Speedo stopped working

Z

zeebedee

Newbie
Joined
Aug 26, 2021
Points
3
Hi, not sure if related but I’ve changed the seats in my Z3 from facelift to pre-facelift using the BMW seat conversion lead, but since then I’ve noticed the Speedo has stopped working?! Could it be electrical or something else?
 
It will be electrical.
  • Check the Speedo's operation with the hidden cluster tests. In the linked thread there are 2 sets of instructions Post #1 and Post #12. You'll need to work out which is correct for your car. You want the Cluster self test. In Post #1 it is test 2. In Post #12 it is test 1. Make sure the speedo is going full range. https://www.bimmerforums.com/forum/showthread.php?736153-Test-Mode-Hidden-Codes-in-your-car!
  • Inspect the speedo sensor on the diff cover plate. It is pushed in? Are the connector pins clean?
 
Disconnecting the sensor on the Diff. cover and applying some Electrical Contact cleaner spray may help.

Tony.
 
My “no speedometer” problem ended up being a broken or chewed up (mice) wire. The two wires connected to the diff sensor end up connecting to the dash cluster. I pulled the cluster, ran jump wires, and checked for continuity with a multimeter. One worked, one was broken. I ran a new 18 gauge wire from the the sensor to the cluster and it worked again 🙂. Maybe a wire got pinched when the seats were changed out?
 
You must log in or register to reply here.
Back
Top