Wiring diagrams, TRS - Gray 8 way plug
First lets look at the pin diagram
of the gray 8 way connector coming from the Transmission Range Sensor.
We have seven wires coming from the
TRS. Lets sort them out. The wires coming out of the TRS are different colors
than those on the harness side. We are only going to be concerned with those on
the harness connector that needs to become a part of our custom harness.
-
Pin 1 TRS 1-2 Sense - This is a violet with white stripe wire. It needs to
connect to Pin 21 on the TCM plug. (Also known as TRS
T42 sense). It's purpose is to apply 12 volts to pin 21 on the TCM
letting the TCM know that the shifter is in the 1-2 range.
-
Pin 2 TRS 3
Sense - This is a violet wire. It needs to connect to Pin 9 on the TCM
plug. It's purpose is to apply 12 volts to pin 9 on the TCM telling the TCM
that the shifter is in the 3 range.
-
Pin 3 Fused Ignition Switch Output (Run-Start) - This is a white wire. When you
turn on the key to the run or start mode this sends power to the TRS. The TRS
then uses this power to send signals to the TCM indicating what range the
shifter is in. This will tie into the wire bundle coming out of the TJ PCM on
connector 1 pin A2.
-
Pin 4 TRS
Overdrive Sense - This is a light green with black stripe wire. It
needs to connect to Pin 22 on the TCM plug. It's purpose is to apply 12 volts
to pin 22 on the TCM telling the TCM that the shifter is in the OD range.
-
Pin 5 (Not used)
-
Pin 6 TRS Reverse Sense - This is a brown with light green stripe wire. It needs
to connect to Pin 18 on the TCM plug. It's purpose is to apply 12 volts to pin
18 on the TCM telling the TCM that the shifter is in the reverse range.
(Also known as Back Up Lamp Feed)
-
Pin 7 Park/Neutral Position Switch Sense - This is a black with white stripe
wire. It's purpose is to ground the Park/Neutral circuit on the TJ harness
when you shift into Park or Neutral so that the starter relay can be engaged
which in turn allows the motor to be started. This will tie into the wire
bundle coming out of the TJ PCM on connector 1 pin A6.
-
Pin 8 Ground - This is the ground necessary to complete the Park/Neutral
circuit. It will tie into the wire bundle coming out of the TJ PCM on
connector 1 pin 31 or 32.

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