B2471

Diagnostic Chart:

Schematic:

CIRCUIT DESCRIPTION
The PZM may command the interior lamps through a discrete output to the courtesy lamps relay. The energized relay provides a ground for the interior lamps.

The PZM will test for a short to ground when Inadvertent power is active and the Interior lamps output is inactive and DTC B1971 is not current.

CONDITIONS FOR SETTING THE DTC
The commanded state of the interior lamps does not match the feedback state.

ACTION TAKEN WHEN THE DTC SETS
The PZM continues to command the requested state until the instrument cluster revokes the request.

CONDITIONS FOR CLEARING THE DTC
The commanded state matches the feedback state.