Electronic Key Battery. Checking and Replacing Fuses

The electronic key battery in the Lexus GS (4th generation) is easy to replace yourself. This section describes the procedure step by step, from removal to correctly installing the new battery. Important notes on handling and disposal ensure environmentally responsible use. Tips on avoiding mistakes are also provided, such as protecting the contacts and choosing the right battery. This keeps the Lexus GS key system fully functional.

Electronic Key Battery

Replace the battery when it is depleted.

You will need the following items:

• Flat-blade screwdriver
• Small flat-blade screwdriver
• CR2032 lithium battery

Replacing the battery

1. Remove the mechanical key.

2. Remove the cover.

To avoid damaging the key, wrap the tip of the screwdriver with a cloth.

3. Remove the battery cover.

To avoid damaging the key, wrap the tip of the screwdriver with a cloth.

4. Remove the depleted battery.

Install the new battery with the positive terminal (+) facing up.

■ Use a CR2032 lithium battery

• Batteries are available from any Lexus dealer or authorized service center, or another qualified repair shop with suitable equipment, as well as from electronics stores or camera shops.
• Replace the battery only with the battery recommended by the manufacturer or an equivalent battery.
• Dispose of used batteries in accordance with applicable laws.

■ When the card key battery (if equipped) needs to be replaced

Batteries for the smart key are available only from Lexus dealers. Your Lexus dealer can replace the battery for you.

■ If the Electronic Key Battery Is Depleted

The following symptoms may occur:

• The smart access and start system and the remote control do not function properly.
• The operating range decreases.

WARNING

■ Removed Battery and Other Parts

These are small parts that can cause choking if swallowed by small children. Keep these parts away from children. Failure to do so may result in death or serious injury.

■ Precautions When Handling the Lithium Battery

WARNING

RISK OF EXPLOSION IF THE WRONG BATTERY TYPE IS USED.

DISPOSE OF USED BATTERIES ACCORDING TO THE INSTRUCTIONS.

NOTICE

■ Ensuring Proper Operation After Replacing the Battery

Observe the following precautions to avoid accidents:

• Always work with dry hands. Moisture may cause the battery to corrode.
• Do not touch or move any other components inside the remote control.
• Do not bend the battery terminals.

Checking and Replacing Fuses

If electrical components do not work, a fuse may have blown. In this case, check the fuses and replace them if necessary.

1. 1
   Turn the engine switch off.
2. 2
   Open the fuse box cover.

Engine Compartment: Fuse Box Type A (Left-Hand Drive Vehicles)

Press the tab in and remove the cover.

Engine Compartment: Fuse Box Type A (Right-Hand Drive Vehicles)

Press the tab in and remove the cover.

Engine Compartment (Fuse Box Type B)

Press the tab in and remove the cover.

Left-Hand Side of Instrument Panel (Left-Hand Drive Vehicles)

Remove the cover.

Left-Hand Side of Instrument Panel (Right-Hand Drive Vehicles)

Remove the cover.

Right-Hand Side of Instrument Panel (Left-Hand Drive Vehicles)

Remove the cover.

Right-Hand Side of Instrument Panel (Right-Hand Drive Vehicles)

Remove the cover.

Tailgate

Press the tab in and remove the cover.

Remove the cover.

1. 1
   Remove the fuse using the fuse puller.

   Only Type A fuses can be removed with the fuse puller.

   

2. 2
   Check whether the fuse has blown.

1 Fuse OK 2 Fuse blown

Types A and B: Replace a blown fuse with a new fuse of the same amperage. The amperage is indicated on the fuse box cover.

Types C and D: Contact a Lexus dealer or authorized repair shop, or another qualified repair shop with the necessary equipment.

Type A

Type B

Type C

Type D

■ After Replacing a Fuse

• If the lights still do not work after replacing the fuse, a light bulb may need to be replaced.
• If the new fuse also blows, have the vehicle inspected by a Lexus dealer or authorized repair shop, or another qualified repair shop with the necessary equipment.

■ If a Circuit Is Overloaded

The fuses are designed to blow before the wiring harness is damaged.

■ When Replacing Light Bulbs

Lexus recommends using genuine Lexus replacement parts specified for this vehicle.

Some light bulbs are connected to overload protection circuits, so parts from other manufacturers or parts not intended for this vehicle may not be usable.

WARNING

■ Preventing System Malfunctions and Vehicle Fire

Observe the following precautions.

Failure to do so may result in damage to the vehicle and possibly a fire or injury.

• Never use a fuse with a higher amperage, and never substitute any other object.
• Use only genuine Lexus fuses or fuses of equivalent quality.

Never replace a fuse with wire, even as a temporary measure.

Do not modify fuses or fuse boxes.

NOTICE

■ Before Replacing Fuses

Have the cause of the electrical overload located and repaired as soon as possible by a Lexus dealer or authorized repair shop, or another qualified repair shop with the necessary equipment.

Replacing the electronic key battery in the Lexus GS GRL1 (4th generation) is simple thanks to clear instructions and a well-considered design. Using a high-quality CR2032 battery ensures reliable operation of the smart access and start system.

Fuse maintenance in the Lexus GS 2016–2020 is also designed for ease of use, which minimizes maintenance effort and increases reliability. This keeps the sport sedan a technical benchmark in its class.