I am having problems with a 2003 Blazer involving the warning lights in the instrument cluster. Wiring Diagrams of : power routing, grounding locations under the dash, fuse block to radio connections. tach, speedo,and gauges
don't work, while all warning lights are illuminated. this is my first post so
if I am not doing something right please forgive Me.

 

Using the search,

this guy had the exact same problem- turned out to be ignition switch plus something else:
https://blazerforum.com/forum/engine...art-now-21756/

this guys 2003 had similiar problems and it was the computer shorting out a relay :

https://blazerforum.com/forum/2nd-ge...tes-etc-47047/

Here is a TSB from GM about losing your dash instrument cluster:

https://blazerforum.com/forum/2nd-ge...-gauges-29188/

Sorry I don't have a wiring schematic for a 2003. Alot of searching and you'll find them piece by piece. The Haynes manuals don't have much for wiring schematics, only the dealer service/wiring manuals you buy from GM.

Good luck!

 

Would you have a wiring diagram for the 2001 blazer LS 2 wdr with the top glass window section separate bottom rear door. Would the diagram indicate if the tmier is separate from the defogger controller? Thanks in advance for any assistance you could provide

 

The cause of all my problems was a loose connector on the dash cluster.

Pin A9 was wallowed out.I re-crimp it and all's well. I found the wiring

diagrams I needed to at Tradebit.com. $19.95 for a manual that covers 1994

2005.