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Transmission and transfer case » AW-4 automatic transmission » Description and operation
Brake transmission shift interlock mechanism

DESCRIPTION

The Brake Transmission Shifter/Ignition Interlock (BTSI), is a cable and solenoid operated system. It interconnects the automatic transmission floor mounted shifter to the steering column ignition switch (Fig. 37).

OPERATION

The system locks the shifter into the PARK position.

The Interlock system is engaged whenever the ignition switch is in the LOCK or ACCESSORY position.

An additional electrically activated feature will prevent shifting out of the PARK position unless the brake pedal is depressed at least one-half an inch. A magnetic holding device in line with the park/brake interlock cable is energized when the ignition is in the RUN position. When the key is in the RUN position and the brake pedal is depressed, the shifter is unlocked and will move into any position. The interlock system also prevents the ignition switch from being turned to the LOCK or ACCESSORY position (Fig. 38) unless the shifter is fully locked into the PARK position.


Fig. 37 Ignition Interlock Cable Routing

1 - SHIFT MECHANISM
2 - LOCK-TAB
3 - IGNITION LOCK INTERLOCK
4 - STEERING COLUMN
5 - SOLENOID
6 - WIRE CONNECTOR
7 - LEVER
8 - MOUNT BRACKET
9 - SHIFT CABLE
10 - AUTOMATIC TRANSMISSION
11 - TIE STRAP
12 - PARK/BRAKE INTERLOCK CABLE

Fig. 38 Ignition Key Cylinder Actuation
Fig. 38 Ignition Key Cylinder Actuation

1 - SLIDER LOCKED
2 - CAM RETURN SPRING
3 - INTERLOCK CABLE
4 - CAM
5 - SLIDER

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