MULTIPLEXING
Fault finding - Introduction
88B
88B-2
MONITORING MULTIPLEX NETWORK OPERATION
This step is the essential starting point before any computer diagnostics.
It ensures that the network is correctly connected at the terminals of each computer and that the signal is correctly
sent to it and received by it. On the Scénic II, this function also reads the number of faults present in the computers.
The
multiplex network test function is executed automatically after vehicle selection by the user.
After the network check, the other functions become accessible.
MULTIPLEX NETWORK TEST PROCEDURE:
⇒
Communication established with the computers storing the vehicle configuration (identification read).
⇒
Vehicle configuration read in the two computers that hold the multiplex network configuration (airbag and
UCH on the SCENIC II)
⇒ List of diagnosable computers read in the two configuration computers
⇒ Computer interrogation
⇒ Physical (electronic) measurements on the CAN network. Vehicle computer power supply for diagnostics:
Vehicle card in card reader.
Press and hold (over 5 seconds) the Start button in the absence of start conditions (for example: selecting a
gear).
Connect the diagnostic tool and perform the required operations.
Important: To power the discharge bulb computers, the dipped headlights must be turned on.
