D3WZ Diagnosis: What It Is and How to Treat It

Hello!

After reviewing the data, I couldn't find a suitable answer for my problem with my auxiliary heater. I can't access it with VAG COM. No diagnosis is possible. Although there should be a diagnostic lead included (according to the pinout of the connector). Is there any way to determine what's wrong with it?

Behavior of the auxiliary heater (which has been retrofitted with a conversion kit to function as a stand-alone heater).

If the car has been standing for a few days, the fan in the auxiliary heater runs briefly and then stops. If I turn on the auxiliary heater using the clock, the same thing happens. The car's ventilation system runs, and the auxiliary water pump also works. However, after driving the car for about half an hour, the auxiliary heater starts working normally again. Also, after turning off the engine, the auxiliary heater can be turned on and off normally using the clock. When the bus is standing again, the whole problem starts again. Now, it's becoming increasingly rare that the auxiliary heater can be activated again after this happens. There is no smoke coming out of the auxiliary heater's exhaust, and the air coming out of it doesn't smell like diesel.


Regards, Peter.

When you turn it on: Do you hear a clicking sound from the SH pump when the blower motor (SH) starts?

I had thought about that too. No, the booster pump isn't working. It will probably work again next time. How much does something like that cost?

Regards, Peter.

Hello,

The price is between €100 and €150, but I can check the exact price if you need it to be precise.
'On my Galaxy, a connector pin on the pump had corroded; it was difficult to see. I repaired it myself using a soldering iron and resin.'

Maybe this will help.

Greetings.

Helmut.

Yesterday, it was the same story again. The auxiliary heater doesn't work when starting the car, but it works perfectly fine afterwards. By the way, the pump in my T4 makes a very quiet ticking sound, barely audible. Is that a bad sign???

Regards, Peter.

Hmm, based on the error description, we can only guess.

Go to Bosch; they can read the error codes from the heating system themselves. That's probably the most sensible approach. I highly doubt that the heating system is already linked to your vehicle's onboard computer.

I suppose I'll have to go to the Bosch service center. Unfortunately, their service is terrible, so I don't really trust them.

Thank you and best regards, Peter.

Okay, disconnect the main connector in the engine compartment, connect a laptop with the appropriate software, and use Eberspächer software to read the data. It's actually quite straightforward. You can also run diagnostic programs to see if the heater is functioning correctly.

Since when has there been PC software available for Eberspächer products? I want it!

I only know the Webasto software.

CU Gremlin.

I've heard of Eberspächer software, but what about the connection? What are the pin assignments? Is an adapter necessary? Where can I get the software?

Regards, Peter.

Since when has there been PC software for Eberspächer? I want it!

I only know the Webasto software.


Just because the gentleman doesn't know about it, he shouldn't hastily conclude that such software doesn't exist.

Initially, my D4WSC spent a lot of time in the workshop (Bosch, Schweinfurt Hafen) because the control units of the SHs burned out three times. For some reason, all the fuses remained intact. However, the fourth version worked perfectly.

If the gentleman still doubts the existence of such software, he should contact the address mentioned above.

by the way
'The main connection between the SH (likely referring to a specific device) and the relay carrier/fuses was disconnected. It's a connector that then connects to the laptop via an adapter. This was likely related to a 'module clock' device, which can also be used to read data from the SH independently.'

I initially had a lot of issues with my D4WSC and spent a lot of time at the workshop (Bosch, Schweinfurt Hafen).

I once went there because of my Webasto heater. They wanted 40 DM for the error code reading and only offered it with an appointment. In the meantime, I've been to other Bosch service centers several times, and they always did it for free.

I would also be interested in software for Webasto systems! Where can I find it? Are there any adapters available?

There are products available for Webasto.
Okay, I'm ready. Please provide the German text you want me to translate.