Reset the circuit inertia safety switch Fiat Marea

Reset the circuit inertia safety switch Fiat Marea. Manufactured in 1996 until 2007.

Foreword. The vehicle is fitted with an inertia switch located inside the cabin to increase the safety of occupants during collisions. This sensor reduces the possibility of fire (due to emerging fuel) by cutting off the earth connection of the engine cut-out solenoid relay excitation circuit on the fuel pump.

Reset the circuit inertia safety switch Fiat Marea

Principle of operation. A steel ball fitted inside a tapered housing is normally held in locked position through the attractive force of an adjacent magnet. In the case of specific acceleration loads, the ball is released from the magnetic attraction and gradually emerges from the tapered mount, following an upward movement according to cone angle. A quick-release mechanism above the ball makes up a normally closed (N.C.) electrical circuit. When the mechanism is struck by the ball, it changes position from an N.C. circuit to a normally open circuit (N.A.) and thus breaks the earth connection of the relay supplying the engine stall solenoid on the injection pump.

Reset service circuit Fiat Marea

In the case of a violent collision, the ball breaks loose from the magnetic attraction and opens the normally closed electrical circuit (N.C). This in turn breaks the earth connection of the excitation circuit of the relay  supplying the engine cut-out solenoid. To reset the circuit earth connection, push back the seat and press the switch until it clicks on.

  1. Inertia switch
  2. Junction unit
  3. Engine cut out solenoid on injection pump
  4. FIAT CODE control unit
  5. Relay
  6. Battery
  7. Cut-out solenoid fuse
  8. Master fuse (IGN)
  9. Ignition switch

C= Common terminal
N.C. Normally closed
N.A. Normally open

After even an apparently light collision, if a smell of petrol is noted or fuel leaks are seen, do not activate the switch again until the fault has been found and corrected in order to avoid the risk of fire. If no leaks are noted and the vehicle is able to start, press the button to re-activate the earth connection to the exitation circuit of the relay supplying the engine cut- out solenoid on the injection pump.

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