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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Body Control Systems



Data Bus On Board Diagnostic Interface Multi-Pin Connector Assignments







20-pin connector, black

1. Battery + (terminal 30)
2. Battery + (terminal 30)
3. Reserved for external diagnosis
4. Reserved for K-lead
5. Comfort CAN bus Low
6. Powertrain CAN bus Low
7. Reserved for shielding
8. CAN Bus instrument cluster Low
9. Diagnostic CAN bus Low
10. CAN-Bus Infotainment Low
11. Ground (GND) (terminal 31)
12. Ground (GND) (terminal 31)
13. Instrument cluster prompt input
14. Terminal 15
15. Comfort CAN bus high
16. Power CAN bus high
17. Reserved for shielding
18. CAN Bus instrument cluster High
19. Diagnostic CAN bus High
20. CAN-Bus Infotainment High