Key Switch (BCM Input) Check

INTELLIGENT KEY SYSTEM


Key Switch (BCM Input) Check

1.CHECK KEY SWITCH POWER SUPPLY CIRCUIT





1. Remove mechanical key from ignition switch.
2. Disconnect key switch and ignition knob switch connector.
3. Check voltage between key switch and ignition knob switch and ground.






OK or NG
OK - GO TO 2
NG - Check harness between key switch and ignition knob switch and fuse.
2.CHECK KEY SWITCH OPERATION
Check continuity of key switch and ignition knob switch.










OK or NG
OK - GO TO 3
NG - Replace key cylinder assembly (built-in key switch).
3.CHECK KEY SWITCH CIRCUIT
1. Disconnect BCM connector.
2. Check continuity between BCM connector (A) M18 terminal 37 and key switch and ignition knob switch connector (B) terminal 1.










3. Check continuity between BCM connector (A) M18 terminal 37 and ground.






OK or NG
OK - Key switch (BCM input) circuit is OK.
NG - Repair or replace harness between key switch and ignition knob switch and BCM.