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DISCO3.CO.UK > Maintenance & Mods (D3)

P0578 Cruise Control Multi-Function Input 'A' Circuit Stuck
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Disco Matt
 


Member Since: 08 Nov 2013
Location: St Albans, Herts
Posts: 26

United Kingdom 2005 Discovery 3 TDV6 SE Auto Java BlackDiscovery 3
P0578 Cruise Control Multi-Function Input 'A' Circuit Stuck

I've tried all the normal suggestions:

1) Replaced rotary coupling
2) Replaced Steering wheel switches
3) Replaced Brake Light Swith
4) Check continuity on steering wheel loom

Now at a complete loss. Big Cry 2005 D3 SE Auto
EGR blanked/removed
20" Stormers
Not So large bank balance.  
Post #164639726th Apr 2016 4:44 pm
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Disco_Mikey
 


Member Since: 29 May 2007
Location: Dundee, Scotland
Posts: 20731

Scotland 2005 Discovery 3 TDV6 HSE Auto Cairns BlueDiscovery 3

Replace the steering wheel loom Thumbs Up

EDIT: Assuming the parts replaced are new, or known good parts My D3 Build Thread

TDV8 Retrofit Build Thread  
Post #164653626th Apr 2016 9:34 pm
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Disco Matt
 


Member Since: 08 Nov 2013
Location: St Albans, Herts
Posts: 26

United Kingdom 2005 Discovery 3 TDV6 SE Auto Java BlackDiscovery 3

The steering wheel switch was used, in 'full working order', so does still raise a doubt. Any way to test it other than with a known working switch? 2005 D3 SE Auto
EGR blanked/removed
20" Stormers
Not So large bank balance.  
Post #164663127th Apr 2016 7:29 am
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Disco_Mikey
 


Member Since: 29 May 2007
Location: Dundee, Scotland
Posts: 20731

Scotland 2005 Discovery 3 TDV6 HSE Auto Cairns BlueDiscovery 3

I can count on 1 finger the amount of faulty switchpacks

Wiring looms on the other hand Whistle Thumbs Up My D3 Build Thread

TDV8 Retrofit Build Thread  
Post #164665427th Apr 2016 8:30 am
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Robbie
 


Member Since: 05 Feb 2006
Location: ¯\_(ツ)_/¯
Posts: 17932

United Kingdom 2013 Discovery 4 3.0 SDV6 HSE Auto Baltic BlueDiscovery 4

Also check for corrosion at the PCM contacts - this is located behind the battery so the battery has to come out to gain access to the little plastic housing it lives in. Land Rover - Turning Drivers into Mechanics Since 1948

Battery & Quiescent Current Drain Testing

Diagnostics for:
Defender, FL2, D3, D4, Evoque, RRS & FFRR
A not-for-profit enterprise

  
Post #164669727th Apr 2016 9:35 am
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Disco Matt
 


Member Since: 08 Nov 2013
Location: St Albans, Herts
Posts: 26

United Kingdom 2005 Discovery 3 TDV6 SE Auto Java BlackDiscovery 3

Disco_Mikey wrote:
I can count on 1 finger the amount of faulty switchpacks

Wiring looms on the other hand Whistle Thumbs Up


I will bow to your far superior experience. Bow down

Nothing to loose. Thanks. 2005 D3 SE Auto
EGR blanked/removed
20" Stormers
Not So large bank balance.  
Post #164672827th Apr 2016 10:31 am
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Disco Matt
 


Member Since: 08 Nov 2013
Location: St Albans, Herts
Posts: 26

United Kingdom 2005 Discovery 3 TDV6 SE Auto Java BlackDiscovery 3

Robbie wrote:
Also check for corrosion at the PCM contacts - this is located behind the battery so the battery has to come out to gain access to the little plastic housing it lives in.


All suggestions gratefully accepted. Nothing to loose taking a look here too. 2005 D3 SE Auto
EGR blanked/removed
20" Stormers
Not So large bank balance.  
Post #164672927th Apr 2016 10:33 am
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trailhound
 


Member Since: 27 Aug 2015
Location: Colchester
Posts: 697

United Kingdom 2006 Discovery 3 TDV6 HSE Auto Bonatti GreyDiscovery 3

I have this fault logged and occasionally cruise control wont initiate. Is the loom the best starting point?
part no QTV500020 about £30?
Is it fiddly to do? (I'm sure I'll find a guide on here later).  
Post #18647094th Oct 2017 2:45 pm
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Narpy
 


Member Since: 18 Jul 2011
Location: Stockport
Posts: 7830

2005 Discovery 3 TDV6 S Manual Cairns BlueDiscovery 3

Try this thread trailhound:?https://www.disco3.co.uk/forum/topic138758.html and yes, the loom is the best starting place. Thumbs Up Mods:
Front Fogs + Halos
FBH Remote Control
The 1st Ever RRS Modded Grill
Garmin Nuvi + D4 Surround + Reversing Camera.
D4 Steering Wheel.
Rear Boot Spoiler.
Twin Brake Lights.
Wing Mirror Indicator Repeaters.
Long Roof Rails
Make your own Narpy grill thread
I'm not scared, I'm outta here.  
Post #18647104th Oct 2017 2:54 pm
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Alphamale
 


Member Since: 28 May 2014
Location: Belfast
Posts: 496

United Kingdom 2014 Discovery 4 3.0 SDV6 HSE Auto Loire BlueDiscovery 4

Don't forget to check the fuse, could be as simple as that, could it?   
Post #18648974th Oct 2017 9:45 pm
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trainmanone
 


Member Since: 19 Dec 2014
Location: stockport
Posts: 366

United Kingdom 2006 Discovery 3 TDV6 HSE Auto Zermatt SilverDiscovery 3

I had the problem where the switch wouldn't work cruse control or iid. took switch off striped it down used some contact cleaner on it works a treat now  
Post #18649014th Oct 2017 9:51 pm
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eightfoot
 


Member Since: 12 Apr 2015
Location: sunny essex
Posts: 762

United Kingdom 2005 Discovery 3 TDV6 S Auto Bonatti GreyDiscovery 3
Re: P0578 Cruise Control Multi-Function Input 'A' Circuit Stuck

Disco Matt wrote:
I've tried all the normal suggestions:

1) Replaced rotary coupling
2) Replaced Steering wheel switches
3) Replaced Brake Light Swith
4) Check continuity on steering wheel loom

Now at a complete loss. Big Cry


mine does this every now and then,the switches always work my iid so its not that causing it,a hard reset (batt cables shorted together) always fixes it
I did a reset last weekend as the cruise hasn't worked for about a year (not bothered) car allways ran fine with the fault code,cruise working now again car drives the same as ever just another d3 thing don't worry about it please excuse any grammer/punctuation mistakes,i'm thick,thankyou
current vehicles 2005 d3 2013 d4  
Post #18652125th Oct 2017 5:56 pm
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