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Old 01-01-2014, 07:25 PM   #1
yakovenkooleg
 
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B1900 srs code

have srs light on , DTC code 1900 (short in right seatbelt pretensioner) have done everything to it. changed seat belt, floor wire, srs modual, light is still on. any ideas why and what can cause that?
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Old 01-01-2014, 08:53 PM   #2
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Did you replace the seatbelt with a used one? If so, check the rectangular block on the end and if you can see orange through the tiny holes, then the replacement one popped in a crash.
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Old 01-01-2014, 09:03 PM   #3
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i replaced it with used one ( i've actually tried two different once) and they are good. you cant see the orange or red in the holes. i did take apart the one that went off in the accident, and you can clearly see the red stuff in the holes
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Old 01-01-2014, 09:26 PM   #4
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i replaced it with used one ( i've actually tried two different once) and they are good. you cant see the orange or red in the holes. i did take apart the one that went off in the accident, and you can clearly see the red stuff in the holes
OK. In that case, have you cleared the code with the procedure in the thread below, as that is a code that will not clear automatically.

http://www.yarisworld.com/forums/sho...d=1#post557473
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Old 01-02-2014, 01:07 AM   #5
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yes i have! i do the procedure, after which when i turn off the ignition for less than a second the srs light functions normal, but when the ignition is off for more than a second the light remains on and the same code is up, which is 73
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Old 01-02-2014, 06:14 AM   #6
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yes i have! i do the procedure, after which when i turn off the ignition for less than a second the srs light functions normal, but when the ignition is off for more than a second the light remains on and the same code is up, which is 73
OK. So either the wiring between the SRS ECU and the seat belt is damaged or that output channel on the SRS ECU is bad. You mentioned that you checked everything out. How did you test the wires?
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Old 01-02-2014, 10:32 AM   #7
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I unbuckled both ends ( from srs ecu and seat belt) and ran voltage through each wire individually
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Old 01-02-2014, 10:54 AM   #8
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I unbuckled both ends ( from srs ecu and seat belt) and ran voltage through each wire individually
The B1900 code indicates a short, so if you have a multimeter, the best way to check it would be to disconnect both ends and measure the resistance between the two pins (it should measure as a open connection) and then each pin separately to chassis ground (which should also both measure as open connections). If that all checks out then you have a bad SRS ECU.
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Old 01-02-2014, 11:16 AM   #9
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What should be a resistance on that? A zero?
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Old 01-02-2014, 11:18 AM   #10
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What should be a resistance on that? A zero?
Zero would be a short. You should see the same thing on the display as you would see with the probes not touching anything (some meters display O.L. or something like that)
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Old 01-02-2014, 11:20 AM   #11
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So I just put probes to the negative and positive side if the seatbelt connector?
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Old 01-02-2014, 11:26 AM   #12
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So I just put probes to the negative and positive side if the seatbelt connector?
Yes first do that, then do each individually with the other probe on a chassis ground (any unpainted bolt into metal)
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Old 01-02-2014, 11:31 AM   #13
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Does the ignition has to be on while I do that?
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Old 01-02-2014, 12:18 PM   #14
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Does the ignition has to be on while I do that?
No. It must be off before you unplug the two ends.
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Old 01-02-2014, 04:13 PM   #15
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Checked it all out, looks good. Getting O L on the ohm meter on both wires and on the grounds!
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Old 01-02-2014, 05:14 PM   #16
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Checked it all out, looks good. Getting O L on the ohm meter on both wires and on the grounds!
OK. So it sounds like you need a new SRS ECU. What's the part number on the one in your car?
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Old 01-02-2014, 05:22 PM   #17
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80z0661331 i dont know if thats the right one. but i have two different SRS ECU, one that i had the crash data cleared off of, and the other one from my donor (parts car) that i have.
both of then show the same code. maybe i need one from a dealer, a brand new one?
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Old 01-02-2014, 05:32 PM   #18
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The part number should be 89170-52630 or 89170-52690 for your 08 3 door. If you PM me your VIN I can tell you specifically which one it should have.

I have a couple of good 89170-52690 on hand if that's what you need.
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