DESCRIPTION The main body ECU (multiplex network body ECU) controls the daytime running lights. WIRING DIAGRAM 
CAUTION / NOTICE / HINT NOTICE: Inspect the fuses for circuits related to this system before performing the following procedure. PROCEDURE
(a) Using the Techstream, perform the Active Test. Click here
OK: No. 1 daytime running relay (DRL) operates (daytime running lights turn on).
(a) Remove the No. 1 daytime running light relay (DRL) from the engine room relay block and junction block. (b) Inspect the No. 1 daytime running light relay (DRL). Click here
(b) Measure the voltage according to the value(s) in the table below. Standard Voltage:
(a) Remove the No. 1 daytime running light relay (DRL) from the engine room relay block and junction block. (b) Disconnect the 3H driver side junction block assembly connector. (c) for LED Headlight: (1) Disconnect the A59 headlight assembly LH connector. (2) Disconnect the A58 headlight assembly RH connector. (d) for Halogen Headlight: (1) Disconnect the A10 headlight assembly LH connector. (2) Disconnect the A11 headlight assembly RH connector. (e) Measure the resistance according to the value(s) in the table below. Standard Resistance: for LED Headlight
(b) Remove the main body ECU (multiplex network body ECU) from the driver side junction block assembly. Click here (c) Measure the resistance according to the value(s) in the table below. Standard Resistance:
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Toyota Tundra Service Manual > Dynamic Radar Cruise Control System: Cruise Main Indicator Light Circuit
DESCRIPTION When the dynamic radar cruise control system is turned on using the cruise control main switch (ON-OFF button), the cruise control indicator (vehicle-to-vehicle distance control mode) illuminates. The ECM uses this and other indicators to indicate the control condition (presence or absen ...
