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STEP 2. Replace the battery in the keyless operation key (1) Erase the DTC. (2) Turn the ignition switch from the "LOCK" (OFF) position to (3) Check if the DTC is set. Q:Is the DTC set? YES: Go to Step 3. NO: The procedure is complete. (Discharged battery) STEP 3. Replace the keyless operation key and recheck the (1) Erase the DTC. (2) Turn the ignition switch from the "LOCK" (OFF) position to (3) Check if the DTC is set. Q:Is the diagnostic trouble code set? YES: Replace KOS-ECU and register the ID codes. (Refer NO: The procedure is complete. DTC B2401: Keyless/KOS key ID not registered M14209100015USA0000010000 ⦆ If the DTC B2401 is set, be sure to diagnose the ⦆ When replacing the ECU, always check that the DIAGNOSTIC FUNCTION JUDGEMENT CRITERIA when the number of the registered keyless operation PROBABLE CAUSES ⦆ The registration of a keyless operation key ID fails ⦆ Malfunction of the keyless operation key ⦆ Malfunction of KOS-ECU DIAGNOSIS Required Special Tools: ⦆ MB991958: Scan Tool (M.U.T.-III Sub Assembly) ⦆ MB991824: Vehicles Communication Interface (V.C.I.) ⦆ MB991827: M.U.T.-III USB Cable KEYLESS OPERATION SYSTEM (KOS) 42B-43 DIAGNOSIS |