1. Welcome to Tacoma World!

    You are currently viewing as a guest! To get full-access, you need to register for a FREE account.

    As a registered member, you’ll be able to:
    • Participate in all Tacoma discussion topics
    • Communicate privately with other Tacoma owners from around the world
    • Post your own photos in our Members Gallery
    • Access all special features of the site

No head/tail lights or turn signals, squirrel chewed ground at J4

Discussion in '2nd Gen. Tacomas (2005-2015)' started by farmerjj, Aug 22, 2024.

  1. Sep 28, 2024 at 3:10 PM
    #81
    Dm93

    Dm93 Test Don't Guess

    Joined:
    Mar 3, 2015
    Member:
    #150066
    Messages:
    12,324
    Gender:
    Male
    Texas
    Vehicle:
    2014 DC OR 6spd 4x4
    Predator tube steps, Ranch Hand grill guard, Magnaflow CatBack exhaust, Toyota tool box & bed mat, 2LO Module by @Up2NoGood, Rearview Compass/Temp Mirror, Tune by @JustDSM.
    A bypass test is just that your bypassing the switch, if you take an incadecent test light connected to ground and touch it to say the Pink wire at Pin 17 of the Body ECU (connector plugged in of course) your essentially grounding that terminal just like the switch is supposed to and your headlights should come on. It's an easy check to see if a module responds to an input.

    [​IMG]


    Correct, the switch is divided into 3 sections, the Light Control Switch, Dimmer Switch, and Turn Switch.
    The lines with the circles in the box represent which terminals of the switch are connected when the switch is in each position.
    upload_2024-9-28_16-59-17.png


    Yes the Pink wire goes to Pin 9 of IJ1 and the Red/White wire goes to Pin 10 of IJ1 as noted on the diagram.
    The Red/Green wire goes directly to Connector 1I Pin 9 on the Driver's Side Junction Box (High Beam switch input)

    We need to do the bypass check to see if the Body ECU is working properly but it's kind of looking like an issue with the switch or the wiring between the switch and Body ECU. At this point I'm really not sure on anything, all these voltage measurements get me confused. It's why I prefer an incandescent test light it's a simple yes/no test, if you wana check a power you connect the other end to ground and if you wana check a ground you connect the other end to power. The light either lights or it doesn't.

    Sam thing if you wana check a switch input, test light is your friend.
     
  2. Sep 28, 2024 at 3:12 PM
    #82
    TnShooter

    TnShooter The TacomaWorld Stray

    Joined:
    Sep 2, 2010
    Member:
    #42625
    Messages:
    20,598
    Gender:
    Male
    First Name:
    Deogee
    Vehicle:
    07' TRD Off-Road, Auto
    STOCK
    Thanks for typing all that out. I’m stuck using my phone. Internet is out here. I’m having to use my phone for EVERYTHING.

    Guess it was all the wind from the hurricane?

    I just want the internet back. I miss my keyboard and big screen.
     
    Dm93[QUOTED] likes this.
  3. Sep 28, 2024 at 3:33 PM
    #83
    Dm93

    Dm93 Test Don't Guess

    Joined:
    Mar 3, 2015
    Member:
    #150066
    Messages:
    12,324
    Gender:
    Male
    Texas
    Vehicle:
    2014 DC OR 6spd 4x4
    Predator tube steps, Ranch Hand grill guard, Magnaflow CatBack exhaust, Toyota tool box & bed mat, 2LO Module by @Up2NoGood, Rearview Compass/Temp Mirror, Tune by @JustDSM.
    Hotspot your phone.
     
  4. Sep 28, 2024 at 3:34 PM
    #84
    TnShooter

    TnShooter The TacomaWorld Stray

    Joined:
    Sep 2, 2010
    Member:
    #42625
    Messages:
    20,598
    Gender:
    Male
    First Name:
    Deogee
    Vehicle:
    07' TRD Off-Road, Auto
    STOCK
    Apple to PC......
    I tried that, I'm too stupid to figure it out I guess?
     
  5. Sep 28, 2024 at 4:17 PM
    #85
    farmerjj

    farmerjj [OP] Well-Known Member

    Joined:
    Aug 22, 2024
    Member:
    #455676
    Messages:
    86
    Gender:
    Male
    Vehicle:
    2007 Tacoma 4.0L 4WD
    I've been using a digital test light, I was assuming it works the same as non-digital, but apparently not.
    Regular test light, clamp grounded, probe to pink wire while plugged in....headlights work!
    But with digital test light instead, no headlights, and voltages are seemingly all wrong.
    What next?
    [​IMG]
     
  6. Sep 28, 2024 at 4:33 PM
    #86
    Dm93

    Dm93 Test Don't Guess

    Joined:
    Mar 3, 2015
    Member:
    #150066
    Messages:
    12,324
    Gender:
    Male
    Texas
    Vehicle:
    2014 DC OR 6spd 4x4
    Predator tube steps, Ranch Hand grill guard, Magnaflow CatBack exhaust, Toyota tool box & bed mat, 2LO Module by @Up2NoGood, Rearview Compass/Temp Mirror, Tune by @JustDSM.
    I don't have time to explain it in detail at the moment but suffice to say the LED/Meter test light isn't loading the circuit.

