ON, START.
(1) Remove the batteries from all of the keyless operation keys (Refer to ).
(2) Insert one of the keyless operation keys into the key slot.
(3) Check whether the electric motor switch can be turned from LOCK (OFF) to ACC, ON, START.
(4) Turn the electric motor switch to OFF again.
(5) Repeat the same procedure for the other keyless operation keys.
(6) Install the batteries to all the keyless operation keys.
Is the check result normal?
Go to Step 6.
Replace KOS-ECU and register the ID codes (Refer to ).
 
STEP 6. Check whether the DTC is set again.
Check again if the DTC is set in the KOS-ECU.
(1) Erase the DTC.
(2) Turn the power supply mode of the electric motor switch from OFF to ON.
(3) Check if the DTC is set.
(4) Turn the power supply mode of the electric motor switch to OFF.
Is the DTC set?
Replace KOS-ECU and register the ID codes (Refer to ).
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).