GMC Envoy Owner's Manual page 447

Fuses
18 Airbag
19 Trailer Electric Brake
20 Cooling Fan
21 Horn
22 Ignition E
23 Electronic Throttle Control
Instrument Panel Cluster, Driver
24
Information Center
Automatic Shift Lock Control
25
System
26 Engine 1
27 Backup
28 Powertrain Control Module 1
5-104
Usage Fuses
29 Powertrain Control Module
30 Air Conditioning
31 Injector Bank A
32 Trailer
33 Anti-Lock Brakes (ABS)
34 Ignition A
35 Blower Motor
36 Ignition B
50 Passenger's Side Trailer Turn
51 Driver's Side Trailer Turn
52 Hazard Flashers
53 Transmission
Usage