DESCRIPTION This DTC is stored if the transponder key ECU assembly does not detect that the unlock warning switch assembly is on even when the ignition switch is ON.
WIRING DIAGRAM ![]() CAUTION / NOTICE / HINT NOTICE:
PROCEDURE
(a) Clear the DTCs. Click here
(a) Check for DTCs. Click here HINT: Before checking for DTCs, perform the "DTC Output Confirmation Operation" procedure. OK: DTC B2780 is not output.
(a) Remove the unlock warning switch assembly. Click here (b) Inspect the unlock warning switch assembly. Click here
(a) Disconnect the J18 unlock warning switch assembly connector. (b) Disconnect the J26 transponder key ECU assembly connector. (c) Measure the resistance according to the value(s) in the table below. Standard Resistance:
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Toyota Tundra Service Manual > Vehicle Stability Control System: Open in Stop Light Switch Circuit (C1425)
DESCRIPTION The skid control ECU (brake actuator assembly) receives stop light switch assembly signals and uses them to determine whether or not the brakes are applied. The skid control ECU (brake actuator assembly) has a detection circuit that it uses to detect an open in the stop light input line. ...