Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

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Shift Interlock: Testing and Inspection

TROUBLESHOOTING HINTS:
1. The shift lever should lock in Park with the Ignition Switch in the Run position and the brake pedal in the at rest position. If the shift lever can be moved from the Park position, with the Ignition Switch in the Run position and without depressing the brake pedal, check turn signal operation. If the turn signals do not operate correctly, check TURN B/U Fuse 16 to see if it is open (the turn signal flasher is on the same circuit as BTSI). If the fuse is open, find and repair source of overload, then replace fuse. If the fuse is good (turn signals operate correctly), continue with diagnostics.
2. With the Ignition Switch in the OFF position, the shift lever should be able to be moved from the Park position without applying the brake. If not, the problem may be with the Steering Column Shift Lever Actuator or the shift linkage itself. If the shift linkage does not appear to be binding, continue with BTSI Diagnostics.
3. If the Park/Neutral Position And Backup Lamp Switch needs adjustment or replacement.
4. To Remove, disconnect, or adjust the Steering Column Shift Lever Actuator, refer to Steering and Suspension.




Transmission Selector Lever Is Locked In Park With Key On And Brake Pedal Depressed




Transmission Is Locked In Park With Key In Off Position




Shift Lever Will Not Lock In Park Position