GM Service Manual Online
For 1990-2009 cars only
Figure 1:

Heated Mirrors


Object Number: 670019  Size: FS
Master Electrical Component List
Outside Mirror Description and Operation Heated Mirrors
Outside Rear View Mirror Switch
Ign ACC, RUN and RAP Bus Bar
IGN E Fuse and A/C Compressor, Rear Defogger, DRL Relays
ECM B Fuse and Horn, Rear Defogger Relays
HVAC I Fuse
Defogger Schematics
ILLUM Fuse 12
Headlight Leveling Schematics (Export)
G203 and G204 (Utility w/ Manual A/C)
G202 (Utility and Crew Cab)
G205 (Utility and Crew Cab)
G205 (Utility and Crew Cab)
Power and Ground
Figure 2:

Outside Rear View Mirror Switch


Object Number: 670023  Size: FS
Master Electrical Component List
Outside Mirror Description and Operation Heated Mirrors
Folding Mirrors (Envoy and Export Only)
Heated Mirrors
B+ Bus Bar
MIR/LKS, FOG LP Fuses and DRL, Headlamp Power Relays
Door Lock Switch Inputs
Door Lock Switch Inputs
Headlamp Switch
G202 (Pickup Except Crew Cab)
Figure 3:

Folding Mirrors (Envoy and Export Only)


Object Number: 670026  Size: FS
Master Electrical Component List
Outside Mirror Description and Operation Heated Mirrors
Outside Rear View Mirror Switch
Ign ACC, RUN and RAP Bus Bar
RDO IGN and STR WHL RDO IGN Fuses
Power and Ground (w/ Trip Computer)
S501 (Utility)
G202 (Utility and Crew Cab)