Incorrect service info?

Steven Mechanic Washington Posted   Latest  
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2004 Volkswagen Touareg V8 4.2L 6-spd — WVGCM77LX4D072084

Here's the service info for installing the airbag control module. Thoughts?

"...Installing

  1. To install, perform the steps used for removal in reverse order.
  2. Switch on ignition.
  3. Make sure that no persons are in the vehicle.
  4. Connect battery.
  5. If the control unit was replaced, it must be coded..."
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Richard Technician
New York
Richard Default
 

I usually skip step 3

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Steven Mechanic
Washington
Steven Default
 

Yeah, I wasn't even thinking of that step, but considering that the battery is under the driver seat, then someone is going to have to at least reach inside the vehicle to connect the battery. The main issue I was concerned with, in case it isn't clear to anyone reading it, is that the directions state to "Switch on ignition" then "Connect battery". Those crazy Germans have some wild ideas or…

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Sergei Mechanic
Oregon
Sergei Default
 

There is no way to switch on ignition without connecting battery. So I think steps are mixed up

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Bill Owner/Technician
Michigan
Bill Default
 

Steve - i checked both ProDemand and OE service information they both state what you posted..... It seems strange to me as well but it may be correct. I do have a vague memory of another car line (i think it was a Chrysler product i was doing air bag work on) saying to have key on when reconnecting the battery

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Steven Mechanic
Washington
Steven Default
 

Interesting. This could be a valid procedure then. If so, I wonder what the reasoning is behind it.

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Steven Mechanic
Washington
Steven Update
 

Thanks to Bill Kenel for mentioning a similar procedure for Chrysler cars. I looked up a 2005 Chrysler 300 3.5L, and found this under airbag system testing... "AIRBAG SYSTEM - With the battery negative cable disconnected, connect the scan tool to the Data Link Connector (DLC). - Turn the ignition key to the ON position, then exit vehicle with the scan tool. - After checking that no one is…

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Chris Technical Support Specialist
New York
Chris Resolution
   

In a training class we were told that the arcing at the battery was less dangerous then an unintended deployment, not sure if that was a Ford Official stance or just the instructors. Either way they want the system powered up without a tech reaching across the Driver's airbag Previous systems showed installing fuses or connecting battery after the key was on like this 05 Explorer: Repowering…

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Steven Mechanic
Washington
Steven Default
 

Ok, so if I'm understanding this right, the airbags could accidentally deploy on power up, either by turning the key on or by connecting the battery, so they would rather have you put the key on first then connect the battery, that way at least you aren't next to the airbags if they deploy. Now I get it. Thanks.

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Stephen Educator
Ohio
Stephen Default
   

Only problem with that is there is a chance the battery could explode from the arc. Not likely, but possible. Safety first. Your right. It does seem a little strange they suggest doing it this the way.

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David Instructor
Indiana
David Default
 

Hi Steve, Agree with other posts regarding the liability reasons for what seems like a typo in the order of operations. It’s prudent to ask though. Typos are rampant everywhere today. USA Today couldn’t even catch a typo in their top headline - misspelling the word Technology in an ADAS article. Lawyers for the OEMs often lack common sense and service manuals are often wrong from the OEM. OEM…

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Steven Mechanic
Washington
Steven Default
 

Trying to decipher service information on these German vehicles is half the job, and yes, they do have typos and confusing translations and just plain incorrect information at times. I'm glad I asked about this particular piece of info because I figured it was wrong, but now I know it is actually correct. �

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Stephen Educator
Ohio
Stephen Default
 

That's what I would do. I would think you would risk more of a chance of a bag deployment having the key on and then turning on the ignition switch. Oh well, what do I know?

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Tommy Owner/Technician
United Kingdom
Tommy Default
 

That has always been the procedure on all VW vehicles as far as I can remember. I believe it is purely for safety reasons during initial power up of the airbag.

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