Jump starting

[the baron]

Is it OK to use my IS250 to jump start another vehicle without damage to the car computer ?

[johnatg]

I'd disconnect your Battery first. Jump starting modern cars with complex electronics is risky (whether as donor or recipient). Most of the time you will be OK - but there's always a chance of damage to one or other!

[jackcramerr]

How will disconnecting Battery help?

Should the process for jump.start be, the donor is started and lightly revved. The recipient Battery is connected by high quality wires (not el cheapo 15 poundo CCA ones). Let the recipient Battery charge for 5-10 minutes. Then crank. If it doesnt crank and connections are ok leave it there. It is hopeless.

[johnatg]

Disconnecting your (donor) Battery isolates your car electronics from potential spikes from the other car, and effectively leaves the recipient car with (hopefully) a similar situation to that if it had a properly charged Battery. Nothing wrong with your sequence but it really applies to older cars and is dangerous for cars with modern electronics. But as I said, most of the time there will be no problem.