Headlight Beam Level Control ECU Communication Circuit: Wiring Diagram
WARNING: This page is about a different car, the 2006 Lexus RX 400h. However, it is still accessible from the selected car via links, so may be relevant.
- CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL J/B - HEADLIGHT BEAM LEVEL CONTROL ECU)
- Disconnect the 1D connector of instrument panel junction block assembly and the H17 connector of headlight beam level control ECU.
- Measure the resistance according to the value(s) in the table below.
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Resistance
TESTER CONNECTION - SPECIFIED CONDITION (RESISTANCE)Tester connection Condition Specified condition 1D-3 - H17-7 Always Below 1 Ω
NG : REPAIR OR REPLACE HARNESS OR CONNECTOR
OK : GO TO NEXT STEP
- CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - HEADLIGHT BEAM LEVEL CONTROL ECU)
- Disconnect the connectors from the skid control ECU and the headlight beam level control ECU.
- Measure the resistance according to the value(s) in the table below.
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Resistance
TESTER CONNECTION - SPECIFIED CONDITION (RESISTANCE)Tester connection Condition Specified condition S40-33 (RRO) - H17-6 (SPDR) Always Below 1 Ω S39-25 (RLO) - H17-5 (SPDL) Always Below 1 Ω
NG : REPAIR OR REPLACE HARNESS OR CONNECTOR
OK : PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE