Automatic A/C: Ambient sensor airflow?

[dj92]

Thanks for your answer

Originally Posted by CTScott

I have also done a couple of the conversions, so I can help if you have any issues.

OK, another issue is the solar sensor - also pretty expensive here (80€ or so) and hard to get, so I feel tempted to test my electronic skills
It is drawn like a diode, so I would assume that it is a photo diode.
Have you made any experiments with usual photo diodes (dark vs. light current etc.) or did you always use the original sensor?

[CTScott]

Originally Posted by dj92

Thanks for your answer



OK, another issue is the solar sensor - also pretty expensive here (80€ or so) and hard to get, so I feel tempted to test my electronic skills
It is drawn like a diode, so I would assume that it is a photo diode.
Have you made any experiments with usual photo diodes (dark vs. light current etc.) or did you always use the original sensor?

The OEM sensors are used on many other Toyotas, so they can be found inexpensively. They are just photo diodes, but I didn't test the characteristics. I may have on hand. If I do I will check it out shortly.

I checked and do not have one, but the service manual for the Prius (which uses the same sensor) confirms it is a photo diode. The only specs it lists is that the resistance of the photo diode will be an open circuit in dark and not an open circuit in light.

[dj92]

Now I have got the parts and successfully soldered white LEDs into the control assembly, but I'm already running into problems.

Following the wiring diagram, I thought the servos to have included some LIN electronics or the like, so it could be on a 3 wire bus.

Instead, each one has 5 pins, 3 of them lead to some kind of rotary encoder and the other ones lead directly to the motor.

Before I start analyzing the PCB:
Do you have any hints to which pins these servos connect to?
Sadly, I was not able to get the connectors or even a wiring harness.

[CTScott]

Originally Posted by dj92

Now I have got the parts and successfully soldered white LEDs into the control assembly, but I'm already running into problems.

Following the wiring diagram, I thought the servos to have included some LIN electronics or the like, so it could be on a 3 wire bus.

Instead, each one has 5 pins, 3 of them lead to some kind of rotary encoder and the other ones lead directly to the motor.

Before I start analyzing the PCB:
Do you have any hints to which pins these servos connect to?
Sadly, I was not able to get the connectors or even a wiring harness.

I have always gotten them with the harness between the servos and the ECU, so I have never had to worry about that pinout. Let me see what I can find, as the service manual does not even show that info.

[dj92]

I have had a look at some drawings and have come to the conclusion that the servo controllers are a part of the rather small servo harness.
I am not a 100% sure, but it seems to cost about 160€.
That's a lot, however, the alternative would be building 3 servo controllers which would be cost effective, but take a bunch of weeks.
The even bigger problem is, the 4800 baud serial data on the bus pin does not change as I e.g. change where the air goes out according to the display.
Possibly, this is because the A/C is missing the other devices on the can bus, but the weather ATM is too cold for me to spend some hours outside in my car, so I hesitate to pull the original A/Cs fuses and hook it up to the bus.
Techstream requires the ECU to be present on the bus, so I can not do anything with it up to now.

My automatic A/C came from a european TS which is almost entirely JDM and has an air ionizer which I did not find on any wiring diagram - did you have any mysterious wires on the connectors you bought?

[CTScott]

Originally Posted by dj92

I have had a look at some drawings and have come to the conclusion that the servo controllers are a part of the rather small servo harness.
I am not a 100% sure, but it seems to cost about 160€.
That's a lot, however, the alternative would be building 3 servo controllers which would be cost effective, but take a bunch of weeks.
The even bigger problem is, the 4800 baud serial data on the bus pin does not change as I e.g. change where the air goes out according to the display.
Possibly, this is because the A/C is missing the other devices on the can bus, but the weather ATM is too cold for me to spend some hours outside in my car, so I hesitate to pull the original A/Cs fuses and hook it up to the bus.
Techstream requires the ECU to be present on the bus, so I can not do anything with it up to now.

My automatic A/C came from a european TS which is almostentirely JDM and has an air ionizer which I did not find on any wiring diagram - did you have any mysterious wires on the connectors you bought?

Everything made sense wiring-wise on what I had. I never had one with the ionizer.

[dj92]

I poked into it with Techstream and found out that it in fact misses the servo controllers - this single-wire bus is bi-directional.
You don't have only the harness with the controllers inside to sell, do you?