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Go Back   TDIClub Forums > TDI Model Specific Discussions Areas > VW MKIV-A4 TDIs (VE and PD)

VW MKIV-A4 TDIs (VE and PD) This is a general discussion about A4/MkIV Jetta (99.5-~2005), Golf(99.5-2006), and New Beetle(98-2006). Both VE and PD engines are covered here.

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Old November 18th, 2018, 15:14   #1
john.bosyj@gmail.com
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Default cruise control not working properly

Ever since I had my Jetta MK4 converted to a manual transmission, the cruise control does not work properly. 1st thing in the morning as I am heading down the highway, the cruise control works perfectly fine. After about 30 minutes, the "reset +" stops working. I can press that button a million times and it will not work. After about 40 minute the cruise control suddenly stops working. Again, I can press the "set -" a millions times and it will not turn back on. When I drive home in the evening, the cruise control is working again and then stops working just like in the morning. Any ideas what could be the problem?
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Old November 18th, 2018, 16:14   #2
robm2
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Could it be temperature related? The buttons perhaps stop working as the interior of the car warms up? Does the "cruise" indicator on the dashboard go out when it quits?

My "cancel" button has stopped working completely. Sometimes, the CC will not work at all, and I find I have to shut the car down to get it to function. Usually, that does the trick.

Have you tried shutting the car off after the CC stops completely, to see if that fixes it?
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Old November 18th, 2018, 18:35   #3
ToxicDoc
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checked clutch switch operation/codes?
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Old November 18th, 2018, 19:13   #4
Vince Waldon
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It can also do that if it sees a series of confusing signals from the two sides of the brake switch.

Quickest thing would be to track down someone with VCDS: you'll then be able to read the operation of all three sets of contacts and at least rule out the easy stuff.

In the absence of that... if all this started *after* the conversion... the clutch switch is the newest player on the field so...
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Old November 19th, 2018, 12:49   #5
john.bosyj@gmail.com
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Maybe I'll try driving to work with the heat off to see it it makes a difference The light on the dash stays on when it stops working. I tried shutting off the car to see it it will work normally and it doesn't.

There have been times that I could drive without ever touching the brake pedal or clutch and the CC still shuts down after 30-40 minutes. Could it still be the clutch switch or brake switch that can cause two separate issues with the CC- one being the reset + and the other being the set-. When I had the conversion done, they did need to do something with the ECU. I'm wondering if that is the problem. Thanks
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Old November 20th, 2018, 20:46   #6
wonneber
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Long shot but check fuses 5, 13, and 43
Check for clean and tight connections.
I've read some cheap fuses crack internally and look OK. Maybe open circuit when it heats up?
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Old November 27th, 2018, 12:25   #7
john.bosyj@gmail.com
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So I checked fuse 5,14,43 and all are ok. I also drove to work with the heat turned down and still the cruise control stopped working. I did however notice something. When the cruise control stops working, the horn also stops working. I have a multifunction steering wheel with the cruise and the radio controls mounted on the steering wheel. The radio controls also stop working when the cruise control stops working. Again, this all happens after driving about 30-40 minutes down the highway. Any suggestions?
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Old November 27th, 2018, 12:38   #8
AndyBees
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Do a scan with VCDS to look for DTCs. Scan every system that is supported. Sometimes codes will be where you'd not think they might be and not result in a CEL or flashing GP light.
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Old November 27th, 2018, 20:57   #9
wonneber
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Quote:
Originally Posted by john.bosyj@gmail.com View Post
When the cruise control stops working, the horn also stops working. I have a multifunction steering wheel with the cruise and the radio controls mounted on the steering wheel. The radio controls also stop working when the cruise control stops working.
Maybe scan for codes when the items aren't working.

When the horn stops working check if fuse 40 (20 amps) has power.

Also check if any of the fuses above the battery have no power or have a voltage drop at the clamps on the wires.
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