MDX V6-3471cc 3.5L (2002)
Transmission Shift Position Indicator Lamp: Description and Operation
How the Circuit Works
With the ignition switch in ON (II) or START (III), voltage is applied to the A/T gear position indicator. The A/T gear position switch provides a ground
for each position. As an input is grounded, its indicator light comes on. If you select R, for example, ground will be applied to the input of the A/T gear
position indicator, and the R indicator will come on.
With the headlight switch in PARK or HEAD, voltage is applied to the RED/BLK wire terminal. This changes the indicator panel illumination from
fixed to controlled by the dash lights dimmer input through the RED wire.
When the PCM detects an abnormality in the automatic transmission control system, or when you request DTCs (diagnostic trouble codes) through the
DLC (data link connector), the PCM will make the D5 indicator light blink.
When the transmission is in the sequential sportshift mode, the shift switch sends "shift down" and "shift up" inputs to the PCM. The PCM in turn
controls the shift indicator to display the proper gear selected.
