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 Saturn Ion Red LineFACTORY OEM SERVICE PROCEDURE
Electrical Component Locator: Splices
SPLICES LOCATION
| Component | Location |
|---|---|
| SP101 | In forward lamp harness, near left headlamp. |
| SP401 | In body harness, near left rear speaker. |
| SP403 | In body harness, near right rear speaker. |
| S139 | In fuel injectors harness, at breakout for manifold absolute pressure (MAP) sensor. |
| S150 | In engine harness, 5 cm from engine harness breakout. |
| S156 | In engine harness, 5 cm from starter cable breakout. |
| S158 | In engine harness, 6 cm from starter solenoid breakout. |
| S160 | In engine harness, 1 cm from oil pressure switch. |
| S175 | In engine harness, 35 cm from engine harness breakout. |
| S205 | In I/P harness, 5 cm from data link connector (DLC) breakout. |
| S215 | In I/P harness, 6 cm from data link connector (DLC) breakout. |
| S221 | In I/P harness, 10 cm from electronic power steering (EPS) assembly breakout. |
| S227 | In I/P harness, 22 cm from turn signal/multifunction switch breakout. |
| S233 | In I/P harness, 5 cm from ambient light sensor breakout. |
| S239 | In I/P harness, 6 cm from breakout for C235. |
| S250 | In I/P harness, 11 cm from HVAC control module breakout. |
| S260 | In I/P harness, 6.5 cm from blower motor breakout. |
| S270 | In I/P harness, 5.5 cm from body control module (BCM) breakout. |
| S335 | In body harness, 15 cm from auxiliary power outlet breakout. |
| S337 | In body harness, 7.5 cm from auxiliary power outlet breakout. |
| S351 | In body harness, 38.5 cm from auxiliary power outlet breakout. |
| S360 | In body harness, 24 cm from body control module (BCM) breakout. |
| S375 | In headliner harness, 10 cm from dome lamp breakout. |
| S411 | In body harness, 7.5 cm from left rear speaker breakout. |
| S413 | In body harness, 7.5 cm from rear compartment light breakout. |
| S511 | In driver's door harness, 4 cm from outside rearview mirror switch breakout. |
| S533 | In driver's door harness, 3.5 cm from driver's door lock switch breakout. |
| S555 | In driver's door harness, 19 cm from driver's outside rearview mirror breakout. |
| S557 | In driver's door harness, 11.5 cm from driver's outside rearview mirror breakout. |
| S656 | In right front passenger's door harness, 13 cm from right front door tweeter speaker breakout. |
| S658 | In right front passenger's door harness, 5.5 cm from right front door tweeter speaker breakout. |
| S990 | In deck lid harness, 10 cm from rear compartment lid release actuator breakout. |
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.
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