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.
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HOMESERVICE MANUALSFORD2004ECONOLINE E150, VAN CARGO, 4.6 WREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 313 (HVAC CONTROL SYSTEM)DIAGNOSIS AND TESTINGCLIMATE CONTROL SYSTEMCONNECTOR CIRCUIT REFERENCESMART JUNCTION BOX C2280C
2004 Ford Econoline E150, Van Cargo, 4.6 W
Smart Junction Box C2280c
2004 Ford Econoline E150, Van Cargo, 4.6 WSECTION Smart Junction Box C2280c
WARNING: This page is about a different car, the 2004 Mercury Monterey and 2004 Ford Freestar. However, it is still accessible from the selected car via links, so may be relevant.
SMART JUNCTION BOX C2280C CIRCUIT REFERENCE
| Pin Number(s) | Circuit Designation/Description | Normal Condition/Measurement |
|---|---|---|
| 10 | CKT 1371 (TN/OG) auxiliary blower motor relay switched ground | Greater than 10 volts at all times. |
| 14 | CKT 1322 (BN/WH) blower motor relay switched ground | Greater than 10 volts with the ignition on. |
| 24 | CKT 1372 (PK/BK) auxiliary blower motor speed relay 1 switched ground | Greater than 10 volts at all times. |
| 25 | CKT 1373 (GY/YE) auxiliary blower motor speed relay 2 switched ground | Greater than 10 volts at all times. |
| 32 | CKT 1382 (BK/OG) auxiliary temperature blend door actuator potentiometer ground | Greater than 10,000 ohms to chassis ground and 0 volts. |
| 33 | CKT 1125 (BN) auxiliary mode door actuator potentiometer ground | Greater than 10,000 ohms to chassis ground and 0 volts. |
| 34 | CKT 3060 (GY/RD) ambient air temperature sensor ground | Less than 10 ohms to chassis ground with the ignition on. |
| 36 | CKT 1124 (WH) auxiliary mode door actuator potentiometer reference voltage | Greater than 10,000 ohms to chassis ground and 0 volts. |
| 45 | CKT 1126 (LB) auxiliary temperature blend door actuator potentiometer feedback circuit | Greater than 10,000 ohms to chassis ground and 0 volts. |
| 46 | CKT 1131 (LG) auxiliary mode door actuator potentiometer feedback circuit | Greater than 10,000 ohms to chassis ground and 0 volts. |
| 47 | CKT 3061 (LB/OG) ambient air temperature sensor reference circuit | Greater than 10 volts with the ignition on. |
| 49 | CKT 1381 (WH/LB) auxiliary temperature blend door actuator potentiometer reference voltage | Greater than 10,000 ohms to chassis ground and 0 volts. |
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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.