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. Oct 1, 2024 at 9:23 PM
    #141
    Dm93

    Dm93 Test Don't Guess

    Joined:
    Mar 3, 2015
    Member:
    #150066
    Messages:
    11,281
    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.
    Ah maybe we found our problem, so we don't have a ground on the White/Black wire at the switch?

    upload_2024-10-1_23-24-23.png
     
  2. Oct 1, 2024 at 9:24 PM
    #142
    TnShooter

    TnShooter The TacomaWorld Stray

    Joined:
    Sep 2, 2010
    Member:
    #42625
    Messages:
    19,432
    Gender:
    Male
    First Name:
    Deogee
    Vehicle:
    07' TRD Off-Road, Auto
    STOCK
    If you
    If you have power at that the ground wire.
    Than you don't have a good ground.
     
  3. Oct 1, 2024 at 9:52 PM
    #143
    farmerjj

    farmerjj [OP] Well-Known Member

    Joined:
    Aug 22, 2024
    Member:
    #455676
    Messages:
    86
    Gender:
    Male
    Vehicle:
    2007 Tacoma 4.0L 4WD
    No, it did not light up test light with (+) battery connected, so I connected (-) battery to pin 12 and got 9.3V on the digital tester.
     
    Dm93[QUOTED] likes this.
  4. Oct 1, 2024 at 9:54 PM
    #144
    Dm93

    Dm93 Test Don't Guess

    Joined:
    Mar 3, 2015
    Member:
    #150066
    Messages:
    11,281
    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.
    Lets ground that pin through an incandescent test light and see if everything works.
     
    farmerjj[QUOTED][OP] likes this.
  5. Oct 1, 2024 at 10:04 PM
    #145
    farmerjj

    farmerjj [OP] Well-Known Member

    Joined:
    Aug 22, 2024
    Member:
    #455676
    Messages:
    86
    Gender:
    Male
    Vehicle:
    2007 Tacoma 4.0L 4WD
    The tester bulb does not light up, but the parking lights come on?
    :annoyed:
     
  6. Oct 1, 2024 at 10:06 PM
    #146
    Dm93

    Dm93 Test Don't Guess

    Joined:
    Mar 3, 2015
    Member:
    #150066
    Messages:
    11,281
    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.
    Is your switch in the park light position?
     
    TnShooter likes this.
  7. Oct 1, 2024 at 10:07 PM
    #147
    TnShooter

    TnShooter The TacomaWorld Stray

    Joined:
    Sep 2, 2010
    Member:
    #42625
    Messages:
    19,432
    Gender:
    Male
    First Name:
    Deogee
    Vehicle:
    07' TRD Off-Road, Auto
    STOCK
    Doubtful, as the original issue was parking lights, but no headlights…….
    But let’s hope they were just in park….
     
  8. Oct 1, 2024 at 10:09 PM
    #148
    Dm93

    Dm93 Test Don't Guess

    Joined:
    Mar 3, 2015
    Member:
    #150066
    Messages:
    11,281
    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 I mean we definitely found a problem because Pin 12 (White/Black) of the switch should be ground at all times...
     
    TnShooter[QUOTED] likes this.
  9. Oct 1, 2024 at 10:13 PM
    #149
    farmerjj

    farmerjj [OP] Well-Known Member

    Joined:
    Aug 22, 2024
    Member:
    #455676
    Messages:
    86
    Gender:
    Male
    Vehicle:
    2007 Tacoma 4.0L 4WD
    In full-
    Key off, HEAD shows 12V on 2 and 5, nothing on 1.
    Key on HEAD 2 and 5 still 12V, pin 1 shows 2.71V.
    Readings from HEAD do not change, DIM in or out, switch in any position.

    DIM shows power on pin 1 even with HEAD removed. When HEAD is replaced, DIM pin 1 goes from 10.2V to 9.8.
    DIM pins 4 and 5 show 12V when connected to (+) battery, but only with HEAD in.

    Thanks a lot y'all, I'm getting sleepy, good luck, back in the AM.
     
    Dm93 likes this.
  10. Oct 1, 2024 at 10:13 PM
    #150
    TnShooter

    TnShooter The TacomaWorld Stray

    Joined:
    Sep 2, 2010
    Member:
    #42625
    Messages:
    19,432
    Gender:
    Male
    First Name:
    Deogee
    Vehicle:
    07' TRD Off-Road, Auto
    STOCK
    Yeah. I know.
    But why does/did the parking lights work?
    But not the head lights.

    I believe OP said the parking lights have always worked?

    It’s the same ground wire………?
     
  11. Oct 1, 2024 at 10:17 PM
    #151
    Dm93

    Dm93 Test Don't Guess

    Joined:
    Mar 3, 2015
    Member:
    #150066
    Messages:
    11,281
    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've seen missing grounds do some weird shit so who knows but if the OP is on Pin 12 of the switch and the ground is missing we're onto something.
     
