GMC Cadillac CTS 2004 Owner's Manual page 401

Rear Underseat Fuse Block
(Driver's Side)
The driver's side rear fuse block is located under the
rear seat on the driver's side of the vehicle. The rear
seat cushion must be removed to access the rear
fuse block. See "Removing the Rear Seat Cushion"
listed previously.
To access the fuse block, push in the two tabs located
at each end of the fuse block cover. Then lift the
cover off.
Relays
BAS RELAY
Brake Apply Sensor
MINI
SPARE Not Used
SPARE Not Used
PUSHER FAN Pusher Fan (Export Only)
L POSITION
Driver's Side Position Lamp
RELAY MICRO
R POSITION
Passenger's Side Position Lamp
RELAY MICRO
IGN 3 RELAY Heated Seat Modules, Air Inlet
MICRO Motor, Shifter Assembly
STANDING
LAMP Control for Position Lamp Relays
RLY MICRO
TRK DR REL
SOL RELAY Trunk Release Motor
MICRO
REV LAMP ISRVM (Inside Rearview Mirror),
RELAY MICRO License Plate Lamp Assembly
Usage
5-107