No cruise control or indicator

[Katamarano]

My mk7 based motorhome isn't lighting the cruise control light when the ignition is turned on, or when unsuccessfully attempting to use cruise control. Any ideas why?

Many thanks.

[Cider Andy]

First question: did it used to work and now it doesn't....?

[Katamarano]

First question: did it used to work and now it doesn't....?

Unknown, unfortunately.

[Cider Andy]

Does it have cruise control buttons on the steering wheel? ON/OFF on the left, SET/+, - and RESUME/= on the right.

If it doesn't have the buttons, it doesn't have cruise control.

If it does have the buttons, but the indicator doesn't light up during the ignition on self-test, the steering wheel may have been replaced.

There's no standalone cruise control ECU, it's a function of the Body Control Module (BCM), so it's unlikely it's an ECU failure.

For everything you need to check if the vehicle supports cruise control (as it's not available on all BCMs and not all the wiring is necessarily in place), check Vantuner's link here and Loot's guide here.

[Punto443]

I would estimate that if it doesn't light up on starting the vehicle then extinguish. But you have the buttons , then it will be one of the following?

1. Someone has fitted a cruise control steering wheel only and the vehicle has never had it.

2. The vehicle has had a bcm replacement and has not been correctly programmed.

3. Someone has been playing with the configuration settings and switched it off.

[Katamarano]

I would estimate that if it doesn't light up on starting the vehicle then extinguish. But you have the buttons , then it will be one of the following?

1. Someone has fitted a cruise control steering wheel only and the vehicle has never had it.

2. The vehicle has had a bcm replacement and has not been correctly programmed.

3. Someone has been playing with the configuration settings and switched it off.

Please tell me more about option 3!

[Katamarano]

Does it have cruise control buttons on the steering wheel? ON/OFF on the left, SET/+, - and RESUME/= on the right.

If it doesn't have the buttons, it doesn't have cruise control.

If it does have the buttons, but the indicator doesn't light up during the ignition on self-test, the steering wheel may have been replaced.

There's no standalone cruise control ECU, it's a function of the Body Control Module (BCM), so it's unlikely it's an ECU failure.

For everything you need to check if the vehicle supports cruise control (as it's not available on all BCMs and not all the wiring is necessarily in place), check Vantuner's link here and Loot's guide here.

So, I finally have found time for this job...

Yes, it does have the buttons on the steering wheel.

The BCM is a CC, so should support cruise.

The squib does have the two orange cruise control wires. The loom doesn't look modified.

A clue perhaps - the outside temperature always shows as - - on the dash. Might this be linked with the cruise control problem?

Thanks for your help so far!

[davyjcb]

Looks as if all the gubbins has been fitted but not enabled, have a look on the chassis leg drivers side in the wheel arch to see if the temperature sensor is fitted

[Katamarano]

Looks as if all the gubbins has been fitted but not enabled, have a look on the chassis leg drivers side in the wheel arch to see if the temperature sensor is fitted

Sensor is fitted and connected.

[davyjcb]

Saying that everything is fitted have you access to someone with the ability to pull up the module configuration ? You'd be looking for cruise being enabled and also dash should be level 2 or it won't recognize the temp. It would be advisable to have a look see at this first before you go knee deep in wires looking for a fault that's not there. If you had Forscan I believe that you can look for operation of all the cruise switches and as a result if there's no data on them the bcm is not set up to recognize the switch operatiins

[Katamarano]

Saying that everything is fitted have you access to someone with the ability to pull up the module configuration ? You'd be looking for cruise being enabled and also dash should be level 2 or it won't recognize the temp. It would be advisable to have a look see at this first before you go knee deep in wires looking for a fault that's not there. If you had Forscan I believe that you can look for operation of all the cruise switches and as a result if there's no data on them the bcm is not set up to recognize the switch operatiins

Somebody has offered to plug in a 'diagnostic unit' to tomorrow for £15 which will 'scan every control unit'. Do you think that would give me answers? I'm new to this inboard computer game!

[davyjcb]

Dependant on the reader used you could have a chance some readers have full functionality some don't , if your van is missing the necessary configuration files it won't generate a code . no reader will pick it up unless the vehicle knows it's supposed to be there and realizes it's got a fault then and only then it will be flagged . If the reader used can see what files are stored and enabled it's a simple yea or nay
If ids used you can see in plain text if it's there, an option will be visible to switch it on or off if not there will be the heading for it but you'll be able to do nothing with it , like wise for the ICU high level cocks will plug and play but will not support the temp . For ordinary dash it's level 1 clocks for high spec dash it's level 2
See how you get on and post your findings.
What locality are you in (roughly not your address) there might be a forum member with the kit to help you close there's a bunch of good people on here and willing to help

[Katamarano]

Dependant on the reader used you could have a chance some readers have full functionality some don't , if your van is missing the necessary configuration files it won't generate a code . no reader will pick it up unless the vehicle knows it's supposed to be there and realizes it's got a fault then and only then it will be flagged . If the reader used can see what files are stored and enabled it's a simple yea or nay
If ids used you can see in plain text if it's there, an option will be visible to switch it on or off if not there will be the heading for it but you'll be able to do nothing with it , like wise for the ICU high level cocks will plug and play but will not support the temp . For ordinary dash it's level 1 clocks for high spec dash it's level 2
See how you get on and post your findings.
What locality are you in (roughly not your address) there might be a forum member with the kit to help you close there's a bunch of good people on here and willing to help

I'm now trying to figure out the difference between IDS and Forscan, regarding adding cruise.

I'm in South Dorset.

[davyjcb]

I was describing the majority of generic readers , IDS & Forscan are in a league of their own for Ford's . There's nothing to touch them. Each has its own Pro's and con's but they are the go to systems.

[Katamarano]

I see! Well rather than paying this fellow £15, I've ordered a £22 OBD2 reader for Forscan, so I'll try that later and see what I see!

I'm still not quite clear though what I'll be able to do. I really don't understand why cruise and the temperature wouldn't be working.

The van was given a custom engine mapping before I bought it. Perhaps that somehow messed things up?