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 Overview, Components Having A Bus Connection



System Overview, Components Having A Bus Connection

P-bus







1. Engine management system , ECM (589/595)
2. TCM (Transmission Control Module), control module for automatic gearbox (502)
3. ESP (Stabiliser system) (671)
4. Steering angle sensor, SAS (657)
5. MIU (Main Instrument Unit) (540)







1. MIU (Main Instrument Unit) (540)
2. TWICE (Theft Warning Integrated Central Electronics) (632)
3. ACC (Automatic Climate Control) (216)
4. Head unit, audio/navigation (IHU) (635)
5. CDC (CD changer) (355)
6. PSM (Power Seat Memory) (357Dk)
7. PMM (Power Mirror Memory), door mirror memory (611)
8. DICE (Dashboard Integrated Central Electronics) (628)
9. Airbag control module (ACM) (331)
10. SPA (Saab Parking Assistance) (630)
11. SID control module (541)







1. SID control module (541)
2. Audio system, head unit (EHU) (353)
3. Radio receiver, satellite radio (SDAR) (349)
4. Control module, OnStar (673)
5. Data link connector (445)