  12. Oct 1, 2024 at 10:18 PM
    #152
    farmerjj

    farmerjj [OP] Well-Known Member

    Joined:
    Aug 22, 2024
    Member:
    #455676
    Messages:
    86
    Gender:
    Male
    Vehicle:
    2007 Tacoma 4.0L 4WD
    No, only get parking lights with switch full on, high/low/flash made no difference. I think I tried flash, will check again tomorrow..
     
    TnShooter likes this.
  13. Oct 1, 2024 at 10:22 PM
    #153
    TnShooter

    TnShooter The TacomaWorld Stray

    Joined:
    Sep 2, 2010
    Member:
    #42625
    Messages:
    19,432
    Gender:
    Male
    First Name:
    Deogee
    Vehicle:
    07' TRD Off-Road, Auto
    STOCK
    How on earth is there power to pin 1 of the dimmer relay, WITHOUT the headlight relay being in?
    The head relay feeds power to pin 1 of the dimmer?


    WTF?…….Now I’m confused.:confused:
     
  14. Oct 2, 2024 at 6:46 AM
    #154
    farmerjj

    farmerjj [OP] Well-Known Member

    Joined:
    Aug 22, 2024
    Member:
    #455676
    Messages:
    86
    Gender:
    Male
    Vehicle:
    2007 Tacoma 4.0L 4WD
    I believe IA1 pin 30, yellow/black, is connected to DIM pin 1, and IA1 pin 29 is connected to HEAD pin 2?
    So... pins 29 and 30 maybe are shorted to each other, and a 12V power source?
    The 2.7 at HEAD 2 and 9.7 at DIM 1 do add up to 12.4 volts...but I didn't think electricity acted like that.
     
  15. Oct 2, 2024 at 8:56 AM
    #155
    farmerjj

    farmerjj [OP] Well-Known Member

    Joined:
    Aug 22, 2024
    Member:
    #455676
    Messages:
    86
    Gender:
    Male
    Vehicle:
    2007 Tacoma 4.0L 4WD
    There's an extra wire, not shown here, at the headlight/C11 combo switch.
    Pin 18 has a dark green wire which is showing 9.7V of power, same as DIM ground pin 2.
    Ooh! Found it in spreadsheet. It also shows 10.4V at ECU B5 pin 13.

    Reminder, a new headlight switch didn't change a thing when plugged into the clip.

    IJ1 pin 8 = Tail Light Switch Signal from Combination Switch (C11 Pin 18) to Body ECU (B5 Pin 13)


    upload_2024-10-2_11-44-1.png
     
  16. Oct 2, 2024 at 9:17 AM
    #156
    TnShooter

    TnShooter The TacomaWorld Stray

    Joined:
    Sep 2, 2010
    Member:
    #42625
    Messages:
    19,432
    Gender:
    Male
    First Name:
    Deogee
    Vehicle:
    07' TRD Off-Road, Auto
    STOCK
    The IA1 pin 30 (Y/B wire) is connected to pin 2 of the Dim. Not pin 1.
    IA1 pin 29 (White) goes to pin 1.

    Also, where are you testing your ground from?
    A body bolt, battery terminal, or from a ground wire?
    upload_2024-10-2_12-12-16.pngupload_2024-10-2_12-13-40.png
     
    Last edited: Oct 2, 2024
  17. Oct 2, 2024 at 9:21 AM
    #157
    TnShooter

    TnShooter The TacomaWorld Stray

    Joined:
    Sep 2, 2010
    Member:
    #42625
    Messages:
    19,432
    Gender:
    Male
    First Name:
    Deogee
    Vehicle:
    07' TRD Off-Road, Auto
    STOCK
    And the Dark Green wire at Pin 18 is for the taillights. AKA - Parking lights
    upload_2024-10-2_12-21-23.png
     
  18. Oct 2, 2024 at 9:22 AM
    #158
    farmerjj

    farmerjj [OP] Well-Known Member

    Joined:
    Aug 22, 2024
    Member:
    #455676
    Messages:
    86
    Gender:
    Male
    Vehicle:
    2007 Tacoma 4.0L 4WD
    I typed it backwards, the spreadsheet says 29 goes to HEAD 1 and 30 goes to DIM 2?
    (+)Battery terminal.
     
  19. Oct 2, 2024 at 9:29 AM
    #159
    farmerjj

    farmerjj [OP] Well-Known Member

    Joined:
    Aug 22, 2024
    Member:
    #455676
    Messages:
    86
    Gender:
    Male
    Vehicle:
    2007 Tacoma 4.0L 4WD
    Shouldn't the green one be 12V? Instead of 9.7V @ C11 pin 18 and 10.3V @ B5 pin 13?
     
  20. Oct 2, 2024 at 9:31 AM
    #160
    TnShooter

    TnShooter The TacomaWorld Stray

    Joined:
    Sep 2, 2010
    Member:
    #42625
    Messages:
    19,432
    Gender:
    Male
    First Name:
    Deogee
    Vehicle:
    07' TRD Off-Road, Auto
    STOCK
    It does, I was wrong above.
    I fixed it.

    IA1-29 goes to pin 1 of Head Relay.
     

Products Discussed in

To Top