Glow plug control module part # help

chonchibelly

Member
Joined
Oct 13, 2013
Location
alaska
TDI
'98 jetta
Can anyone help me find the part number (or point me to where I can) for the glow plug control module/fuse for a 1998 Jetta tdi A3? This is the part mounted at the top of the firewall in front of the drivers seat. It doesn’t seem to exist in the parts diagrams and a couple of online parts places don’t know what I’m talking about. It has melted and needs to be replaced. Let me know if I can provide any more info. Thanks.
 

oilhammer

Certified Volkswagen Nut & Vendor
Joined
Dec 11, 2001
Location
outside St Louis (where it's safe)
TDI
There are just too many to list....
The AHU's glow control module (relay) is 038-911-253 but I have a feeling that is not what you are talking about.

Most VAG parts have part numbers on them (if you can still read it). Maybe post a picture.
 

chonchibelly

Member
Joined
Oct 13, 2013
Location
alaska
TDI
'98 jetta
The AHU's glow control module (relay) is 038-911-253 but I have a feeling that is not what you are talking about.

Most VAG parts have part numbers on them (if you can still read it). Maybe post a picture.
Ya, sorry. It’s not the relay. So I guess not the ECM. Just the fuse unit that’s mounted on the firewall. I will try to grab a photo shortly.
 

oilhammer

Certified Volkswagen Nut & Vendor
Joined
Dec 11, 2001
Location
outside St Louis (where it's safe)
TDI
There are just too many to list....
Outside the car or inside the car? This IS a TDI, correct, not a turbodiesel? You are in Alaska, and while they did not sell the AAZ turbodiesel in the US, they did sell them in Canada, and some have found their way here, and presumably even more likely there.
 

MOGolf

Top Post Dawg
Joined
Jun 27, 2001
Location
underneath something
TDI
2001 Golf GLS TDI Reflex silver, rough road suspension and steel skid plate, 2004 Passat Variant, Candy White, rough road suspension and geared balanced shaft module, and much, much more. 2016 LR RR HSE TD6, 2019 Jaguar I-PACE
Is it the control module for coolant glow plugs? 191 911 261 B.
Or the 50A strip fuse for it? N 017 125 1
 

chonchibelly

Member
Joined
Oct 13, 2013
Location
alaska
TDI
'98 jetta
Ye
Is it the control module for coolant glow plugs? 191 911 261 B.
Or the 50A strip fuse for it? N 017 125 1
Yes! The coolant plug control module. Thank you. Looks like it’s no longer available...anywhere. Wonder what I’m suppose to do about that? The car would not start (no crank) until I cobbled it together as best I could. It apparently needs to be replaced.
 

Matt-98AHU

Loose Nut Behind the Wheel Vendor
Joined
Apr 23, 2006
Location
Vallejo, CA
TDI
2014 Passat SE DSG, 2005 Passat wagon, 2004 Touareg V10.
Ye


Yes! The coolant plug control module. Thank you. Looks like it’s no longer available...anywhere. Wonder what I’m suppose to do about that? The car would not start (no crank) until I cobbled it together as best I could. It apparently needs to be replaced.
As others have said, that fuse is simply for the coolant glow plugs. There are numerous cars running around with that module and fuse melted and no longer operational. It will have zero bearing on your ability to be able to start the car. It's something that is only used to help the car warm up faster in cold climates AFTER the engine has started.

If your car suddenly cranked where it wouldn't before you fiddled with it, I call that a coincidence, not an indication of that being the source of the issue.

Even the actual glow plug circuit (which is on the relay panel inside the car, not the melted bit on the firewall under the hood) has no bearing on if the car can crank or start.
 

chonchibelly

Member
Joined
Oct 13, 2013
Location
alaska
TDI
'98 jetta
As others have said, that fuse is simply for the coolant glow plugs. There are numerous cars running around with that module and fuse melted and no longer operational. It will have zero bearing on your ability to be able to start the car. It's something that is only used to help the car warm up faster in cold climates AFTER the engine has started.

If your car suddenly cranked where it wouldn't before you fiddled with it, I call that a coincidence, not an indication of that being the source of the issue.

Even the actual glow plug circuit (which is on the relay panel inside the car, not the melted bit on the firewall under the hood) has no bearing on if the car can crank or start.
Ok. Thanks for the explanation. Unfortunately, now I have no idea why the car would not crank. Is there any way that there could be anything associated with that wiring that could cause the no crank issue? My glow plug dash light was not illuminating.
 

