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Old 03-13-2019, 05:19 PM   #1
bencpeters
 
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Default Cruise Control Not Working

The Cruise Control on my 2006 Sprinter 3500 isn't working - there is no response when I actuate the switch. After searching the forums, it sounds like people sometimes run into CC issues with brake lights or the pedal brake switch causing intermittent failures, but my brake lights are good, and the pedal switch seems to be actuating fine as well (the CC also isn't intermittent - it just never works).

I've brought it into a mechanic who plugged the diagnostic computer in, and said the ECU was coded for cruise control, but wasn't showing any response at all to the CC stalk. We tried replacing the lever unit, but that didn't fix the problem. The shop thought the only other solution was a full ECU replacement, which is too expensive to be worth it.

Anyone have any other ideas for what might be causing this or ways to troubleshoot? It'd be really nice to have cruise control back!
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Old 03-13-2019, 05:26 PM   #2
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Default Re: Cruise Control Not Working

Quote:
Originally Posted by bencpeters View Post
The Cruise Control on my 2006 Sprinter 3500 isn't working - there is no response when I actuate the switch. After searching the forums, it sounds like people sometimes run into CC issues with brake lights or the pedal brake switch causing intermittent failures, but my brake lights are good, and the pedal switch seems to be actuating fine as well (the CC also isn't intermittent - it just never works).

I've brought it into a mechanic who plugged the diagnostic computer in, and said the ECU was coded for cruise control, but wasn't showing any response at all to the CC stalk. We tried replacing the lever unit, but that didn't fix the problem. The shop thought the only other solution was a full ECU replacement, which is too expensive to be worth it.

Anyone have any other ideas for what might be causing this or ways to troubleshoot? It'd be really nice to have cruise control back!
Fuse, grounds?
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Old 03-13-2019, 05:28 PM   #3
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Default Re: Cruise Control Not Working

As far as I can tell, there isn't a "cruise control fuse"? It seems like a core ECM module... The mechanic who plugged in said that the ECM just wasn't receiving/registering commands from the CC stalk (but we tried replacing that part and it didn't fix the issue).
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Old 03-13-2019, 05:42 PM   #4
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Default Re: Cruise Control Not Working

Assuming that he did use the scan tool live data to check the brake switch operation...
the brake switch has 2 ea. separate sections so the brake lights working of itself is not a total check... and the actual CC switch conditions (the state of the switches is displayed), then it may be worth your time to contact SOS Diagnostics. They repair ECM's, or they may be willing to suggest some other tests/remedies.

vic
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Old 03-13-2019, 08:41 PM   #5
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Default Re: Cruise Control Not Working

Here's the switch's circuit diagram ... note the over-arcing 2nd switch:




I'd at least probe the ECM connector (disconnected from the ECM) with an ohmmeter to verify that the switch closures are getting that far.

--dick
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Last edited by autostaretx; 03-13-2019 at 08:49 PM.
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Old 03-13-2019, 08:43 PM   #6
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Default Re: Cruise Control Not Working

Quote:
Originally Posted by autostaretx View Post
Here's the switch's circuit diagram ... note the over-arcing 2nd switch:



--dick
Interesting. Is there a way to physically/electrically check that over-arching second switch? Is it internal to lever module (which we've tried replacing), or is it somewhere upstream of that?

Thanks!
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Old 03-13-2019, 09:13 PM   #7
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Default Re: Cruise Control Not Working

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Originally Posted by bencpeters View Post
Interesting. Is there a way to physically/electrically check that over-arching second switch? Is it internal to lever module (which we've tried replacing), or is it somewhere upstream of that?
I had updated that post with a short note below the drawing.

If you replaced the level module, how did you handle (or achieve) the connection to the ECM?
(a) cut and spliced the wires
(b) did the exercise of removing the connector pins and inserting the new ones (rare, possibly harder than (a), even with the right tools)

Either way, i'd still ohmmeter it.

Pin 7 to pin 32 should show a connection ... when you press the lever in any direction.
Otherwise it's open.
The other pins should reflect where you're pushing the lever.
Pin 7 is the "common" for all of the switches, and i note that the schematic (more than) hints that there are resistors in the game as well (on the 4 directional switches, but not on the 7-to-32 switch).

