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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Pinpoint Test Notes




External Controls - Column Shift

Pinpoint Tests

Refer to Wiring Diagram Set 29, Transmission Controls - 4R75E for schematic and connector information. Diagrams By Number

Refer to Wiring Diagram Set 30, Transmission Controls - 6R80 for schematic and connector information. Diagrams By Number

Refer to Wiring Diagram Set 37, Shift Interlock for schematic and connector information. Diagrams By Number

Transmission Vehicle Harness - C1575









PCM - C175T









Brake Shift Interlock Actuator (BSIA) - C2008









Tow/Haul Switch - C2135