Is it possible to illuminate all the warning lights in the dashboard to check they are all working, reason being my ABS light does not come on but I can see the wheel sensors and when running a check you can hear the ABS pump clicking and when driving it will activate if 2 wheels are on gravel. If I remove fuse 25 there is no warning light, next is to see if removing the main fuses will make a difference, I just want to make sure the ABS light has not been mapped out or something such like as my MOT station would like to see the ABS warning light come on (and go off).

Will

Look at strip fuse no.6 in the fuse tray above the battery. See if it looks newer than any of the others. That might indicate a repair to this common failure; which may have happened subsequently to someone masking the warning light.

Not sure if there's a way to make all the lights come on in the cluster, if there is it will be from "output tests" in module 17, the instrument cluster.

Possibly quite easy to remove and disassemble cluster enough to physically look.

I had a Polo with no emissions warning light that turned out to have a bit of black tape stuffed down the hole that the LED sat below.

I did take the cluster apart but all seems to be fine there, no dodgy bits of black tape or damaged light bulbs, I'll investigate further tomorrow.

3 minutes ago, Williamvb said:

I did take the cluster apart but all seems to be fine there, no dodgy bits of black tape or damaged light bulbs, I'll investigate further tomorrow.

Try removing the red/green wire from the strip fuse and go for a careful test drive. Should get a warning light quite soon after starting to move, I think.

Did you try driving with fuse 25 absent? (As opposed to just having ignition on or engine idling, stationary on driveway.)

No to both, I will have a go tomorrow, Thanks for the help

11 hours ago, Williamvb said:

Is it possible to illuminate all the warning lights in the dashboard to check they are all working, reason being my ABS light does not come on

IME you just switch the ignition on and then look properly rather than starting the engine or putting your seatbelt on during the BITE check. OK, that won't test the light bulb telltales but will test the others.

16 hours ago, Paws4Thot said:

IME you just switch the ignition on and then look properly rather than starting the engine or putting your seatbelt on during the BITE check. OK, that won't test the light bulb telltales but will test the others.

WHS.

Otherwise, I'm sure there's a thing you can do in VCDS/VAG-COM.

Right, investigated further,

cleaned all fuses and the metal strip, no change,

removed both fuses, an error, ID301 no indication on display, ABS return flow pump V39.

5A fuse back in, No fault found

Strip fuse out, 5A in, no fault found

strip fuse in, 5A in, NFF

The value of the ABS flow return pump is 0 with any combination of fuses removed

Solenoid Valve relay value is 1 with any combination of fuse options.

I have just come accross a site that mentioned that some errors only show up above 20 kph, something new to try for tomorrow..

Is there an easy way to disconnect the ABS connector, I just want to check the state of the individual wires before moving on, struggeling for access wven with the air filter housing removed.

It looks like there is a fault somewhere between the flow return pump and the dash board light but do correct me if I am wrong.

Further investigation, removed ABS pump from the car, someone has had the cover off the electronics and pump part previously, seems to measure through OK.

The next thing I am thinking if the ABS pump assembly was changed it will have to be coded to the vehicle, can all my trouble stem from the unit not being recognised by the ECU and that can cause the lack of ABS light and functioning ABS system.

The unit is a Bosch 6Q097379H, reading in previous posts that unit should be compatible with the ECU of an 04 VRS.

Will

Right, to conclude my journey with the missing ABS light, I checked the ABS pump, all seemed well, checked the wiring, again, all is well, that only left me with one option, the light in the cluster is faulty, sent the cluster off to a repair shop, Autotronics, got it back a few days later, fitted it and hey presto the ABS light comes on and goes off after a couple of seconds, result.

Here are the error codes I got on the VCDS before the repair:

Address 01 Engine

18061- please check DTC memory of ABS controller

18057- Power train data bus, missing message

Address 03 ABS Brakes

no fault found.

Address 09 Cent. Elect.

01316- ABS control module, no communications

01598- drive battery voltage, signal too low

Address 17 Instruments

01316- ABS control module, no communications

Address 19 CAN gateway

01316- ABS control module, no communications

It does appear that the lack of an indicator light in the cluster can cause these errors as, after clearing them, none returned

Oh and it passes the MOT. Wohoo

did a couple of hundred miles yesterday and no issues.