Circuit Description

When the ignition switch is turned to the ACC position, battery positive voltage is applied to terminal No. I19-21 (ACC) of the body ECU and when the ignition switch is turned to the ON position, battery positive voltage is applied to terminal No. I21-2 (SIG) of the body ECU. See Fig 1.

Fig 1: Identifying Ignition Switch Power Source Circuit

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002