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 Service & Repair Manual > Front Door Courtesy Switch: Components
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