Low voltage problem

woodstock1964 · Jun 2, 2023

Hi guys,
Land Rover, Range Rover vogue 2005 3.0
having been chasing faults all over the vehicle
windscreen wipers
radio
dashboard indicator repeaters
brake lights stuck on
constant "P" light
I ran diagnostics and the only consistent fault is a auxiliary fuse error on the body control module, I checked all the fuses and they are all good I even took the entire fuse box out and checked for corrosion (yes I had the sunroof drain issue, now all cured)
all relays check out, so I started measuring voltages....
the dreaded fuse 41 is only measuring 4.1v !
I jumped a 12v to the switched power in on the radio and sure enough that sprung to life,
has anybody else come across this?
I am loathsome to just chuck another input to fuse 41 until I can find out why this (and a few other fuses) have this low voltage issue
any body got any ideas
on further investigation fuse 53 which is on the head of this line is showing 12v but everything south of the ignition switch is showing 4v
is this a swap out ignition switch?

backinblack · Jun 2, 2023

What voltage do you have on the battery? you want at least 12.6v

Datatek · Jun 3, 2023

woodstock1964 said:
Hi guys,
Land Rover, Range Rover vogue 2005 3.0
having been chasing faults all over the vehicle
windscreen wipers
radio
dashboard indicator repeaters
brake lights stuck on
constant "P" light
I ran diagnostics and the only consistent fault is a auxiliary fuse error on the body control module, I checked all the fuses and they are all good I even took the entire fuse box out and checked for corrosion (yes I had the sunroof drain issue, now all cured)
all relays check out, so I started measuring voltages....
the dreaded fuse 41 is only measuring 4.1v !
I jumped a 12v to the switched power in on the radio and sure enough that sprung to life,
has anybody else come across this?
I am loathsome to just chuck another input to fuse 41 until I can find out why this (and a few other fuses) have this low voltage issue
any body got any ideas
on further investigation fuse 53 which is on the head of this line is showing 12v but everything south of the ignition switch is showing 4v
is this a swap out ignition switch?

Duff ignition switch is common.

woodstock1964 · Jun 3, 2023

backinblack said:
What voltage do you have on the battery? you want at least 12.6v

voltage is good on battery and most of the rest of the car, 12.8v standing and 13.8v with engine running

Datatek said:
Duff ignition switch is common.

looks very much that way, can't be all that hard to swap out (optimistic as always)

woodstock1964 · Jun 5, 2023

ignition barrel removed split and tested, pins 2 and 6 show perfect connection on both position 1 and position 2.....the search continues.

Mark Piercy · Jun 5, 2023

woodstock1964 said:
ignition barrel removed split and tested, pins 2 and 6 show perfect connection on both position 1 and position 2.....the search continues.

Also check the plug connector to it.

Datatek · Jun 6, 2023

woodstock1964 said:
ignition barrel removed split and tested, pins 2 and 6 show perfect connection on both position 1 and position 2.....the search continues.

Is that with a DVM? A DVM imposes no load on the switch so it may be misleading, failure may only occur under load.

mystery · Jun 8, 2023

not sure if this covers your year but may help

woodstock1964 · Jun 13, 2023

SUCCESS!!!
many thanks for your input, whilst the ignition switch was performing correctly my attention turned to the connector (many thanks to Mark Piercy) with the help of a torch I checked the connectors and they were quite corroded, small brass brush and managed to return them to copper colour and then finished with contact spray. checked and sure enough voltage to the offending set of fuses was restored. there was a few niggles with the contacts pushing themselves out of the connector block on reconnection but a small blunt object to the rear of the connector ensured they were all snapped in place..
ran diagnostics (icarsoft LR V2) and I now have a Range Rover in full working order with no faults
Many thanks to you all

brianp38dse · Jun 13, 2023

Nice one and thanks for posting the fix it will help others in the future

woodstock1964 · Jun 13, 2023

brianp38dse said:
Nice one and thanks for posting the fix it will help others in the future

I firmly believe that the entire problem started with the sunroof drain leaks, these will be on my regular check-list from now on

nevillen · Jun 13, 2023

I wish mine was just the sunroof drain leak, just received replacement passenger door electric window switch which I am going to fit tomorrow, if that doesn't solve my problem I will then put in a replacement regulator, if that doesn't work I am going to lock myself in a dark room!

Low voltage problem

woodstock1964

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backinblack

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Datatek

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woodstock1964

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Mark Piercy

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mystery

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