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Home >> Jeep >> 1997 >> Cherokee 2WD L6-4.0L VIN S >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Shift Light >> Description and Operation
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Shift Light: Description and Operation

CIRCUIT OPERATION
The Powertrain Control Module (PCM) broadcasts the transmission up-shift message on the CCD bus. The microprocessor in the instrument cluster monitors the CCD bus and switches the up-shift lamp on or off by supplying or removing ground from the lamp. Circuit F87 from fuse 9 in the junction block powers the lamp.
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