Matt-98AHU

Loose Nut Behind the Wheel Vendor
Joined
Apr 23, 2006
Location
Vallejo, CA
TDI
2014 Passat SE DSG, 2005 Passat wagon, 2004 Touareg V10.
Ok. Thanks for the explanation. Unfortunately, now I have no idea why the car would not crank. Is there any way that there could be anything associated with that wiring that could cause the no crank issue? My glow plug dash light was not illuminating.
Glow plug dash light not illuminating is a symptom of the engine computer itself not being powered on, which sometimes can be from a dud relay 109/J317 power supply relay to the engine computer.

When you first turn the key on, you should get other warning lights on the cluster too, like the oil pressure light and battery light, for example. Are those also coming on when you have the no-crank issue that also doesn't have the glow plug light or check engine coming on? Does the ECU ever store a code for the glow plug light intermittently not working?

It's very plausible you have an intermittent ignition switch issue.
 

Matt-98AHU

Loose Nut Behind the Wheel Vendor
Joined
Apr 23, 2006
Location
Vallejo, CA
TDI
2014 Passat SE DSG, 2005 Passat wagon, 2004 Touareg V10.
Ugh, yeah, the A3's ignition switch....
Had a B4 Passat in here awhile ago that had a Meyle key tumbler... the crescent shaped bit that engages the switch had gotten tweaked with use to the point where it would not reliably mechanically turn the switch far enough to actually get to the start position... That was fun figuring out after first replacing the switch and still having the same issue... heh
 

chonchibelly

Member
Joined
Oct 13, 2013
Location
alaska
TDI
'98 jetta
Glow plug dash light not illuminating is a symptom of the engine computer itself not being powered on, which sometimes can be from a dud relay 109/J317 power supply relay to the engine computer.

When you first turn the key on, you should get other warning lights on the cluster too, like the oil pressure light and battery light, for example. Are those also coming on when you have the no-crank issue that also doesn't have the glow plug light or check engine coming on? Does the ECU ever store a code for the glow plug light intermittently not working?

It's very plausible you have an intermittent ignition switch issue.
I did get the other warning lights illuminating. I’m fairly certain that the glow plug light was the only one.

I do get the glow plug light illuminating now that it is starting, but it only comes on for a second or two despite it being 45 degrees out. And it seems to lead to a rough start.
 

Matt-98AHU

Loose Nut Behind the Wheel Vendor
Joined
Apr 23, 2006
Location
Vallejo, CA
TDI
2014 Passat SE DSG, 2005 Passat wagon, 2004 Touareg V10.
I did get the other warning lights illuminating. I’m fairly certain that the glow plug light was the only one.

I do get the glow plug light illuminating now that it is starting, but it only comes on for a second or two despite it being 45 degrees out. And it seems to lead to a rough start.
That's normal. Glow plug light should not stay on for longer than its bulb check until you get below about 40 degrees F. And, even though the light goes off quickly, that does NOT mean the glow plugs have turned off. It just indicates that it is good enough to start. You can let it sit for a few more seconds if it helps and the plugs will actually still be on.

If the car fails to crank, it can be the ignition switch still... or even something wrong with the key tumbler that interfaces with the switch.
 

chonchibelly

Member
Joined
Oct 13, 2013
Location
alaska
TDI
'98 jetta
Glow plug dash light not illuminating is a symptom of the engine computer itself not being powered on, which sometimes can be from a dud relay 109/J317 power supply relay to the engine computer.

When you first turn the key on, you should get other warning lights on the cluster too, like the oil pressure light and battery light, for example. Are those also coming on when you have the no-crank issue that also doesn't have the glow plug light or check engine coming on? Does the ECU ever store a code for the glow plug light intermittently not working?

It's very plausible you have an intermittent ignition switch issue.
And I meant to add...yes. The check engine light has been on intermittently since Ive owned the vehicle. It’s been several years since I’ve retrieved the code so I don’t recall the number. But I believe it was a general “check glow plug system” type of code. Plugs are all good, harness has been replaced, etc.

So, otherwise, I’m assuming I should just replace the 109 relay (is J317 the same?) and see if it ever happens again? I believe I have rather recently replaced the ignition switch. Thanks again!
 

oilhammer

Certified Volkswagen Nut & Vendor
Joined
Dec 11, 2001
Location
outside St Louis (where it's safe)
TDI
There are just too many to list....
As Matt said, there are some low quality ignition switches out there. Volkswagen has a newer updated version, they are still available, and while they may cost $60 instead of 6, they are worth every penny since they will actually work reliably.

6N0-905-865
 
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