VW Jetta — No Start, No Communications

Jeff Owner/Technician Flesherton, Ontario Posted   Latest   Edited  
Updated
Electrical
Network Communications
2002 Volkswagen Jetta TDI 1.9L (ALH) 5-spd (02J)
No Communication
Crank / No Start

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 

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Joseph Owner/Technician
Waukesha, Wisconsin
Joseph Default
   

Check the ground under the battery. Otherwise the fuse block above the battery is a very common failure point.

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Jeff Owner/Technician
Flesherton, Ontario
Jeff Default
 

10-4

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Chad Mobile Technician
Eustis, Florida
Chad Default
 

Do your fuses have power?

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Jeff Owner/Technician
Flesherton, Ontario
Jeff Default
 

Yes at the door jam fuse block and the battery fuses

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Maynard Technician
Elmira, Ontario
Maynard Default
 

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!

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Micah Owner/Technician
Bainbridge Island, Washington
Micah Default
 

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.

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Laird Owner/Technician
Waverley, Nova Scotia
Laird Default
 

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

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Leon Owner/Technician
Ashby, Massachusetts
Leon Default
 

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.

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Jim Technician
Cameron Park, California
Jim Default
 

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.

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Hans Diagnostician
Salt Lake City, Utah
Hans Default
 

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…

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Bill Owner/Technician
Jackson, Michigan
Bill Default
 

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.

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Tommy Technician
Pittsburgh, Pennsylvania
Tommy Default
 

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?

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Jeff Owner/Technician
Flesherton, Ontario
Jeff Default
 

Yes start and stall .

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Tommy Technician
Pittsburgh, Pennsylvania
Tommy Default
 

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.

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Jeff Owner/Technician
Flesherton, Ontario
Jeff Update
 

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…

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Bill Owner/Technician
Jackson, Michigan
Bill Default
 

ODIS (VW factory tool) will be necessary if old cluster is unresponsive

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Frank Owner/Technician
Toronto, Ontario
Frank Default
 

Is the ecu under the cowling?

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Randy Diagnostician
Glendora, California
Randy Default
 

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

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