BMW Coupes and Sedans 1970-1988 Repair Guide

Service Interval Assembly


The Service Interval (SI) display circuit board, if equipped in your vehicle, is removable only on the 3 Series models. Other vehicles have the Service Interval assembly as an integral part of the instrument panel.

Most problems with the SI stem from bad connections, faulty grounds, relays replaced with nonstandard non diode type relays, or bad batteries. The circuit board can be exchanged or have the batteries replaced by soldering new tab batteries in place. Because of the delicate nature of the repair, it is best if this procedure is performed by a BMW dealer.


3 Series Models
  1. Remove the instrument cluster.
  3. Disassemble the instrument cluster to separate the carrier from the instruments.
  5. Remove the screw holding the light guide at the center of the carrier assembly. Slide the Service Interval circuit board out.