08 Q7 Won’t start
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AudiWorld Junior Member
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08 Q7 Won’t start
I never had a problem with it. Drove the car from school to home and parked it on Friday I try to turn it on sat evening and it won’t turn on or anything I thought it was the battery so if charged it. I try again nothing the key turns but nothing car does not run the fuel pump on anything the only thing that is on is the radio and that’s it. Nothing on dash turns on.
Link to video of what’s happening. https://youtube.com/shorts/Tvq43VqZaBE?si=bMHu9ZLbm56o7mT-
Link to video of what’s happening. https://youtube.com/shorts/Tvq43VqZaBE?si=bMHu9ZLbm56o7mT-
AudiWorld Super User
Joined: Jan 2021
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From: USA - NM
Sorry to hear of your issue, but it's not an uncommon one as these age...lot of electronics on these Q7s.
When you turn the key in ignition, and then absolutely nothing on the dash lights up, then usually that indicates there is:
A dead-dead battery problem...or perhaps a blown major fuse or ignition switch failure...it's a switch, after all.
A problem with the security module/start authorization system will also NOT allow the ignition switch to function normally (light up dash w/warning lamps check/start car). This particular issue is one that is known to give no warning whatsoever, whereas with an ignition switch problem you'll generally have some indication it is going out long before it actually fails.
Notably, your radio still functions, which is very positive sign that the ignition switch is good, and it is just the security authorization system/module that's your problem...most likely. Always best to scan this car for fault codes to avoid throwing parts at a problem, if you have a scantool available, as that will direct you to the location of the fault(s).
If you go look up/search for Audi Q7 No Crank, No Start then you'll find some example videos/threads, etc., on this topic to help you out.
When you turn the key in ignition, and then absolutely nothing on the dash lights up, then usually that indicates there is:
A dead-dead battery problem...or perhaps a blown major fuse or ignition switch failure...it's a switch, after all.
A problem with the security module/start authorization system will also NOT allow the ignition switch to function normally (light up dash w/warning lamps check/start car). This particular issue is one that is known to give no warning whatsoever, whereas with an ignition switch problem you'll generally have some indication it is going out long before it actually fails.
Notably, your radio still functions, which is very positive sign that the ignition switch is good, and it is just the security authorization system/module that's your problem...most likely. Always best to scan this car for fault codes to avoid throwing parts at a problem, if you have a scantool available, as that will direct you to the location of the fault(s).
If you go look up/search for Audi Q7 No Crank, No Start then you'll find some example videos/threads, etc., on this topic to help you out.
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AudiWorld Junior Member
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Battery is charged fully.
[QUOTE='10Q7TDI_Prestige';25979274]Sorry to hear of your issue, but it's not an uncommon one as these age...lot of electronics on these Q7s.
The battery is charged fully and also when I plug in scan tool it won’t read the car since the car won’t even wake up or anything.
The battery is charged fully and also when I plug in scan tool it won’t read the car since the car won’t even wake up or anything.
AudiWorld Super User
Joined: Jan 2021
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From: USA - NM
Yup. I watched the video clip; it just wasn't clear if power supplied to the diagnostics port with key turned on since you do have the basic calendar/time/date/ mileage markers lit on dash, and it obviously is allowing power to myriad 'background items', which is why I suspect it relates to the authorization/security module issue. Go look up via internet search to match up your specific symptoms and see if it matches the authorization module failure or not. There's a similar issue related to the steering lock solenoid/microswitches, etc. failing, and IIRC, there's a workaround for that one.
It could just be something stupid simple too.
Here's a link to FUSE & RELAY locations on the Q7, which may come in very, very handy, so be sure to bookmark it :
https://fuseandrelay.com/audi/q7.html
It could just be something stupid simple too.
Here's a link to FUSE & RELAY locations on the Q7, which may come in very, very handy, so be sure to bookmark it :
https://fuseandrelay.com/audi/q7.html
AudiWorld Super User
Joined: Jan 2021
Posts: 4,567
Likes: 1,456
From: USA - NM
Here's what is most likely going on with your Q7, and this video walks you through how to get the car to allow you to scan it (time stamp 5:45), which was likely in the prior video also, but here it is again, and this video is an older Q7 just like yours, and this is the DIY fix walk-through. This guy edits poorly and talks a LOT, so bear with it. You can probably skip ahead to 3:45 time stamp, and not miss a thing:
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