Lexus IS250 · Service Manual BODY ELECTRICAL

SYSTEM DIAGRAM

System information


WIPER AND WASHER SYSTEM

  1. Various switches or sensors are shown as being inputs for the different systems mentioned in the section. 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 the CAN network to the BEAN network, 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 intelligent tester.

  2. 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.

E119079E01
E119080E01
Input and output signals of each ECU: 
Transmitting ECU
(Transmitter)
 Receiving ECU
 Signals
 Communication
Rain Sensor
 Main Body ECU LH (Cowl Side J/B LH)
  1. HI continuous operation command signal
  2. LO continuous operation command signal
  3. LO single operation command signal
  4. Manual intermittent operation command signal
  5. Wipe angle variable demand signal
 BEAN
Combination Switch ECU
 Main Body ECU LH (Cowl Side J/B LH)
  1. Wiper switch INT signal
  2. Wiper switch LO signal
  3. Wiper switch HI signal
  4. Wiper switch AUTO position signal
  5. Washer switch signal
  6. Wiper switch MIST signal
  7. Wiper adjusting volume signal
 BEAN
Combination Switch ECU
 Front Light ECU
  1. Washer motor operation signal
 BEAN
Combination Meter ECU
 Main Body ECU LH (Cowl Side J/B LH)
  1. Vehicle speed signal
 BEAN
Combination Meter ECU
 Rain Sensor
  1. Vehicle speed signal
 BEAN
Combination Switch ECU
 Rain Sensor
  1. Wiper & washer switch signal
 BEAN
ECM
 Main Body ECU LH (Cowl Side J/B LH)
  1. Shift position P signal
  2. Shift position N signal
 CAN - BEAN
Main Body ECU RH (Cowl Side J/B RH)
 Main Body ECU LH (Cowl Side J/B LH)
  1. Parking brake switch signal
  2. Stop light ON command signal
 BEAN
Main Body ECU RH (Cowl Side J/B RH)
 Combination Switch ECU
  1. Engine switch signal
 BEAN
Main Body ECU RH (Cowl Side J/B RH)
 Rain Sensor
  1. Display dimmer signal
 BEAN
Main Body ECU LH (Cowl Side J/B LH)
 Rain Sensor
  1. Wiper motor position signal
  2. Wiper blade position signal
 BEAN
Steering Lock ECU
 Rain Sensor
  1. PUSH switch signal
 BEAN
Front Light ECU
 Combination Meter ECU
  1. Washer level signal
 BEAN

HINT:
  1. Wiper operation is controlled by the main body ECU LH (cowl side J/B LH).
  2. The rain sensor controls the auto wiper function.

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