Operation CHARM: Car repair manuals for everyone.
Home >> Saab >> 2003 >> 9-3 (9440) L4-2.0L Turbo (2.0t) >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Information Bus >> Description and Operation >> Main Components
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)

Or, hide this message: temporarily or permanently

Main Components



Main Components

P-bus







1. Engine control module, ECM (589/595/705)
2. Control module, TCM (502)
3. Underhood Electrical Centre, UEC (342)
4. Control module, AHL (664)
5. Control module, ESP/TCS (671/382)
6. Angle Sensor, yaw, YRS (658)
7. Control panel, infotainment, ICM (736)
8. Column Integration Module, CIM (703a)

I-bus, 4D







1. Column Integration Module, CIM (703a)
2. Rear Electrical Centre, REC (701)
3. Control module, parking/auxiliary heater, PHM/AHM (597a)
4. Door control modules, DDM/PDM/RLDM/RRDM (702)
5. Control module, SPA (630)
6. Sun Roof Module, SRM (182b)
7. Main Instrument Unit, MIU (540)
8. Airbag Control Module, ACM (331)
9. Body Control Module, BCM (707)
10. Shift Lever Module, SLM (726)
11. Driver Seat Module, DSM (357Dk)
12. Underhood Electrical Centre, UEC (342)
13. Control module, ACC (216)
14. Tyre Pressure Monitoring Module, TPMM (753)
15. Control panel, infotainment, ICM (736)


O-bus, 4D







1. Control panel, infotainment, ICM (736)
2. Entertainment Head Unit, EHU (353)
3. CD player/changer, front, CDF/CDCF (355F)
4. CD Changer Rear, CDCR (355R)
5. Audio System Amplifier, front speakers, AMP1 (354F)
6. Audio System Amplifier, rear speakers, AMP2 (354R)
7. Communication unit, Positioning unit, CU/PU (468/635)
8. Unit, DVD (729)
pro multis · About Operation CHARM