Volvo S40 2004-2009, V50 2004-2009, C30 CEM repair and synchronization with SID803 motor ECU utility.
How immobilizer works on Volvo S40 2004-2009, V50 2004-2009, C30:
Immobiliser data (immo) on these cars are stored in the Central electric module (CEM) located in the driver compartment fuse box. CEM receives transponder key signal from immobilizer coil and if key data is equal to the car, send synchronization signal to motor ECU. If transponder key is stored in CEM and synchronization data CEM-ECU is correct, CEM permit to start the engine. Motor ECU also is synchronized with ABS computer ID. For SID803 ECU replace you must also read ABS ID (you can read ABS ID with Launch X431, Diagun or other tools by OBDII) and write it to SID803.
How to use this program:
The most common problem on these cars is lost synchronization CEM-ECU after battery discharge. In motor ECU fault code “No communication with immobilizer” is active and the car not start. Remove CEM and read with CarProg A10 adapter processor EEPROM – see picture for details. Also, remove SID803 and read 95320 EEPROM. Open both files and write synchro data from CEM to SID803. Also, write the ABS serial ID. Save SID803 modified file and write it to SID803.
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