i have a 90 SC without a keypad, i have a parts car with a key pad, i am wondering if i can remove the pad and install it into my car, is the car prewired for this option, i have a subaru wagon that had all the connectors for options even tho it did not have them i am just wondering if the SC was the same way or am i going to have to add a power, ground etc to the module from the other car