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Subaru Car Air Bag

http://berklix.com/~jhs/txt/airbag/

by Julian H. Stacey

DEUTSCH via translate.google.com (does not translate while password locked)
This page format is rough - Notes to be pruned later.

Which PDF Manual ?

Intro

My car (Subaru Legacy 1998) air bag warning light was iffy, then came on solid. Subaru Dealers had failed to fix several times { Retired first dealer seemed to improved it, but he wasn't happy it would last, & he didn't say how he'd fixed it (trade secret or more likely foreign language limitations) (I noted at 2019-10 that the cable reel (informally: Clock Spring) seal is broken). 2nd dealer had no time on 1 or 2 services, then mechanic admitted he didn't like doing electrics, he preferred mechanics}, so I'm doing it.

Battery

I disconnected battery, left it to stand, touched brake pedals in case any electrolytics anywhere in car might be storing charge.

Subaru dealers tell me Subarus don't have a supplementary 2nd battery, unlike other manufacturers (eg Nigel ex BMW warned me of that).

Static

(My half nylon/ similar shirts & non leather footwear can give static shocks eg with a friend in garage today. ... Wonder if bags blow on real current or just voltage ? - so I grounded myself to wheel chassis before removing bag).

Name SRS & Takata

"SRS Airbag" just means Supplementary Restraint System", ie they expect safety belt to have held your body back in a crash before the bag explodes in your face . SRS is not a trade name (as I'd falsely assumed it was), so seeing "SRS" does not mean you don't have a Takata air bag, which are bad news:

How To Videos

There are Lots of How To videos on YouTube, eg All for different newer models I don't have,
with sundry different tips, inc. eg:
  • Torque the wheel to 38 or 49 foot pounds (Different video)
    [ My torque wrench took the steering wheel off, when set to 38 ft lb (=5.25 Kg m) & I think it felt as if wheel was probably on with less than 38].
    Manual I bought { specified: 34 +- 5 N-m, (3.5 +- 0.5 kg-m, 25.3 +-3.6 ft-lb) (& also showed a normal washer & lock washer I did not find on axle) }.
  • Wheel nut: 17 mm. Don't completely take off wheel nut, till you've vigorously wiggled & wobbled it loose (to avoid it flying back in your face. while wrestling
    [ Mine had 2 screwed holes for a wheel extractor tool, which I didn't need. I'd add: I added a CrookLock (an anti theft bar that locks to wheel) to aid leverage, then I didn't use that, & while using toque wrench nut suddenly came use, & hand slammed into the bar; obvious lesson: remove what you don't need.
  • Don't look at air bag with a meter, to avoid triggering an explosion.
    [ If I must, I would stand sideways, & use a 20,000 ohm/volt meter with 3 low current button cells (voltage to check), not a less sensitive DVM that probably pushes lots more current using its 9V block battery or several chunky AA batteries. ]
  • "Every forum I have checked refers to either these mythical resistor plugs, or 3.3 ohm 0.25w resistors"
  • "Some 3.3ohm resistors ( get more than you need )"
  • My Bag is a MOMO
  • forum . miata . net / vb / archive / index . php / t - 83980 . html
    • I had installed the Momo and just used a 2W 3.0 Ohm resistor
    • As is posted elsewhere, use a 3-ohm resistor in place of the airbag. The local RS didn't have one, so I soldered three 10-ohm in parallel (3.3 ohms). No blinkage.
    • As is posted elsewhere, use a 3-ohm resistor in place of the airbag. The local RS didn't have one, so I soldered three 10-ohm in parallel (3.3 ohms). No blinkage.
    • 3ohm resistor www . miata . net / garage / momo / momowheel . htm
  • www . amazon . com / MOMO - Steering - Wheel - Airbag - Resistor / dp / B009PA5HIG # customerReviews has "Stephen Rawlins
    1.0 out of 5 stars Useless - doesn't fit or work
    March 8, 2013
    Verified Purchase
    We upgrade a lot of late model sports cars with racing steering wheels, primarily Momos in both fixed and quick release. We have been looking for a elegant way to turn off the Airbag light on the dashboard.
    This device is not it. Don't waste your time or money. We eventually used a 2.2K Ohm resistor (0.30 cents) and it worked like a champ.
    10 people found this helpful

