troubleshooting ECU SRS airbag code 20FF00

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willydog - 08 Apr 2007 22:43 GMT

Hi folks. I have a blinking airbag light on my 93 altima. I've done
the "press the driver door switch 5 times within 7 seconds" to get
into diagnosis mode, and I don't any problem codes being displayed.
I'm getting the nice smooth 3 seconds on, 2 seconds off, which my
manual says this : "not malfunctioning or intermittent repair/
completion"... Maybe I'm not doing the procedure right and somehow
it's not getting back into user mode? (wishful thinking? lol)

Anyway, I did pull a code with my consult board I bought from ebay.

code 20FF00

clear codes - did not work.

Does anybody have any idea what is going on here?

Thanks in advance.
Vette

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Telstar Electronics - 09 Apr 2007 18:28 GMT

> Hi folks. I have a blinking airbag light on my 93 altima. I've done
> the "press the driver door switch 5 times within 7 seconds" to get
[quoted text clipped - 14 lines]
> Thanks in advance.
> Vette

Maybe you're not getting into the diagnostic mode?
How did you deduce you made it into that mode?

www.telstar-electronics.com

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willydog - 09 Apr 2007 18:47 GMT

> Maybe you're not getting into the diagnostic mode?
> How did you deduce you made it into that mode?

Hi. Thanks for your reply. Based on my reading of my $6 adobe PDF
"service manual" I bought on ebay, I followed the procedure to get
into diagnostic mode. However - your point is valid. I did not see any
change in behavior in what I perceived to be diagnostic mode versus
that of user mode. I get the steady 3 sec on/ 2 sec off, no matter how
many times I try the DSS trick to toggle between the two modes.

Would the airbag light flash this way if I were in user mode? Or
rather, does it stay solid when a fault is detected?

The 20FF00 fault code wouldn't clear with the eperformance guys
consult software, so either the software doesn't handle that too well,
or the code can't be cleared because a legitimate fault exists in the
system.

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Telstar Electronics - 09 Apr 2007 19:11 GMT

> > Maybe you're not getting into the diagnostic mode?
> > How did you deduce you made it into that mode?
[quoted text clipped - 13 lines]
> or the code can't be cleared because a legitimate fault exists in the
> system.

I haven't done your courtesy light switch trick in quite a while...
and I kind of forget how the diagnostic mode goes. But my opinion is
that there would have to be a distinct difference in the cadence of
the airbag light for one to know that he had reached the diag mode.
I'll have to check into this a bit more.

www.telstar-electronics.com

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willydog - 13 Apr 2007 01:06 GMT

Hi folks. Somebody out there must have a 93/94 shop manual. Can
anybody look up this code? Thanks.

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willydog - 18 Apr 2007 03:00 GMT

I spoke with the guy at ecutalk, and he gave me a few ideas. One is
that this 20FF00 could be the "all good" code for the SRS system, like
for example with consult code 55 means all good.

So I'm still seemingly stuck in diagnostic mode with the 3 sec. on, 2
sec. off. I have tried all sorts of permutations of the driver side
switch reset, and nothing is getting me back to user mode. I have
never received any kind of flash codes either. What I don't know if
this is a symptom of the diagnostic sensor unit being flaky, some
other flakiness, or if there is still some hope to the situation of
getting back to a working user mode. If the diagnostic sensor unit was
shot, in theory I should get some flash codes, but I'm not.

I'm thinking about buying a diagnostic sensor unit (aka airbag control
unit) and putting it in, as if any part is bad, my guess is this one.
I can get one of them for $85 brand new, OEM off the net, but I don't
want to waste the $85 if it doesn't need it.

I have the service manual with the procedure, so I should be all set
there. Just don't want to waste the money, if it doesn't need it. Any
thoughts? Thanks in advance.

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