L322 Indicator Problem 2004 Vogue

We have a problem with the indicators on our Range Rover. The indicators all work fine for a while and then suddenly the indicators stop working as they should. The indicators still work but they flash very slowly and there are no indicator lights showing on the dash. If the headlights are on, the indicator failure is preceded by a flashing of the hazard switch accompanied by a clicking sound as it flashes. When the indicators have failed, the rear lights come on and stay on.
If I disconnect the battery, everything seems to reset and all works as it should. The failure of the indicators occurs more regularly in damp weather.
We have had the control module checked out (front driver side a pillar). It almost seems as though the flasher relay gets stuck and disconnecting and reconnecting the battery clears it.

Does anybody have any thoughts?

Steve

Think they have MOSFET (Grrr) in BECM instead of a relay?, sounds like damp may be the culprit. Try dehumidifying the cab especially around footwells/seats

shadow_scoob said:

We have a problem with the indicators on our Range Rover. The indicators all work fine for a while and then suddenly the indicators stop working as they should. The indicators still work but they flash very slowly and there are no indicator lights showing on the dash. If the headlights are on, the indicator failure is preceded by a flashing of the hazard switch accompanied by a clicking sound as it flashes. When the indicators have failed, the rear lights come on and stay on.
If I disconnect the battery, everything seems to reset and all works as it should. The failure of the indicators occurs more regularly in damp weather.
We have had the control module checked out (front driver side a pillar). It almost seems as though the flasher relay gets stuck and disconnecting and reconnecting the battery clears it.

Does anybody have any thoughts?

Steve

Click to expand...

There is no flasher relay, it's done electronically. It certainly sounds like damp in the cabin affecting the electronics,
Do you keep the aircon on? You should because it helps to keep the cabin dry.

RangeRoller dt said:

Think they have MOSFET (Grrr) in BECM instead of a relay?, sounds like damp may be the culprit. Try dehumidifying the cab especially around footwells/seats

Click to expand...

BECM is P38, this is an L322 which has an LCM for the lights which no doubt also uses MOSFETS.

Hi all

Thanks for all the feedback.

Just to add a little more detail, the only lights that are affected are the tail lights and the indicators. The headlights, front sidelights and brake lights all work as expected. I get no dimming of cabin lights. I had the LCM (mounted on the A pillar by the drivers leg) refurbished last spring and all through the summer everything worked fine: i thought the problem was solved.

This winter it has all started again. I know that I cannot assume that the refurbishing of the LCM has solved the problem but would that affect more than just the tail lights and indicators?

We do have aircon on all the time.

Sorry for my ignorance but what are MOSFETS? Are they serviceable, do they need to be replaced or does the module they are within need to be replaced?

Is there a fuse for tail lights/indicators?

What would be first choice to look at given these issues?

Sorry if my questions come across as naive. I have an auto electrician ready to go but he wants to see the problem which is intermittent and has happened less in the last couple of weeks - sods law!

Thanks
Steve

MOSFET's are high power transistors (electronic switches!) used for switching high powered circuits (similar to a relay, but with no mechanical moving parts!)

If the issue only affects the rear lamp clusters....I'd be looking at damp in the rear, or the connections to the LCM that control the rear clusters....the front lamps are all controlled similarly from the LCM, so if it was a circuit issue, or command issue, it would affect all lamps.

The LCM is notorious fro getting damp and going bandy.....and so are the rear quarters of the L322!

There could be something coming in affecting the LCM, and doing the LCM sorted it until the problem effected the new one also? - just a thought.

Have you checked to see if there is any damp/condensation in the boot well? Quite common

Look for damp in the back it is very common..

The L322 is packed to the roof with electronics and as we know Leccy stuff doesn't like water!!!

Been long time since I did anything with pcbs. Think MOSFET is MetalOxideSemiFieldEffectTransistor. Like a type of logic gate.

A posh relay not as easy to change

Has anyone read my post??

Yes, and the ones from a month ago

We've been struggling on without you, where you been - you okay?

Had similar with my faulty LCM. Rear lights came on when car started and only went out when you switched the light on and off. Indicators worked outside but not on dash.

There was guy other day had similar problem. Turned out to be couple cheap bulbs he fitted. Lucky to realise IMO - he was persuing new Gbox because it threw up fault due to crap bulbs

That was a wierd one.

Its in the title

https://www.landyzone.co.uk/land-rover/weirdest-problem-ever-can-anyone-help.344072/

RangeRoller dt said:

Yes, and the ones from a month ago

We've been struggling on without you, where you been - you okay?

Click to expand...

I'm OK, work is uber busy - I am working in a clients office in Wiltshire at the moment, so can't just pop in and out of the forum like I can when in my own office in Farnborough.....and I have about another 6 weeks to go on this piece of work I am doing for them.....

So driving 2 hours there and two hours back each day, limits my time with our young family, so trying to maximise that too.......

I'm glad your busy and okay.

Il just stay here and be a nuisance if that's okay? I'm learning slowly and the boys keep me in check

I had really weird light problems caused by LED bulbs fitted in number plate bulbs that had started to melt and burn the surrounding plastic. They caused every light fault warning to ping up on the dash except number plate bulb.
If you have any led bulbs anywhere or have aftermarket front or rear light clusters fitted check them as well by disconnecting one at a time or pulling any LED bulbs. If you don’t have any of the above then still a case of tracking offending circuit or LCM fault as already mentioned by all above.

Could be melted from your 10 exhaust tips

Ok, so I only have 10, big deal !