    The 2.2k Ohm resistor worked for us on 1997-2013 Corvettes
    Stephen, quick ? I tried the 2.2k Ohms with the resistor supplied by Momo and light is still flashing on my 250z any suggestions?
     "
    What size resister are you using Answer: 4 Ohms TL · September 1, 2018
  • One can make a dummy for an air bag (for insertion into a plug while retrofitting a non air bag wheel to a car with air bag circuitry) with a 3.3 ohm resistor ! Seen on:
    [ I wouldn't want to loose an air bag from a car, but I wanted to test if warning light does not illuminate with a resistor dummy, so I made a dummy with 3 x 10 ohm 1/4 watt resistors in parallel. Note if that dummy were exposed to 12V, that would be ( 12/3.3 = 4 amps ! Too much power just to sense continuity to one of the air bags.
  • Air bag connectors are tricky, with release sliders on yellow clips.
    [ My connector between cable reel & car was very problematic. On the back of my cable reel, I had to carefully use side cutters on socket of black disc container, to expose the white nylon plug to pull it out. (Some kind of ratchet I couldn't release, despite pushing a blunt clipped cable tie as spacer down the hole of the socket on the cable reel chassis). ]
  • Videos all show air bags with 2 x 2 pole sockets: 2 yellow wires for air bag, + 2 black wires for horn.
My Case:
  • I've taken off: air bag, steering wheel, & cable reel (the circular disc containing ribbon cable that youtube videos call a Clock Spring.
  • My car (Subaru Trend, 1998) is older than cars in the videos,
  • mine has just 2 (yellow) wires on the back of the air bag (though I have a horn too).
  • 3 other wires out of the cable reel all go to a 2nd white nylon plug with just 1 pin : which connects to steering wheel chassis, (bottom most nearest edge of wheel)
  • The chassis of air bag is on 4 nylon posts/ locaters, presumably insulated from chassis of wheel except when the horn = airbag chassis is pushed, when presumably it touches wheel chassis.

  • When the system is powered up with dummy resistor instead of an air bag, the air bag is still on Unfortunately.
  • There is about 9V between both terminals of the dummy resistor & wheel chassis.
  • I can't see one of the resistor terminals being more positive than the other.
  • I took lots of photos, some relevant subset could go online later.
  • I suspect my car has no OBD, though there is one (maybe 6 pin) plug hangs loose near steering.
  • New additional notes in other files off line
Refs:

