Status Lights Display

Upon entering PCM system level of self-diagnostic mode, indicator lights on ECC panel automatically indicate operational status of Viscous Converter Clutch (VCC), certain emission control components and A/C compressor operation. Operational status of these components is indicated by corresponding status light being on or off. See Fig 1 .

Fig 1: Identifying PCM Status Indicators

Courtesy of GENERAL MOTORS CORP.

Fig 2: SERVICE MODE Chart (1 of 2)

Courtesy of GENERAL MOTORS CORP.

Fig 3: SERVICE MODE Chart (2 Of 2)

Courtesy of GENERAL MOTORS CORP.