Cruise control intermittent fault

bobdabuilda · Feb 23rd, 2011, 11:42

It's the first time I have noticed this but yesterday whilst driving the cruise control button wouldn't turn on the function at all. After stopping and turning off the ignition and then turning it back on the cruise control function worked fine again. Has anyone else noticed this occassionally or is this a portent of worse things to come?

400-ascona · Feb 23rd, 2011, 12:09

I know my brother had this issue once. I think he decided that it was as a result of wheel spin, the cruise control then locked itself out? Not sure if this is true or possible. The problem went away again when he turned off and back on again.

Rossi-fan · Feb 23rd, 2011, 12:11

The cruise control on my '00 V70 packed up. No faults showed up, and it did baffle the Volvo trained technician a bit. I never did get it sorted, selling the car with the fault.

dwaine dibbley · Feb 23rd, 2011, 12:36

Mine does exactly the same thing, 99 times out of a hundred the cruise comes on, but every now and again the cruise won't activate.

Was told it may be an intermittent fault with the brake light switch, but the brake lights seem ok, and no error messages.

If anyone has any further suggestions, I too would be grateful.

Thanks

GJB · Feb 23rd, 2011, 13:25

Had this problem turned out to be the switch on steering wheel (cruise on and off) catching as you switched on if not noticed the cruise control will not work even if you notice it has stuck until the next time you switch the ignition off and then on again.
(Hope this has made sense)

CherokeeDriver · Feb 23rd, 2011, 14:27

On an old BMW of mine this happened when the ABS sensor started to "wearout". It was fine for ABS and traction control, hence no codes, but wouldn't keep the car at a constant speed. It may be worth swapping some sensors about if anyone knows which wheel is used for cruise control.

chb · Feb 23rd, 2011, 22:05

I had this in the very cold weather in november/december. Not had it before or since. Again, it was VERY intermittent. I would tend to believe it was the cruise being de-activated by the car for some reason. No fault code ever came up.

dd1898 · Feb 23rd, 2011, 22:38

My cruise control stopped functioning and with mine being a manual transmission the problem was the cruise control switch connected to the clutch pedal had worn out.

There is a write up on volvoforums on how to check it. Basically if you have a manual trans you remove the switch from your clutch pedal(bit awkward as it is on the underside of the dash by the pedals, mine was white with a green connector) and insert a 2000ohm resistor(could be 2500ohm) into the pin connector, if your cruise display comes up then the switch is faulty. Do not drive with the resistors in position
A new one is around £40.

The reason for the sensor being on the clutch pedal is so that it disengages the cruise once the pedal is pressed. Do not drive with the resistors in the connector as the cruise will not switch off.
I am sorry if I am teaching my granny here. Hope this helps.

dd1898 · Feb 23rd, 2011, 22:59

Aha I found it. It was in the S60/80 area. Did not know how to link it so please check the following out.

Hi, this is my first posting, apologies for the length but I thought this might be useful. My car is a 2003 S60 D5 which I'm very pleased with.

Recently I got an Engine Service Required (ESR) message on the DIM and the Cruise had stopped working. I suspected the clutch switch as this was a fault that had been fixed by the dealer when I bought the car some weeks before.

After reading the forums here and doing a bit of investigating, I realised that there was a very small 'weep' of fluid from the clutch master cylinder onto the switch. I also found that if I started the engine with my foot on the clutch the ESR message didn't come on. If I slowly raised the clutch the message came on just before the end of the clutch travel and the Cruise wouldn't engage - see v8disco posting at http://www.volvoforums.org.uk/showth...+switch+cruise In my case there was a tiny amount of brake fluid on the switch but nothing major. I cleaned everything out but it still didn't solve the problem. Note it is quite easy to separate the two parts of the switch to get at the inside.

The swith itself is a carbon track variable resistor which measured a resistance of about 325 Ohm when the clutch pedal is down and about 3000 ohm when up. I reckoned that if I could lower the resistance to say 2000 ohm when the pedal was up then I should be in business again. All I had to do was solder a resistor across the two stiff wires that feed the connector for the wiring loom.

Here's where it gets a little technical, using Ohms Law (1/R = 1/R1 + 1/R2) I calculated that an 8200 (8K2) resistance would get the desire result (actually gives me ~2200 Ohm). I nipped down to my local Maplin store and bought an 8K2 ohm 0.6W metal film resistor for 15p (top left p785 on their online catalogue)

I soldered the resistor across the two wires put everything back together and everything works, no DIM message and cruise operates perfectly - the cruise drops out instantly I press the clutch or brake pedal.

I am well pleased with myself.

Hope this may be of some help to others.

grass hopper · Feb 23rd, 2011, 23:38

also there is a brake position sensor in the servo that can fail and cause this problem,worth checking the fault codes.

Feb 23rd, 2011, 11:42	#1
bobdabuilda Premier Member Last Online: May 31st, 2022 11:32 Join Date: Nov 2009 Location: south	Cruise control intermittent fault It's the first time I have noticed this but yesterday whilst driving the cruise control button wouldn't turn on the function at all. After stopping and turning off the ignition and then turning it back on the cruise control function worked fine again. Has anyone else noticed this occassionally or is this a portent of worse things to come?

