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Helping A Friend With A Sc300


peter.

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Hi guys i personally donot own a lexus but i try to help people around me with their cars and to be honest with you guys most of my experience is with older american cars and offroading. Anyways my friend had his battery go out on him and it basically stranded him and in the process he installed his battery leads the wrong way (pos lead to negative and vica versa) . I know its a really dumb thing to do, but now we need a solution.

The first thing we did was replace the ecu with an exact repalcement, and checked fuses. The headlights and radio work but the car refuses to even crank.

What can be wrong ?

thanks

pete

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