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)

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Differential Lock Switch: Testing and Inspection

1. Loosen front caliper bleeder screw.
2. Turn ignition switch On, then ensure ABS warning lamp flashers and goes off.
3. Depress brake pedal several times. ABS warning lamp should be illuminated because the pressure differential switch is on.