This relates to the later (6-speed) LS430 3UZ ECM.
I'm trying to work out the wiring for the A/C on my Hiace H200 conversion. I want to use the vehicle's existing a/c, which (a) works and (b) includes an additional rear system.
The Hiace compressor is different from the UZ-type (so it won't bolt on directly to the 3UZ), but it is similar in design/function to a later 1UZ, so physically the ideal solution is to buy one of those and get new hoses made for it. It has a clutch pulley and lock sensor like a VVTi a/c compressor, rather than a clutch and solenoid like the early 3UZ a/c compressor, or no clutch and a solenoid like the later 3UZ a/c compressor.
Using the Hiace's A/C Amplifier and a late 1UZ compressor, my wiring should be straightforward:![Hiace H18 Air Conditioning Amplifier Wiring Diagram-2.jpg Hiace H18 Air Conditioning Amplifier Wiring Diagram-2.jpg](https://www.lextreme.com/forums/data/attachments/12/12166-dabb699e5b66ea6754cf2c00fda2f4bc.jpg?hash=2rtpnltm6m)
(There are several other terminals on the A/C Amplifier, but not shown.)
The Lock Sensor needs a reference speed signal in order to function, so I was planning to get that signal from the +S terminal on the LS430 Combination Meter (which repeats the speed input signal generated by the vehicle's ABS computer--or, in my case, by an All4Swap LS430 instrument panel interface box).
I think I will add a new MG CLT relay and wiring and run that through my engine harness, rather than try to re-use the OEM wiring and relay--seems cleaner.
However, I'm not sure about the function of the CAN-bus connection between the A/C Amplifier and the OEM ECM. I suppose this connection is what tells the engine to increase the engine's idle speed when the A/C compressor is engaged? According to the wiring diagram, there is also a terminal for an "Idle-Up" switch on the A/C Amplifier, but my Hiace didn't have the switch, so I don't know if that terminal/function is enabled on my A/C Amplifier. My guess it that it would likely be present, so I should be able to use the All4Swap box to provide a GND to that terminal on the A/C Amplifier. Is there another way?
Ciao,
JZH
I'm trying to work out the wiring for the A/C on my Hiace H200 conversion. I want to use the vehicle's existing a/c, which (a) works and (b) includes an additional rear system.
The Hiace compressor is different from the UZ-type (so it won't bolt on directly to the 3UZ), but it is similar in design/function to a later 1UZ, so physically the ideal solution is to buy one of those and get new hoses made for it. It has a clutch pulley and lock sensor like a VVTi a/c compressor, rather than a clutch and solenoid like the early 3UZ a/c compressor, or no clutch and a solenoid like the later 3UZ a/c compressor.
Using the Hiace's A/C Amplifier and a late 1UZ compressor, my wiring should be straightforward:
![Hiace H18 Air Conditioning Amplifier Wiring Diagram-2.jpg Hiace H18 Air Conditioning Amplifier Wiring Diagram-2.jpg](https://www.lextreme.com/forums/data/attachments/12/12166-dabb699e5b66ea6754cf2c00fda2f4bc.jpg?hash=2rtpnltm6m)
(There are several other terminals on the A/C Amplifier, but not shown.)
The Lock Sensor needs a reference speed signal in order to function, so I was planning to get that signal from the +S terminal on the LS430 Combination Meter (which repeats the speed input signal generated by the vehicle's ABS computer--or, in my case, by an All4Swap LS430 instrument panel interface box).
I think I will add a new MG CLT relay and wiring and run that through my engine harness, rather than try to re-use the OEM wiring and relay--seems cleaner.
However, I'm not sure about the function of the CAN-bus connection between the A/C Amplifier and the OEM ECM. I suppose this connection is what tells the engine to increase the engine's idle speed when the A/C compressor is engaged? According to the wiring diagram, there is also a terminal for an "Idle-Up" switch on the A/C Amplifier, but my Hiace didn't have the switch, so I don't know if that terminal/function is enabled on my A/C Amplifier. My guess it that it would likely be present, so I should be able to use the All4Swap box to provide a GND to that terminal on the A/C Amplifier. Is there another way?
Ciao,
JZH