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Discussion Starter · #1 ·
Hi,

So the most serious issue is with the V60: it's apparently in front wheel drive mode only (karma). I'm getting wheel spin out of corners, torque steer and TC engaging when accellerating hard; not difficult with this power and FWD only. I've had the car for over a year and a half, and the only previous wheel spin was in heavy snow while climbing hills. I checked fuse #29 in panel B under the glove box and it was fine; I believe this is the correct fuse for the Haldex. I'm hoping this is a software issue and not a mechanical break. Is there anything else I can reset or check prior to taking it in for service?

On our XC60, the active high beams stopped working. I need to check that fuse after I figure out which one, but I think this is a job for the service guys. Maybe they'll fix the surround sound stereo function also while its there.
 

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Sound possibly like the Haldex pump has failed, although everyone who had that happen got a message saying AWD was disabled. Its a stretch, and counterintuitive, but could it be your new wider tires? Its possible the traction control is set up for the stock size and its confused. Its a stretch, but still a thought.
 

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I doubt it has anything to do with the tires. The AWD system shouldn't care how fast the wheels are turning at a given speed (because it doesn't actually know), just whether or not they are all turning at the same rate. Fresh tires on all four corners is the best possible situation. You first thought of the pump or something else internal (pressure sensor?) seems most likely.
 

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Is there a fuse for active high beams? Do you mean active bending?

fuse 16 in engine section B is "Active Bending Lightsheadlight leveling"
 

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I doubt it has anything to do with the tires. The AWD system shouldn't care how fast the wheels are turning at a given speed (because it doesn't actually know), just whether or not they are all turning at the same rate. Fresh tires on all four corners is the best possible situation. You first thought of the pump or something else internal (pressure sensor?) seems most likely.
The car has to know how fast each wheel is spinning because the car has torque vectoring. It has to somehow measure the speed of each wheel and compensate for it by braking the inner wheel in a turn. I agree its unlikely, but without a MIL light and a recent change in tire size, its just a thought.
 

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Discussion Starter · #6 ·
Is there a fuse for active high beams? Do you mean active bending?

fuse 16 in engine section B is "Active Bending Lightsheadlight leveling"
Our XC60 has the active high beams... You keep them on and when you approach another car they automatically adjust to low beams. This stopped working the other day.
 

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Discussion Starter · #7 ·
Sound possibly like the Haldex pump has failed, although everyone who had that happen got a message saying AWD was disabled. Its a stretch, and counterintuitive, but could it be your new wider tires? Its possible the traction control is set up for the stock size and its confused. Its a stretch, but still a thought.
I was wondering about the tire size.. The new tires are slightly taller (thicker sidewall) than the previous set. The dealer said they would adjust the software settings but I wouldn't be surprised if they neglected that. I've read somewhere that if the diameter is 4% beyond the stock setting, the Haldex could shut off AWD to avoid damage. I'm not sure if this is a legit Haldex 5 function? I know I had a donut spare on the right rear last year, and it did not shut off AWD.
 

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The car has to know how fast each wheel is spinning because the car has torque vectoring. It has to somehow measure the speed of each wheel and compensate for it by braking the inner wheel in a turn. I agree its unlikely, but without a MIL light and a recent change in tire size, its just a thought.
Right, the controller knows how fast each wheel is spinning so that it can compare each corner and take appropriate action if one starts to slip. What the Haldex unit doesn't have AFAIK is an alternate source of the car's speed. (My wording on that part wasn't great.) In other words, if the car is moving in straight line on good pavement it just sees that all four wheels are turning at xxxRPM. If all four wheels are turning 4% faster or slower than normal at 65MPH, Haldex won't care. What you need to avoid is one or more tires of a significantly different diameter from the others. If the mismatch is above a certain threshold the system may treat a wheel as if it's losing traction all the time. That's what overworks the system and causes problems. Since the car has four fresh, identical tires I think he's OK on that front.
 

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Our XC60 has the active high beams... You keep them on and when you approach another car they automatically adjust to low beams. This stopped working the other day.
Right, ours does too, just saying there's no fuse for that. The only fuse related to head lights is for active bending.
 

