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.
2005 Saturn L300FACTORY OEM SERVICE PROCEDURE
Control Units
CONTROL UNITS LOCATION
| Component | Location |
|---|---|
| Blower Motor Speed Control Module | On front of HVAC assembly. See Figure . |
| Body Control Module (BCM) | Mounted to top of glove box. See Figure . |
| Cooling Fan Control Module | Near battery. See Figure . |
| Cruise Control Module (CCM) | At left rear of engine compartment. See Figure . |
| Electronic Brake Control Module (EBCM) | At left rear of engine compartment. See Figure . |
| Electronic PRNDL Module Connector | Under center console. See Figure . |
| Engine Control Module (ECM) | On top right rear of engine. See Figure . |
| HVAC Control Module | At lower center of dash. See Figure . |
| Ignition Control Module (ICM) (2) | Top rear of the engine, in the camshaft covers. See Figure . |
| Inflatable Restraint I/P Module | Behind right side of dash. See Figure . |
| Inflatable Restraint Sensing & Diagnostic Module (SDM) | At center of vehicle, under center console. See Figure . |
| Inflatable Restraint Side Impact Module- Left | Behind left "C" pillar trim. See Figure . |
| Inflatable Restraint Side Impact Module- Left Connector (Sedan) | At base of left "C" pillar. See Figure . |
| Inflatable Restraint Side Impact Module- Left Connector (Wagon) | At left rear quarterpanel. See Figure . |
| Inflatable Restraint Side Impact Module- Right | Behind right "C" pillar trim. See Figure . |
| Inflatable Restraint Side Impact Module- Right Connector (Sedan) | At base of right "C" pillar. See Figure . |
| Inflatable Restraint Side Impact Module- Right Connector (Wagon) | At right rear quarterpanel. See Figure . |
| Inflatable Restraint Steering Wheel Module | In steering wheel. See Figure . |
| I/P Module | Behind top right side of dash. See Figure . |
| Roof Rail Module- Left | At top of left "C" pillar. See Figure . |
| Roof Rail Module- Right | At top of right "C" pillar. See Figure . |
| Sensing & Diagnostic Module (SDM) | Under rear of floor console. See Figure . |
| Sunroof Module | At front center of roof, under headliner. See Figure . |
| Throttle Actuator Control (TAC) Module | At top front of engine, on throttle body. See Figure . |
| Transmission Control Module (TCM) | Right side of engine compartment. |
Factory Service Tools
Use the Manual With the Right Hardware
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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.