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Hello All,

The airbag light has come on and stays on - had the diagnostic read done and the code is B1100 - Airbag Sensor Assembly Malfunction.    A read on the forums suggest that it could be "spiral cable" amongst other things that could be the cause of the problem.   Dealer suggested I leave the car with them for a whole day so that the source of the fault can be accurately identified. 

 Any advice  on how to reset this SRS light please ? 

 

Thanks

Tom

 

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Gotta fix the fault first,

By 'spiral cable' I think you'll find that is reference to the 'Clockspring' jumper cable that connects the steering column SRS circuit wiring to the airbag unit itself in the centre of the steering wheel, this cable allows the steering wheel to turn from lock to lock and maintain an electrical connection to the air bag unit. They do fail sometimes but you forum suggestion is a stab in the dark at best! And B1100 -Airbag Sensor Assembly Malfunction  would not point me towards the clock Spring jumper cable!

 

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2 hours ago, Texas said:

Gotta fix the fault first,

By 'spiral cable' I think you'll find that is reference to the 'Clockspring' jumper cable that connects the steering column SRS circuit wiring to the airbag unit itself in the centre of the steering wheel, this cable allows the steering wheel to turn from lock to lock and maintain an electrical connection to the air bag unit. They do fail sometimes but you forum suggestion is a stab in the dark at best! And B1100 -Airbag Sensor Assembly Malfunction  would not point me towards the clock Spring jumper cable!

 

That's the general idea. 🙂.  I was referring to

  Without testing the clockspring it would be impossible to rule that out.  As you probably know it is one of many  inputs to the Airbag sensor assembly.  What else would the B1100 point you to  ? 

 

 

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More info here and I did read somewhere else that as the assembly was located in the central consul area a spilt liquid from the cup holder was responsible for throwing up this fault!

http://4runnerclub.com/i/4r_files/fsm/ToyManuals-2007-4Runner/toyfsrm/07toyrm/07toypdf/07rmsour/4runnerr/0440031.pdf

 

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On 2/22/2019 at 7:08 PM, Texas said:

More info here and I did read somewhere else that as the assembly was located in the central consul area a spilt liquid from the cup holder was responsible for throwing up this fault!

http://4runnerclub.com/i/4r_files/fsm/ToyManuals-2007-4Runner/toyfsrm/07toyrm/07toypdf/07rmsour/4runnerr/0440031.pdf

 

Thanks Paul for the link.

 I have had a chat with the dealership who did the initial diagnosis. They said they cannot recollect a single incident when the Airbag Sensor Assembly had to be replaced and are convinced that something else is at play here. They want to do further diagnosis so the car will be going back to them. 

Thanks

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If the clock spring is responsible for an air bag fault. The code issued is usually a squib circuit code, and this code would point to the steering wheel air bag squib circuit.
Squib circuit codes run from B0100 up to B0138 these codes are for open, and short circuit for each air bag and for seat belt pre-tensioners.

The code B1100 does indicate a fault in the sensor assembly.

John 

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Thanks John,  I requested the garage ( aka dealer ) to get straight to the point (i.e getting to the airbag sensor assembly and doing the appropriate checks on it ),however, they are saying that there are a lots of other things ( alternator charging circuit / bad ground / wiring faults etc ) that could be causing this and they have to rule out all these other things before attempting to access the airbag sensor assembly. The impression I got is that It could take them some time  to get to the bottom of this.   😞

Not sure if this helps but apparently  the car had an issue with water ingress ( which has been fixed )

 It looks like I may have to search for an independent specialist in Lincolnshire / Nottinghamshire  who is familiar with old(er) Lexus models for a second opinion .  Any suggestions would be appreciated. 

Thanks Again

 

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On 2/26/2019 at 4:07 PM, Britprius said:

If the clock spring is responsible for an air bag fault. The code issued is usually a squib circuit code, and this code would point to the steering wheel air bag squib circuit.
Squib circuit codes run from B0100 up to B0138 these codes are for open, and short circuit for each air bag and for seat belt pre-tensioners.

The code B1100 does indicate a fault in the sensor assembly.

John 

It is the sensor assembly: however no one I spoke to / emailed around here   is interested in replacing the assembly because according to them it requires a lot of "stripping" 🙂. It had been independently diagnosed by an auto electrican to B1100 ( Airbag Sensor Assembly Malfunction ) -  they keep saying some other sensor / wiring fault must be causing the issue and they would have to exhaust all avenues (whatever that means ). 

 The diagnostics charges are  getting a ridiculuous. Seem to think the code would be cleared out on its own  if you put the car thru diagnostic code reader enough number of times  😞  without ever trying to fix the underlying fault. 

How difficult is it to get to the Airbag ECU ? 

Thanks

 

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11 hours ago, Tomgoode said:

It is the sensor assembly: however no one I spoke to / emailed around here   is interested in replacing the assembly because according to them it requires a lot of "stripping" 🙂. It had been independently diagnosed by an auto electrican to B1100 ( Airbag Sensor Assembly Malfunction ) -  they keep saying some other sensor / wiring fault must be causing the issue and they would have to exhaust all avenues (whatever that means ). 

 The diagnostics charges are  getting a ridiculuous. Seem to think the code would be cleared out on its own  if you put the car thru diagnostic code reader enough number of times  😞  without ever trying to fix the underlying fault. 

How difficult is it to get to the Airbag ECU ? 

Thanks

 

I do not know the exact location of the air bag ECU in your car, but it is usually in the dash. In my GS450H it is in the centre armrest console.

There is also a company that can check the ECU out, and reset it "if required" at realistic prices. Do a search on Ebay for air bag ECU reset or repair that should bring them up.

John.

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