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Home >> Fiat >> 2016 >> 500 Turbo, Standard Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 71 (Communication - Non-DTC Based Diagnostics - 500 - Electric) >> Diagnosis And Testing >> No Response From Orc (Occupant Restraint Controller) >> Theory Of Operation

Theory Of Operation

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The vehicle communications network includes a fault tolerant CAN-B bus of which the Occupant Restraint Controller (ORC) module is part of, and a non-fault tolerant CAN-C bus. The CAN-B bus is used for communication between body and interior modules at 50 kbps. The CAN-B-bus uses a star topology, with all the control modules connected to the BCM as the central hub.

Possible Causes
(Z921) GROUND CIRCUIT OPEN
(F721) FUSED IGNITION SWITCH OUTPUT (RUN/START) CIRCUIT OPEN OR SHORTED
(D41) AND (D42) CAN B BUS CIRCUITS OPEN
OCCUPANT RESTRAINT CONTROLLER MODULE
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