I have my new Octavia 2013 elegance for almost three weeks now. I have a weird boot open warning issue with the car.

 

How this happen: ->  If one of the interior lights are on (top front or rear or glowbox) and then someone open the boot door (and boot lights are turned on), after closing the boot door, a repetitive boot open warning is displayed on maxidot and it beeps as hell when you drive. 

 

I have read all the forum related topics which says if one of the lights are led, this can happen. However, none of the lights are led. The only LED light was the reverse light which I even change that to normal bulb. I also change all the interior and glowbox bulbs to normal bulbs (even all the same brand) I bought from halfords (https://www.halfords.com/motoring/bulbs/ring-pro-501-w5w-car-bulb-twin-pack-439846.html). The only way to solve it is to take of the boot bulbs 

 

The previous owner seems to be fan of LED bulbs (as he had fitted the reverse with LED and I also found a spare LED bulb for the front lights in the boot). Also, I guess the boots light had been fitted with LED bulbs and then he replaced back to normal bulbs as the boot bulbs were quite loose. The car has auto light.

 

Might he have done coding for the LED lights? 

 

Thanks a lot for your time.

Sounds like an earthing fault.  Are there any faults reported (reported on the CANBUS network) - with any error codes?

I have not scanned the car for any error code. Should I?

 

I only have a simple OBD2 scanner (Carista). Does it do the job or I need to use a VCDS?

A simple scanner will do just fine.  Just don't clear the faults; because the dealers use them to read the fault codes.

Post the fault code numbers on here and we'll try and assist.

Do you know if using LED bulb for the reverse lights would generate any error without coding?

Depends how closely the LEDs simulate the electrical characteristics of an standard bulb...

Scanned the car with my Carista OBD2 tool and got the following errors. Most of them are archive[inactive] errors though and some of the unrelated, but not deleted them.

@varaderoguy any idea if any of these error could cause the boot open warning issue when one of the interior lights is turned on?

 

Quote

============1==============

7150

Raw code: 001BEE

ECU: 01. Engine control unit[Archive (inactive)]

Status: Test failed since last DTC clear

Status bits: 1

Priority: 6

Frequency: 1

Unlearning index: 255

Odometer: 101196 km

Date, time: 2021.01.11 00:00:29

============2==============

2838

Raw code: 000B16

ECU: 01. Engine control unit[Archive (inactive)]

Status: Test failed since last DTC clear, Test not completed during this operation cycle

Skoda: P008700: Fuel Rail/System Pressure - Too Low

 

============3==============

5583

Raw code: 0015CF

ECU: 01. Engine control unit[Archive (inactive)]

Status: Test failed since last DTC clear, Test not completed during this operation cycle

Skoda Fabia 2015-2021; Scala, Kamiq 2019-2021; Octavia III 2013 - 2020, Kodiaq 2017 - 2021, Karoq 2018 - 2021; Octavia 2020-2021; Superb 2015-2021; Citigo 2012-2021: P052200: Engine Oil Pressure Sensor/Switch "A" Low

Skoda Rapid EU(A-Entry) 2013 - 2021; Fabia II 2011 - 2015, Roomster 2011 - 2015, Rapid 2010 - 2021; Fabia 2015-2018; Octavia II 2009 - 2013, Yeti 2010 - 2018; Superb II 2008-2015: P164C00: Reduced oil pressure switch

Implausible signal

 

============4==============

590081

Raw code: 090101

ECU: 08. Heater and climate[Archive (inactive)]

Status: Confirmed

Skoda: B10A911: Activation A/C compressor

Short circuit to ground

Status bits: 1

Priority: 2

Frequency: 1

Unlearning index: 119

Odometer: 101240 km

Date, time: 2021.01.22 12:01:10

============5==============

1048838

Raw code: 100106

ECU: 08. Heater and climate[Archive (inactive)]

