MULTIPLEXING
Fault finding - Introduction
88B
88B-1
188BMULTIPLEXING
Fault finding - Introduction
INTRODUCTION
Description of the multiplex network:
The multiplex network consists of a twisted pair of wires connected to several vehicle computers. The two wires are
known as Can H and Can L.
Two of the computers have an internal resistance of 120 Ω (terminating resistance):
–the airbag computer
–the injection computer
The network carries data exchanged by the computers.
The Scénic II is a new-generation multiplex vehicle; the main change is the increase in communication speed to
500 kBauds.
On the Scénic II, only one multiplex network can be diagnosed with the RENAULT tool.
The maximum number of computers on this network is 15.
PURPOSE:
●The purpose of the multiplex network test is to determine the various computers present on the vehicle's multiplex
network as well as the cause of possible inter-computer communication failures.
●It also serves to determine the functions installed in the vehicle, which are sometimes housed in various
computers (distributed functions).
●The test also checks the condition of multiplex network segments.
●The multiplex network test can also run diagnostics on computers disconnected from the multiplex network; this
provides an overview of the vehicles electronic architecture. WARNING
Fault-finding on the Scénic II can only be done with the CLIP diagnostic tool fitted with the new vehicle
connection probe cord (part no. Elé 1674 or 00 00 167 400).
Note:
A second multiplex network for the navigation system may also be present.