    Lets do the same bypass test on the Pink wire at Pin 9 of IJ1.
     
  7. Sep 28, 2024 at 5:15 PM
    #87
    farmerjj

    farmerjj [OP] Well-Known Member

    Joined:
    Aug 22, 2024
    Member:
    #455676
    Messages:
    86
    Gender:
    Male
    Vehicle:
    2007 Tacoma 4.0L 4WD
    I cannot seem to find that clip with 2 rows of 5 pins and a pink wire.
    Also, the test light only works for low beams at the ECU, get only parking lights on high and flash.
     
  8. Sep 28, 2024 at 5:26 PM
    #88
    Dm93

    Dm93 Test Don't Guess

    Joined:
    Mar 3, 2015
    Member:
    #150066
    Messages:
    12,324
    Gender:
    Male
    Texas
    Vehicle:
    2014 DC OR 6spd 4x4
    Predator tube steps, Ranch Hand grill guard, Magnaflow CatBack exhaust, Toyota tool box & bed mat, 2LO Module by @Up2NoGood, Rearview Compass/Temp Mirror, Tune by @JustDSM.
    I just looked at mine, IJ1 is taped to the back of the harness right in the area where the glovebox damper is.

    17275695083965938657008771181372.jpg
     
  9. Sep 28, 2024 at 6:42 PM
    #89
    farmerjj

    farmerjj [OP] Well-Known Member

    Joined:
    Aug 22, 2024
    Member:
    #455676
    Messages:
    86
    Gender:
    Male
    Vehicle:
    2007 Tacoma 4.0L 4WD
    Thanks, same as the ECU side, low beams yes, no high only parking with stalk forward.
     
  10. Sep 28, 2024 at 7:37 PM
    #90
    Dm93

    Dm93 Test Don't Guess

    Joined:
    Mar 3, 2015
    Member:
    #150066
    Messages:
    12,324
    Gender:
    Male
    Texas
    Vehicle:
    2014 DC OR 6spd 4x4
    Predator tube steps, Ranch Hand grill guard, Magnaflow CatBack exhaust, Toyota tool box & bed mat, 2LO Module by @Up2NoGood, Rearview Compass/Temp Mirror, Tune by @JustDSM.
    I believe you would have to ground both the Pink (Headlight) and Red/Green (High Beam) or Red/White & Red/Green at the same time for the Body ECU to activate the High Beams.
     
  11. Sep 28, 2024 at 7:43 PM
    #91
    TnShooter

    TnShooter The TacomaWorld Stray

    Joined:
    Sep 2, 2010
    Member:
    #42625
    Messages:
    20,598
    Gender:
    Male
    First Name:
    Deogee
    Vehicle:
    07' TRD Off-Road, Auto
    STOCK
    That’s how I understand it too
    Pink, is for power head relay, this only sends power to the dimmer relay. The other Red/Green is for the switching the dimmer relay from high to low.
    Default (non energized) is low beams.
    Which is why you need to ground the red/green to switch to high beams.
     
  12. Sep 28, 2024 at 7:57 PM
    #92
    farmerjj

    farmerjj [OP] Well-Known Member

    Joined:
    Aug 22, 2024
    Member:
    #455676
    Messages:
    86
    Gender:
    Male
    Vehicle:
    2007 Tacoma 4.0L 4WD
    Now I'm suspicious of the red/green wire?
    Why would the ground pin of the DIM relay be getting 9+V when high beams are on?
    I seem to remember maybe the high beams come on if you squeeze the DIM relay?
    New or old DIM relays in the slot aren't any different.
    I should probably test those relay slots for ground and power again.

    Just a reminder, the DIM relay buzzes loudly when headlight switch on and stalk is on high or flash, but not low.
     
  13. Sep 28, 2024 at 8:00 PM
    #93
    Dm93

    Dm93 Test Don't Guess

    Joined:
    Mar 3, 2015
    Member:
    #150066
    Messages:
    12,324
    Gender:
    Male
    Texas
    Vehicle:
    2014 DC OR 6spd 4x4
    Predator tube steps, Ranch Hand grill guard, Magnaflow CatBack exhaust, Toyota tool box & bed mat, 2LO Module by @Up2NoGood, Rearview Compass/Temp Mirror, Tune by @JustDSM.
    Well not exactly, these are inputs to the Body ECU. The Body ECU contains drivers (transistors) that provide ground to the relays when it sees the correct inputs.
     