Workshop Manuals

Manuals

EMA : Emanualonline - LIV : Liverpool Most PDF - Liverpool ./Liberty.pdf

Index Of Links To Data Not On Internet Only Local
EMA LIV 2-01_diagnostics_s_foreword.pdf
EMA LIV 2-01_engine_s_emission_control_system_and_vacuum_fitting.pdf
EMA LIV 2-02_engine_s_on-car_services.pdf
P 3 Subaru Connect Selector to Data Link Connector ST 24082AA090 Cartridge OBD-II
EMA LIV 2-03a_engine_s_engine__sohc_.pdf
EMA LIV 2-03b_engine_s_engine__dohc_.pdf
EMA LIV 2-04_engine_s_engine_lubrication_system.pdf
EMA LIV 2-05_engine_s_engine_cooling_system.pdf
EMA LIV 2-05_diagnostics_s_engine_cooling_system.pdf
EMA LIV 2-07-0_engine_s_foreword.pdf
EMA LIV 2-07_engine_s_fuel_injection_system.pdf
EMA LIV 2-07_diagnostics_on-board_diagnostics_ii_system_s_01.pdf
EMA LIV 2-07_diagnostics_on-board_diagnostics_ii_system_s_02.pdf
EMA LIV 2-07_diagnostics_on-board_diagnostics_ii_system_s_03.pdf
EMA LIV 2-07_diagnostics_on-board_diagnostics_ii_system_s_04.pdf
EMA LIV 2-07_diagnostics_on-board_diagnostics_ii_system_s_05.pdf
EMA LIV 2-07_diagnostics_on-board_diagnostics_ii_system_s_06.pdf
EMA LIV 2-07_diagnostics_on-board_diagnostics_ii_system_s_07.pdf
EMA LIV 2-07_diagnostics_on-board_diagnostics_ii_system_s_08.pdf
EMA LIV 2-07_diagnostics_on-board_diagnostics_ii_system_s_09.pdf
EMA LIV 2-07_diagnostics_on-board_diagnostics_ii_system_s_10.pdf
xpdf=P171 content=P286 Clear Memory 2-7 [T3D0] Inspection Modes 2-7 [23E0]
EMA LIV 2-07_diagnostics_on-board_diagnostics_ii_system_s_11.pdf
EMA LIV 2-08_engine_s_fuel_system.pdf
EMA LIV 2-09_engine_s_exhaust_system.pdf
EMA LIV 2-10_engine_s_clutch.pdf
EMA LIV 2-11_engine_s_engine_and_transmission_mounting_system.pdf
EMA LIV 3-01_transmission_and_differential_s_manual_transmission_and_differential.pdf
EMA LIV 3-02_diagnostics_s_automatic_transmission_and_differential.pdf
EMA LIV 3-02_transmission_and_differential_s_automatic_transmission_and_differential.pdf
EMA LIV 3-03_transmission_and_differential_s_transmission_control_system.pdf
EMA LIV 3-04_transmission_and_differential_s_awd_system.pdf
EMA LIV 4-01_mechanical_components_s_suspension.pdf
EMA LIV 4-02_mechanical_components_s_wheels_and_axles.pdf
EMA LIV 4-03_mechanical_components_s_steering_system.pdf
EMA LIV 4-04_mechanical_components_s_brakes.pdf
EMA LIV 4-04_diagnostics_s_brakes.pdf
EMA LIV 4-05_mechanical_components_s_pedal_system_and_control_cables.pdf
EMA LIV 4-06_mechanical_components_s_heater_and_ventilator.pdf
EMA LIV 4-07_mechanical_components_s_air_conditioning_system.pdf
EMA LIV 5-01_body_s_body_and_exterior.pdf
EMA LIV 5-02_body_s_doors_and_windows.pdf
xpdf_page_11, 5-2 9 Weatherstrip
Door frames for cables to belts.
EMA LIV 5-03_body_s_seats,_seat_belts,_and_interior.pdf
xpdf_page_11
5-3 5.A.1 Side Sill
EMA LIV 5-04_body_s_instrument_panel.pdf
EMA LIV 5-05_body_s_supplemental_restraint_system.pdf
xpdf_page_12
5-5 4 A Main Harness, Removal
EMA LIV 5-05_diagnostics_s_supplemental_restraint_system.pdf
xpdf_page_2
5-5 2 Schematic; xpdf_page_3 5-5 3 Diagnostic - Test Harness
EMA LIV 6-01_electrical_s_engine_electrical_system.pdf
No ref to airbag
EMA LIV 6-02_electrical_s_body_electrical_system.pdf
No ref to airbag
6-2 14 A xpdf_page_30 Combination Meter (aka dashboard console) Removal
EMA LIV 6-02a_diagnostics_s_body_electrical_system__cruise_control_.pdf
EMA LIV 6-02b_diagnostics_s_body_electrical_system__electrical_parts_.pdf
EMA LIV 6-03-wiring_diagram_s_foreword.pdf
EMA LIV 6-03_wiring_diagram_s_wiring_diagram.pdf 
    XPDF    MEDIA
    30   29 air bag, No connection to seat belts.
         60 Top Right: Check Connector
         61 looks like 16 pin OBD as in
            wikipedia
        113 seat belt
        133 Locations
                 Diagnosis Connector     4-4 T300
                 Mode Actuator           6-3 D7B2
                 OBD-II Connector        2-7 T2A3
                 SSM Connector           2-7 T2A3
                 Test Mode Connector     2-7 T2A3
        135   (25) Check connector  <Ref to 6-3 [D7B4]>
                 under wheel, behind right seam.
        140 Ground points
        142 Front Wiring Harness
    147 146 LHD engine room
        150   No        - Pole - Color - Area    - Connect to No - Con to Name
        150   B40       - 16   - Gray  - C2      -               - Data Link Connector
              B75 & B76 - 2    - Green - C2 & C3 - B76 & B75     - Test Mode Connector
              B82       - 6    - Black - C2      -               - Diagnosis Connector
EMA LIV Australian Liberty pdf
xpdf p14 & 16 & 53 Error codes Clear Mem : 5-5 T4C0
    P 4057 Wiring system
    Sect 6 +52 =P4109 Shows air bag system inc. belt pretensioners
    Sect 41 +300 Seat Belts
Notes:

