#
KEY INTERLOCK SYSTEM DESCRIPTION

BME051809000T02

## Outline

• The key interlock system allows the ignition key to be removed only when the selector lever is in P position.

## Structure

• The key interlock system consists of the ignition switch, P position switch, key interlock resistor, steering lock, key interlock solenoid, and instrument cluster.

1 | Ignition switch
2 | LOCK
3 | ACC
4 | ON
5 | START
6 | P position switch
7 | Instrument cluster
8 | Tr1 (transistor 1)
9 | Tr2 (transistor 2)
10 | Key interlock resistor
11 | Key interlock solenoid

## Operation

### Positions other than P position (key interlock is operating)

  • When the selector lever is in a position other than P position with the ignition switch at ON or ACC position, Tr1 and Tr2 are turned on by the CPU in the instrument cluster and then the key interlock solenoid is energized. Because the slider moves toward the cylinder and the cam contacts the slider, the ignition key cannot be turned to LOCK position.
  • When the key interlock solenoid is turned on and approximately two seconds pass, Tr1 goes off and the key interlock solenoid is turned on only by Tr2.

1 | Ignition key cannot be turned to LOCK
2 | Cam
3 | Slider
4 | Key interlock solenoid

### P position (key interlock is not operating)

  • When the ignition switch is at LOCK position or selector lever is in P position, Tr1 and Tr2 are turned off by the CPU in the instrument cluster, and then the key interlock solenoid goes off. Because the slider is released from the cam by the return spring, the ignition key can be turned to LOCK position.

1 | Ignition key can be turned to LOCK
2 | Cam
3 | Slider
4 | Key interlock solenoid