Hello,
 

TL;DR: Can't communicate with abs module, is it possible to buy a new "abs ecu"? Does anyone have the part number?

 

I don't have VCDS, but some off-brand (vag specific) obd2 reader, which can enter measure blocks and such. However, I can't communicate with the abs module. I can enter the module once, immediately after I started the car, but I can't do anything such as enter the measure block. I can enter measure blocks for different modules, so I know the obd2 reader is not the problem.

 

The esp and abs light is on, constantly. When driving 90+ km/h, the brake warning light comes on and beeps 3 times. No fault codes (can't reach the abs module, so I can't read any codes specifically for the brakes).

 

I recently had the hydraulic block replaced, but it didn't fix the problem, so I'm pretty sure there's something wrong with the abs ecu itself. Does anyone know the part number? (Do you even call it "abs ecu"??)

 

(I know you're not supposed to just buy parts and replace something without knowing if it needs to be replaced, but I got the replacement module for a pretty good price.)

 

Thanks in advance!

18 minutes ago, Addemod said:

I know you're not supposed to just buy parts and replace something without knowing if it needs to be replaced, but I got the replacement module for a pretty good price.

To answer your questions, Yes, No, and Have you seen the price of the ABS ECU?

40 minutes ago, KenONeill said:

To answer your questions, Yes, No, and Have you seen the price of the ABS ECU?

I have not, as I can't find it separately from the rest of the module.

I suspect the error is because the new module wasn't coded to the car.

The problem with the present one may be something external like a blown fuse or broken wire, I've seen a few threads where such a wiring fault caused this communication error, including a recent one.

I would disconnect the connector from the module and methodically start to check all supply connections. I'll research pin numbers for you now. You may well see a part number on the ECU/module near to the connector, 

Assuming the car doesn't have "mountain driving assist" (HHC), you're looking at a permanent 12V supply from e-box fuse 16 via a red/green wire to pin 1 at the module; another from fuse 4 via a red wire to pin 32 at the module. Both of these fuses are 30 amp rated. The e-box is the engine-bay fuse/relay holder.

 

An ignition-on supply comes from fuse 2 (5 amp rated) in the cabin fusebox via a black/grey wire to pin 4 at the module. This one will only be at 12V with ignition on obviously.

Earth connections to the module are at pins 16 and 47.

 

Verify that all these are intact before spending any more on parts.

4 hours ago, Wino said:

Assuming the car doesn't have "mountain driving assist" (HHC), you're looking at a permanent 12V supply from e-box fuse 16 via a red/green wire to pin 1 at the module; another from fuse 4 via a red wire to pin 32 at the module. Both of these fuses are 30 amp rated. The e-box is the engine-bay fuse/relay holder.

 

An ignition-on supply comes from fuse 2 (5 amp rated) in the cabin fusebox via a black/grey wire to pin 4 at the module. This one will only be at 12V with ignition on obviously.

Earth connections to the module are at pins 16 and 47.

 

Verify that all these are intact before spending any more on parts.

Thank you, I will have this checked out.

No blown fuses.

On 08/08/2021 at 10:01, Wino said:

Assuming the car doesn't have "mountain driving assist" (HHC), you're looking at a permanent 12V supply from e-box fuse 16 via a red/green wire to pin 1 at the module; another from fuse 4 via a red wire to pin 32 at the module. Both of these fuses are 30 amp rated. The e-box is the engine-bay fuse/relay holder.

 

An ignition-on supply comes from fuse 2 (5 amp rated) in the cabin fusebox via a black/grey wire to pin 4 at the module. This one will only be at 12V with ignition on obviously.

Earth connections to the module are at pins 16 and 47.

 

Verify that all these are intact before spending any more on parts.

I have confirmed that I don't have a permanent 12v supply to either pin 1 or 32. Ground looks good on pin 16 and 47.

 

I'm not sure how to proceed now.

The fuses of course looks good. I tested with new fuses for both 4 and 16 without any success

Nevermind..... There is a permanent 12v supply to both 1 and 32.. Don't ask haha