DIAGNOSIS SYSTEM CHECK DLC3 (a) Check the DLC3. Click here INSPECT BATTERY VOLTAGE (a) Measure the vehicle battery voltage. Standard voltage: 11 to 14 V If the voltage is below 11 V, recharge or replace the battery. SELF-DIAGNOSTIC MODE (a) Connect the Techstream to the DLC3. (b) Turn the ignition switch to ON. (c) Turn the Techstream on. (d) Enter the following menus: Body Electrical / Main Body / Utility / Wireless Door Lock Diagnosis Mode. (e) Proceed to the next step in accordance with the prompts on the Techstream screen. (f) Check that the system has switched to self-diagnostic mode by checking the interior light output pattern. 
(g) Check that the system has switched to self-diagnostic mode by checking the wireless door lock buzzer output pattern. 
(h) Check the diagnostic outputs when a door control transmitter assembly switch is pressed. The diagnostic outputs can be checked by the interior light and wireless door lock buzzer patterns.  Result
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Toyota Tundra Service Manual > Trailer Brake Control System: System Description
SYSTEM DESCRIPTION 1. FUNCTION DESCRIPTION *1 Trailer Brake Control Switch *2 GAIN (+/-) Selection Button *3 Manual Trailer Brake Output Slider *4 Steering Pad Switch Assembly (a) Steering Pad Switch Assembly: (1) The trailer brake type can be set by operating the steering pad switch assembly. (b) G ...
