Therefore, every time you disconnect the terminals from the battery, to avoid unforeseen consequences it is necessary to remember the following:
- the engine control unit will lose stored information such as engine idle speed and various operating modes, as well as any detected fault codes. After disconnecting and reconnecting the battery terminals, the control unit will need some time to restore all lost parameters;
- on models with electric door locks, be sure to remove the key from the ignition and keep it with you so that you can open the vehicle if the battery is connected and the door locks are accidentally activated.
- use devices known as "memory savers." They can help avoid some of the problems mentioned above. Typically, this device, which is a small-capacity battery, is plugged into a power outlet instead of a cigarette lighter while disconnected from the battery. the "memory savers" provide power to the engine control unit to store information and fault codes stored in the unit's memory, and also ensure the operation of the clock and store the radio station frequencies stored in the radio receiver's memory. When using the memory saver, be aware that power is supplied to the vehicle's electrical equipment, so de-energize the relevant electrical circuit or component before performing any work.
- the vehicles are equipped with safety systems (SRS), including airbags and seat belt tensioners. Before working near the impact sensors, instrument panel, and steering column, disconnect the negative and then positive terminals from the battery and wait 2 minutes. This will prevent unauthorized deployment of the airbags and seat belt pretensioners, which could cause injury.