Where are you or the car located? Is it a gen 1 or gen 2? Do you have any aftermarket electrical parts like a sub woofer, navigation, cb or ham radio?
When the jumper cables are connected do the horn, flashers work? Those are fused to the positive cable. THe positive cable has 5 fuses made into it including a 100 amp one that goes to the car, then 4 smaller ones for a few of the above mentioned items. Pull ff the red cover, the fuses are under it and I believe made into the positive terminal, but you can see if they are broken/blown.
Have they tried disconnecting the ground and using the jumper ground to take the battery out of the loop?
Worse to worse, have AAA tow it to the dealer. If you are local Id look at it for you.
When the jumper cables are connected do the horn, flashers work? Those are fused to the positive cable. THe positive cable has 5 fuses made into it including a 100 amp one that goes to the car, then 4 smaller ones for a few of the above mentioned items. Pull ff the red cover, the fuses are under it and I believe made into the positive terminal, but you can see if they are broken/blown.
Have they tried disconnecting the ground and using the jumper ground to take the battery out of the loop?
Worse to worse, have AAA tow it to the dealer. If you are local Id look at it for you.