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 > Audio And Visual System: Operation Check
OPERATION CHECK 1. CHECK PANEL & STEERING SWITCH HINT: The radio and display receiver assembly panel switches are checked in the following procedure. Illustrations may differ from the actual vehicle screen depending on the device settings and options. Therefore, some detailed areas may not be ex ...