Feb 23rd, 2011, 12:09	#2
400-ascona Premier Member Last Online: Apr 19th, 2024 10:05 Join Date: Mar 2008 Location: Derby	I know my brother had this issue once. I think he decided that it was as a result of wheel spin, the cruise control then locked itself out? Not sure if this is true or possible. The problem went away again when he turned off and back on again. __________________ 1997 V70R AWD, Saffron, Manual; Lotus Carlton; Ascona 400; Mini Cooper S Works; 4.2 Supercharged Range Rover; Land Rover Discovery 4; Suzuki GSF1200N; BMW R80/7; Velocette Venom; Daimler V8 250.

Feb 23rd, 2011, 12:11	#3
Rossi-fan Premier Member Last Online: Feb 12th, 2023 10:07 Join Date: May 2009 Location: Durham	The cruise control on my '00 V70 packed up. No faults showed up, and it did baffle the Volvo trained technician a bit. I never did get it sorted, selling the car with the fault. Last edited by Rossi-fan; Feb 23rd, 2011 at 12:18.

Feb 23rd, 2011, 23:38	#10
grass hopper Premier Member Last Online: Mar 18th, 2011 13:38 Join Date: May 2009 Location: grassmere!	also there is a brake position sensor in the servo that can fail and cause this problem,worth checking the fault codes. __________________

Feb 23rd, 2011, 12:36	#4
dwaine dibbley Junior Member Last Online: Apr 24th, 2024 18:50 Join Date: Feb 2008 Location: warrington	Mine does exactly the same thing, 99 times out of a hundred the cruise comes on, but every now and again the cruise won't activate. Was told it may be an intermittent fault with the brake light switch, but the brake lights seem ok, and no error messages. If anyone has any further suggestions, I too would be grateful. Thanks

Feb 23rd, 2011, 13:25	#5
GJB Premier Member Last Online: Apr 22nd, 2024 15:54 Join Date: Dec 2004 Location: Cromer Norfolk	Had this problem turned out to be the switch on steering wheel (cruise on and off) catching as you switched on if not noticed the cruise control will not work even if you notice it has stuck until the next time you switch the ignition off and then on again. (Hope this has made sense)

Feb 23rd, 2011, 14:27	#6
CherokeeDriver Junior Member Last Online: Oct 20th, 2012 19:15 Join Date: Dec 2010 Location: London	On an old BMW of mine this happened when the ABS sensor started to "wearout". It was fine for ABS and traction control, hence no codes, but wouldn't keep the car at a constant speed. It may be worth swapping some sensors about if anyone knows which wheel is used for cruise control.

Feb 23rd, 2011, 22:05	#7
chb Master Member Last Online: Dec 22nd, 2023 10:53 Join Date: Dec 2006 Location: Leeds	I had this in the very cold weather in november/december. Not had it before or since. Again, it was VERY intermittent. I would tend to believe it was the cruise being de-activated by the car for some reason. No fault code ever came up.

Feb 23rd, 2011, 22:38	#8
dd1898 Member Last Online: Feb 17th, 2024 10:52 Join Date: Jul 2010 Location: Stockton on Tees	My cruise control stopped functioning and with mine being a manual transmission the problem was the cruise control switch connected to the clutch pedal had worn out. There is a write up on volvoforums on how to check it. Basically if you have a manual trans you remove the switch from your clutch pedal(bit awkward as it is on the underside of the dash by the pedals, mine was white with a green connector) and insert a 2000ohm resistor(could be 2500ohm) into the pin connector, if your cruise display comes up then the switch is faulty. Do not drive with the resistors in position A new one is around £40. The reason for the sensor being on the clutch pedal is so that it disengages the cruise once the pedal is pressed. Do not drive with the resistors in the connector as the cruise will not switch off. I am sorry if I am teaching my granny here. Hope this helps.

Feb 23rd, 2011, 22:59	#9
dd1898 Member Last Online: Feb 17th, 2024 10:52 Join Date: Jul 2010 Location: Stockton on Tees	Aha I found it. It was in the S60/80 area. Did not know how to link it so please check the following out. Hi, this is my first posting, apologies for the length but I thought this might be useful. My car is a 2003 S60 D5 which I'm very pleased with. Recently I got an Engine Service Required (ESR) message on the DIM and the Cruise had stopped working. I suspected the clutch switch as this was a fault that had been fixed by the dealer when I bought the car some weeks before. After reading the forums here and doing a bit of investigating, I realised that there was a very small 'weep' of fluid from the clutch master cylinder onto the switch. I also found that if I started the engine with my foot on the clutch the ESR message didn't come on. If I slowly raised the clutch the message came on just before the end of the clutch travel and the Cruise wouldn't engage - see v8disco posting at http://www.volvoforums.org.uk/showth...+switch+cruise In my case there was a tiny amount of brake fluid on the switch but nothing major. I cleaned everything out but it still didn't solve the problem. Note it is quite easy to separate the two parts of the switch to get at the inside. The swith itself is a carbon track variable resistor which measured a resistance of about 325 Ohm when the clutch pedal is down and about 3000 ohm when up. I reckoned that if I could lower the resistance to say 2000 ohm when the pedal was up then I should be in business again. All I had to do was solder a resistor across the two stiff wires that feed the connector for the wiring loom. Here's where it gets a little technical, using Ohms Law (1/R = 1/R1 + 1/R2) I calculated that an 8200 (8K2) resistance would get the desire result (actually gives me ~2200 Ohm). I nipped down to my local Maplin store and bought an 8K2 ohm 0.6W metal film resistor for 15p (top left p785 on their online catalogue) I soldered the resistor across the two wires put everything back together and everything works, no DIM message and cruise operates perfectly - the cruise drops out instantly I press the clutch or brake pedal. I am well pleased with myself. Hope this may be of some help to others.

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