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 MANUALSFORD2004FREESTAR V6-4.2L VIN 2REPAIR AND DIAGNOSISACCESSORIES AND OPTIONAL EQUIPMENTRADIO, STEREO, AND COMPACT DISCTESTING AND INSPECTIONPINPOINT TESTSTEST D
2004 Ford Freestar V6-4.2L VIN 2
Test D
2004 Ford Freestar V6-4.2L VIN 2SECTION Test D
PINPOINT TEST D: THE AUXILIARY AUDIO CONTROL IS INOPERATIVE/DOES NOT OPERATE CORRECTLY - STEERING WHEEL CONTROL SWITCHES
Normal Operation
The steering wheel audio control consists of a specific resistor value for each button function creating a voltage divider. When a button is pressed, a specific reference voltage is sent to the audio unit. The audio unit then uses this reference voltage to determine which control input function has been selected. Circuit 595 (LB/RD) is the reference voltage circuit between the steering wheel audio controls and the audio unit.
Possible Causes
- steering wheel audio controls
- audio unit
- clockspring
- circuit 595 (LB/RD) open or short to ground
- circuit 1205 (BK) open
Test D1-D2:
Test D2-D4:
Test D4-D5:
Normal Operation
The steering wheel audio control consists of a specific resistor value for each button function creating a voltage divider. When a button is pressed, a specific reference voltage is sent to the audio unit. The audio unit then uses this reference voltage to determine which control input function has been selected. Circuit 595 (LB/RD) is the reference voltage circuit between the steering wheel audio controls and the audio unit.
Possible Causes
- steering wheel audio controls
- audio unit
- clockspring
- circuit 595 (LB/RD) open or short to ground
- circuit 1205 (BK) open
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.