GMC Chevrolet Express 2022 Owner's Manual page 191

190 Vehicle Care
Fuses Usage
75 Engine Control Module
76 Soot Sensors
(Diesel Only)
77 O2 Sensor 1
78 Engine Control Module/
Powertrain Signal 1
79 Ignition Coils/Injectors
Even
Relays Usage
15 Run/Crank
37
38 Fuel Pump
39 Crank
40 A/C Compressor
48
49 Powertrain
50
57
60
Auxiliary Fuse Block
This component is near the fuse block in the
engine compartment
Fuses Usage
MR-1 Upfitter 1
MR-2 Upfitter 2
MR-3 Upfitter Power Control
Relays Usage
MR Rel 1 Upfitter 1
MR Rel 2 Upfitter 2