These batteries (indicated by arrows) power the service life reminder warning light panel (SI).
Rechargeable SI panel nickel-cadmium batteries power computer memory during power outages (e.g. when turning on the ignition) or in the absence of voltage (with a discharged or disconnected battery). This ensures that the computer is constantly powered so that it continues to count the kilometers traveled and turn on the warning lights in time.
The battery life is approximately 6 years, after which they should be replaced with new ones. In addition, since they are recharged from the engine system, they may fail earlier for any reason (for example, a blown fuse, damaged wiring, or leaving the vehicle for too long). Excessive heat or cold can also shorten battery life, especially heat. Extremely high temperatures can even cause batteries to shatter and leak acid onto instrument panel components.
Some devices controlled by the SI panel may be affected by dead or dead batteries. Signs that the panel batteries are low or dead include erratic tachometer or temperature gauge readings, background noise in the radio, and an inability to turn off the panel warning lights with a special tool.
While only the complete SI panel assembly can be purchased from the manufacturer, batteries are sold separately elsewhere. Since batteries can be replaced by a home mechanic, they are soldered to the panel so that in case you are not competent in this and do not have the necessary tools, this work is left to an experienced electronics technician. Significant cost savings can be achieved if you remove the instrument panel (see Section Removal and installation of instrument panel components) and take it to an electronics specialist.
The instrument panel and its components are very susceptible to static electricity. Make sure you are grounded and free of static electricity (touch a metal water pipe) before touching the components of the instrument panel.