This little box includes 5 high side (positive) outputs and a multiplexer to convert a transmission range selector with multiple +12V signals into an analog signal.

This allows the 4 speed transmission found in Nissan Patrol Y60 and Y61 cars to be controlled from a DID1 or LPC8 ECU, and likely other Japanese transmissions that have the solenoids grounded inside the transmission.

The box has two connectors, the 20 pin connector is wired to the car's transmission loom, while the 12 pin connector connects to the ECU.

Pin-out of 20 pin connector:

1. Gear selector position 1 (Pin 26 green in Y61 Patrol TCU)
2. Gear selector position 2 (Pin 27 green/white in Y61)
3. Gear selector position D (Pin 34 pink in Y61)
4. Gear selector position N (No connection in Y61)
5. Gear selector position R (Pin 35 yellow in Y61)
6. Gear selector position P (Pin 36 white in Y61)
7. Overdrive off signal (pass through) (Pin 22 grey in Y61)
8. Power ground (Pin 25 black in Y61)
9. +12V input (Pin 10 green/orange in Y61)
10. +12V input (Pin 19 green/orange in Y61)
11. Sensor ground for temperature and speed sensors (Pin 42 black in Y61)
12. Speed sensor input (pass through) (Pin 29 white in Y61)
13. Mode input (pass through) (Pin 43 white/green in Y61)
14. Mode light output (pass through) (Pin 13 red/white in Y61)
15. Temperature sensor (pass through) (Pin 47 red in Y61)
16. Solenoid 1 output (Pin 11 blue/white in Y61)
17. Solenoid 2 output (Pin 12 blue/red in Y61)
18. Solenoid 3 output (Pin 20 blue/black in Y61)
19. Solenoid 4 output (Pin 1 grey in Y61 for line pressure)
20. Solenoid 5 output (Pin 3 green/orange in Y61 for lock up)

1. Solenoid 5 control from ECU (Pin A21 on LPC4)
2. Solenoid 4 control from ECU (Pin A22 on LPC4)
3. Solenoid 3 control from ECU (Pin B5 on LPC4)
4. Solenoid 2 control from ECU (Pin B4 on LPC4)
5. Solenoid 1 control from ECU (Pin B3 on LPC4)
6. Sensor ground from ECU (Pin A4 on LPC4)
7. Mode light output from ECU (Pin B1 on LPC4)
8. Temperature sensor signal to ECU analog input (Pin A14 on LPC4)
9. Gear selector position signal to ECU analog input (Pin A3 on LPC4)
10. Mode switch input to ECU digital input (Pin A13 on LPC4)
11. Speed sensor signal to ECU digital input (Pin A17 on LPC4)
12. Overdrive off signal to ECU digital input (Pin A23 on LPC4)