Resetting the service interval indicator lights on BMW E30's and similarYou'll need a piece of electrical wire (10/15 cm) to serve as a jumper wire. According to Patrick Farrel, a BMW master tech working at a dealer in MD, you should always use a fused jumper wire. First, locate de diagnostic socket, at the engine compartment. There are two different types: up to 1987, it's located near the intake manifold, and has a red cap