Transmission Position Sensor/Switch: Description and Operation
PRNDL DISPLAYThe IPC displays the selected gear position as determined by the PCM. The IPC receives a class 2 message from the PCM indicating the gear position. The PRNDL display blanks if:
^ The PCM detects a malfunction in the transmission range switch signal circuit.
^ The IPC receives a class 2 message indicating the park position and the column park switch indicates a position other than park.
^ The IPC detects a loss of class 2 communications with the PCM.