B2551

INTELLIGENT KEY SYSTEM/ENGINE START FUNCTION


B2551 STEERING LOCK UNIT


DIAGNOSIS DESCRIPTION
Though the communication between the Intelligent Key unit and the steering lock unit is normal, when the steering lock/unlock is not normal, B2551 steering lock unit malfunction judges that it is the malfunction and displays the DTC (Diagnostic Trouble Code)

TERMINALS AND REFERENCE VALUE

Intelligent Key Unit






PDU (Power Distribution Unit)






SELF-DIAGNOSTIC LOGIC






DIAGNOSTIC PROCEDURE
1.CHECK STEERING LOCK SIGNAL
Check voltage between power distribution unit connector and ground.










OK or NG
OK - GO TO 2.
NG - GO TO 4.
2.CHECK POWER DISTRIBUTION UNIT POWER SUPPLY
Check voltage between power distribution unit connector and ground.










OK or NG
OK - GO TO 3.
NG - Check if "B2558 PDU" is displayed on self-diagnosis results. If it is displayed, first perform the diagnosis.
3.CHECK POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect power distribution unit and steering lock unit connector.
3. Check continuity between power distribution unit connector and steering lock unit connector.










4. Check continuity between power distribution unit connector and ground.





OK or NG
OK - GO TO 5.
NG - Repair or replace harness.
4.CHECK COMMUNICATION CIRCUIT 1
1. Turn ignition switch OFF.
2. Disconnect Intelligent Key unit and power distribution unit connector.
3. Check continuity between Intelligent Key unit connector and power distribution unit connector.










4. Check continuity between Intelligent Key unit connector and ground.





OK or NG
OK - Check the condition of harness and connector.
NG - Repair or replace harness.
5.CHECK SIGNAL CIRCUIT
1. Connect steering lock unit and power distribution unit connector.
2. Check continuity between steering lock unit connector and ground.










OK or NG
OK - Replace steering lock unit.
NG - GO TO 6.
6.CHECK COMMUNICATION CIRCUIT 2
1. Turn ignition switch OFF.
2. Disconnect Intelligent Key unit and steering lock unit connector.
3. Check continuity between Intelligent Key unit connector and steering lock unit connector.










4. Check continuity between Intelligent Key unit connector and ground.





OK or NG
OK - Check the condition of harness and connector. If it is OK, check the self-diagnosis results using
CONSULT-III again.
NG - Repair or replace harness.