VW Jetta — No Start, No Communications
Asking for help again. This 2002 Jetta was dropped off at our shop for suspension work. We went to bring it in the shop and the battery was dead. Charged the battery and we have a no start. Engine will kick momentary but never fires up.Tthis problem has never happened to the customer before, Scan tool will Only communicate with abs module, instrument cluster is dead only lights up the battery light. Struggling to find information for this vehicles theft system and the instrument cluster. Vehicle seems to be locked out for some reason. Have tried disconnecting the battery terminals. Any one been down this road before? Thank you in advance
Check the ground under the battery. Otherwise the fuse block above the battery is a very common failure point.
Do your fuses have power?
Yes at the door jam fuse block and the battery fuses
Was down a road like that a very very long time ago, with the no start, not sure about the communication issue. However it was in theft lockout. I believe we had to leave the key on for like 2 hours, battery charger on, to let the theft time out. Not even sure if it was then just crank and start or if it was key off after the 2 hours then start Good luck!
You can try disconnection both battery terminals and touch the cables together. We have had luck fixing strange electrical issues before by doing that. It is what we call a hard reset for all the computers.
I had the same problem before on one of those. Disconnecting the battery cables and holding them together for 15 seconds fixed it. It is called a logic lock and it is like a reboot for the computers
I used to drive tow truck for AAA, a common fix For this issue was to give it some gas and see if it will fire and run...if it died right after letting off, I would then turn the ignition key in any one of the door lock cylinders or trunk lid to disable the security. Then try again. It usually would fire and run no problem. I hope this helps.
Had a jump box hooked up backwards and popping one of the 3 main fuse bolted in on the fuse block under the hood. Comes in a complete unit with 3 or 4 fuse integrated together. Simular issue could connect to one module. Half the car had power.
wiki.ross-tech.com/wiki/index.php… might have some more detailed information on the immobolizer. That should have a little car with a key light flashing on it if the immo is active. That car has immo3. I have actually had the immo activate on a Mk4 after the battery died, but has only happened to me once, and I believe the rest of the car was fine. No…
Charge the battery then close the hood - Try locking / unlocking the door using the key cylinder. Try both driver and passenger side. I have seen this era of VW go into security lock with dead battery before.
Hi Jeff. On those systems the cluster is the gateway and it is the immobilizer. Also is there an aftermarket radio? If so disconnect it. Sounds like a portion of the cluster could be dead. Does it start and stall?
Yes start and stall .
Sounds like the immobilizer has you locked out. Cluster could be causing the no comm and the start stall Sounds like cluster power and grounds is a good start. No sure about pulling the pin without factory tool or maybe autel/auro.
hey all really thank full for you all responding to this post , did a battery disconnect over night with no results , did a 4 hour key on with the battery charger and no results , next step will be to test clusters power and ground supply and the network signals at the cluster , if all test out good we will replace the cluster , if network signal is missing we will start unplugging modules . not…
ODIS (VW factory tool) will be necessary if old cluster is unresponsive
Is the ecu under the cowling?
Had one of these a few years back with dead instrument cluster and now way to pull pin code bought a used cluster and sent ecm to a place in colorado I believe and they were able to delete security function . If you want I will look for the name of the place