Key Switch Signal Circuit (Without Intelligent Key)

KEY SWITCH SIGNAL CIRCUIT (WITHOUT INTELLIGENT KEY)

Description

Transmits a key switch signal to the BCM.


Component Function Check


1. CHECK BCM INPUT SIGNAL

Select "DATA MONITOR" for "BCM" and check the "KEY ON SW" monitor value.
KEY ON SW

When key is inserted into key cylinder: ON
When key is removed from key cylinder: OFF
Is the inspection result normal?
YES- Inspection End.
NO- Refer to "Diagnosis Procedure" .


Diagnosis Procedure

Regarding Wiring Diagram information, refer to "Wiring Diagram" [1][2]Audible Warning Device.

1. CHECK FUSE

Check if the key switch 10A fuse [No. 8, located in the fuse block (J/B)] is blown.
Is the fuse blown?
YES- Replace the fuse after repairing the affected circuit.
NO- GO TO 2

2. CHECK BCM INPUT SIGNAL

Check voltage between BCM harness connector M18 terminal 37 and ground.





Is the inspection result normal?
YES- Inspection End.
NO- GO TO 3

3. CHECK KEY SWITCH CIRCUIT

1.Disconnect BCM connector M18 and key switch.
2.Check continuity between BCM harness connector M18 terminal 37 and key switch harness connector
M27 terminal 1.





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





Is the inspection result normal?
YES- GO TO 4
NO- Repair or replace harness.

4. CHECK KEY SWITCH POWER SUPPLY CIRCUIT

Check voltage between key switch harness connector M27 terminal 2 and ground.





Is the inspection result normal?
YES- Replace key switch.
NO- Repair or replace harness.


Component Inspection


1. CHECK KEY SWITCH

1.Turn ignition switch OFF.
2.Disconnect key switch.
3.Check continuity between key switch terminals 1 and 2.
1 -2

When key is inserted : Continuity should exist.
into key cylinder
When key is removed : Continuity should not exist.
from key cylinder
Is the inspection result normal?
YES- Inspection End.
NO- Replace key switch.