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INPUT SIGNAL PROCEDURES SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR 54B-529 Inspection Procedure Q-25: The vehicle speed signal is not received. CAUTION Whenever the ECU is replaced, ensure that the COMMENTS ON TROUBLE SYMPTOM The vehicle speed signal is used to operate the • Windshield wiper and washer (vehicle speed-dependent wiper function) • Seat belt warning buzzer function • Door ajar warning buzzer function • Seat belt indicator • Door ajar indicator POSSIBLE CAUSES • The CAN bus line is defective. • Malfunction of the vehicles speed sensor • Malfunction of the ETACS-ECU • Damaged harness wires and connectors DIAGNOSTIC PROCEDURE Step 1. MUT-III CAN bus diagnostics Q: Is the check result normal? YES : Go to Step 2. NO : Repair the CAN bus line (Refer to GROUP − Diagnosis Step 2. MUT-III diagnosis code Q: Is the diagnosis code set? YES : Diagnose the combination meter (Refer to GROUP 54A − Combination meter NO : Go to Step 3. Step 3. Pulse check OK: The MUT-III sounds or the voltmeter Q: Is the check result normal? YES : The trouble can be an intermittent malfunction (Refer to GROUP 00 − How to Cope with Intermittent Malfunction NO : Go to Step 4. Step 4. Retest the system. Q: Is the check result normal? YES : The trouble can be an intermittent malfunction (Refer to GROUP 00 − How to Cope with Intermittent Malfunction NO : Replace the ETACS-ECU. Speed Signal Input Circuit ETACS- SPEED SIGNAL COMBINATION CAN COMMUNICATION LINE CAN COMMUNICATION LINE INPUT SIGNAL System switch Check condition Vehicle speed When the vehicle speed has |