Question about 2002 Toyota Tundra

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Night heads lights not switching on.

Engine started up, turned head light switch on, but, only the parking and dash lights came on, after many attempts. The high beams worked when switched on, so I tried turning off engine, restarting, and removing key, and still no head lights. Could this be a fuse, and why only low beams?
Baffled.

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Look for a plug in relay in the fuse box under the hood.

Posted on Jul 29, 2009

  • Crap Iemael
    Crap Iemael Aug 04, 2009

    Relay in fuse box under hood.

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1 Answer

How to turn bright lights off on 2003 cts


Could be a bad dimmer switch or a stuck high beam relay or the ( DIM ) dash integrated module .
Headlamp Low or High Beams Always On

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  1. Turn the headlamp switch to the OFF position.
  2. Verify that the transmission shift lever is in the PARK position for vehicles equipped with automatic transmissions or the parking brake is applied for vehicles with manual transmissions.
  3. Expose the sunload sensor to a bright light.
  4. Turn the windshield wipers to the OFF position.
  5. Turn ON the ignition, with the engine OFF.
Are the head lamps ON? YES or NO

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  1. Turn OFF the ignition.
  2. Install a scan tool.
  3. Turn ON the ignition, with the engine OFF.
  4. Turn the headlamp switch to the OFF position.
  5. With a scan tool, observe the Head Lamp Switch parameter in the Dash Integration Module (DIM) Inputs data list.
Does the scan tool indicate that the Head Lamp Switch parameter is OFF?
I would think you probably don't have a GM Tech 2 factory scan tool , this is a very involved diagnostic flow chart an you can't diagnose it very easily without the factory scan tool . You could replace parts an get lucky . I would start with the high beam relay in the under hood fuse / relay center . Do you know what a relay is , not to talk down to you because I don't what you know . The relay is energized by the DIM - dash integrated module . You may want to take this to a ASE certified repair shop or the dealer !
I would



Or
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i assume you have checked all lighting fuses. if you have not, start there. do you have brake lights? if you do have brake and head lights then i would suspect the dimmer/light switch.

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