DESCRIPTION The main body ECU (multiplex network body ECU) controls the daytime running lights. WIRING DIAGRAM  CAUTION / NOTICE / HINT NOTICE:
PROCEDURE
(a) Check the operation of the low beam headlights. OK: The low beam headlights operate normally.
(a) Connect the Techstream to the DLC3. (b) Turn the engine switch on (IG). (c) Turn the Techstream on. (d) Enter the following menus: Body Electrical / Main Body / Active Test. (e) Perform the Active Test according to the display on the Techstream. Body Electrical > Main Body > Active Test
OK: Daytime running lights illuminate.
(a) Inspect the DRL relay. Click here
(a) Measure the voltage according to the value(s) in the table below. Standard Voltage:
(a) Disconnect the A45 headlight assembly LH connector. (b) Disconnect the A44 headlight assembly RH connector. (c) Measure the resistance according to the value(s) in the table below. Standard Resistance:
(a) Disconnect the 4F instrument panel junction block assembly connector. (b) Measure the resistance according to the value(s) in the table below. Standard Resistance:
(a) Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly. Click here (b) Measure the resistance according to the value(s) in the table below. Standard Resistance:
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Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Can Communication System(for Hv Model): Open in One Side of Bus 1 Branch Line
DESCRIPTION When the CAN bus main lines are normal (no open, short to ground, short to +B or short between lines) and there is an ECU or sensor on the "Communication Bus Check" screen that is indicated as not communicating or whose connection status on the "Communication Bus Check" screen changes in ...
