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 MANUALSFORD2009FUSION SEL, 3.0 1, FWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 165 (MULTIFUNCTION ELECTRONIC MODULES SYSTEM)DIAGNOSIS AND TESTINGDRIVER SEAT MODULE (DSM)PINPOINT TESTPINPOINT TEST B: NO COMMUNICATION WITH THE DRIVER SEAT MODULE (DSM)TESTING
2009 Ford Fusion SEL, 3.0 1, FWD
Pinpoint Test B: No Communication with the Driver Seat Module (DSM): Testing
2009 Ford Fusion SEL, 3.0 1, FWDSECTION Testing
WARNING: This page is about a different car, the 2005 Mercury Montego, 2005 Ford Freestyle, and 2005 Ford Five Hundred. However, it is still accessible from the selected car via links, so may be relevant.
- B1 CHECK THE DSM VOLTAGE SUPPLY CIRCUITS FOR AN OPEN
- Key in OFF position.
- Disconnect: DSM C341a.
- Disconnect: DSM C341c.
- Measure the voltage between the DSM C341a-2, circuit 566 (DG), harness side and ground; and between the DSM C341c-1, circuit 956 (OG/LG), harness side and ground.
- Are the voltages greater than 10 volts?
- Yes : GO to B2.
- No : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
- B2 CHECK THE DSM GROUND CIRCUIT FOR AN OPEN
- Measure the resistance between the DSM C341a-1, circuit 1205 (BK), harness side and ground; and between the DSM C341c-13, circuit 1203 (BK/LB), harness side and ground.
- Are the resistances less than 5 ohms?
- Yes : REFER to MODULE COMMUNICATIONS NETWORK to continue communication diagnosis.
- No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
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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.