02
22-88
Multiplex Integrated Control System
System Description (cont’d)
Ignition Switch On
Wiper Switch On : Low
: On
Ign
: Low
Wiper
Ign
: On
Wiper : Low
Ign
: On
0
1
2
3
0
1
2
3 : High
: Low
: Intermittent
: Off
: Lock
: ACC
: On
: Start
III
II
I
0
III
II
I
0
Ignition
Switch
Windshield
Wiper/Washer
Switch
Wiper
Int
Relay
Relay Control
Module
Multiplex Integrated
Control Unit (MICU)
Combination Switch
Control Unit
Wiper
Motor
Messages are transmitted by an ECU (that monitors an input) over the communication circuit. ECUs that use the
message (information related to that input) are the receivers. For example, the combination switch control unit
monitors the wiper switch. When the wiper switch is placed in the low speed position, the combination switch control
unit transmits that message on the communication circuit. The relay control module receives the message and turns
on the wipers by providing a ground for the relay.