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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.
