Welcome to 911UK
The only place for Porsche, 911uk is the definitive enthusiast and resource site for the Porsche 911.
Registration is fast, simple and absolutely free, so join up today for full access to the site and benefit from latest member offers.

Porsche Classifieds
Porsche Buyers Guides
Sell Your Porsche on 911uk
Create a Free Classified Advert
Search Ads
Classified Adverts FAQ
Trade Classified Information
Buyer & Seller Fraud Protection
Pre Purchase Inspection (PPI)
Porsche Car Sourcing
Porsche Cars Wanted
Model
Stock
Porsche 911
991 : 2011- 7
997 : 2004- 75
996 : 1997-2005 42
993 : 1993-1998 8
964 : 1989-1993 0
Carrera 3.2 : 1983-1989 0
Carrera SC : 1977-1983 0
930 Turbo : 1975-1989 1
Early 911 : 1964-1977 1
Porsche Other Models
Classic : 1950-1965 1
Boxster : 1997- 11
Cayman : 2005- 21
Cayenne : 2003- 10
Macan : 2014- 2
Panamera : 2009- 1
912-914-924-928-944-968 4
959 - CarreraGT - RaceCar 0
Car Parts For Sale & Wanted
Other Items For Sale & Wanted
Wheels Tyres For Sale & Wanted
Number Plates For Sale Wanted

Porsche Services
Porsche Body Shop Repair
Paint Protection & Body Wrapping
Porsche Classic Insurance
Porsche Classic Parts
Porsche Classic Restoration
Porsche Design Collection
Porsche Engine Gearbox Rebuild
Porsche Heritage & History
Porsche News
Porsche Picture Gallery
Win a New Porsche 911

Porsche Parts
Body Parts, Body Styling
Brakes, Clearance
Electrical, Exhausts
Engine Cooling, Engine Electrical
Engine Rebuild, Heating Cooling
Interior Incar, Lighting
Rubber Seals, Service Parts
Steering, Suspension
Transmission, Workshop Tools
Early 911, 911 - 930, 928 - 968
964 - 993, 996 - 997, Boxster
Cayman, Cayenne, Panamera

Porsche Model Range
911 [991] 2011-Current
Porsche 911 [991]
911 [997] 2004-Current
Porsche 911 [997]
911 [GT] GT1-GT2-GT3
Porsche 911 [GT]
911 [996] 1997-2005
Porsche 911 [996]
911 [993] 1993-1998
Porsche 911 [993]
911 [RS] RS-RSR
Porsche 911 [RS]
911 [964] 1989-1993
Porsche 911 [964]
911 3.2 1983-1989
Porsche 911 3.2 Carrera
911 SC 1977-1983
Porsche 911 SC
911 [Early] 1964-1977
Porsche 911 [Early]
Boxster & Cayman
Porsche Boxster & Cayman
Cayenne & Panamera
Porsche Cayenne & Panamera

911uk Site Partners

Post new topic   Reply to topic
Author Message
A993LAD
Nürburgring


Joined: 20 Mar 2007
Posts: 445
Location: Cambs


PostPosted: Sat May 06, 2017 9:11 pm    Post subject: Under bonnet courtesy light Reply with quote

Im trying to trace a parasitic current draw on my battery which has suddenly started running down quickly if I leave the car parked for a few days .

I'm starting by testing the battery drain under the bonnet but just realised there is an under bonnet courtesy light which might be drawing current so I need to make sure it is switched off whilst I've got the Bonnet open .

But stupidly I can't find the switch anywhere. does anybody know where it is Please?
 
  
View user's profile Send private message Send e-mail
   
kerb scraper
Spa-Francorchamps


Joined: 25 May 2012
Posts: 343
Location: Hertfordshire

1997 Porsche 993 Carrera 4

PostPosted: Sat May 06, 2017 9:30 pm    Post subject: Reply with quote

Just click the latch over to the closed position using a screwdriver or similar.
_________________
1997 C4 Cabriolet, Arctic Silver, black interior, 18" hollow spokes, Bilstein PSS10s, RSRs, 200 cell cats, Mobil 1 sticker, LED to interior. Bergville t-lights.
 
