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 MANUALSFORD1991THUNDERBIRD LX, 5.0 TREPAIR AND DIAGNOSISACCESSORIES & EQUIPMENTSEATSSEATS - POWERTESTINGSENSOR ASSEMBLY TEST
1991 Ford Thunderbird LX, 5.0 T
Sensor Assembly Test
1991 Ford Thunderbird LX, 5.0 TSECTION Sensor Assembly Test
- Disconnect motor and sensor harness leads from power seat assembly (connectors P1 and P2). See Fig 1 .
- With jumper wire, connect together terminal No. 437 and terminal No. 266 of connectors P1 and P3. Connect together terminal No. 435 and terminal No. 57A of same connectors. Leave connector P3 attached. Connect one lead of ohmmeter to terminal No. 57A and other lead to terminal No. 438 of connector P1.
- Attach 2 jumper wires to terminal No. 980 and terminal No. 981 of connector P2. Connect end of one jumper to terminal No. 517 of connector P3. Tap the free jumper lead to terminal No. 57 of same connector. Seat should move. If not, reverse jumper leads.
- Continue pattern of tapping a jumper lead to move seat while observing reading of ohmmeter in between movements. Reading should alternate between no continuity (open circuit) and a resistance of less than 20 ohms.
- If sensor resistance remains consistently open or consistently less than 20 ohms after moving seat through several cycles, sensor is defective and sensor assembly should be replaced.
- Repeat steps 2) through 5) for remaining 2 sensors if necessary. For second sensor, use terminal No. 441 instead of terminal No. 438 in step 2) and terminal No. 979 and terminal No. 990 instead of terminal No. 980 and terminal No. 981 in step 3). For third sensor, use terminal No. 436 instead of terminal No. 438 in step 2) and Terminal No. 982 and terminal No. 983 instead of terminal No. 980 and terminal No. 981 in step 3).
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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.