Status: Confirmed

Skoda: B185211: Indicator light for instrument panel vents

Short circuit to ground

Status bits: 1

Priority: 6

Frequency: 11

Unlearning index: 121

Odometer: 101119 km

Date, time: 2021.01.03 09:22:11

============6==============

0263

Raw code: 000107

ECU: 09. Onboard supply control unit[Archive (inactive)]

Status: Confirmed

Skoda Rapid EU(A-Entry) 2013 - 2021; Fabia 2015-2021; Fabia 2015-2018; Scala, Kamiq 2019-2021; Octavia III 2013 - 2020, Kodiaq 2017 - 2021, Karoq 2018 - 2021; Octavia 2020-2021; Superb 2015-2021; Citigo 2012-2021: B131411: Supply voltage for interior lighting

Short circuit to ground

Skoda Octavia III 2013 - 2020, Kodiaq 2017 - 2021, Karoq 2018 - 2021; Octavia 2020-2021; Superb 2015-2021: B13C698: Power sunroof control module

Temperature too high

Skoda Octavia 2020-2021: C102429: ESP sensor units

Implausible signal

Skoda: C12A7F1: Wheel loose detection

Right front

Skoda: U000900: High Speed CAN Communication Bus

(-) shorted to Bus ()

 

============7==============

10506

Raw code: 00290A

ECU: 09. Onboard supply control unit[Archive (inactive)]

Status: Confirmed

Skoda: B12BE15: Left tail lamp bulb

Open circuit/short circuit to B

Status bits: 1

Priority: 2

Frequency: 1

Unlearning index: 116

Odometer: 101192 km

Date, time: 2021.01.08 20:20:33

============8==============

11786

Raw code: 002E0A

ECU: 09. Onboard supply control unit[Archive (inactive)]

Status: Confirmed

Skoda Fabia II 2011 - 2015, Roomster 2011 - 2015, Rapid 2010 - 2021; Octavia II 2009 - 2013, Yeti 2010 - 2018; Octavia 2020-2021; Superb II 2008-2015: P1BB400: Cylinder head temperature

too low

Skoda Rapid EU(A-Entry) 2013 - 2021; Fabia 2015-2021; Fabia 2015-2018; Scala, Kamiq 2019-2021; Octavia III 2013 - 2020, Kodiaq 2017 - 2021, Karoq 2018 - 2021; Octavia 2020-2021; Superb 2015-2021; Citigo 2012-2021: B12C715: Left rear fog light bulb

Open circuit/short circuit to B

Skoda: P017B00: Cylinder Head Temperature Sensor Circuit Range/Performance

Status bits: 1

Priority: 2

Frequency: 1

Unlearning index: 116

Odometer: 101192 km

Date, time: 2021.01.08 20:20:33

============9==============

12298

Raw code: 00300A

ECU: 09. Onboard supply control unit[Archive (inactive)]

Status: Confirmed

Skoda Rapid EU(A-Entry) 2013 - 2021; Fabia 2015-2021; Fabia 2015-2018; Scala, Kamiq 2019-2021; Octavia III 2013 - 2020, Kodiaq 2017 - 2021, Karoq 2018 - 2021; Octavia 2020-2021; Superb 2015-2021; Citigo 2012-2021: B12CA15: License plate lamp

Open circuit/short circuit to B

Skoda Rapid EU(A-Entry) 2013 - 2021; Scala, Kamiq 2019-2021; Octavia III 2013 - 2020, Kodiaq 2017 - 2021, Karoq 2018 - 2021; Octavia 2020-2021; Superb 2015-2021: U122C00: Ethernet databus branch 1

No communication

Skoda: P0B5500: Hybrid/EV Battery Voltage Sense "F" Circuit

Range/Performance

Status bits: 1

Priority: 2

Frequency: 1

Unlearning index: 131

Odometer: 101515 km

Date, time: 2021.02.28 14:16:03

============10==============

12307

Raw code: 003013

ECU: 09. Onboard supply control unit[Archive (inactive)]

