Key Reminder Warning System: Precaution: Precaution

WARNING: This page is about a different car, the 2010 Toyota FJ Cruiser. However, it is still accessible from the selected car via links, so may be relevant.

DISCONNECT AND RECONNECT CABLE OF NEGATIVE BATTERY TERMINAL

NOTE:

When disconnecting the cable from the negative (-) battery terminal, initialize the following systems after the cable is reconnected.

System Name	See
METER / GAUGE SYSTEM	Refer to CALIBRATION

Before performing electronic work, disconnect the cable from the negative (-) battery terminal in order to prevent it from shorting and burning out.

Fig 1: Identifying Negative Battery Terminal & Cable
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Before disconnecting and reconnecting the battery cable, turn the ignition switch OFF and the headlight dimmer switch OFF. Then loosen the terminal nut completely. Do not damage the cable or terminal.
When the battery cable is disconnected, the clock and radio settings and stored DTCs are erased. Therefore, before disconnecting the battery cable, make a notes of them.