Cruise Control "Resume" button not working

Garethsd1 · 1st August 2022, 12:30

Hello everyone,

I have an Automatic 75 that's had little use since Boris told us all to stay at home.

The cruise control works absolutely fine, but the RES button has now suddenly stopped working. To "slow down", if I'm catching up with the car in front, I now need to dab the brakes to dis-engage the cruise. Likewise, to return to cruise mode, I need to press the SET button and then tap a few times to build up former speed, rather than use RES to return back to the speed I was doing a few moments earlier.

Is the RES button fused, or is there a brake pedal switch I need to check at all? As I say, the system is otherwise working fine.

Thanks in advance for any help!

Lee T · 1st August 2022, 12:56

Resume is the function that requires T4 after a retrofit I believe. So the first thing you could try is a 30min battery reset, or the often successful Scandinavian reset.
Remove both neg and pos battery leads, then away from the battery hold the leads together for 30 seconds to a minute. Wait half hour before reconnecting. Has solved many odd issues and is free. Good luck.

Garethsd1 · 1st August 2022, 13:03

The cruise is original factory fit (Connie SE). I'll disconnect the battery now, leave it overnight and take it for a test spin in the morning.

The "Scandinavian Reset" is a new one on me..!

ceetdm · 1st August 2022, 19:02

Of course it could just be the RES button contacts have become tarnished, I don't know how easy it is to get in with some switch cleaner?

roverbarmy · 1st August 2022, 19:25

Spray contact cleaner into and around the switch ( a plastic straw attachment helps if it has one) and move the switch up and down several times(maybe quite a lot actually!). I've done this several times on various vehicles and it has worked (sometimes after waiting overnight). I don't know if you are a smoker but cigarette ash kills switch contacts.

Garethsd1 · 3rd August 2022, 10:30

The battery reset hasn't worked (I'm not going to do the "Scandanavian Reset" as I also have an LPG system and I've no idea whether that would clear the LPG ECU or not)

I think I have some electrical contact cleaner somewhere. I'll have a rummage and report back.

1st August 2022, 12:30	#1
Garethsd1 Regular poster 2003 Rover 75 Connoisseur SE Auto Join Date: Mar 2010 Location: Wantage Posts: 85 Thanks: 10 Thanked 1 Time in 1 Post	Cruise Control "Resume" button not working Hello everyone, I have an Automatic 75 that's had little use since Boris told us all to stay at home. The cruise control works absolutely fine, but the RES button has now suddenly stopped working. To "slow down", if I'm catching up with the car in front, I now need to dab the brakes to dis-engage the cruise. Likewise, to return to cruise mode, I need to press the SET button and then tap a few times to build up former speed, rather than use RES to return back to the speed I was doing a few moments earlier. Is the RES button fused, or is there a brake pedal switch I need to check at all? As I say, the system is otherwise working fine. Thanks in advance for any help! __________________ Gareth Hopkins 1982 Rover SD1 3500SE 2003 Rover 75 Connoisseur SE auto (2 litre V6) Both cars running on LPG (autogas)

1st August 2022, 12:56	#2
Lee T Gets stuck in MG ZT Join Date: Jul 2014 Location: Liverpool Posts: 851 Thanks: 180 Thanked 248 Times in 189 Posts	Resume is the function that requires T4 after a retrofit I believe. So the first thing you could try is a 30min battery reset, or the often successful Scandinavian reset. Remove both neg and pos battery leads, then away from the battery hold the leads together for 30 seconds to a minute. Wait half hour before reconnecting. Has solved many odd issues and is free. Good luck. __________________ [SIGPIC][/SIGPIC]

1st August 2022, 13:03	#3
Garethsd1 Regular poster 2003 Rover 75 Connoisseur SE Auto Join Date: Mar 2010 Location: Wantage Posts: 85 Thanks: 10 Thanked 1 Time in 1 Post	The cruise is original factory fit (Connie SE). I'll disconnect the battery now, leave it overnight and take it for a test spin in the morning. The "Scandinavian Reset" is a new one on me..! __________________ Gareth Hopkins 1982 Rover SD1 3500SE 2003 Rover 75 Connoisseur SE auto (2 litre V6) Both cars running on LPG (autogas)

1st August 2022, 19:02	#4
ceetdm Loves to post Rover 75 CDTi Manual Saloon + Rover 75 CDTi Auto Saloon Join Date: May 2007 Location: Edinburgh Posts: 417 Thanks: 170 Thanked 42 Times in 33 Posts	Of course it could just be the RES button contacts have become tarnished, I don't know how easy it is to get in with some switch cleaner? __________________ Rover 75 Saloon CDTi Contemporary SE +pack

1st August 2022, 19:25	#5
roverbarmy This is my second home Roverless + 1.7D Sportage Join Date: Aug 2014 Location: East Norfolk Posts: 7,050 Thanks: 729 Thanked 2,021 Times in 1,449 Posts	Spray contact cleaner into and around the switch ( a plastic straw attachment helps if it has one) and move the switch up and down several times(maybe quite a lot actually!). I've done this several times on various vehicles and it has worked (sometimes after waiting overnight). I don't know if you are a smoker but cigarette ash kills switch contacts. __________________ Oil in my veins!

3rd August 2022, 10:30	#6
Garethsd1 Regular poster 2003 Rover 75 Connoisseur SE Auto Join Date: Mar 2010 Location: Wantage Posts: 85 Thanks: 10 Thanked 1 Time in 1 Post	The battery reset hasn't worked (I'm not going to do the "Scandanavian Reset" as I also have an LPG system and I've no idea whether that would clear the LPG ECU or not) I think I have some electrical contact cleaner somewhere. I'll have a rummage and report back. __________________ Gareth Hopkins 1982 Rover SD1 3500SE 2003 Rover 75 Connoisseur SE auto (2 litre V6) Both cars running on LPG (autogas)