Mr - Cruise Control & ATC display problem

markcollett · 3rd January 2019, 17:19

Help please. I have retrofitted cruise control to 2004 diesel model but on reconnecting the battery there was a popping noise toward front right under bonnet. The cruise does nothing and worst of all I now have er code on both left and right temperature windows on climate control unit in dash. Also no heated rear window indicator light on climate unit when button pressed. I notice that the er code goes away if ignition switched off and on but reappears if I press the front demist followed by the rear demise. I’ve carefully checked all fuses and fused links under glovebox and under bonnet and removed the cruise wiring but still get ‘er’ messages on climate control unit. I am wondering if somehow I have blown the external temperature sensor. Does anyone have any ideas?

vitesse · 3rd January 2019, 17:51

Re-check the mega fuse by removing. MarinaBrian says it cannot be tested in circuit and he's usually right about these things.

Regards

COLVERT · 3rd January 2019, 18:56

WHEN YOU SAY mega fuse DO YOU MEAN THE LARGE LINK ON THE RIGHT UNDER THE BONNET ??

IF SO THERE SHOULD BE NO DASH LIGHTS AT ALL SHOULD THERE ??

Sorry. Had caps lock on. Lol.

trikey · 3rd January 2019, 19:05

Sounds like the canbus line has had a dose of 12v to me!

vitesse · 3rd January 2019, 19:15

Quote:

Originally Posted by COLVERT

WHEN YOU SAY mega fuse DO YOU MEAN THE LARGE LINK ON THE RIGHT UNDER THE BONNET ??

IF SO THERE SHOULD BE NO DASH LIGHTS AT ALL SHOULD THERE ??

Sorry. Had caps lock on. Lol.

The OP asked for ideas, this was mine remembering a post by MarinaBrian. https://www.the75andztclub.co.uk/for...d.php?t=266037

Regards

marinabrian · 3rd January 2019, 19:16

The diesel has no 150A megafuse fitted, it has a strap link fitted, and I suspect something is very broken, or the fuses haven't been all checked

A popping noise from the UBFB would point to a fusible link failure

trikey · 3rd January 2019, 19:16

My advice would be to disconnect the cruise and see if all returns to normal.

Did the car have the wiring harness present or did you make your own up?

3rd January 2019, 17:19	#1
markcollett Newbie rover 75 connoisseur 1.8t Join Date: Jul 2014 Location: Bexley Posts: 8 Thanks: 0 Thanked 0 Times in 0 Posts	Mr - Cruise Control & ATC display problem Help please. I have retrofitted cruise control to 2004 diesel model but on reconnecting the battery there was a popping noise toward front right under bonnet. The cruise does nothing and worst of all I now have er code on both left and right temperature windows on climate control unit in dash. Also no heated rear window indicator light on climate unit when button pressed. I notice that the er code goes away if ignition switched off and on but reappears if I press the front demist followed by the rear demise. I’ve carefully checked all fuses and fused links under glovebox and under bonnet and removed the cruise wiring but still get ‘er’ messages on climate control unit. I am wondering if somehow I have blown the external temperature sensor. Does anyone have any ideas? Last edited by Reebs; 3rd January 2019 at 22:10.. Reason: Thread title expanded to reflect the issue

3rd January 2019, 19:05	#4
trikey Premium Trader Rover 75 Join Date: Nov 2010 Location: Devon Posts: 33,773 Thanks: 8,837 Thanked 14,831 Times in 8,030 Posts	Sounds like the canbus line has had a dose of 12v to me! __________________ Lest we forget..

3rd January 2019, 19:16	#7
trikey Premium Trader Rover 75 Join Date: Nov 2010 Location: Devon Posts: 33,773 Thanks: 8,837 Thanked 14,831 Times in 8,030 Posts	My advice would be to disconnect the cruise and see if all returns to normal. Did the car have the wiring harness present or did you make your own up? __________________ Lest we forget..

3rd January 2019, 17:51	#2
vitesse I really should get out more....... Rover 75 Saloon Join Date: Jul 2011 Location: Gävle Posts: 2,537 Thanks: 395 Thanked 823 Times in 652 Posts	Re-check the mega fuse by removing. MarinaBrian says it cannot be tested in circuit and he's usually right about these things. Regards

3rd January 2019, 18:56	#3
COLVERT This is my second home R75 Saloon. Join Date: Feb 2009 Location: France/or Devon. Posts: 14,003 Thanks: 3,851 Thanked 2,167 Times in 1,816 Posts	WHEN YOU SAY mega fuse DO YOU MEAN THE LARGE LINK ON THE RIGHT UNDER THE BONNET ?? IF SO THERE SHOULD BE NO DASH LIGHTS AT ALL SHOULD THERE ?? Sorry. Had caps lock on. Lol.

3rd January 2019, 19:16	#6
marinabrian MG ZT Join Date: Jan 2011 Location: Newcastle Upon Tyne Posts: 20,151 Thanks: 3,565 Thanked 10,837 Times in 5,718 Posts	The diesel has no 150A megafuse fitted, it has a strap link fitted, and I suspect something is very broken, or the fuses haven't been all checked A popping noise from the UBFB would point to a fusible link failure