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Iab....

Discussion in 'ECU's, Electronics, and Tuning' started by viciousracing, Mar 11, 2003.

  1. okay guys, i heard a lot of things.....gettin tweek here.....i heard that OBD1 B18C1 IAB uses ground for power. Then, i heard it uses the 12v......then again i heard that OBD1 uses ground and OBD2 uses 12v. what is really wrong here? i'm hella confused talkin about IAB for like the whole week now. :blink:
     
  2. pills_PMD

    pills_PMD Super Moderator

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    okay... once and for all:

    OBD1 b18c1:

    the iab will have the following wires coming off of it:
    -yellow/black
    -------> this wire has a 12v constant whenever the key is on from the main pgm-fi relay

    -pink/blue
    ---------> this is the wire that goes to the ECU and the ECU grounds it to turn it on... pin a17
     
  3. pissedoffsol

    pissedoffsol RETIRED

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  4. civicSiR1

    civicSiR1 Senior Member

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    where is the IAB located. I heard it a black box or sumthin under or near the IM. any suggestions?
     
  5. where is the 12v located on the ECU?????
     
  6. pills_PMD

    pills_PMD Super Moderator

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    the 12v doesn't go to the ecu. it comes from the main pgm-fi relay.

    you could really tap into any 12v + source that has power when the key is on.

    the ECU ground teh solenoid to complete the circuit and turn the IAB solenoid on
     
  7. what will be a good source to tap it into?
     
  8. pills_PMD

    pills_PMD Super Moderator

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    i dont have the diagram in front of me anymore... and i've never done this , i'm just going by diagrams so i really can't say

    get a voltmeter and do some detective work. find a Key on ignition off power source
     
  9. on the helms manual, it post out one wire to A17. then the other points out to a square with a B in the center.....i only have one page of the diagram......whats the square with the B in the center for......i think it'll solve what i'm lookin for...
     
  10. anyone has the Key for it?
     
  11. H22aCivic97

    H22aCivic97 Junior Member

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    The one wire goes to A17 (usually pink) and the other is a 12V power source(yell/blk). Just tap a yell/blk wire from one of your injectors. The stock wiring diagram says to tap the VSS(yell/blk) wire. The injector wires are just closer.

    VSS=velocity sensor switch
     
  12. so i just take the yell/blk wire from IAB and attach it to one of the injector wires?
     
  13. H22aCivic97

    H22aCivic97 Junior Member

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    Yes, make sure it's also yell/blk...
     
  14. aight, i'll try that.....see if it works.
     
  15. the yel/blk wire is A25, what is that?
     
  16. H22aCivic97

    H22aCivic97 Junior Member

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    The yell/blk wire is a 12V power source keyed to the ignition. I have mine spliced in with my VSS switch. If you trace them back to the ECU they plug into A25.
     
  17. oh shit, hell yeah, i got it running man. thanks bro!
     
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