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Home >> Ford >> 1992 >> Thunderbird Base, 5.0 T >> Repair and Diagnosis >> Suspension >> Electronic Suspension >> Automatic Ride Control >> Circuit Diagnostic Tests >> Module Input Test D19 >> Checking FIRM Signal

Checking FIRM Signal

  1. Turn ignition off. Open trunk, and lower module package tray behind left side of back seat. Disconnect ARC module 60-pin connector. At ARC module 60-pin connector, ensure Dark Green/Yellow wire (circuit No. 418) is securely attached to pin No. 18. Turn ignition on. Set ride control switch to FIRM position.
  2. Using DVOM, check voltage between pins No. 18 and 60 at ARC module 60-pin connector. If voltage is zero volts, go to TEST D20. If voltage is 12 volts, replace ARC module.
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