cruise control and hill start assist not working after Viper alarm removal - MINI Cooper Forum

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post #1 of 6 (permalink) Old Apr 7th, 2014, 10:07 AM Thread Starter
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cruise control and hill start assist not working after Viper alarm removal

I recently had a garage disconnect a Viper 5701 alarm system that was installed in my R55 fJCW Clubman (Dec '09) because it was found to be causing a high battery discharge rate. The garage have told me that they simply unplugged the power supply to the Viper system, and subsequently everything seemed to be working fine..

However, after receiving the car back, I have found that the Hill Start Assist no longer works when tested on an incline, and neither does the cruise control - specifically, I can turn the cruise control on, but if I then press the + or - buttons there is no response from the car.

There are no warning lights or messages that advise of any faults or errors. I am hoping that this is a simple fuse replacement since all the garage did was disconnect the third-party alarm system. I'm reluctant to return to the garage since they should really have tested the car after disconnecting the alarm.

Any thoughts on what the cause could be?
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post #2 of 6 (permalink) Old Apr 7th, 2014, 01:13 PM
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Originally Posted by sailesh View Post
I'm reluctant to return to the garage since they should really have tested the car after disconnecting the alarm.
They should have but did they? and why are you so reluctant to take it back if it was ok before they touched it??

Good idea? reinstate the alarm system and see if all returns to normal, easy if its just a case of re plugging it in as you say?
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post #3 of 6 (permalink) Old Apr 7th, 2014, 01:31 PM Thread Starter
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Originally Posted by The Nun View Post
They should have but did they? and why are you so reluctant to take it back if it was ok before they touched it??

Good idea? reinstate the alarm system and see if all returns to normal, easy if its just a case of re plugging it in as you say?
I assume most would be reluctant to waste more time with a garage that has already misdiagnosed their car (in relation to high battery drain) before rectifying the issue and not fully testing the car before returning it. The car was away from me for three days the first time, two days the second, and I don't know what else I could be tied into if I returned!

As to your suggestion, yes, it could potentially help regarding the cruise and HSA, but then I would still have the high battery drain issue which has just been resolved and paid for, and doesn't get me any closer to being able to disconnect the alarm without disabling cruise and HSA.

Last edited by sailesh; Apr 7th, 2014 at 06:02 PM.
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post #4 of 6 (permalink) Old Apr 8th, 2014, 01:06 AM
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Yes but it will get you closer to knowing whether the alarm is causing your problem or not. If after reconnecting your alarm your problem is still there you will know the problem is somewhere else.

In all fairness to the garage (and any garage really) I doubt they will test every single function of your car before returning it to you especially if the work is deemed unrelated to those functions.
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post #5 of 6 (permalink) Old Apr 8th, 2014, 09:00 AM Thread Starter
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@The Nun, @burnstar

Yeah, you're both right, and thanks for your help. It's always the problem with diagnosing third-party mods, especially electronic. The garage are quite sure that the viper system is more deeply connected than it first seem, hence the speed signal is not being sent to the cruise control and hill start control modules.
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post #6 of 6 (permalink) Old Apr 8th, 2014, 09:51 AM Thread Starter
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Taken from the Viper installation manual:

"VIOLET/WHITE Tachometer input
This input provides the module with information about the engine’s revolutions per minute (RPMs). It can be connected to the negative side of the coil in vehicles with conventional coils.
Note: This wire MUST be used when installing this unit on a manual transmission."

So, it may be that if I check the wiring of this feed to the Viper and restore it, things will go back to normal... if not I'm going to a professional uninstaller!

^^ see here for can of worms
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