Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2004 Cadillac Escalade EXTFACTORY OEM SERVICE PROCEDURE
Electrical Component Locator: Connectors
CONNECTORS LOCATION
| Component | Location |
|---|---|
| C100 (Black, 16 Pin) | Below underhood fuse block. See Figure. |
| C102 (Black, 10 Pin) | Near underhood fuse block. See Figure. |
| C103 (Black, 12 Pin) | Near underhood fuse block. See Figure. |
| C104 (Black, 12 Pin) | Near underhood fuse block. See Figure. |
| C114 (Black, 10 Pin) | At front side of underhood fuse block. See Figure. |
| C115 (Black, 24 Pin) | Behind underhood fuse block. |
| C125 (Light Gray, 8 Pin) | On radiator support. |
| C127 (Light Gray, 8 Pin) | On radiator support. |
| C148 (Light Gray, 8 Pin) | On top left side of engine. |
| C149 (Light Gray, 8 Pin) | On top right side of engine. |
| C150 (Black, 4 Pin) | On left inner fender. See Figure. |
| C151 (Black, 12 Pin) | Behind underhood fuse block. See Figure. |
| C152 (Natural, 12 Pin) | Below underhood fuse block. See Figure. |
| C153 (Black, 3 Pin) | Attached to underhood fuse block mounting bracket. See Figure. |
| C154 (Black, 3 Pin) | Near underhood fuse block. See Figure. |
| C155 (Black, 10 Pin) | Near left top front of engine. |
| C198 (Black, 1 Pin) | Near underhood fuse block. |
| C201 (Black, 32 Pin) | On steering column. See Figure. |
| C202 (Black, 18 Pin) | Behind top of dash. See Figure. |
| C203 (Black, 3 Pin) | Near left I/P fuse block. |
| C206 (Light Gray, 22 Pin) | Behind left kick panel. |
| C209 (Black, 16 Pin) | Behind right kick panel. See Figure. |
| C210 (Black, 2 Pin) | Brake/clutch jumper harness to SEO jumper harness. |
| C214 (Black, 16 Pin) | Behind upper left side of dash. |
| C220 (Black, 24 Pin) | Behind center of dash. |
| C221 (Yellow, 4 Pin) | Behind left kick panel. |
| C222 (Yellow, 4 Pin) | Behind right kick panel. See Figure. |
| C249 (Black, 4 Pin) | Behind center of dash. |
| C250 (Gray, 6 Pin) | Behind left side of dash. |
| C305 (Black, 16 Pin) | Under left front seat. See Figure. |
| C306 (Black, 40 Pin) | Under front floor console. See Figure. |
| C310 (Natural, 17 Pin) | Behind left "B" pillar trim panel. See Figure. |
| C312 (Blue, 8 Pin) | In right rear of vehicle. See Figure. |
| C313 (Black, 3 Pin) | Behind left kick panel. |
| C315 (Black, 3 Pin) | Behind right kick panel. See Figure. |
| C320 (Gray, 13 Pin) | Under left front seat. See Figure. |
| C321 (Light Blue, 24 Pin) | Under left front seat. See Figure. |
| C322 (Natural, 10 Pin) | Under left front seat. See Figure. |
| C323 (Black, 6 Pin) | Under left front seat. See Figure. |
| C324 (Black, 8 Pin) | Under left front seat. See Figure. |
| C325 (Gray, 6 Pin) | Under left front seat. See Figure. |
| C326 (Gray, 6 Pin) | Under right front seat. See Figure. |
| C329 (Black, 4 Pin) | Under right front seat. See Figure. |
| C350 (Black, 2 Pin) | At top of transfer case. |
| C370 (Black, 14 Pin) | Below center console. |
| C388 (Black, 6 Pin) | Under right front seat. See Figure. |
| C390 (Black, 4 Pin) | Body harness to center sail harness. |
| C396 (Natural, 17 Pin) | Behind right "B" pillar trim panel. See Figure. |
| C397 (Except Tahoe & Yukon) (Black, 6 Pin) | Behind right rear quarterpanel. See Figure. |
| C397 (Tahoe & Yukon) (Black, 6 Pin) | Left rear passenger compartment. See Figure. |
| C399 (Black, 16 Pin) | Under right front seat. See Figure. |
| C402 (Gray, 7 Pin) | Near left rear frame rail. See Figure. |
| C405 (Black, 2 Pin) | Near left taillight assembly. See Figure. |
| C410 (Black, 2 Pin) | At right rear of vehicle. |
| C411 (Black, 2 Pin) | At left rear of vehicle. |
| C450 (Black, 38 Pin) | At right rear of vehicle. See Figure. |
| C499 (Gray, 12 Pin) | Behind right quarterpanel, near "D" pillar. See Figure. |
| C900 (Black, 3 Pin) | In rear liftgate. |
| C901 (Black, 8 Pin) | In rear liftgate. |
| Driver Power Seat Inline Connector | Below driver's seat. See Figure. |
| Forward Lamp Inline Connector | Near underhood fuse block. See Figure. |
| I/P Harness Inline Connector | Near underhood fuse block. See Figure. |
| I/P Inline Connectors | Near underhood fuse block. See Figure. |
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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