B2554

INTELLIGENT KEY SYSTEM/ENGINE START FUNCTION


B2554 ACC POWER CIRCUIT


DIAGNOSIS DESCRIPTION
B2554 ACC power supply circuit monitors the following 2 signals.
- Though the power supply switching control to ACC position by push-button ignition switch operation is performed normally, if there is no ACC power supply input to the Intelligent Key unit, it judges that it is the malfunction and displays the DTC (Diagnostic Trouble Code)
- When performing the power supply switching control to ACC position by push-button ignition switch operation, if the power supply position switching cannot be performed because the wake-up signal is not entered into PDU (Power Distribution Unit), it judges that it is the malfunction and displays the DTC (Diagnostic Trouble Code)

TERMINALS AND REFERENCE VALUE FOR INTELLIGENT KEY UNIT






CONSULT-III DATA MONITOR STANDARD VALUE






SELF-DIAGNOSTIC LOGIC






DIAGNOSTIC PROCEDURE
1.CHECK POWER SUPPLY CIRCUIT 1
With CONSULT-III
Check ("IGN ACC SW") in DATA MONITOR mode with CONSULT-III.

When ignition switch is turned to ACC
ACC ON SW : ON

Without CONSULT-III





Check voltage between Intelligent Key unit connector and ground.





OK or NG
OK - ACC power circuit is OK. Check the self-diagnosis results using CONSULT-III again.
NG - GO TO 2.
2.CHECK COMMUNICATION CIRCUIT
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 - GO TO 3.
NG - Repair or replace harness.
3.CHECK POWER SUPPLY CIRCUIT 2
1. Connect Intelligent Key unit and power distribution unit connector.
2. Check voltage 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 - Check the following.
- 10A fuse [No.6, located in the fuse block (J/B)]
- Harness for open or short between fuse and Intelligent Key unit.