Test D24 - "Firm" Signal

Ensure Brown/Light Green wire is at pin No. 18 on 60-pin connector and is not damaged. Turn ignition on. Place selector switch in "FIRM" position. Using a voltmeter, check voltage between Brown/Light Green wire at pin No. 18 and Black wire at pin No. 60 on 60-pin connector. If there is no voltage, go to TEST D25  . If there is 12 volts, replace PRC module.