2007 Octavia VRS TDI Bizarre Front Wiper Problems.

[fireman8109]

Hi all,

Proud owner of a 2007 Octavia VRS TDI that has suddenly developed a weird fault with the front windscreen wipers, I have searched the forums for info but came up blank.

The problem started 3 days ago & is a real weird one, when the engine gets up to operating temperature the front wipers start going by themselves sometimes even varying in speed, the switch has no effect & even when I switch the engine off, remove the keys & lock the cat they keep operating even for upto 15 minutes afterwards, once they stop they will not switch on again with the stalk until the vehicle has sat for a period of time.

I have scanned the car with vcds & found no faults & their is nothing installed on the car that should not be.

Any ideas?

Barry

[walidhosny]

Your car is equipped with rain sensor that operates the wipers due to any vibrations hitting the front glass try to check the rain sensor for any faults.

[walidhosny]

Edited 22 March, 2016 by walidhosny

[hrvrs]

Your car is equipped with rain sensor that operates the wipers due to any vibrations hitting the front glass try to check the rain sensor for any faults.

 

Never heard of a rain sensor that functions by detecting vibrations, are you sure it's not internal reflection based?

[trundlenut]

Never heard of a rain sensor that functions by detecting vibrations, are you sure it's not internal reflection based?

That's what I thought too. Also it's unlikely a vRS has the RLS as it was not standard fit in the UK.

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[walidhosny]

If the rain sensor is active the wipers will begin moving when street sand hits the front glass or if you hit with your thumb on the front glass.

[trundlenut]

If the rain sensor is active the wipers will begin moving when street sand hits the front glass or if you hit with your thumb on the front glass.

By that thinking then I water was to run down the screen, say from the roof, there would be no vibration and so the wipers would not operate. This is not the case. Also I can't see that they would work in a light drizzle, or driving at speed would cause more than enough vibration to trigger the wipers.

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[Tech1e]

They work by a light prism. Water effects the lights direction in the sensor so it activates the wipers.

To me it sounds like a faulty wiper motor.

[fireman8109]

Thanks everyone for the help, car is fitted with auto wipers but still happens with sensor disconnected, have a new wiper motor on order, fingers crossed that it sorts the problem, just odd that it only happens when engine is up to temperature.

[hrvrs]

Thanks everyone for the help, car is fitted with auto wipers but still happens with sensor disconnected, have a new wiper motor on order, fingers crossed that it sorts the problem, just odd that it only happens when engine is up to temperature.

 

I've had some unusualness on a previous car when the wiper motor relay began to fail

 

Hope the motor sorts it but if not that would be where I'd look next

[fireman8109]

I've had some unusualness on a previous car when the wiper motor relay began to fail

Hope the motor sorts it but if not that would be where I'd look next

Do the wipers have a relay? I thought they were controlled by the body control module. Edited 23 March, 2016 by fireman8109

[hrvrs]

Do the wipers have a relay? I thought they were controlled by the body control module.

 

They will be controlled by the BCM but a high current component like a motor usually has a relay to protect the BCM internals

 

A *very* quick Google search would lead me to believe that there is a physical relay, but don't quote me on that 100%

[langers2k]

They will be controlled by the BCM but a high current component like a motor usually has a relay to protect the BCM internals

 

A *very* quick Google search would lead me to believe that there is a physical relay, but don't quote me on that 100%

 

Looking at the wiring diagrams, there is no relay for the front wiper. If there is, it'll be inside the wiper unit and not replaceable.

 

It has a feed directly from the battery via a 30a fuse and earth. There is also a LIN bus connection back to the BCM which will be used for diagnostics and controlling the wipers.

 

As you have VCDS, it might be worth looking to see if the wiper motor is visible (should be a subsystem under the BCM) and if there are any measuring blocks to see why it's turned on. As Tech1e says, it's probably a broken wiper unit.

[hrvrs]

Looking at the wiring diagrams, there is no relay for the front wiper. If there is, it'll be inside the wiper unit and not replaceable.

 

I stand corrected

 

The thread I'd dug up was for rear wiper

 

Slightly off topic but where did you source the wiring diagrams?  Always useful to have...