Note that the "off" direction is connected *when at rest* ... when you push towards "off", that switch should open. Therefore "open" on that switch means "turn off CC".

If it doesn't close when the switch is not being pressed, no other switch will be honored (i'd suspect).

By using resistors in the circuit the ECM should be able to detect "pressed" versus "short to ground" and/or "short to +12v"

--dick
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Get YOUR Sprinter's full configuration datacard by entering your VIN to https://www.datamb.com/
http://diysprinter.co.uk/reference <-- lots of service documentation, Thanks to Jens Moller and Arnie_Oli
((as always: this post may go through a couple of post-posting edits... so maybe give it ten minutes before commenting))

Last edited by autostaretx; 03-13-2019 at 09:20 PM.
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Old 03-13-2019, 09:50 PM   #8
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Default Re: Cruise Control Not Working

Quote:
Originally Posted by autostaretx View Post
If you replaced the level module, how did you handle (or achieve) the connection to the ECM?
(a) cut and spliced the wires
(b) did the exercise of removing the connector pins and inserting the new ones (rare, possibly harder than (a), even with the right tools)
For the lever, we just took apart the steering column and plugged the new lever module into the wiring connector - it's just a 6-wire plastic connector.

I've used a multi-meter on the switch we took out, and it checks out fine - the verification switch shows a connection on all 4 lever actuations, open the rest of the time. Off is connected at rest, connection goes away when pushed.

We've actually tried out 3 different switches at this point (the stock one the van came with, one we ordered off a parts website, and one the mechanic had at the shop) with no luck, so I think it's quite unlikely it's the switch module. Is there some other portion of the wiring we could check?
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Old 03-13-2019, 11:20 PM   #9
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Default Re: Cruise Control Not Working

The one other "normal" thing that can cause no-cruise is the Crash State.

That's triggered if you hit something hard enough (post in parking lot?) to convince the SRS system that a crash is starting to happen.
(it will also prevent the electronic locks from locking, even from the dashboard switch <-- 2nd symptom to look for)

That Crash State shows up on a reasonable scanner.

Otherwise, it's the usual litany of check the wires (and use the ohmmeter at the ECM connector)
The wiring diagram shows colors, so a cable exists somewhere (after all, adding CC after-the-fact involves pushing new pins into the ECM connector.) Sometimes one of those pins just works its way that teeny tiny bit loose.


--dick (who's well on the way with agreeing with your mechanic)
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2005 T1N 118" Freightliner 2500 Passenger Wagon (2.7L, 15" tires, standard (short) roof)
Get YOUR Sprinter's full configuration datacard by entering your VIN to https://www.datamb.com/
http://diysprinter.co.uk/reference <-- lots of service documentation, Thanks to Jens Moller and Arnie_Oli
((as always: this post may go through a couple of post-posting edits... so maybe give it ten minutes before commenting))
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Old 03-14-2019, 02:14 AM   #10
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Default Re: Cruise Control Not Working

Quote:
Originally Posted by autostaretx View Post
The one other "normal" thing that can cause no-cruise is the Crash State.

...
Good point.

One hint.
If the remote locks are still operable, the Crash State in not likely involved.

Has there ever been mention of DTC's that are related to the Crash Lockout? Otherwise it will likely take a good scan tool to reliably reveal that information.

Question.
Quote:
Originally Posted by bencpeters View Post
The Cruise Control on my 2006 Sprinter 3500 isn't working - ...
Did it ever work, or was it recently added?

vic
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DAD NAS (N. Amer. Spec) 2004 140 2500 >330,000+ mi. Arctic Whitewash Brush-tone Grey
2006 Freightliner 140 2500HC >183,000+ mi. Arctic Whitewash (Spotted Snow Leopard accents)
"My opinion and worth everything you'll never pay for it." assumed.
Anyone can hold the helm when the sea is calm. Publilius Syrus
"There are only 10 types of people in the world: Those who understand binary, and those who don't." HaWiiLuVeR
16 ounces of unnecessary prevention can be worth a pound of manure.

Last edited by Aqua Puttana; 03-14-2019 at 02:16 AM.
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