Member Since: 22 Sep 2010
Location: Notts.
Posts: 8121
Electrics half dead after waxoil treatment.
Gave the D4 its biannual coat of wax oil with pressure spray gun and lost all fuel gauge reading, nothing showing so I left Ctec charger on overnight, it unlocked OK following morning but now it will not switch on, nothing happens when I press the start button totally dead.
Any advice on what to do next would be greatly appreciated.It can when others can't,
It will when others won't,
It goes where others don't.
16th Apr 2024 2:38 pm
PROFSR G
Member Since: 06 Mar 2017
Location: Lost
Posts: 4677
Do you know what the battery voltage is?yµ (idµ - eAµ) ψ=mψ
16th Apr 2024 3:12 pm
M3DPO
Member Since: 22 Sep 2010
Location: Notts.
Posts: 8121
13.05 volts at battery, 13.5 volts with Ctec connected and saying fully charged, Iid tool says no faults and ign off.
Doors have unlocked OK, hooter and seats works but nothing else.
Thanks for your response.It can when others can't,
It will when others won't,
It goes where others don't.
16th Apr 2024 5:16 pm
PROFSR G
Member Since: 06 Mar 2017
Location: Lost
Posts: 4677
I suppose there's no codes logged for any modules because the engine hasn't cycled! What about the earth straps, particularly the one on the front right chassis behind the wheel arch to the engine mount?
Have you "pending faults" selected in GAP? I suppose it would be no harm to check the fuses if you haven't already.yµ (idµ - eAµ) ψ=mψ
16th Apr 2024 5:43 pm
M3DPO
Member Since: 22 Sep 2010
Location: Notts.
Posts: 8121
Thanks for the reply.
I have checked all the small fuses but not the large square ones as I don't know which terminal is in or out but I have tried swapping them round like for like.
I have done a continuity test on the earth to engine, also connected a jump lead to the starter sns earth on battery.
No faults on the Iid tool.
Everything is dead but I can lock the car up. voltage has now dropped to 12.59 without the charger connected and the satnav screen has lit up with the message "start engine or system will shut down" It can when others can't,
It will when others won't,
It goes where others don't.
16th Apr 2024 7:22 pm
itsaguything
Member Since: 20 Dec 2023
Location: Manotick, On
Posts: 151
I pressure wash the b#$@&*( out of it. that includes inside the engine compartment.
You already know what I’m thinking…. grounding points or water ingress to the mains or that mega fuse thingy.
Lets start with, the water needs to be displaced, ie chased out of all the electric junction points you may have hit with the pressure gun.
(just had to say it out loud. sorry)2015 LR4 HSE Lux Aintree Green
2013 LR2 HSE Radiance Red
2007 XKR Jaguar Racing Green
2005 XJR Jaguar Racing Green
2002 S-Type R British Racing Green
16th Apr 2024 7:35 pm
PROFSR G
Member Since: 06 Mar 2017
Location: Lost
Posts: 4677
M3DPO wrote:
Thanks for the reply.
I have checked all the small fuses but not the large square ones as I don't know which terminal is in or out but I have tried swapping them round like for like.
I have done a continuity test on the earth to engine, also connected a jump lead to the starter sns earth on battery.
Try a different configuration of the earth jump! Do you have a spare brake light switch?yµ (idµ - eAµ) ψ=mψ
16th Apr 2024 7:46 pm
Sylvester19
Member Since: 18 Jul 2020
Location: Central Scotland
Posts: 114
itsaguything wrote:
I pressure wash the b#$@&*( out of it. that includes inside the engine compartment.
You already know what I’m thinking…. grounding points or water ingress to the mains or that mega fuse thingy.
Lets start with, the water needs to be displaced, ie chased out of all the electric junction points you may have hit with the pressure gun.
(just had to say it out loud. sorry)
Spraying waxoil, that's probably caused the issue, not water.
Just like water gets in the connectors, maybe waxoil has crept in somewhere, trouble is, could be any connector. Great if it was brake switch or earth! Not the dreaded fuel gauge connectors coated in waxoil causing it?
16th Apr 2024 11:32 pm
M3DPO
Member Since: 22 Sep 2010
Location: Notts.
Posts: 8121
itsaguything wrote:
I pressure wash the b#$@&*( out of it. that includes inside the engine compartment.
You already know what I’m thinking…. grounding points or water ingress to the mains or that mega fuse thingy.
Lets start with, the water needs to be displaced, ie chased out of all the electric junction points you may have hit with the pressure gun.
(just had to say it out loud. sorry)
I have only sprayed the underside not under the bonnet!It can when others can't,
It will when others won't,
It goes where others don't.
17th Apr 2024 10:54 am
M3DPO
Member Since: 22 Sep 2010
Location: Notts.
Posts: 8121
PROFSR G wrote:
M3DPO wrote:
Thanks for the reply.
I have checked all the small fuses but not the large square ones as I don't know which terminal is in or out but I have tried swapping them round like for like.
I have done a continuity test on the earth to engine, also connected a jump lead to the starter and earth on battery.
Try a different configuration of the earth jump! Do you have a spare brake light switch?
As the car is still on ramps at the rear it is difficult to check the earth thoroughly but I will have another go today.
If the engine earth strap has failed would anything else work?- the car locks and some interior lights come on and I’ve had a faint low battery warning on the dash on for instance, not forgetting the first fault was the fuel gauge failed.It can when others can't,
It will when others won't,
It goes where others don't.
17th Apr 2024 11:07 am
itsaguything
Member Since: 20 Dec 2023
Location: Manotick, On
Posts: 151
Apologies, I should have used “conductive dampness” as opposed to “water”.
The good news, there are some electrics coming up. If the battery registers below 12.4v, that could be part of the issue right there.
And if you are not blowing fuses, thats good news too.
The electrical guide shows all grounding points. Do you have a copy? If not PM me.
Cheers2015 LR4 HSE Lux Aintree Green
2013 LR2 HSE Radiance Red
2007 XKR Jaguar Racing Green
2005 XJR Jaguar Racing Green
2002 S-Type R British Racing Green
17th Apr 2024 11:32 am
PROFSR G
Member Since: 06 Mar 2017
Location: Lost
Posts: 4677
M3DPO wrote:
If the engine earth strap has failed would anything else work?- the car locks and some interior lights come on and I’ve had a faint low battery warning on the dash on for instance, not forgetting the first fault was the fuel gauge failed.
Some systems will continue to function as they have their own earths, especially if their current draw is very low and the battery earth is good.
Take an earth jump from the engine or to the chassis and see if that changes anything. Do you have another brake light switch?yµ (idµ - eAµ) ψ=mψ
17th Apr 2024 1:44 pm
gstuart
Member Since: 21 Oct 2016
Location: kent
Posts: 13670
Hi mate
May I ask a daft question plse would a canbus test for both ohms and vdc at the obd2 socket be useful to identify if there are any errors in the modules
Many thks as always
17th Apr 2024 1:59 pm
M3DPO
Member Since: 22 Sep 2010
Location: Notts.
Posts: 8121
Iid tool is showing no faults.
PROFSR G: I don’t have a spare brake light switch, I gave it away
I’m still trying to access the earth cable! - although I have tried a jump lead without success. It can when others can't,
It will when others won't,
It goes where others don't.
Last edited by M3DPO on 17th Apr 2024 2:19 pm. Edited 3 times in total
17th Apr 2024 2:02 pm
PROFSR G
Member Since: 06 Mar 2017
Location: Lost
Posts: 4677
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