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Home >> Ford >> 1990 >> Thunderbird Base >> Repair and Diagnosis >> Electrical >> Gauges >> Instrument Panel - Electronic >> System Tests >> Test Sf: Display Has "S" Illuminated

Test Sf: Display Has "S" Illuminated

NOTE: If Electronic Instrument Cluster (EIC) has ever been replaced or serviced, "S" may be displayed at any time indicating EIC module has been replaced or has been serviced by an authorized factory dealer.

Verify if speedometer/odometer module is original module. Check for replacement speedometer/odometer mileage sticker on driver door pillar. If sticker exists, system is okay. If EIC, also referred to as speedometer/odometer module, is original equipment and has never been serviced, then EIC has failed or has become defective. Replace EIC (speedometer/odometer module) as an assembly with EIC. See ELECTRONIC INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION. After repair is complete, affix a mileage sticker on driver's door pillar indicating the mileage of vehicle at time of service.