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 > Airbag System: Front Airbag Sensor Lost Communication (LH) (B1617,B1618)
DESCRIPTION The front airbag sensor LH circuit consists of the airbag sensor assembly and front airbag sensor LH. The front airbag sensor LH detects impacts to the vehicle and sends signals to the airbag sensor assembly to determine if the airbag should be deployed. DTC B1617 or B1618 is stored when ...