Status: Confirmed

Skoda Rapid EU(A-Entry) 2013 - 2021; Fabia 2015-2021; Fabia 2015-2018; Scala, Kamiq 2019-2021; Octavia III 2013 - 2020, Kodiaq 2017 - 2021, Karoq 2018 - 2021; Octavia 2020-2021; Superb 2015-2021; Citigo 2012-2021: B12CA01: License plate lamp

Electrical error

Skoda Rapid EU(A-Entry) 2013 - 2021; Scala, Kamiq 2019-2021; Octavia III 2013 - 2020, Kodiaq 2017 - 2021, Karoq 2018 - 2021; Octavia 2020-2021; Superb 2015-2021: U12C800: MAC address conflict in Ethernet switch branch 1

Skoda: B115913: Sliding door opening motor activation

Open circuit

Status bits: 1

Priority: 2

Frequency: 2

Unlearning index: 131

Odometer: 101515 km

Date, time: 2021.02.28 14:15:36

============11==============

12554

Raw code: 00310A

ECU: 09. Onboard supply control unit[Archive (inactive)]

Status: Confirmed

Skoda Rapid EU(A-Entry) 2013 - 2021; Fabia 2015-2021; Fabia 2015-2018; Scala, Kamiq 2019-2021; Octavia III 2013 - 2020, Kodiaq 2017 - 2021, Karoq 2018 - 2021; Octavia 2020-2021; Superb 2015-2021; Citigo 2012-2021: B12CB15: Left back-up light bulb

Open circuit/short circuit to B

Skoda: P0AE900: Hybrid Battery Temperature Sensor "D" Circuit Range/Performance

Status bits: 1

Priority: 2

Frequency: 1

Unlearning index: 116

Odometer: 101192 km

Date, time: 2021.01.08 20:20:40

============12==============

14602

Raw code: 00390A

ECU: 09. Onboard supply control unit[Archive (inactive)]

Status: Confirmed

Skoda: B133A15: Left brake/tail lamp bulb

Open circuit/short circuit to B

Status bits: 1

Priority: 1

Frequency: 1

Unlearning index: 116

Odometer: 101192 km

Date, time: 2021.01.08 20:20:33

============13==============

197644

Raw code: 03040C

ECU: 09. Onboard supply control unit[Archive (inactive)]

Status: Confirmed

Skoda: B126301: Tank lid unlock activation

Electrical error

Status bits: 1

Priority: 4

Frequency: 33

Unlearning index: 97

Odometer: 99557 km

Date, time: 2020.10.17 18:08:09

============14==============

395521

Raw code: 060901

ECU: 09. Onboard supply control unit[Archive (inactive)]

Status: Confirmed

Skoda Fabia 2015-2018; Octavia III 2013 - 2020, Kodiaq 2017 - 2021, Karoq 2018 - 2021; Octavia 2020-2021; Superb 2015-2021; Citigo 2012-2021: B202300: Function limitation due to active protector function

Skoda Rapid EU(A-Entry) 2013 - 2021; Fabia 2015-2021; Scala, Kamiq 2019-2021: U11B700: Vehicle electrical system control module

Unauthorized wake-up cause

Status bits: 1

Priority: 6

Frequency: 2

Unlearning index: 116

Odometer: 101191 km

Date, time: 2021.01.06 19:35:59

============15==============

934149

Raw code: 0E4105

ECU: 09. Onboard supply control unit[Archive (inactive)]

