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I have just checked the service manual, b1071 forward impact sensor id code incorrect. B1074 forward impact sensor open circuit.
Aß you have changed the impact sensor three times you either have a faulty control unit or a high resistance to the sensor.
You need to check the wiring from control unit to sensor. Disconnect the battery and control unit and sensor Impact sensor pin numbers 50 &51 are the correct pins for the impact sensor. Check the wiring with a ohm meter. The pin numbers are on the control unit multi plug.
On most airbag systems there is a contact bar bridging across the terminals so you will have to wedge the bat open.
Please be very careful when using a multi meter on a airbag system. If you prob the wrong wires you can set a airbag off.
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