2008 Hummer H3 Base, AutomaticFACTORY OEM SERVICE PROCEDURE

Electrical Component Locator: Connectors

CONNECTORS LOCATION

Component Location
X101 (Black, 6 Pin) (11) Rear center of engine. See Figure.
X115 (Black, 16 Pin) (8) Right of left front fog lamp. See Figure.
X116 (Black, 8 Pin) (9) Behind left headlamp assembly. See Figure.
X117 (Black, 8 Pin) (6) Behind right headlamp assembly. See Figure.
X125 (Black, 16 Pin) (2) Near battery. See Figure.
X130 (Black, 2 Pin) (10) In body harness to battery cable harness. See Figure.
X150 (Black, 16 Pin) (11) Behind battery, next to EBCM. See Figure.
X155 (Black, 4 Pin) (12) Next to EBCM. See Figure.
X200 (Black, 40 Pin) (5) Behind left of dash. See Figure.
X201 (Light Gray, 22 Pin) (3) Base of steering column. See Figure.
X203 (White, 8 Pin) (3) Near blower motor. See Figure.
X204 (Light Gray, 22 Pin) (4) Behind right kick panel. See Figure.
X205 (White, 12 Pin) (5) Near blower motor. See Figure.
X207 (White, 12 Pin) (6) Behind left of dash. See Figure.
X208 (Yellow, 4 Pin) (4) Behind left of dash. See Figure.
X275 (Yellow, 4 Pin) (7) Next to X201. See Figure.
X307 (White, 8 Pin) (7) Under driver seat. See Figure.
X308 (White, 4 Pin) (8) In body harness to driver seat belt switch jumper harness. See Figure.
X315 (White, 12 Pin) (6) Under passenger seat. See Figure.
X318 (Black, 4 Pin) (7) In passenger seat bottom. See Figure.
X319 (Black, 4 Pin) In driver seat bottom.
X320 (w/o Seat Heater) (White, 4 Pin) (5) In body harness to passenger seat belt switch jumper harness. See Figure.
X320 (w/Seat Heater) (White, 8 Pin) (5) In body harness to passenger seat belt switch jumper harness. See Figure.
X330 (White, 8 Pin) (2) Behind upper left "A" pillar trim panel. See Figure.
X335 (White, 6 Pin) (4) Behind upper left "A" pillar trim panel. See Figure.
X350 (White, 6 Pin) (1) Behind right lower "A" pillar trim. See Figure.
X370 (White, 12 Pin) (8) In left rear passenger door. See Figure.
X380 (White, 12 Pin) (2) In right rear passenger door. See Figure.
X410 (Black, 4 Pin) (4) Behind right rear quarter trim panel, near "D" pillar. See Figure.
X420 (w/Heavy Duty harness) (Black, 16 Pin) Rearward of left wheelwell.
X420 (w/o Heavy Duty Harness) (Black, 4 Pin) Rearward of left wheelwell.
X430 (White, 4 Pin) (1) Behind left rear quarter trim panel, near "D" pillar. See Figure.
X450 (White, 12 Pin) (8) Behind left rear quarter trim panel, near "D" pillar. See Figure.
X500 (White, 30 Pin) (4) In driver door. See Figure.
X510 (White, 8 Pin) (3) Inside middle front of drivers door, near "A" pillar. See Figure.
X600 (White, 30 Pin) (2) Body harness to passenger door harness, in passenger door. See Figure.
X901 (White, 12 Pin) (7) Left middle of end gate, near pass-through. 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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