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 harness connector M49 terminal 2 and ground.

2 Ground : Battery voltage.

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





Check continuity between key switch and ignition knob switch terminals 1 and 2.





OK or NG
OK - GO TO 3.
NG - Replace key cylinder assembly (built-in key switch).
3.CHECK KEY SWITCH SIGNAL CIRCUIT





1. Disconnect BCM connector.
2. Check continuity between BCM harness connector M18 (A) terminal 37 and key switch and ignition knob switch harness connector M49 (B) terminal 1.

37 - 1 : Continuity should exist.

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

37 - Ground : Continuity should not exist.

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.