Status: Confirmed

Skoda: B136676: Rain/light recognition sensor

Incorrect installation location

Status bits: 1

Priority: 2

Frequency: 54

Unlearning index: 128

Odometer: 98573 km

Date, time: 2020.09.02 16:56:32

============16==============

1555

Raw code: 000613

ECU: 5F. Electronic Information System 1

Status: Test failed, Confirmed

Skoda Rapid EU(A-Entry) 2013 - 2021; Fabia 2015-2021; Scala, Kamiq 2019-2021; Octavia II 2009 - 2013, Yeti 2010 - 2018; Octavia III 2013 - 2020, Kodiaq 2017 - 2021, Karoq 2018 - 2021; Octavia 2020-2021; Superb 2015-2021; Citigo 2012-2021: B201A00: Checking software version management

Skoda: C1331F8: Digital matrix light

Showroom mode active

Status bits: 1

Priority: 6

Frequency: 1

Unlearning index: 92

Odometer: 101536 km

Date, time: 2021.03.02 17:54:02

============17==============

15360256

Raw code: EA6100

ECU: 5F. Electronic Information System 1[Archive (inactive)]

Status: Confirmed

Skoda: U110100: Component protection active

Status bits: 1

Priority: 3

Frequency: 1

Unlearning index: 128

Odometer: 101490 km

Date, time: 2021.02.21 11:44:50

 

20 minutes ago, Vahids said:

any idea if any of these error could cause the boot open warning issue when one of the interior lights is turned on?

Yes; there is an obvious fault that seems to be registering and causing a lot of errors:

Take number 7 from your list:

 

10506

Raw code: 00290A

ECU: 09. Onboard supply control unit[Archive (inactive)]

Status: Confirmed

Skoda: B12BE15: Left tail lamp bulb

Open circuit/short circuit to B

Status bits: 1

Priority: 2

Frequency: 1

Unlearning index: 116

Odometer: 101192 km

Date, time: 2021.01.08 20:20:33

 

There are similar faults being shown for 8, 12 and 13 in your list.

 

Because there is an electrical short circuit or open circuit, this is having all kinds of odd reporting faults - effecting control circuits and the ECU is NOT a happy bunny.

The fault you are experiencing is based on the fact that I think you are lost an earth.  The current return is going back via a different route causing the interior light to operate randomly.

 

Its auto-electrican time on this one I'm afraid.  Keep those logs, show the auto-electrican and he will try and find either the electrical short or the open-circuit.  Suspect it could be cable rub-through or a faulty earth.

The Open circuits have been me taking out the bulbs and replacing with another (for example for license plate). But, also they have inactive label, which to me means they do not exist anymore, no?

4 minutes ago, Vahids said:

The Open circuits have been me taking out the bulbs and replacing with another (for example for license plate).

Okay - fair enough.  If you have done this whilst the car is running, then those message will be flagged, but I would ask you to look at the other messages there:

 

4, 5 and 6 all mention electrical shorts/open circuits.

 

Just out of interest, whats happening on 16 or 17?  Showroom mode has been activated???? and component protection has been activated for your Radio?? on 17.

Its either got itself in a major tissy or possibly there have been some modifications??? :-)

 

 

The only other way to try and see what faults are real or not - are to clear the logs, run the car and see what new faults get logged.

16 was happened due to changing the dispay, as my current display LCD is getting many dead pixels. And 17, I remember the other day I was trying to clean the volume knob and I think I turned the unit on/off a lot of time, so maybe it got confused. I saw the message CP active on the display which asked me to ignite the car and then it went away.

Dont know what should I do about 16 though, It is the same display with the same serial number, but it activates that showroom error.

The one which is the most related concerning one is number 6:

 

0263

Raw code: 000107

ECU: 09. Onboard supply control unit[Archive (inactive)]

Status: Confirmed

Skoda Rapid EU(A-Entry) 2013 - 2021; Fabia 2015-2021; Fabia 2015-2018; Scala, Kamiq 2019-2021; Octavia III 2013 - 2020, Kodiaq 2017 - 2021, Karoq 2018 - 2021; Octavia 2020-2021; Superb 2015-2021; Citigo 2012-2021: B131411: Supply voltage for interior lighting

Short circuit to ground

Skoda Octavia III 2013 - 2020, Kodiaq 2017 - 2021, Karoq 2018 - 2021; Octavia 2020-2021; Superb 2015-2021: B13C698: Power sunroof control module

Temperature too high

Skoda Octavia 2020-2021: C102429: ESP sensor units

Implausible signal

Skoda: C12A7F1: Wheel loose detection

Right front

Skoda: U000900: High Speed CAN Communication Bus

(-) shorted to Bus ()

The point that I cannot understand from the above is why different type of errors are flagged! For example, why does it say wheel loose detection and also hight speed CAN bud short to bus?

