System Diagram

WARNING: This page is about a different car, the 2008 Lexus IS F. However, it is still accessible from the selected car via links, so may be relevant.

WIPER AND WASHER SYSTEM

Various switches or sensors are shown as being inputs for the different systems mentioned in the article. Where direct electrical connections do not exist between components, signals may be carried across the different networks (BEAN, CAN) that exist on the vehicle. If a signal needs to travel from a CAN system to a BEAN system, or between different BEAN networks, the gateway ECU allows the signal to travel between these different networks. Some of these different signals can be confirmed or inspected using the Techstream

The following system diagrams are intended to show the concept of operation, and may not precisely reflect the construction of the system on the vehicle

Fig 1: Wiper And Washer System Diagram (1 Of 2)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 2: Wiper And Washer System Diagram (2 Of 2)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Input and Output Signals of Each ECU

ECU INPUT AND OUTPUT SIGNALS REFERENCE CHART

Transmitting ECU (Transmitter)	Receiving ECU	Signal	Communication
Rain Sensor	Main Body ECU LH (Cowl Side Junction Block LH)	HI continuous operation command signal LO continuous operation command signal LO single operation command signal Manual intermittent operation command signal	BEAN
Combination Switch ECU	Main Body ECU LH (Cowl Side Junction Block LH)	Wiper switch INT signal Wiper switch LO signal Wiper switch HI signal Wiper switch AUTO position signal Washer switch signal Wiper switch MIST signal Wiper adjusting volume signal	BEAN
Combination Switch ECU	Front Controller	Washer motor operation signal	BEAN
Combination Meter	Main Body ECU LH (Cowl Side Junction Block LH)	Vehicle speed signal	BEAN
Combination Meter	Rain Sensor	Vehicle speed signal	BEAN
Combination Switch ECU	Rain Sensor	Wiper & washer switch signal	BEAN
ECM	Main Body ECU LH (Cowl Side Junction Block LH)	Shift position P signal Shift position N signal Stop light ON command signal	CAN - BEAN
Main Body ECU RH (Cowl Side Junction Block RH)	Main Body ECU LH (Cowl Side Junction Block LH)	Parking brake switch signal	BEAN
Main Body ECU RH (Cowl Side Junction Block RH)	Combination Switch ECU	Engine switch signal	BEAN
Main Body ECU RH (Cowl Side Junction Block RH)	Rain Sensor	Display dimmer signal	BEAN
Main Body ECU LH (Cowl Side Junction Block LH)	Rain Sensor	Wiper motor position signal Wiper blade position signal	BEAN
Power Source Control ECU	Rain Sensor	Key code identification signal	BEAN
Front Controller	Combination Meter	Washer level signal	BEAN

HINT

Wiper operation is controlled by the main body ECU LH (cowl side junction block LH)
The rain sensor controls the auto wiper function