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lohr500

Member Since: 14 Sep 2014
Location: Skipton
Posts: 1316

2013 Defender 110 Puma 2.2 XS CSW Santorini Black

Discovery 2 XYZ switch and no front electric windows. Help!

Hi all,

I hope there are a few knowledgeable folks out there who will have dabbled with Disco 2s as well as Defenders.

I'm tearing my hair out with a TD5 Disco 2 Auto we use at our sailing club for shunting round trailers.

Out of the blue the two flashing green transmission lights appeared on the dashboard and the gearbox went into limp mode. At the same time the front windows stopped working.

Nanocom threw up a P0705 Position sensor error which is usually associated with the XYZ sensor on the side of the gearbox. But apparently it can also be caused by chaffing of the wiring loom across the top of the gearbox.

Clearing the fault, resulted in it immediately returning.

So far we have :

Swapped the good XYZ sensor from our other Disco 2. It made no difference. The one off the faulty Disco, worked perfectly on the donor Disco so we have ruled out the sensor itself.

Checked the wiring loom on top of the gearbox for any chafing, which there isn't and also checked for continuity on all the wires from the XYZ sensor and the other transmission wires running through the loom back to the connector blocks under the centre console. All have good continuity.

Swapped the gearbox ECU off the good Disco onto the poorly one. It made no difference and the one off the poorly one works fine on the good one.

When trying both front front windows there are no relay clicking sounds coming from the BCU module. Both windows worked correctly before the green flashing transmission warning lights appeared.

Checked the battery voltage and ran a direct earth from the battery to the BCU and gearbox loom earthing points. Made no difference.

Could it be a faulty BCU or damage to the wiring somewhere between the centre console and the passenger footwell where the BCU is located?

Any other ideas?

Is it possible to swap out the BCU on a plug and play basis with a known fully functional one or would we need to use Nanocom to configure it? Thinking we could try the BCU off the working Disco.

The fact that the front windows are controlled by the BCU and also the XYX sensor is linked to the BCU makes me think the gearbox and electric window faults are not coincidental and must be related.

I've googled the topic to death and can't find any info on a combination of P0705 fault codes and dead front electric windows.

Any pointers would be much appreciated!!!!!!
Thanks

21st May 2024 7:18pm

Lodelaner

Member Since: 04 Feb 2010
Location: Lambourn
Posts: 631

1988 Defender 90 V8 Petrol ST Shire Blue

NO words of advice, but I can sympathise - our D2 has the flashing M&S lights with no apparent solution. We simply turn to off and back on again and it clears. Very frustrating! JB

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Youtube greenlaning and other LR related content

23rd May 2024 6:28pm

lohr500

Member Since: 14 Sep 2014
Location: Skipton
Posts: 1316

Picked up some ideas over the past day or so from Landy Forum.

It does sound like the BCU module could be failing, but before swapping over the BCU from the other Disco (which involves some re-coding using Nanocom), we are going to check the fuse box and relays feeding the BCU first.

Won't be tinkering again until Wednesday next week, but fingers crossed!!

23rd May 2024 6:38pm

lohr500

Member Since: 14 Sep 2014
Location: Skipton
Posts: 1316

Well after major surgery and a lot of head scratching, it turned out to be a faulty relay on the passenger compartment fuse box.

Moral of the story. Check the easy things first and don't take Nanocom at face value

At least if the XYZ switch needs replacing in the future it will now be easy to get to

Click image to enlarge

29th May 2024 5:17pm

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