DESCRIPTION When the theft deterrent system is switched from the armed state to the alarm sounding state, the main body ECU (multiplex network body ECU) transmits a signal to cause the horn to sound at intervals of 0.4 seconds. WIRING DIAGRAM ![]() CAUTION / NOTICE / HINT NOTICE: Inspect the fuses for circuits related to this system before performing the following procedure. PROCEDURE
(a) Press the horn switch and check if the horns sound. Result
(a) Remove the driver side junction block assembly. Click here
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Toyota Tundra Service Manual > Sfi System: VC Output Circuit
DESCRIPTION The ECM constantly generates 5 V power from the battery voltage supplied to the +B (BATT) terminal to operate the microprocessor. The ECM also provides this power to the sensors through the VC output circuit. When the VC circuit has a short circuit, the microprocessor in the ECM and sens ...