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 > Window Defogger System: Parts Location
PARTS LOCATION ILLUSTRATION *A for Automatic Air Conditioning System *B for Manual Air Conditioning System *1 BACK WINDOW GLASS *2 ENGINE ROOM RELAY BLOCK, JUNCTION BLOCK - DEFOGGER RELAY (DEF) - DEFOG FUSE - NOISE FILTER *3 DRIVER SIDE JUNCTION BLOCK ASSEMBLY - ECU-IG1 NO. 3 FUSE *4 DLC3 *5 AIR CON ...
