Yes, you can use a Lexus IS to jumpstart another car, but you must be extremely cautious and follow the correct procedure to avoid causing expensive damage to its sensitive electronics. Modern vehicles like the Lexus IS have complex computer systems that can be harmed by voltage spikes if the jumper cables are connected improperly.
The key is to connect to the jump-start terminal under the hood, not directly to the battery. In most Lexus IS models, the actual 12-volt battery is in the trunk, and the positive terminal under the hood is specifically designed for this purpose. This terminal connects directly to the battery through a fuse, providing a safer connection point.
Here is the correct step-by-step process:
- Position the Cars: Park the Lexus IS and the disabled car nose-to-nose or side-by-side, ensuring they are not touching. Turn both engines off and set the parking brakes.
- Identify Terminals: Open the hood of both cars. Locate the positive jump-start terminal in the Lexus (it’s usually a red cap with a "+" symbol in the engine bay). Find the negative grounding point (an unpainted metal bracket or bolt) in the disabled car's engine bay.
- Connect Cables in This Exact Order:
- Red Clamp (+) to the positive jump-start terminal on the Lexus.
- Other Red Clamp (+) to the positive terminal of the dead battery.
- Black Clamp (-) to the negative terminal of the good battery in the Lexus.
- Final Black Clamp (-) to the grounding point on the disabled car's engine block.
- Start the Cars: Start the engine of the Lexus IS and let it run for a few minutes. Then, attempt to start the disabled car.
- Disconnect Cables in Reverse Order: Once the disabled car is running, carefully disconnect the cables in the exact reverse order you connected them.
The primary risk is incorrect connection, which can fry the Engine Control Unit (ECU) or other modules, leading to repair bills that can run into thousands of dollars. If you are unsure, it is always safer to call for professional roadside assistance.
