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Discussion Starter · #1 ·
Not sure if this is the correct forum be here goes
I sent my V70 R in for service at my local dealer, I forgot to reset the headlights back down on the manual adjusters. When It came back the lights were lower and the adjusters were maxed out. Now the dark nights are here I tried to fix it by doing a SUM download reset with Dice/Vida. It failed. I then tried to recalibrate the SUm using a method I found here hoping it would fix the headlight issue (lights manually adjusted down) This time I got an error message saying the left rear position sensor had too high a voltage. All other reading were OK.
I then checked the voltage of both position sensors and got the following readings LH 3.79V RH 1.80V I then read that the acceptable range was 0.5v-4.5v. So I should have been ok. ??
Additionally I now have DTC SUM-0221 position sensor calibration not accepted value,but no dash warning light/message. Additionally the three 4C settings still appear to work

Initial thought is to swap the sensors left to right as they are not handed and see if the problem moves side, but they appear to be a real PIA to get at and remove.

Is it likely the sensor is bad and I'd be better just swapping the LH unit out Should I just give up and visit local dealer/Indi to get matter resolved??

To day I have checked out the LH rear position sensor by disconnecting the bracket from the lower arm and then moving the sensor arm. As you move the arm up the voltage goes up and the reverse when its lowered. I also discovered that the voltage of these position sensors when the car is at rest is between 2-3 volts. Could this be why the LH is said to be too high??

Please any comments,suggestions welcome.



Cheers

Bob
 

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Were you on flat/level ground when you tried the sum recal? I know some people, myself included, have to jack the back end up a little in order to get the calibration to run. It seems like you have the basics down: manually adjust the lights to the max down position, run sum recal (with the lights in the "on" position, of course, then manually raise them after the recal is done.
 

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I believe you need to be at 2.5V.

The easiest way for me is to add the values to the parameter monitor and see them real time. That way adjusting to 2.5V is very easy.

Then run SUM and you are good to go.
 

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Discussion Starter · #5 ·
Thanks for the replies. Car suspension std. It sort of confirms one of the solutions I was considering - car is on level ground, remove the bracket off of the lower arm and fiddle with the sensor calibration until the voltage is approx 2.5volts and then do a recalibration.
My reservation was that the sum would then be using info that was "wrong" and that could cause ride other suspension issues.

Bob, when U say jack the back end up , I'm assuming you mean to raise the rear not and not to level the car. ( this causes the volt reading on the left to lower and the right to fall???? - I can check this myself)

Will try it and report back.

Thank you - suggestions/knowledge greatly appreciated

Cheers

Bob
 

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Discussion Starter · #6 ·
Followed the jack up advise and now all sorted. A huge thanks to those who helped. Got the calibration to work with voltages of 3.2v LH and 2.5v RH.
Lights now shine down the road not just 6' in front of bumper . DTC code gone too - Great result.

Cheers

Bob
 

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Awesome! Yeah, the need to raise up the back is usually an issue for those who have lowering springs, but these caRs are all a little different - glad it worked out.
 
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