[langers2k]

Slightly off topic but where did you source the wiring diagrams?  Always useful to have...

 

The best source is https://erwin.skoda-auto.cz - they charge for access but should give you access to everything you need. A 'print to pdf' plugin is very useful

[fireman8109]

Just a quick update, changed the wiper motor today & the the problem still exists, starting to think that I have a faulty cem, can I just fit a used one (same part number etc) or would I need a new one?

[Tech1e]

I'd get it on VCDS and see if the switch is activating it or if the central electrics control unit is doing it on its own.

2007 car doesn't have a BCM as such.

[fireman8109]

I'd get it on VCDS and see if the switch is activating it or if the central electrics control unit is doing it on its own.

2007 car doesn't have a BCM as such.

I have only just purchased vcds, could you please offer any advice on how to carry out such a test.

Thanks

Barry

Edited 26 March, 2016 by fireman8109

[fireman8109]

Hi,

The problem happened again today & I finally managed to get some fault codes through vcds, these are shown below, any ideas?

 

Address 09: Cent. Elect.        Labels: 3C0-937-049-30-H.lbl

   Part No SW: 3C8 937 049 AC    HW: 3C8 937 049 AC

   Component: Bordnetz-SG     H64 3205 

   Revision: 00H64000    Serial number: 00000006052575

   Coding: E1880F030004140000110D000000000000087F075C000000000000000000

   Shop #: WSC 00568 210 01865

   VCID: 72EBBDBF6DAAE5AE78-8026

 

   Subsystem 1 - Part No: 1Z2 955 119 C  Labels: 1KX-955-119.CLB

   Component: Wischer 210909 022  0601 

   Coding: 00055223

   Shop #: WSC 00568 

 

   Subsystem 2 - Part No: 1K0 955 559 AH  Labels: 1K0-955-559-AG.CLB

   Component: RLS     300610 054  0403 

   Coding: 00209069

   Shop #: WSC 00568 

 

3 Faults Found:

02071 - Local Databus

            004 - No Signal/Communication - Intermittent

             Freeze Frame:

                    Fault Status: 00100100

                    Fault Priority: 2

                    Fault Frequency: 1

                    Reset counter: 31

                    Mileage: 247438 km

                    Time Indication: 0

 

             Freeze Frame:

                        ON

                    Voltage: 14.35 V

                        ON

                        ON

                        OFF

                        OFF

                        OFF

 

01520 - Rain and Light Recognition Sensor (G397)

            004 - No Signal/Communication - Intermittent

             Freeze Frame:

                    Fault Status: 00100100

                    Fault Priority: 2

                    Fault Frequency: 1

                    Reset counter: 31

                    Mileage: 247438 km

                    Time Indication: 0

 

             Freeze Frame:

                        ON

                    Voltage: 14.35 V

                        ON

                        ON

                        OFF

                        OFF

                        ON

 

00153 - Windshield Wiper Motor;  Driver Side (V216)

            004 - No Signal/Communication - Intermittent

             Freeze Frame:

                    Fault Status: 00100100

                    Fault Priority: 2

                    Fault Frequency: 1

                    Reset counter: 31

                    Mileage: 247438 km

                    Time Indication: 0

 

             Freeze Frame:

                        ON

                    Voltage: 14.35 V

                        ON

                        ON

                        OFF

                        OFF

                        ON

 

Also to cap it off my can gateway has suddenly given the fault below.  

 

Address 19: CAN Gateway        Labels: 1K0-907-530-V3.clb

   Part No SW: 1K0 907 530 L    HW: 1K0 907 951

   Component: J533  Gateway   H07 0052 

   Revision:   H07 01    Serial number: 150607F2001731

   Coding: E9807F060002021303

   Shop #: WSC 17029 210 94688

   VCID: 306F77B7A32697BECE-8064

 

1 Fault Found:

01044 - Control Module Incorrectly Coded

            000 -  -

             Freeze Frame:

                    Fault Status: 01100000

                    Fault Priority: 1

                    Fault Frequency: 9

                    Reset counter: 255

                    Mileage: 247433 km

                    Time Indication: 0

                    Date: 2000.00.00

                    Time: 16:37:11