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Right, the controller knows how fast each wheel is spinning so that it can compare each corner and take appropriate action if one starts to slip. What the Haldex unit doesn't have AFAIK is an alternate source of the car's speed. (My wording on that part wasn't great.) In other words, if the car is moving in straight line on good pavement it just sees that all four wheels are turning at xxxRPM. If all four wheels are turning 4% faster or slower than normal at 65MPH, Haldex won't care. What you need to avoid is one or more tires of a significantly different diameter from the others. If the mismatch is above a certain threshold the system may treat a wheel as if it's losing traction all the time. That's what overworks the system and causes problems. Since the car has four fresh, identical tires I think he's OK on that front.
Just to play devils advocate, couldnt the system be looking for a preset wheelspeed, and since his tires are now bigger and rotate at a different speed than programmed, it believes there is slippage. How else would it know if slippage is happening without having a pre programmed set of parameters based on speed, throttle input etc.
 

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Just to play devils advocate, couldnt the system be looking for a preset wheelspeed, and since his tires are now bigger and rotate at a different speed than programmed, it believes there is slippage. How else would it know if slippage is happening without having a pre programmed set of parameters based on speed, throttle input etc.
Your theory is logical, except there's one really important thing that breaks it. The thing you have to ask yourself is this: how does a car's control system know how fast it's going?
 

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Your theory is logical, except there's one really important thing that breaks it. The thing you have to ask yourself is this: how does a car's control system know how fast it's going?
I would assume that the ECU knows the MPH and what that converts to in rotations per minute for a wheel of a certain diameter. When that changes within a tolerance, such as a curve or on snow it adjusts accordingly. The change in diameter may cause it to think something is happening when it isnt. By no means am I an expert in this area...
 

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Discussion Starter · #13 ·
Right, ours does too, just saying there's no fuse for that. The only fuse related to head lights is for active bending.
Oh gotcha..never thought to check that, and didn't notice if they were operating. Will check, thx.
 

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Our XC60 has the active high beams... You keep them on and when you approach another car they automatically adjust to low beams. This stopped working the other day.
Is your headlight switch set to the Auto position? That is required to use the active high beams. The one time my active high beams didn't work, I accidentally had my headlight switch in the low beam position (right most position).
 

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Discussion Starter · #15 ·
Is your headlight switch set to the Auto position? That is required to use the active high beams. The one time my active high beams didn't work, I accidentally had my headlight switch in the low beam position (right most position).
Son of a gun! The switch was not on auto, but at the on position. Wife just said she used a valet the other night while at a restaurant with co-workers; the valet must've turned the switch. :facepalm: Thanks for solving the mystery! That would've been embarrassing at the dealer service.
 

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Glad to pass on my experience with temporarily "losing" my active high beams.

Yeah, the headlight switch "on" position is actually the "low beams on", according to the owners manual. That explains the downward beam in the "on" icon. Sometimes RTFM helps in these cases.
 

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Glad to pass on my experience with temporarily "losing" my active high beams.

Yeah, the headlight switch "on" position is actually the "low beams on", according to the owners manual. That explains the downward beam in the "on" icon. Sometimes RTFM helps in these cases.
Your RTFM comment made me look at the tire section, and below it shows where it talks about different size tires:

<a href='http://i.imgur.com/UF5R8Et' title=''><img src='http://i.imgur.com/UF5R8Et.jpg' alt='' title='Hosted by imgur.com' /></a>
 

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Your RTFM comment made me look at the tire section, and below it shows where it talks about different size tires:

<a href='http://i.imgur.com/UF5R8Et' title=''><img src='http://i.imgur.com/UF5R8Et.jpg' alt='' title='Hosted by imgur.com' /></a>
hmm, that COULD affect many people who downsize their winter tire rims by an inch and increase sidewall if Volvo chooses to use that as a reason to deny warranty claims
 

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hmm, that COULD affect many people who downsize their winter tire rims by an inch and increase sidewall if Volvo chooses to use that as a reason to deny warranty claims
I posted it more for the instability portion than the warranty portion. Changing sizes is ok, I just assume it has to be a size that is available on the car. Im not sure if BMO Pete's are.
 

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Discussion Starter · #20 ·
Car's going in the shop next week, so will find out. It's definitely in FWD only.
 
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