What is the real purpose of Relay 180?

[mStrad]

Hi All

I bought a vanagon with a transplant TDI from a 97 jetta. The glow plug circuit has only been wired with the 4 pin J52 relay. In my research I discovered that the intended design also included a 7 pin relay stamped 180 (oem part 038 911 253). Can someone shed some light on what the relay 180 is supposed to do? Does it modulate voltage to the glow plugs? Its not in any of the pinout wiring diagrams. I have a ECU pin out and it only shows the J52 relay. I'm just trying to learn how the intended design was supposed to work.

Thanks

 

[Fabbie]

Hi All

I bought a vanagon with a transplant TDI from a 97 jetta. The glow plug circuit has only been wired with the 4 pin J52 relay. In my research I discovered that the intended design also included a 7 pin relay stamped 180 (oem part 038 911 253). Can someone shed some light on what the relay 180 is supposed to do? Does it modulate voltage to the glow plugs? Its not in any of the pinout wiring diagrams. I have a ECU pin out and it only shows the J52 relay. I'm just trying to learn how the intended design was supposed to work.

Thanks

Iam trying figure this out as well, i have mk4 jetta 1999 alh tdi 1.9, has same shape of models 2000. My glow plug light doesn’t come on . Tested the circuit, those relays on top of battery are fine. Eletricity seems not coming to glow plugs somehow, i have no idea what is going on. I curse this vw all the time. Always something wrong . Electric portion on these cars always have some issue. Lets help each other with some info. Iam still trying figure out

 

[Tdijarhead]

Does the car start? A dead 109 relay symptoms are no glow plug light and endless cranking but no start. The 109 relay supplies power to the ecu.

Relay 109 (A4)(B4)(A3)

Relay 109 is the main power supply relay for A3/B4, and A4 TDIs with the ALH engine. When it fails the engine will crank but not start. Sometimes they fail intermittently. Most TDI owners like to k...

www.idparts.com

 

[mStrad]

Find out if you have the big relay 180 under the dash or the 4 pin relay in the relay box inside. Replace them one at a time. If that still doesn’t fix it you can just return them for a refund. Also check the 50 amp fuse that is connected to the glow plug circuit.

 

[bikeprof]

50AMP fuse is very well in oversight many times for many years/miles,
so check that one first !

After I replaced the 50 AMP, ground connections became what they should have been, started easier/faster.
That also helped glow plug system...