1 minute ago, Vahids said:

0263

Raw code: 000107

ECU: 09. Onboard supply control unit[Archive (inactive)]

Status: Confirmed

Skoda Rapid EU(A-Entry) 2013 - 2021; Fabia 2015-2021; Fabia 2015-2018; Scala, Kamiq 2019-2021; Octavia III 2013 - 2020, Kodiaq 2017 - 2021, Karoq 2018 - 2021; Octavia 2020-2021; Superb 2015-2021; Citigo 2012-2021: B131411: Supply voltage for interior lighting

Short circuit to ground

Skoda Octavia III 2013 - 2020, Kodiaq 2017 - 2021, Karoq 2018 - 2021; Octavia 2020-2021; Superb 2015-2021: B13C698: Power sunroof control module

Temperature too high

Skoda Octavia 2020-2021: C102429: ESP sensor units

Implausible signal

Skoda: C12A7F1: Wheel loose detection

Right front

Skoda: U000900: High Speed CAN Communication Bus

(-) shorted to Bus ()

 

There are actually two faults on this section: I agree an electrical short to ground for the interior light circuitary - and the second fault is ESP sensor failure (probably on the Front Right wheel) - which thinks the wheel is literally come off!

3 minutes ago, Vahids said:

Skoda: U000900: High Speed CAN Communication Bus

(-) shorted to Bus ()

That's just saying there is an electrical failure of the HIGH canbus network - again a short-circuit.

 

This car hasn't been involved in an accident has it?

Not that I have been aware of, why?

Only because the errors showing are extremely random.  I do think an electrical short is probably your culprit and I suspect it will probably be in a location where there is movement in the cable loom (think the interface between chassis and doors) and a lot of these faults are probably spurious and will clear themselves up when the electrical short is discovered.

Will try to clear the errors and see how it goes.

Hahaha, modern cars log everything you do with them, is good in total, but cause a lot of stress as well.

Where VCDS reports a short circuit to ground or an open circuit you can be reasonably sure thats what was measured although so many of the terms they use are completely incorrect and misleading, possibly through bad translations.

 

When it reports open/short circuit it really is meaningless other than to say that the voltage drop across the circuit is outside of normal operating parameters, it could be an open circuit (blown bulb, broken wire etc), it could be a short to ground but that would normally blow the fuse, more likely a higher rated bulb drawing more current (= more volt drop) or an LED bulb drawing less (less volt drop).

 

I would not go chasing bad earths on the basis of a poorly worded term and badly concieved diagnostic software that is entirely capable of discriminating between an open circuit and a short circuit or even partial ones, higher or lower resistance than design parameters.

Thanks for your comment @J.R. very helpful. The thing you pointed about short circuit blowing fuse is completely valid. Fortunately, I don't have any other electrical issue at the moment (which I am aware of at least) except this ridiculous boot warning. I am very suspicious this has happened due to the previous owner using a lot of LED bulbs in the car. The reverse bulbs were still there when I bought it, there is a spare front LED bulb in the boot and also I am sure he has used LED bulbs for boots as well (but he replaced them back to normal lights). So, if I know what has gone wrong with the process of using LED bulbs, it is very likely to solve the issue. 

If you have replaced the reversing light bulbs with incandescent ones then double check that they are the correct specified wattage, maybe even swap them out for another pair?