connecting the main car battery backwards can damage some electronicsgot you, no meter.tow it to a shop, or1: check all fuses, cab and hood.2: do the head lights work ( it takes no key to do that) if fails, fix this first (fuses are blown)or battery is dead or installed backwards.3: turn the key to on.do all normal warning lamps go out, after the delayor are they dead, if dead fuses ARE BLOWN.4: THE CEL lamp must glow key on or the PCM has no power, (fuses again) "check engine lamp"5: the Immobilizer lamp must go out, key on, or the IMMO is not happy, it does just as the name says.IMMO lamp in the cluster, tells you this,fact.there you go 5 stepsfuses that look bad are in fact bad.fuses that look ok, need to be tested, due to possible hair line cracks,.