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

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

Or, hide this message: temporarily or permanently

Shift Interlock: Testing and Inspection






1. With engine OFF, turn ignition switch to RUN position.
2. Place gear shift lever in PARK, brake not applied, and verify lever cannot be shifted from PARK.
3. With brake pedal applied, ensure gear shift lever can be shifted from PARK.
4. Shift to REVERSE, verify ignition switch cannot be turned to LOCK position.
5. Shift to PARK, verify ignition switch can be turned to LOCK position.