MK4 Keyless entry/exit remote control does not work. Vehicle will not start.

Hello friends,

I have a 2008 MK4 1.6 Petrol Ford Mondeo with keyless entry and start. I parked my car normally and when I returned, the doors did not open with the remote control, the vehicle did not start the ignition. The doors are opened with the key blade, that is, the central locking is opened, the hazard lights are on. fallow me home works. However, the ignition does not turn on. There is no error/warning on the screen. Only the Ford logo, km and time information are shown on the screen. The car started 3 times by chance but then the problem occurred again. If the remote control turns on, the vehicle also works.

Video

https://drive.google.com/file/d/1qfYRlC…EtweBGciCZ/view

The doors open with the key blade, the hazard lights are on. fallow me home works. The ignition does not turn on

Put the key in the compartment under the steering wheel (manual start). No reaction.

Disconnected the battery and waited for 1 hour. No reaction.

Changed the battery. No reaction.

Tried with the spare key. No reaction.

Checked all the relevant fuses. No reaction.

Erased the faults with OBDII. No reaction. (I think it connects to the vehicle's computer, there is no problem with that. However, there is another module (KVM) for this keyless entry, I could not connect to it because there is no IDS.)

Sprayed the sockets of the ECU etc. with contacts. No reaction.

2 Auto electricians looked and could not understand much.

The locksmith looked and could not understand anything.

We wanted to define the keys but could not connect.

Took it to the ECU repair shop, he could not understand either.

I didn't stay with them but they probably connected it to the PC and couldn't see anything. They didn't bother with it because it was a complicated subject and they didn't understand it.

I read about this fault on the internet from a Ford expert (Gallagher99). He wrote that the software and KVM should be updated. However, the cable does not connect to the KVM.

[Blockierte Grafik: https://www.talkford.com/attachments/1723922598558-png.262924/]

The fault may be in a different place, what are your suggestions? For example, could it be a corroded wire or a Y wire bundle?

Thank you in advance for your support and ideas.

Best regards

yabandabiri

Zitat von Go4IT

First of all, welcome to our Forum!

A hard nut to crack... let's see. You already did all the basic stuff to do.

KVM module has two functions, handling the central locking and unlock the PATS (aka drive away release).

The fact that you used IDS (which is of course the best you can have) and it did not find a KVM sounds like this is the root cause of your problems. If this module is broke for some reason, it cannot do both jobs.

Have you tried to start the car using the emergency slot at the steering wheel? This will bypass the KVM and directly comminicate with the BCM. If that works, your keys are know and it is just the KVM not doing the job.

Thank you for your kind welcome.

When I put the key in the compartment under the steering wheel, it does not respond.

Zitat von oldrebel

Some additions, Go4IT

First: to my knowledge, the KVM handles the keyless entry and keyless start and is part of the PATS system. The core central locking is still handled by the BCM. Both modules communicate with each other over that. He said, the central locking worked with the manual key, so the BCM does it's job. This far it looks like the KVM has a problem communicating with the key(s).

Second: Vice versa, he said, he has NO IDS available.

@Threadstarter: What ODB II did you use? Best for this is the free software ForScan on a laptop and a suitable ODB-Adapter to the car. This software can read all codes from all modules.

Third: Yes, he said he used the emergency slot. No success. That is why he thinks about re-initializing the keys to the car.

@Threadstarter: very basic question: how trustworthy is the car battery? When the voltage goes to low, the electronic modules may malfunction because of that.

Alles anzeigen

Hello,

I have this device, ELMII Pıc18f25k80 Ft232rl Hs/Ms Can device. I was also able to connect to the vehicle with Forscan software. I was able to read the fault codes. However, there was no fault record.
I charged the vehicle's battery, but I did not get a result and changed the battery. Unfortunately, the result did not change.

Zitat von Go4IT

You where right oldrebel, i haven't read carefully enough, thanks for the corrections.

If he could open the doors using the emergency blade inside the key, isn't that purely mechanic? So it will trigger the central locking to open all doors and of course the hazard lights will acknowlegde this. If the car could not be opened by pressing the remote fob, usually there is something wrong with the key (battery low or a signal yam in the air).

But what puzzles me more is that in his video there is not reaction on pressing the POWER key. Usually convers shows a "key not detected" message, but here we see nothing. Looks like the key has not effect. So even if we imagine the key programming is lost (which is extremely unlikely) the car would react on pressing the power button.

I never tested what happens when the KVM is off/broke, but as it is part of PATS the car won't start. But this usually shown as a warning in the cluster panel.

