DESCRIPTION When an open or short circuit is detected in the transponder key amplifier built into the transponder key ECU assembly, the transponder key ECU assembly stores this DTC.
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 B2784 is not output.
(a) Check that the connectors are properly connected to the transponder key coil.
(a) Clear the DTCs. Click here
(a) Check for DTCs. Click here HINT: Before checking for DTCs, perform "DTC Output Confirmation Operation" procedure. OK: DTC B2784 is not output.
(a) Using an oscilloscope, check the waveform. ![]()
OK: Waveform is similar to that shown in the illustration.
(a) Disconnect the J26 transponder key ECU assembly connector. (b) Disconnect the J168 transponder key coil connector. (c) Measure the resistance according to the value(s) in the table below. Standard Resistance:
(a) Replace the transponder key ECU assembly with a new one. Click here NOTICE: Key ID code registration is necessary when replacing the transponder key ECU assembly. Click here
(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 B2784 is not output.
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Toyota Tundra Service Manual > Audio And Visual System: AV Signal Stoppage (Low Battery Voltage) (B158F)
DESCRIPTION This DTC is stored when a video or audio signal is interrupted due to battery voltage input to the radio and display receiver assembly dropping temporarily. DTC Code DTC Detection Condition Trouble Area B158F A video or audio signal is interrupted when the battery voltage drops. Radio an ...