  14. Sep 28, 2024 at 8:01 PM
    #94
    TnShooter

    TnShooter The TacomaWorld Stray

    Joined:
    Sep 2, 2010
    Member:
    #42625
    Messages:
    20,598
    Gender:
    Male
    First Name:
    Deogee
    Vehicle:
    07' TRD Off-Road, Auto
    STOCK
    That's how a relay works.
    You will have voltage on the wire.
    It's going through the coil.
    A relay is just a magnetic coil. Nothing more.
    Once you ground the wire, it will go to 0v.

    The Head relay sends power to the Dim relay.
    That power travels through the coil and to the ground wire.
     
  15. Sep 28, 2024 at 8:08 PM
    #95
    farmerjj

    farmerjj [OP] Well-Known Member

    Joined:
    Aug 22, 2024
    Member:
    #455676
    Messages:
    86
    Gender:
    Male
    Vehicle:
    2007 Tacoma 4.0L 4WD
    If this issue ends up being inside the engine compartment fuse box, could I just install toggle switches for headlights and maybe turns?
    Or would that be too complicated, or make the truck un-inspectable?
     
  16. Sep 28, 2024 at 9:15 PM
    #96
    Dm93

    Dm93 Test Don't Guess

    Joined:
    Mar 3, 2015
    Member:
    #150066
    Messages:
    12,324
    Gender:
    Male
    Texas
    Vehicle:
    2014 DC OR 6spd 4x4
    Predator tube steps, Ranch Hand grill guard, Magnaflow CatBack exhaust, Toyota tool box & bed mat, 2LO Module by @Up2NoGood, Rearview Compass/Temp Mirror, Tune by @JustDSM.
    I suppose you could for the headlights but I don't see the issue being there as there is no circuitry inside the underhood fuse box, the wires go direct to the terminals in there.
     
  17. Sep 29, 2024 at 3:16 PM
    #97
    farmerjj

    farmerjj [OP] Well-Known Member

    Joined:
    Aug 22, 2024
    Member:
    #455676
    Messages:
    86
    Gender:
    Male
    Vehicle:
    2007 Tacoma 4.0L 4WD
    Is that the next step, since the DIM relay seems to be part of the problem?
    Just stick 2 separate grounded wires in pins 9 and 10?
    I only have one test light.
     
  18. Sep 29, 2024 at 4:02 PM
    #98
    Dm93

    Dm93 Test Don't Guess

    Joined:
    Mar 3, 2015
    Member:
    #150066
    Messages:
    12,324
    Gender:
    Male
    Texas
    Vehicle:
    2014 DC OR 6spd 4x4
    Predator tube steps, Ranch Hand grill guard, Magnaflow CatBack exhaust, Toyota tool box & bed mat, 2LO Module by @Up2NoGood, Rearview Compass/Temp Mirror, Tune by @JustDSM.
    I'd use 2 needles or paper clips and then go across them with the test light.

    I don't like using jumper wires on a live circuit because you run the risk of letting the smoke out of something if you poke the wrong wire, with a test light the worst thing that happens is the light lights up.
     
    farmerjj[QUOTED][OP] likes this.
  19. Sep 29, 2024 at 5:31 PM
    #99
    farmerjj

    farmerjj [OP] Well-Known Member

    Joined:
    Aug 22, 2024
    Member:
    #455676
    Messages:
    86
    Gender:
    Male
    Vehicle:
    2007 Tacoma 4.0L 4WD
    Pink wire in IJ1 pin to ground w/ test light, switch on and high beams on = parking lights only.
    Pink + red/white pin 10 to ground w/same = same.
    Red/green at 1I at ECU w/same = same
    Red/green at stalk w/same = same

    But are you saying do this-
    Pink (Headlight) and Red/Green (High Beam) or Red/White & Red/Green at the same time for the Body ECU to activate the High Beams.
    at the ECU? I'm not sure where to ground r/w and r/g at the same time.
    Ground r/w on pass. side and r/g on driver side?

    Edit: duh, at the switch, but then also elsewhere?
     
  20. Sep 29, 2024 at 5:52 PM
    #100
    TnShooter

    TnShooter The TacomaWorld Stray

    Joined:
    Sep 2, 2010
    Member:
    #42625
    Messages:
    20,598
    Gender:
    Male
    First Name:
    Deogee
    Vehicle:
    07' TRD Off-Road, Auto
    STOCK
    Did you test the right side of the IJ1 connector?
    Unplugged, one will go to the ECM, the other goes to ground.

    You need to ground the wires that are showing voltage.
     
    farmerjj[QUOTED][OP] likes this.

Products Discussed in

To Top