  
View user's profile Send private message
   
HomersSpiceRack
Newbie


Joined: 02 Apr 2017
Posts: 16



PostPosted: Sat May 06, 2017 10:33 pm    Post subject: Reply with quote

Are you sure your battery is not on the way out especially if you have to turn off the light when the bonnet is open?

If the problem is irregular use of the car then I can recommend the battery isolator sold everywhere which is fitted to the negative terminal and consists of a wheel which you give a quick turn if and it isolated the battery. It can be fitted in minutes and is sold as an anti theft device.

Remember that unless your car is parked somewhere secure it also isolates the alarm unless you install the fused link which gives a trickle of power to the car.... thereby rendering the whole purpose redundant.
 
  
View user's profile Send private message
   
johne
Trainee


Joined: 07 Apr 2008
Posts: 86



PostPosted: Sun May 07, 2017 6:31 am    Post subject: under bonnet curtesy light Reply with quote

i take the bulb out .its only for the fuse box . I carry one of them cheap wind up torches in case of emergencies
 
  
View user's profile Send private message
   
ToreB
Approved Trader


Joined: 13 May 2010
Posts: 524
Location: Oslo, Norway


PostPosted: Sun May 07, 2017 7:43 am    Post subject: Reply with quote

The most probable cause for excessive current drain is failing door switches. These does not only activate the interior lights, but a relay or two as well as the alarm/door lock control module. Turning off the interior lights masks this problem.

Another common problem is a failing on/off transistor in the Climate Control Module. This can leave the unit on. (it is supposed to shut off in 20 minutes after ignition off) However, this is normally about 500mA due to the CCU fan. However, if the fan has failed you could get about 100mA. Pull Fuse 1 to test.
The tachometer OBC LCD backlight circuit can fail to shut off when car is locked, this is also a probable cause for this current rating. Fuse 12.

Be sure to measure the current with all interior/bonnet/engine lights off, lock the doors, and wait for the CCU to turn off. The light switch in the luggage and engine compartments are placed in the lock mechanism. Depresss the latch to switch off the light.
You might consider opening the windows first to avoid having problems getting in due to a problem with immobilizer or similar.
Normal current draw at ignition off is normally around 20-25mA. Depending on aftermarket equipment installed, (alarms/stereos etc) this can increase to 30-40mA.

Cheers,
Tore
_________________
'95 993 C4

Bergvill F/X
Porsche electronics specialists, products and repair services.
 
  
View user's profile Send private message Send e-mail Visit poster's website
   
AndyS
Barcelona


Joined: 25 Mar 2010
Posts: 1304
Location: The fast lane


PostPosted: Sun May 07, 2017 9:07 pm    Post subject: Reply with quote

As Kerb-Scraper suggested - just flick the catch when the bonnet is open, and pop a rag in it so you don't forget to release it.
However, I'm wondering if you actually meant "whilst I've got the Bonnet closed...."
If this is the case, you can tell when you lock the car, as the alarm will report a fault when you lock it, by flashing the door LED's twice per second instead of once per second if one of the interior, bonnet or engine lid light is still lit.
_________________
Andy
1996 Polar Silver 993 Coupe - AKA 'the money pit'
A Class AMG & Golf TDi for the daily

 
  
View user's profile Send private message
   
toddgibbs123
Newbie


Joined: 23 May 2015
Posts: 31
Location: Oxford, UK


PostPosted: Fri Jun 16, 2017 10:18 pm    Post subject: Reply with quote

Interesting post as I recently had the same issue.

I even went as far as to remove my speedo to see if the light is actually going out (which it wasn't!!). Even though it did go out when I used a screwdriver to fake the bonnet closing (I tried it numerous times as I couldn't see why it wasn't working)

Solution (as already suggested) : remove the bulb Smile

Todd
_________________
1979 Porsche 930 GP White --
1995 Porsche 993 C2 manual ++
 
  
View user's profile Send private message
   
BruceyBonus61
Trainee


Joined: 11 Oct 2010
Posts: 90
Location: Tunbridge Wells


PostPosted: Fri Jun 16, 2017 11:52 pm    Post subject: Reply with quote

As ToreB says

"Another common problem is a failing on/off transistor in the Climate Control Module. This can leave the unit on. (it is supposed to shut off in 20 minutes after ignition off) However, this is normally about 500mA due to the CCU fan. However, if the fan has failed you could get about 100mA. Pull Fuse 1 to test.
The tachometer OBC LCD backlight circuit can fail to shut off when car is locked, this is also a probable cause for this current rating. Fuse 12."


