DESCRIPTION The main body ECU (multiplex network body ECU) receives headlight dimmer switch information signals and illuminates the high beam headlights. 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: Headlight dimmer relay (DIMMER) operates (high beam headlights turn on).
(a) Remove the headlight dimmer relay (DIMMER) from the engine room relay block and junction block. (b) Inspect the headlight dimmer relay (DIMMER). Click here
(b) Measure the voltage according to the value(s) in the table below. Standard Voltage:
(a) Remove the headlight dimmer relay (DIMMER) from the engine room relay block and junction block. (b) Disconnect the J165 main body ECU (multiplex network body ECU) connector. (c) for Halogen Headlight: (1) Disconnect the A8 headlight assembly LH connector. (2) Disconnect the A9 headlight assembly RH connector. (d) for LED Headlight: (1) Disconnect the A59 headlight assembly LH connector. (2) Disconnect the A58 headlight assembly RH connector. (e) Measure the resistance according to the value(s) in the table below. Standard Resistance: for Halogen Headlight
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Toyota Tundra Service Manual > Navigation System: Parking Brake Switch Circuit
DESCRIPTION This circuit includes the parking brake switch assembly and navigation receiver assembly. WIRING DIAGRAM PROCEDURE 1. CHECK VEHICLE SIGNAL (OPERATION CHECK) (a) Display the "Vehicle Signal Check Mode" screen (See page ). (b) Check that the display changes between ON and OFF according to ...