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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Diagnosis - A/T >> Testing & Diagnosis (REATTA, Riviera, TORONADO & TROFEO) >> Status Light Indicators >> Med

Status Light Indicators: Med

Indicator light only indicates whether Torque Converter Clutch (TCC) is enabled (on) or disabled (off) by ECM. Actual TCC engagement depends on TCC system being in working order.



Indicator light will be on when BCM commands airflow out the A/C vents. Light should also be on in A/C and BI-LEV modes.