Airbag light on in Avensis

johndaman66

hi folks, bangernomics motoring all going well in the 01' Avensis apart from nct date looming and airbag light after coming on in the dash about a month back. At first it was staying on constant and flashing, now it seems to be staying on constant.


Could anyone tell me howI might go about rectifying this if it is a DIY job. One guy told me it was a main dealer only job to rectify but I'm not going to take his word alone on that. If I wanted to do a few checks myself where might I be best placed to start?


Thanks

Greyfoot

Disconnect the battery then start with the airbag connection under the drivers seat. Spray some contact spray then refit. A fault code read is a must to properly diagnose it though. And of course you could always take out the clocks and remove the airbag bulb before NCT?

Atlantic Dawn

Greyfoot wrote: »

And of course you could always take out the clocks and remove the airbag bulb before NCT?

And it will then certainly fail as it will be not on when the ignition is turned on.

Greyfoot

Atlantic Dawn wrote: »

And it will then certainly fail as it will be not on when the ignition is turned on.

Reading through previous NCT related threads chances are that they'd miss it...and I was joking I do think about them children worry not, surely an airbag fault would jeopardize safety anyway. :P

johndaman66

Greyfoot wrote: »

Disconnect the battery then start with the airbag connection under the drivers seat. Spray some contact spray then refit. A fault code read is a must to properly diagnose it though. And of course you could always take out the clocks and remove the airbag bulb before NCT?

Greyfoot thanks but not a wire to be found under the either passenger seat or drivers seat in the Avensis. Dont know maybe they are burried under the carpet but such is not apparent to me.


brother got me a universal fault code reader for Christmas. Haven't used it yet but beleive it wont do airbags

PADRAIC.M

Yeah first of all no connections under Avensis seats, first think to do is flash a fault code out, tester not needed, just bridge pin 4-13 of the diagnostic plug to begin the flash procedure then tell me how many times the airbag light flashes, eg a code-13 flashes like- 1 flash, pause then 3 more flashes then long pause.

johndaman66

PADRAIC.M wrote: »

Yeah first of all no connections under Avensis seats, first think to do is flash a fault code out, tester not needed, just bridge pin 4-13 of the diagnostic plug to begin the flash procedure then tell me how many times the airbag light flashes, eg a code-13 flashes like- 1 flash, pause then 3 more flashes then long pause.

Thanks PADRAIC.M. I heard of connecting pins on Vectra before with a paper clip for diagnosing. never did it mind. I will try what you say tomorrow and if you could let me know what the problem is after I report back my results to you I would be most appreciative. To check in with you PADRAIC.M. will it always be a 2 digit number or could there be more than 2 digits?

Thanks again

PADRAIC.M

johndaman66 wrote: »

Thanks PADRAIC.M. I heard of connecting pins on Vectra before with a paper clip for diagnosing. never did it mind. I will try what you say tomorrow and if you could let me know what the problem is after I report back my results to you I would be most appreciative. To check in with you PADRAIC.M. will it always be a 2 digit number or could there be more than 2 digits?

Thanks again

No always 2 digit but there could be more than 1 code stored

johndaman66

PADRAIC.M wrote: »

No always 2 digit but there could be more than 1 code stored

PADRAIC.M Just bridged them pins there. Got a '31' followed a '72'. Hopefully you might be able to provide me with a possible issue(s) from these, thanks in advance

Avns1s

Details of the codes are below. Sorry for the formatting as a result of the cut and paste but you'll get the gist. There is no 72 listed, sure it's not 71?

31 is Vacuum sensor signal and 71 would be EGR Vacuum Feedback Management - possibly related.



