ZV Remote control not working

Hello everyone,

I'm having a problem, and maybe someone can help me!

Hardware:
VW Caddy TDI, year 2000, 352,000 km. Engine: AHU (with a faulty turbocharger pressure sensor, no other defects). Electric package: central locking with remote key, electric windows, air conditioning.

Problem:
ZV can be used to lock and unlock all doors.
The remote control should be working (the red LED should blink when pressed).
The central locking system is not responding to the remote key fob.

Even an initialization attempt according to the BV (German Federal Waterways and Shipping Administration) does not work. (Ignition on for at least 10 seconds, then (within 20 seconds), with the key inserted and the 'unlock' button pressed, press the 'open' button 3 times --> the key LED flashes 5 times).

'I can't find any control unit (is it ZV 35?) using VAG-Com; it's not detected.'
Existing STG 01/03/25/33 models, with...?

All fuses are OK.

Disconnecting the battery and bridging the terminals didn't make any difference either.

Does anyone know if I can access the control unit using VAG-Com, and where it is located?
I would be grateful for any help.

TT - Diesel.

Hi,

The central locking system (ZV) is accessed via the comfort control unit, address 46. Okay, let's start by reading the error codes.
The SG unit is located beneath the steering column.

Has the remote control ever actually worked?

Try to pair the remote control.
Turn the ignition on and lock the car from the outside using your second key.
Then, press the lock or unlock button (try both) on the remote control, and unlock the car again using the second key. Turn off the ignition, and the central locking system should work. If that doesn't work, you can still try re-syncing it using VAG COM. Then get back to me.

Best regards.

Thank you for the quick response.

The remote control was working perfectly fine until 5 days ago.

I will try to 'train' the key.
The second key is a standard key without any remote functions, just the basic key with immobilizer.
Is that a problem?

Normally, the 'Comfort' control unit (46) should report itself when searching for control units.
must?

Okay, I'll try to get it working tomorrow or by Thursday.
I will definitely get back to you.

Thank you in advance.

TT - Diesel

Hello,

I searched for the control unit again using VAG-Com.
The VAG-Com tool cannot find a control unit with address 46.

I can't find any control units under the steering column either.

Unfortunately, the key programming didn't work either.

The garage door opener used to work with a key in the lock, but the remote control function has stopped working for the past few days.
And as mentioned in the first post, the LED on the key fob blinks when I press the unlock or lock button.

Please provide information on how to program a new key using VAG-Com.

Just to reiterate, the Caddy is still the older model (9K9), manufactured in 01/2000.

Regards,
TT - Diesel.

Hi,

Before you start disassembling the car or messing around with anything, I would suggest trying to replace the battery in the key fob.
More energy is required to send a message than it takes to make an LED blink. By the way, this effect also occurs with infrared remote controls; the control LED blinks.
Still cheerful, but the IR signal is corrupted, and the device no longer responds because the batteries are (almost) dead.

Regards,
dieter

Hello TT-Diesel,

Unfortunately, I can't help you further if you can't find either SG 35 or SG 46. The adjustment can only be performed using VAG-Com within the adjustment function of this control module.
If a comfort system (46) or a central locking system (35) is not recognized, the K-line may also be experiencing a fault. You might need to consult a wiring diagram for that, but it's quite unlikely.

Apparently, the Caddy has a completely different onboard network system compared to similar vehicles within the same group of companies. I'm not very familiar with that kind of thing. However, I believe that the Caddy is technically a SEAT, similar to the Polo Classic. It's possible that you might find some information in a SEAT forum, specifically from owners of Ibiza, Cordoba, or Terra models.

The battery issue is probably the most likely explanation, but surely you've already replaced that, right?

Is this remote control an original VW part? Is it still the old infrared remote control?

Hello,

It is an original radio-controlled gate opener.

I measured the batteries from the transmitter.

should be 3.0V = 3.03 volts per battery (2 pieces).

should still be in good condition.

Okay, I'll take that idea and change the batteries.
It would certainly be plausible if the battery failed during transmission.
but the LED still blinks before the signal is sent.

However, at the moment, a question arises for me:

Where is my ZV-STG?

Since the car's central locking system works with a key, I can assume the key must be inside the car.

I think I'll contact customer support if replacing the batteries in the transmitter doesn't solve the problem.

Thank you very much for your help.


Regards,
TT-Diesel.

Hi,

The Caddy is indeed quite closely related to the Polo Classic and the Seat Ibiza.

I'm not surprised that you can't access the control unit via diagnostics... it's the same with the Ibiza. Michael II did some more research on this... apparently, the device even has a diagnostic line, but it's not connected to the rest of the system. Therefore, there's no chance of getting close to that.

Regarding the installation location: At least in the Ibiza, the device is supposedly (although I've never verified this) a single unit with the central locking pump motor and is located at the rear right, near the fuel tank release (which is operated directly via a rod; everything else is pneumatic).

I'm not sure how it works with the Caddy... but I can take a look in the Polo/Caddy DIY manual.

Hmm... they're not distinguishing between the Polo and the Caddy, so it should be available there too.

Take a look at your owner's manual; it should describe how to manually unlock the fuel door if the central locking system fails. This should bring you very close to the part, as it requires you to manually move the mentioned rod.

Best regards,

Jan.

Hello everyone,

I would like to retrofit a central locking module (ZVM) for my Audi.
Does anyone have the cable pinout, including the colors?

A4 Avant B5 TDI
1998
AFN @ 247,000 km
Rear right-side air suspension compressor located in the trunk.
All doors with central locking.

Thank you for that.

Regards,

Volker.

It's possible that the transmitting unit is also defective! This happens quite often, and in that case, the only solution is to replace it! By 'transmitting unit,' I mean the back part of the key!
Costs 70 €.