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

Module Power and Ground


Object Number: 1849169  Size: FS
Master Electrical Component List
Trailer Brake Controls Description and Operation
Control Module References
Trailer Brake Controls
Ignition II/III Voltage
RUN/CRANK BUS - AIRBAG IGN, MISC IGN and SEO/ALC Fuses
FSCM, ITBC and RDO Fuses
Stop Lamp Controls and CHMSL
Stop Lamp Controls and CHMSL
Serial Data Communication Enable
High Speed Bus - 2 of 3
G401 and G403
Figure 2:

Trailer Brake Controls


Object Number: 1849170  Size: FS
Master Electrical Component List
Trailer Brake Controls Description and Operation
Control Module References
Module Power and Ground
Dimming Control and LED Dimming 1 of 3
ABS-1, ABS-2, HEAVY DUTY ABS, HVAC BLWR, STUD 1, STUD 2 and WSW/HTR Fuses
G401 and G403