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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Century Testing Procedures








Page 8A-89-0,1 - Wiring Diagram





Page 8A-89-2 - Component Location, Troubleshooting and Symptom Table





Page 8A-89-3 - Chart 1 and Figure 1





Page 8A-89-4 - Chart 2





Page 8A-89-5 - Chart 3











Page 8A-89-6 - Chart 4





Page 8A-89-9 - Chart 5





Page 8A-89-10 - Figure 2 J37608 - Adapter and Connection to Run Turn Signal Switch





Page 8A-89-11 - Figure 3 J37608 - Tool Adapter and Connection to Tech 1





Page 8A-89-12 - Figure 4 J37608 - Tool and Connection to Allow the Tech 1 to Simulate the Steering Wheel Control Keypad and Electronic Module





Page 8A-89-13 - Figure 5 - Installation of J37608 Tool





Page 8A-89-14 - Circuit Operation