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Re: "SRS-AIRBAG SERVICE" fault message
You don't just want to reset it you want to find out what the fault code is, without knowing you could be indangering your life and someone else's . The light is there to tell you something is wrong. that year of car has a type 2 air bag system. Go to this web page and they canhelp you pull the code to see if it is dangrous or not.thanks for using fix-ya and please rate if thishelped.
I have the SRS airbag urgent message.The same thing happened to me with all the gauges and the back lighting going out.
I checked fuses and checked all connections also checked all voltages. All looked good. Next I checked the passanger seat for function. Not working. So I checked the worm gear track, all connections and power. All good. Next I checked the the seat buttons and seat belt. That was the money. The dry contacts where loose or dirty in the seat belt latch. Cleaned and tightened. Everything in the car is working in normal operations. But the SRS airbag urgent alarm is still on. I read on one of these forums that it will take 1500 miles on the car to clear the alarm. Not sure if that's true. We will see. I hate dealerships and I believe there just part changers and shooting from the hip trouble shooting. Just my opinion.
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The only one you can reset is the "time for regular service" message.
To reset this, turn ignition off, hold the trip reset button down and turn key to position II. Keep holding the trip reset until you hear a ping noise and the orange triangle flashes. Immediately release the trip reset and turn the ignition off. When you start the car next, the message will be gone.
Other messages like "SRS Service required" or "Alarm system service required" can only be rest with a OBD code reader.
Most common SRS fault in XC90's is the driver side SIPS bag (side air bag) located in the side of the seat. The wire runs close to the hinge for the backrest and after working back and forth can break or short.
If you have SRS and "brake failure" it should be taken to a dealer. a shadetree mechanic will screw more up than he will fix in this case. trust me on this! you will pay a price, but will save you more $ and less headache in the longrun.
What you are experiencing in one way or another is a low (all functions inside the passenger cabin) or high speed (engine compartment) network failure. But before I get to far into it you need to understand how the Volvo works and don't worry I will keep this as lamen as I can.
The 1999 and new Volvo's work on a network, (CAN network) think it of a a bunch of computers in an office that share a printer. Well, depending on the year of your Volvo you could have up to 20 plus computers or ECU's. The reason that such technology is on your car is siimple: The average car today carries over 400LBs of wiring that runs to and fro through out the car. This weight is no longer acceptable and if not stopped could easily make up over half the weight of the car to give us the comfort features we want.
Don't panic yet, Volvo didn't just stuff that many ECU's in a car without a diagnostic solution just in case something went wrong. Now, since these ECU's have information that needs to be shared over the car there needs to be a boss of that information. Think of 20 people in one room all talking at once, everyone is talking but no one can hear. With me so far?
So, Volvo put what is called a CEM which stands for Central Electronic Module to 'run' things. It's job is to monitor and regulate all communication on board the vehicle, with out it there would be anarchy!!
How to they talk to each other?
Two wires are run between each ECU (LAN Cables if you wish) which pulse voltage up and down to give it's ECU's information package when it's that particular ECU's time to 'speak'. The CEM controls who speaks and when. If one ECU speaks out of turn then the ECU who's turn it was to speak is silenced. If this happens to the next ECU on the list and so on here is the anarchy I spoke of. (If you and 20 of your friends were sitting around a room and you each had to say a number higher (126.96.36.199.188.8.131.52.184.108.40.206.220.127.116.11.6) than the person to you left and the one person just kept shouting their number the cycle would break down.
The CEM would then instruct all ECU's to shut down since there is no point to speak with the loud mouth in the room. This is example is a babbling node (ECU). Since the on board's information is transmitted using voltages then any disruption or damage to the signal will cause the network failure. Short circuits, either to power or ground, would stop that electrical signal although shorts to ground is the most common.
If the dash is going dead, you should see the SRS light/message come on first then the gauges drop off then the total death of the display.
High speed failures will show as the ABS/TRACS failure message then RPM and engine temp fail but the rest of the DIM will stay on.
You really need to take this to the dealer and the dealer ONLY!! They have computer (VIDA) that can run the necessary diagnostics to determine where the problem may lie. If the fault is permanent then it is relative easy to find and fix. If it happens every now and then it is quite difficult to find. But, if your technician says it's a computer right off the start then he is guessing and you should get a guarantee that if the computer replaced does not fix the problem then you will not pay for it.