YouTube

  • youtube.com/watch?v=17Yvm4WBMBk 
        By Busaru

    Adding an OBD to a 1998 Subaru

            circuit diag at end.
        +Mart Brandjes In North America OBD2 was standard in 1995 for Subarus.
        Bóbr Bobrowski
        1 year ago
        in europe some cars from 98 have obd style socket with
        subaru protocol all after 00 have same thing and after 02
        its full OBD suport present
        Marc Instone
        3 years ago
        Is pin 7 what they call the K-Line ?
        +Marc I believe that's right. To be honest, I'm not really
        sure what it means, just haven't researched it.
        BUSARU
        1 year ago
        +Bóbr Bobrowski Sorry mate, I should have mentioned that in the video - 98 Legacy.

    Connector Name: OBD2 Connector

    • wikipedia
    • Number: B40
    • Colour: Gray,
    • Location:(if present)
    • Pinout:2 rows of 8 pins = 16 pin, sloped slides. Seen from front: 
      +-----------------------------+
 \  01 02 03 04 05 06 07 08  /
  \ 09 10 11 12 13 14 15 16 /
   +-----------------------+
    • Function:
        Frame Grab: subaru_obd2_addition.png
        Pins    Colour          Written Description Audio
         4  purple+silver band  Ground
         5  black +silver band  Ground
         7  orange + white band ECM Pin 93
         8  red + silver band   ATCU    Auto transmission - cut
                        = not needed for a VW swap
        12  light green + red strip ECM Pin 91
        13  green+white stripe  ECM Pin 92
        16  red + 2 silver bands    12V, straight to battery,
                        or rewire via ignition
                        to avoid battery drain.
  • youtube.com/watch?v=zgrifWm3G6k

