Buick LaCrosse: Electrical System

Buick LaCrosse: Electrical System

• High Voltage Devices and Wiring
• Electrical System Overload
• Fuses and Circuit Breakers
• Engine Compartment Fuse Block
• Instrument Panel Fuse Block
• Rear Compartment Fuse Block

High Voltage Devices and Wiring

WARNING!
Exposure to high voltage can cause shock, burns, and even death. The high voltage components in the vehicle can only be serviced by technicians with special training.
High voltage components are identified by labels. Do not remove, open, take apart, or modify these components.
High voltage cable or wiring has orange covering. Do not probe, tamper with, cut, or modify high voltage cable or wiring.

Electrical System Overload

The vehicle has fuses and circuit breakers to protect against an electrical system overload.

When the current electrical load is too heavy, the circuit breaker opens and closes, protecting the circuit until the current load returns to normal or the problem is fixed. This greatly reduces the chance of circuit overload and fire caused by electrical problems.

Fuses and circuit breakers protect power devices in the vehicle.

Replace a bad fuse with a new one of the identical size and rating.

If there is a problem on the road and a fuse needs to be replaced, the same amperage fuse can be borrowed. Choose some feature of the vehicle that is not needed to use and replace it as soon as possible.

Headlamp Wiring

An electrical overload may cause the lamps to go on and off, or in some cases to remain off. Have the headlamp wiring checked right away if the lamps go on and off or remain off.

Windshield Wipers

If the wiper motor overheats due to heavy snow or ice, the windshield wipers will stop until the motor cools and will then restart.

Although the circuit is protected from electrical overload, overload due to heavy snow or ice may cause wiper linkage damage.

Always clear ice and heavy snow from the windshield before using the windshield wipers.

If the overload is caused by an electrical problem and not snow or ice, be sure to get it fixed.

Fuses and Circuit Breakers

The wiring circuits in the vehicle are protected from short circuits by a combination of fuses and circuit breakers. This greatly reduces the chance of damage caused by electrical problems.

To check a fuse, look at the silver-colored band inside the fuse.

If the band is broken or melted, replace the fuse. Be sure to replace a bad fuse with a new one of the identical size and rating.

Fuses of the same amperage can be temporarily borrowed from another fuse location, if a fuse goes out. Replace the fuse as soon as possible.

To identify and check fuses, circuit breakers, and relays, see Engine Compartment Fuse Block, Instrument Panel Fuse Block, and Rear Compartment Fuse Block.

Engine Compartment Fuse Block

To remove the fuse block cover, squeeze the three retaining clips on the cover and lift it straight up.

Notice:
Spilling liquid on any electrical component on the vehicle may damage it. Always keep the covers on any electrical component.

Engine Compartment Fuse Block

The vehicle may not be equipped with all of the fuses, relays, and features shown.

Instrument Panel Fuse Block

The instrument panel fuse block is located in the instrument panel, on the driver side of the vehicle. To access the fuses, open the fuse panel door by pulling down at the top.

Press in on the sides of the door to release it from the instrument panel.

Pull the door toward you to release it from the hinge.

Instrument Panel Fuse Block

The vehicle may not be equipped with all of the fuses, relays, and features shown.

Rear Compartment Fuse Block

The rear compartment fuse block is located on the left side of the trunk behind a cover. Vehicles with eAssist do not have a rear compartment fuse block.

The vehicle may not be equipped with all of the fuses, relays, and features shown.

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