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 2WD V6-3.0L VIN 1REPAIR AND DIAGNOSISHEATING AND AIR CONDITIONINGTESTING AND INSPECTIONPINPOINT TESTSTEST M: THE BLOWER MOTOR IS INOPERATIVE - EATC
2007 Ford Five Hundred 2WD V6-3.0L VIN 1
Test M: The Blower Motor is Inoperative - EATC
2007 Ford Five Hundred 2WD V6-3.0L VIN 1SECTION Test M: The Blower Motor is Inoperative - EATC
PINPOINT TEST M: THE BLOWER MOTOR IS INOPERATIVE - EATC
Normal Operation
Under normal operation, the blower motor relay coil receives a ground from the EATC module through circuit 1322 (BN/WH). The coil receives voltage ignition voltage through circuit 296 (WH/VT). Voltage is supplied to the relay switch contact through circuit 364 (BK/LG). When the relay coil is energized, voltage is delivered to the blower motor and the blower motor control module through circuit 261 (OG/BK). Ground for the motor is provided through circuit 515 (OG/RD) from the blower control module. Ground for the blower control module is provided by circuit 1205 (BK). The EATC module sends pulse width modulated signal to the blower control module through circuit 1120 (BK/WH) to control the blower speed.
Possible Causes
- An open in circuit 1205 (BK), 261 (OG/BK), 1322 (BN/WH), 515 (OG/RD), 1120 (BK/WH), 296 (WH/VT) or 364 (BK/LG)
- A short to ground in circuit 1120 (BK/WH)
- A short to voltage in circuit 1322 (BN/WH)
- Blower motor relay
- Blower motor control module
- EATC module
- Blower motor
M1-M3:
M3-M5:
M6-M8:
M8-M10:
M11-M13:
M14:
Normal Operation
Under normal operation, the blower motor relay coil receives a ground from the EATC module through circuit 1322 (BN/WH). The coil receives voltage ignition voltage through circuit 296 (WH/VT). Voltage is supplied to the relay switch contact through circuit 364 (BK/LG). When the relay coil is energized, voltage is delivered to the blower motor and the blower motor control module through circuit 261 (OG/BK). Ground for the motor is provided through circuit 515 (OG/RD) from the blower control module. Ground for the blower control module is provided by circuit 1205 (BK). The EATC module sends pulse width modulated signal to the blower control module through circuit 1120 (BK/WH) to control the blower speed.
Possible Causes
- An open in circuit 1205 (BK), 261 (OG/BK), 1322 (BN/WH), 515 (OG/RD), 1120 (BK/WH), 296 (WH/VT) or 364 (BK/LG)
- A short to ground in circuit 1120 (BK/WH)
- A short to voltage in circuit 1322 (BN/WH)
- Blower motor relay
- Blower motor control module
- EATC module
- Blower motor
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.