    How to read Pre-99' Subaru Engine Error Codes

            join the 2 black plugs, turn on ignition (dont start engine)
        'Check Engine" flashes (if a previous vendor has not crippled it).
        Count number of flashes
        If the CEL flashes reguarly ie more than 6 long flashes,
        then there are no stored codes.
        Reset ECU by disconnecting battery overnight
  • youtube.com/watch?v=3y55wdRsa3Q 
            Light brown singular plug:
                is oldest Subaru plug for diagnostic scanner.
                Called: Select Monitor One.
                4 pins in a row, 3 occupied + 1 small hole in middle
        2 green connectors to join togther:
                Called D (Dealer) check.
                2 contacts at right angles
                turns all solenoids on.
        Listen for solenoid clicks & fans whirring.
        2 black connectors
                2 connectors I think
                for error codes "U Check"
        Singular black connector:
                 7 pin, used wth ground wires, to set a condition to get
        more error codes
  • youtube.com/watch?v=g1K7PqhmDW8 
            the singular black connector:
        hold it toward you like a 'u'
        top left of u is pin 1, top right is 2,
        dont use bottom 4 contacts,
        there are 2 loose pins for shorting,
    depending on model both black, or black & white.
        pin 1 if earthed (with ignition on): initiates error display
        pin 2 if earthed as well as 1 (with ignition on): clears error memory.
        long blink indicates decades of error codes 10,20 etc,
        short blink is digits 0,1,2
        long slow blinks continuosly means no more errors
        error codes: vehix411.com
        airbag control system  codes or also known as airbag trouble codes
        for subaru wrx sti 02, 03, 04, 05
        will probably work for most subaru year 2000 and 2005.
        11 airbag harness driver circuit is open, short, or short to ground
        12 airbag harness passenger circuit open, short,    short to ground
        15 airbag module harness driver is short to power supply
        16 airbag harness circuit passenger short to power supply
        21 airbag control module is faulty
        22 front airbag module and seat belt pretensioner l / r inflated
        23 connectors not connected properly to airbag control module
        24 airbag control module is faulty
        25 airbag control module is faulty
        31 front sub sensor harness r side
        32 front sub sensor harness l side
        41 side airbag harness r side is faulty
        42 side airbag harness l side is faulty
        45 side airbag harness r  side is shorted to power supply
        46 side airbag harness l  side is shorted to power supply
        51 side airbag sensor r side is faulty
        52 side airbag sensor l side is faulty
        53 side airbag sensor r side is faulty
        54 side airbag sensor l side is faulty
        55 side airbag module is inflated
        61 seat belt pretensioner r side circuit open, short, short to ground
        62 seat belt pretensioner l side circuit open, short, short to ground
        65 seat belt pretensioner r side circuit open, short, short to ground
        66 seat belt pretensioner l side circuit open, short, short to ground
        if a seat belt is removed, fake it out with a
        3 ohm .25 watt (eg 3 x 10 ohm in parallel).
First note if it stays on > 7 sec, or comes back on after 30 sec.

Connector Name: Diagnosis (Name from 5-5 T4A1), Name 'U' from Videos

  • Number: B82 3F
  • Colour: Black ?
  • Location
  • Pinout 
    +---+    +---+
| 1 |    | 2 |
|   +----+   |
| 3  4  5  6 |
+------------+
  • Function:
    • First put a wire into pin 1, to get output blink codes: (As under the dashboard is dark & cramped, realise you need to rotate connector, as it's flat, not a square or round pin connector):
      • Blink on for 1.2 secs is decades, eg: 10,20,30
      • Blink on for 0.3 secs is units, eg: 1,2,3
      • Steady on & off with each 0.6 secs = all OK, no error.
    • Note the error (or all errors, may be more than one). To clear the error log: Put 2nd wire in pin 2 while blinking for minimum 3 secs.

Connector Name: U Check

  • Number: ?
  • Colour: Black
  • Location:
  • Pinout:
  • Function: Connect both for flash codes for engine error codes

Connector Name: Check Connector

  • Number: B79
  • Colour: ?
  • Location: behind right seam of knee panel.
  • Pinout: 6 in a row 
    +-------------+
| X X X X X X |
+-------------+
  • Function:

Connector Name: D Check Dealer

  • Number: B75 + B76
  • Colour: Green
  • Location:
  • Pinout:2 x 2 Pin
  • Function: Turns on all solenoids

Connector Name: Unknown

  • Number: ?
  • Colour: Light Brown
  • Location:
  • Pinout: 5 pins in a row 
    +-----------+
| X X X X X |
+-----------+
  • Function:
  • Note: Up to 1995+.

My error codes

11, 22, 12

Problems

  • The manual lists not one but lots of [alternate?] faults for each err code
  • The manual makes constant reference to using debug cables I dont have though It does list wiring of debug cables, so I might be able to identify plugs, buy at conrad & wire my own debug cables
  • The manual is written for dummies, for each err code it just lists: if some test with debug cable do this else that.
  • I cant clear any of the I presume historic faults, till I fix the extant fault, wherever, so it's hard to narrow it down.

Odds

: https://karmanauto.com/ Subaru parts

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