Toyota Corolla (E170): Instrument panel light control

When the tail lights are on, the brightness of the instrument panel lights can be adjusted. (On vehicles with an automatic light control system, the instrument panel lights can be adjusted when the surrounding area is dark and the tail lights are on.) The brightness of the clock light can be adjusted regardless of whether the tail lights are on or off.

1 Brighter
2 Darker

Trip information

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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 ...

    Battery
    Check the battery as follows. ■ Battery exterior Make sure that the battery terminals are not corroded and that there are no loose connections, cracks, or loose clamps. 1 Terminals 2 Hold-down clamp ■Before recharging When recharging, the battery produces hydrogen gas which is ...

    Inspection procedure
    1 Inspect transmission wire(sl) Disconnect the transmission wire connector from the transaxle.  measure the resistance according to the value(s) in the table below. Standard: 2 Check harness and connector(transmission wire – ecm) Connect the transmission wire c ...