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 > Occupant Classification System: Passenger Side Buckle Switch Circuit Malfunction (B1771)
DESCRIPTION The passenger side buckle switch circuit consists of the occupant classification ECU and the front seat inner belt RH. DTC B1771 is recorded when a malfunction is detected in the passenger side buckle switch circuit. Troubleshoot DTC B1771 first when DTCs B1771 and B1795 are output simul ...
