Toyota Corolla (E170): Headlight switch

The headlights can be operated manually or automatically.

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Circuit description
When the ignition switch is turned on, battery positive voltage is applied to the coilwhich closes the contacts of the efi main relay (marked: efi) and supplies power to terminal +b of the ecm. This signal causes current to flow to the coil, closing the contacts of the efi relay and supplyin ...

Toyota Safety Sense 3.0
The Toyota Safety Sense 3.0 consists of the driving assist systems and contributes to a safe and comfortable driving experience: WARNING ■Toyota Safety Sense 3.0 The Toyota Safety Sense 3.0 operates under the assumption that the driver will drive safely, and is designed to help reduce the impact t ...

Inspection procedure
Hand–held tester: 1 Perform active test by hand–held tester(operation of circuit opening relay) Connect the hand–held tester to the dlc3.  turn the ignition switch on and push the hand–held tester main switch on.  select the item ”diagnosis / enhanced obd ii / active ...