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Renault SAFIR/SAFIR2/SFR200 and IAW 6R.20/6R.30: IMMO erase and disconnecting the immobiliser line

On these ECUs you can read the configuration data and erase the IMMO code; the car will run with the code erased provided the immobiliser line is disconnected from the ECU. This guide gives the exact immo line pins and the DB9 harnesses for bench work.

Procedure

1. Identify the ECU. Sagem SAFIR/SAFIR2 and Magneti Marelli SFR200: internal TMS374 MCU, 256 KB of configuration data; you can read the TMS374 configuration data and erase the IMMO code. Magneti Marelli IAW 6R.20/6R.30: TMS370 MCU, 256 bytes of configuration data inside the MCU.
2. Note which functions are available on the Magneti Marelli units: on the 6R.20 you can read and write the configuration data, on the 6R.30 you can read the configuration data and erase the IMMO code.
3. Find the immobiliser line to disconnect: SAFIR/SFR200 with the 35 pin connector, immo line on pin 30; with the 55 pin connector, immo line on pin 37. On IAW 6R.20/6R.30 the immobiliser line is pin 25.
4. DB9 Female wiring for SAFIR/SAFIR2/SFR200, 35 pin version (DB9 pin - ECU pin): 1-4.34, 2-18, 3-9, 4-20, 5-10.
5. DB9 Female wiring for SAFIR/SAFIR2/SFR200, 55 pin version (DB9 pin - ECU pin): 1-2.18, 2-1, 3-11, 4-48, 5-38.
6. DB9 Female wiring for IAW 6R.20/6R.30 (DB9 pin - ECU pin): 1-17.34, 2-35, 3-15, 4-23, 5-10.
7. Connect and power the ECU on the bench, read and save the configuration data as a backup, then erase the IMMO code.
8. Refit the ECU with the immobiliser line disconnected at the pin listed for your connector, then check starting and running.

Reference screenshots