This is what happened to mine.

ATB
Bruce
_________________
PREVIOUSLY ENJOYED:1994, Polar Silver coupe, midnight blue leather, manual, RSRs, Live re-map, KW Variant 3, 18" Turbo Twists OWNED FOR 12yrs NOW RIP :-(
Possible Cayman S next?
 
  
View user's profile Send private message
   
Endoman
Imola


Joined: 11 Apr 2011
Posts: 771
Location: Bolton U.K.


PostPosted: Sat Jun 17, 2017 10:24 am    Post subject: Reply with quote

As Tore said door switches were my problem a few years ago the alarm would also trigger at most inconvenient times.
_________________
Porsche 944 S2 Coupe Guards Red
Porsche 993 Coupe 9m RS Replica
 
  
View user's profile Send private message
   
kerb scraper
Spa-Francorchamps


Joined: 25 May 2012
Posts: 343
Location: Hertfordshire

1997 Porsche 993 Carrera 4

PostPosted: Sat Jun 17, 2017 1:02 pm    Post subject: Reply with quote

toddgibbs123 wrote:
Interesting post as I recently had the same issue.

I even went as far as to remove my speedo to see if the light is actually going out (which it wasn't!!). Even though it did go out when I used a screwdriver to fake the bonnet closing (I tried it numerous times as I couldn't see why it wasn't working)

Solution (as already suggested) : remove the bulb Smile

Todd


With the greatest respect; that's not a solution it's a bodge.

Possibly a faulty door switch is finding earth through the frunk light circuit. The illuminati do not take kindly to anything other than 100% functionality of all systems.
_________________
1997 C4 Cabriolet, Arctic Silver, black interior, 18" hollow spokes, Bilstein PSS10s, RSRs, 200 cell cats, Mobil 1 sticker, LED to interior. Bergville t-lights.
 
  
View user's profile Send private message
   
toddgibbs123
Newbie


Joined: 23 May 2015
Posts: 31
Location: Oxford, UK


PostPosted: Tue Jun 20, 2017 11:25 pm    Post subject: Reply with quote

You are 100% right Kerb_scraper - I should have said "short-term fix until you are dedicate time to it". Smile

Todd
_________________
1979 Porsche 930 GP White --
1995 Porsche 993 C2 manual ++
 
  
View user's profile Send private message
   
timm996
Monza


Joined: 17 May 2008
Posts: 234
Location: nottingham


PostPosted: Wed Jun 21, 2017 9:14 pm    Post subject: Reply with quote

toddgibbs123 wrote:
Interesting post as I recently had the same issue.

I even went as far as to remove my speedo to see if the light is actually going out (which it wasn't!!). Even though it did go out when I used a screwdriver to fake the bonnet closing (I tried it numerous times as I couldn't see why it wasn't working)

Solution (as already suggested) : remove the bulb Smile

Todd



took speedo out? just leave phone on video in the frunk, then play it back.
_________________
I know I ain't doing much, doing nothing means a lot to me - Bon Scott:
 
  
View user's profile Send private message
   
toddgibbs123
Newbie


Joined: 23 May 2015
Posts: 31
Location: Oxford, UK


PostPosted: Wed Jun 21, 2017 9:28 pm    Post subject: Reply with quote

timm996 wrote:

took speedo out? just leave phone on video in the frunk, then play it back.


Love it - its little ideas like this that make forums worthwhile Smile
_________________
1979 Porsche 930 GP White --
1995 Porsche 993 C2 manual ++
 
  
View user's profile Send private message
   
Display posts from previous:   
Post new topic   Reply to topic   All times are GMT - 11 Hours
Page 1 of 1

 
Jump to:  

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum
You cannot post calendar events in this forum