Not that only something bad happens to the power knob? yabandabiri have you measured the voltage of the battery? Some modules won't wakeup if that is too low.

Yes, as I said, I charged the car's battery and even changed it. It didn't respond. We looked in many places but couldn't get a result. The wiring is very complicated and there are dozens of wires from the front to the back of the car. I think there is a problem with one of them. For this, it will be necessary to remove the seats and the carpet and check them one by one.

I need a mechanic like the ones in these videos But there is no such service around me.
It's not the same fault but it's quite evocative.

Video1

Video2

Zitat von Ossi

Hat irgendeiner den StartButton getestet?

I couldn't understand exactly what you wanted to say.

I didn't change the button because the car doesn't respond at all. I don't think the button is broken. If the doors are unlocked with the remote control, the car starts.

Zitat von Endurance

Before working on the loom / wire harness, I propose to check first KVM module and receiver for unlocking via remote control.
The receiver is located at no. 1 on this page: #12

Thema

RDKS/TPMS Grundlagen

In diesem Thread werde ich mir mal das Reifendruckkontrollsystem vornehmen und versuchen seine Geheimnisse aufzudecken.
Dabei geht es in meiner Grundlagenforschung darum wie die dahinterliegende Technik funktioniert, nicht wie man es freischaltet und dergleiche. Darüber gibt es genug Threads. Natürlich hoffe und freue ich auf euren fachlichen Input und Kommentare

Funktionsweise
Grundlegend arbeitet dieses System so, das in den Reifen verbaute Sensoren laufend Meßwerte ermitteln und per Funk an…

Go4IT

19. April 2017 um 14:09

Is there maybe water entry by the antenna connection, or bad connection at all?

In another thread a member found out how to set "ignition on" for the BCM with an additional wire at the BCM connector.
Reason was to get "ignition on for frogramming with Forscan" for a car without a real key.
Maybe with this "ignition on" you can check if you can reach the KVM. If not, I assume that the KVM has a breakdown.

Beitrag

RE: Reifendruck-Kontrollsystem ("RDKS" bzw. engl. "TPMS") im FL nachrüsten

Heute nun die versprochene Rückmeldung meines Umbaus. Vornweg: es hat alles funktioniert, ich hab mein BCM getauscht und nun org. RDKS. Ich konnte den BCM Tausch heute erfolgreich in 3 Stunden mit Elmconfig und Forscan erledigen. Die Antennen vorn und die Leitungen + Antennen hinten hatte ich bereits im Mai nachgerüstet, die CCC vor 14 Tagen gesichert, kopiert und die Kopie um RDKS erweitert.

Ich hab ja einen Mondeo vFL mit Keyless Go und damit das Problem mit "Zündung an". Beim Studium der…

BBG-AE185

4. November 2023 um 19:25

In #37 it's told that it was pin 15 of C connector (blue one).

Good luck!

Thanks for all the information.

I removed the antenna and it was under the ceiling light. No problems were seen. When the antenna fails, doesn't it do manual operation from the compartment under the steering wheel? It also didn't give the message "key not detected".

There is a circuit diagram in message #37. Is there a source where I can see the entirety of this?

Zitat von Go4IT

Please read out CCC from IPC and BCM and post it here (i suggest using ELMConfig for this instead). If there is a Keyless configured, no matter what you do, the must be DTCs if that module is missing.

But yes, one way to get more results is to bypass Igntion on. One way was shown in the post, the other is to send IGN on CAN Bus. Yould be done with your adapter and a Terminal program.

I took the vehicle to an unauthorized Ford service.

They replaced it with a used KVM because it did not communicate with the KVM during the checks. After the change, it gave the error "Key Not Found" on the screen. However, they could not identify the keys and are trying.
It was not even giving this error before. It seems that the KVM is faulty, but the final result will be clear after the keys are introduced.
If there is any development, I will definitely let you know from here.

Thank you all for your help.

This is my vehicle's original KVM.

This is the KVM that was installed later.

Hello friends, after a long time we found the fault.

All the wiring was checked and no fault was found. Unfortunately I could not find the same KVM module. I decided to have it repaired. I took it to a friend of mine who is very good at this (electronic repair). Checks were made. He detected a cold solder and a capacitor fault. He renewed the solders of the entire circuit and replaced the capacitor. Bingo, the vehicle is now working (20 days).

I would like to thank you for your support and ideas. I definitely wanted to come here and write about the cause of the fault. Maybe it will be useful to someone else one day.

I am adding the photos I took before the fault and during the repair below.

Before

After