Power to hydraulic pump - C5

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carpy
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Power to hydraulic pump - C5

Post by carpy »

"On the pump connector there is a heavy contact which has 12V from the maxi fuse and a lighter contact which is the logic control input to the pump, if you connect 12V to the heavy terminal and 5V to the logic input the motor should run".

Hi, having removed most of the front of the car I can now gain access the 2 connectors mentioned above. There are 2 wires in the heavy terminal, green/yellow and red/white, does it matter which one I put a 12v feed to?
Also, any ideas how to get 5v feed as ordinary batteries are 1.5v or multiples thereof.
Many thanks.
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Post by xantia_v6 »

Might it be easier to measure if the car is already supplying the appropriate voltages to the connectors?

The heavy connector probably has a live feed and a ground wire, so must be connected with correct polarity.

I would imagine that for your purposes, 4.5V (1.5V x 3) would be sufficient and safe for the 5V input.
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Post by carpy »

Thanks for that. Seeing as the wires that earth to the bodywork are green/white, bit of a giveaway, my bad. I have checked the red/white wire and it is giving a pemanent live feed to the pump, is this correct.
Thanks
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Post by carpy »

Right. I'm confused. I put 4 1/2 volts positive into the single connector and earthed to the bodywork (the 12v live connector was plugged in) and nothing happened, I also unlocked and locked the car to see if that would make a difference - nothing. I then took the single connector coming off the loom and attached it to my multimeter which I earthed to the cars bodywork and unlocked and locked the car to see if there was any voltage and there wasn't.
Any thoughts please
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Post by wheeler »

Just curious as to where you got the info that the small connector has a 5v supply ?
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Post by lexi »

Can't help with leccy stuff but hats off to you on tackling this job anyway..........lots of work.
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Post by carpy »

The 5v info was supplied by a fellow forum member 'Cachaciero'.
Presumably the single wire connector provides some sort of power just trying to find out what makes it work.
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Post by cachaciero »

Twas indeed me that said it was 5 Volts.
Now I have to confess that I am not 100% sure it's 5Volts having never measured it. My reasoning was / is that the logic in the ECU runs on a standard logic supply of 5 Volts the height sensors are apparently fed with 5 Volts (garnered from other posts) and finally 5 Volts was a good point to start when applying external voltages if it is a 5V I/P and you applied 12Volts it may well go pop!.

Now back to your problem 5 Volts doesn't make it go try earthing it, in electronic switch terms it could just as well be a switch to ground to switch the pump on, i.e you have +12 to what is a switching module it may be that a ground on the trigger is required to complete the circuit.

If it was me given that i /we have no hard data on the circuitry I would be inclined to ground it with some kind of low value resistor in the circuit to ensure that there is some current limiting say a 6W lamp in series if it glows brightly then what you are doing may not be correct, the same appilies if you decide to try a higher +ve voltage.

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