Transmission Range Sensor

The Transmission Range Sensor (TRS) contacts are used to determine the position of the shift lever and also to control the reverse lamps. The TCM determines the shift lever position based on the table below.

Shift lever position Range Switch states
R D D3 L
P off off off off
R on off off off
N off off off off
OD off on off off
3 off off on off
1-2 off off off on

There are five switches in the TRS, 1 each for the 1-2, 3, OD, Reverse and Park/Neutral. The Park/Neutral portion of the TRS is hard wired to the Powertrain Control Module (PCM). The Park/Neutral information is received by the TCM from the PCM over the CCD communication bus. 12 volts is supplied to the TRS through the fused ignition switch output circuit. The TCM senses this voltage when a switch is closed. When the reverse switch is closed, power is supplied to the reverse lamps.