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 MANUALSFORD2007FIVE HUNDRED AWD V6-3.0L VIN 1REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSINFORMATION BUSTESTING AND INSPECTIONPINPOINT TESTSTEST C: THE DIFFERENTIAL ELECTRONIC MODULE (DEM) DOES NOT RESPOND TO THE SCAN TOOL
2007 Ford Five Hundred AWD V6-3.0L VIN 1
Test C: The Differential Electronic Module (DEM) Does Not Respond To The Scan Tool
2007 Ford Five Hundred AWD V6-3.0L VIN 1SECTION Test C: The Differential Electronic Module (DEM) Does Not Respond To The Scan Tool
PINPOINT TEST C: THE DIFFERENTIAL ELECTRONIC MODULE (DEM) DOES NOT RESPOND TO THE SCAN TOOL
Normal Operation
The DEM communicates with the scan tool through the high speed controller area network (HS-CAN). Circuits 1908 (WH) (HS-CAN +) and 1909 (BK) (HS-CAN -) provide the network connection to the DEM. The DEM shares the HS-CAN network with the powertrain control module (PCM), the transmission control module (TCM), the anti-lock brake system (ABS) module, the restraints control module (RCM) and the instrument cluster. Voltage for the DEM is provided by circuit 972 (BK/WH), and ground is provided by circuit 570 (BK).
Possible Causes
- Fuse
- Circuit 570 (BK) open
- Circuit 972 (BK/WH) open
- Circuit 1908 (WH) open (MS-CAN +)
- Circuit 1909 (BK) open (MS-CAN -)
- DEM
C1-C2:
C3-C4:
Normal Operation
The DEM communicates with the scan tool through the high speed controller area network (HS-CAN). Circuits 1908 (WH) (HS-CAN +) and 1909 (BK) (HS-CAN -) provide the network connection to the DEM. The DEM shares the HS-CAN network with the powertrain control module (PCM), the transmission control module (TCM), the anti-lock brake system (ABS) module, the restraints control module (RCM) and the instrument cluster. Voltage for the DEM is provided by circuit 972 (BK/WH), and ground is provided by circuit 570 (BK).
Possible Causes
- Fuse
- Circuit 570 (BK) open
- Circuit 972 (BK/WH) open
- Circuit 1908 (WH) open (MS-CAN +)
- Circuit 1909 (BK) open (MS-CAN -)
- DEM
RENDER: 1.0x
NO RELATED
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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.