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IMMOBILIZER SYSTEM <Vehicles without keyless operation system> CHASSIS ELECTRICAL 54A-25 Code No.B1A24 Key ID not registered CAUTION • When the diagnosis code No. B1A24 is set, be sure to diagnose the CAN bus line. • When replacing the ECU, always check that the communication circuit is normal. DIAGNOSIS FUNCTION ETACS-ECU sets the diagnosis code No. B1A24 JUDGMENT CRITERIA ETACS-ECU determines that the abnormality is PROBABLE CAUSES • Malfunction of CAN bus line • Key ID not registered • Malfunction of ETACS-ECU DIAGNOSIS PROCEDURE STEP 1. M.U.T.-III CAN bus diagnostics Q: Is the check result normal? YES : Go to Step 2 NO : Repair the CAN bus line (Refer to GROUP − Troubleshooting ). STEP 2. Register the key ID and recheck the recheck if the diagnosis code is set. Remove the ignition key from the ignition switch, (2) Check if the diagnosis code is set. Q: Is the diagnosis code set? YES : Replace ETACS-ECU and register the ID codes (Refer to NO : The diagnosis is complete. Code No.B1A25 Key ID unmatched CAUTION • When the diagnosis code No. B1A25 is set, be sure to diagnose the CAN bus line. • When replacing the ECU, always check that the communication circuit is normal. DIAGNOSIS FUNCTION ETACS-ECU sets the diagnosis code No. B1A25 JUDGEMENT CRITERIA ETACS-ECU determines that the abnormality is PROBABLE CAUSES • Malfunction of CAN bus line • Malfunction of the ignition key • Malfunction of ETACS-ECU • Accessory key not registered • Key is registered to another vehicle DIAGNOSIS PROCEDURE STEP 1. M.U.T.-III CAN bus diagnostics Q: Is the check result normal? YES : Go to Step 2 NO : Repair the CAN bus line (Refer to GROUP − Troubleshooting ). STEP 2. Register the key ID and recheck the recheck if the diagnosis code is set. Remove the ignition key from the ignition switch, (2) Check if the diagnosis code is set. |