CODE SYSTEM Related areas
1 NORMAL NIL
12 RPM SIGNAL 1 * Wirings and connectors (Crankshaft
position sensor, Starter signal circuits) * Distributor * ECU
(Engine Control Unit)
13 RPM SIGNAL 2 * Wirings and connectors (Crankshaft
poistion sensor circuits) * Distributor * ECU (Engine Control
Unit)
14 IGNITION SIGNAL * Wirings and connectors iIgnitor,
Ignition coil circuits) * Ignitor, Ignition coil * ECU (Engine
Control Unit)
16 ECT CPU * ECU (Engine Control Unit)
17 COMBUSTION PRESSURE MANAGEMENT
CPU * ECU (Engine Control Unit)
21 O2 SENSOR * Wirings and connectors * O2
sensor * Fuel systems (Injector, fuel pump) * Ignition systems
(Spark plugs, ignitor) * Vacuum sensor * ECU (Engine Control Unit)
22 COOLANT TEMPERATURE SIGNAL * Wirings and connectors (Coolant
temperature circuits) * Coolant temperature sensor * ECU (Engine
Control Unit)
24 INTAKE AIR TEMPERATURE SENSOR
SIGNAL * Wirings and connectors (Intake
air temperature circuits) * Intake air temperature sensor * ECU
(Engine Control Unit)
25 LEAN ERROR * Wirings and connectors (O2
sensor circuits) * Fuel systems (Injector, fuel pressure) * Vacuum
sensor * ECU (Engine Control Unit)
31 VACUUM SENSOR SIGNAL * Wirings and connectors (Vacuum
sensor circuits) * Vacuum sensor * ECU (Engine Control Unit)
33 ISCV (IDLE SPEED CONTROL VALVE) * Wirings and connectors (ISCV
circuits) * ISCV * ECU (Engine Control Unit)
36 COMBUSTION SENSOR SIGNAL * Wirings and connectors (Combustion
sensor circuits) * Combustion sensor * ECU (Engine Control Unit)
41 MAIN THROTTLE POSITION SENSOR
SIGNAL * Wirings and connectors (Main
throttle position sensor circuits) * Main throttle position sensor
* ECU (Engine Control Unit)
42 SPEED SENSOR SIGNAL * Wirings and connectors (Speed
sensor circuits) * Speed sensor * ECU (Engine Control Unit)
43 STARTER SIGNAL * Wirings and connectors (Starter
circuits) * ECU (Engine Control Unit)
47 SECONDARY THROTTLE POSITION
SENSOR SIGNAL * Wirings and connectors (Secondary
throttle position sensor circuits) * Secondary throttle position
sensor * ECU (Engine Control Unit)
51 SWITCH SIGNAL * Wirings and connectors (Air
conditioning switch circuits, Neutral starting switch circuits)
* Air conditioning switch * Neutral starting switch * ECU (Engine
Control Unit)
52 KNOCK SENSOR SIGNAL * Wirings and connectors (Knock
sensor circuits) * Knock sensor * ECU (Engine Control Unit)
71 EGR VACUUM FEEDBACK MANAGEMENT * Wirings and connectors (EVRV
circuits) * Crack, disconnection, blockage of sensing pipe * EVRV
* Pressure sensor * ECU (Engine Control Unit)
81 ECT RELAYING (ECT1) * Wirings and connectors * ECU
(Engine Control Unit)
83 ECT RELAYING (ESA1) * Wirings and connectors * ECU
(Engine Control Unit)
84 ECT RELAYING (ESA2) * Wirings and connectors * ECU
(Engine Control Unit)
85 ECT RELAYING (ESA3) * Wirings and connectors * ECU
(Engine Control Unit)

johndaman66

Avns1s thanks for your response but it was the airbag light as opposed to the engine light I got them sequence of flashes through.

Presumably your codes relate to engine management light??

Toyotafanboi

johndaman66 wrote: »

Avns1s thanks for your response but it was the airbag light as opposed to the engine light I got them sequence of flashes through.

Presumably your codes relate to engine management light??

i think low voltage is the only thing that will allow the airbag light illuminate and subsequently go back off of its own accord.

how old is you battery? check the condition of the alternator and associated alternator and battery connections. have you any heavy electrical loads in the car?

do you have a multimeter you could do a few basic checks with?

PADRAIC.M

Well code 31 is an internal fault in the airbag ecu which might clear easily but code 72 is a fault for a short in Left hand front pretensioner. Basically you will need to probably change lhf seat belt reel (not RECIEVER) there is a test you can do with a resistor where you plug it in instead of the pretensioner with a resistor of same resistance but I wouldn't recommend this as a day job really...

johndaman66

PADRAIC.M wrote: »

Well code 31 is an internal fault in the airbag ecu which might clear easily but code 72 is a fault for a short in Left hand front pretensioner. Basically you will need to probably change lhf seat belt reel (not RECIEVER) there is a test you can do with a resistor where you plug it in instead of the pretensioner with a resistor of same resistance but I wouldn't recommend this as a day job really...

Thanks PADRAIC. I can should be able to get that part from a local scrappy and change it handy enough over the next few weeks. Wont be done immediately but will let you know how I get on. Appreciated;)