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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System Relay: Testing and Inspection

Compressor Controls-Circuit Testing:




Compressor Controls-Circuit Testing:




1. Disconnect the A/C relay connector.
2. Check continuity between terminals.
3. If not as specified, replace the relay.
4. If correct, go to next step.
5. Apply 12V to terminal 5 and ground terminal 1.
6. Check for a continuity between terminals 2 and 3.
7. If not as specified, replace the relay.