Question about Toyota Tundra

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Integration relay I tried to bypass my fog light switch in my 02 toyota tundra into a two way switch. I smelt smoke, disconnected it and now my headlights wont come on only drl and high beams manually on the switch. I checked all fuses, swaped relays and changed headlight switch..nothing. I have no power to the four fuses for the head lamp circuit when the key is on and switch is on. I only have power to the drl fuse and the high beam fuse when manually turned on by the switch. Please help

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Check the lamp itself to be sure it isnt burned out... check the main fuse and relays under the hood... check for bad wires throughout the lighting system (time consuming and tedius)

Posted on Feb 11, 2014

Testimonial: "I have day time running lights working all the time, high beams come on when I manualy flash beams but when I turn headlights on I get nothing and high beam wont stay on when selected and drl stays on throughout so I know lamps are fine? I pulled relays and checked continuity all is good. I pulled all fuses and tested with test light all is good and have checked some wiring and everything seems ok. I noticed when my headlight switch is on there is no power going through all four fuses for hi/lo head lamps, only drl. The high beam fuses only have power when I manually flash high beams. I feel a switch or something has burned out in the system but not sure where? I thought if I burned a wire nothing would work but I can still activate the highs with the head light switch manually so that circuit is fine? Frustrating"

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  • keith29717
    keith29717 Feb 11, 2014

    is it possible that you didnt rewire the bypass back to the switch correctly?

  • Trevor
    Trevor Apr 07, 2014

    No I sent high amps through something...I have pulled everything apart and checked wiring for burnt or frayed wire, nothing found I swaped drl modual and same problem. I pulled out fuse block under the dash and no signs of burnt or damage. I have checked all grounds and all is fine. I know there is diodes under the dash and I have yet to find and check them. I have the factory fog lamp switch in now and if I use jumper wire at the relay they will light up so I know that system is working..I'm only running on dlr right now and flash to pass works but no low beams. I feel I have narrowed it to a diode or something in the integration relay has burnt out which no physical signs of damage are present. I have yet to bypass the intergration realy to isolate and rule that out, its my next step..I was hoping someone experienced something similar that would give me some direction!!

  • Trevor
    Trevor Apr 07, 2014

    When I tried to wire in a two way off the factory fog light wire harness I didnt realize that toyota uses ground to complete the circuit so I know my problem is switching, so many components are involved in switching on headlights.

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SOURCE: Daytime Running Lights Inoperative 2002 Toyota Camry

[Information] For a 2002 Toyota Camry, the Daytime Running Lights (DRL) operate utilizing the High Beams (inner Lamps closer to the center of the vehicle front) at a reduced power.

[The troubleshooting process:] Review the Owner's Manual and ensure the test configuration matches the following criteria:
1. According to the 2002 Toyota Camry Owner's Manual (Check your Owners Manual):
"The DRL system will make your headlights come on at a reduced brightness when:
The light switch s in the "DRL" position.
The ignition is on with the engine running.
The headlight switch is off.
The parking brake is released."


2. Set the Test Conditions according to Step 1 above.

3. Check the headlight bulbs to ensure they are not burned out. If one burns out, there is a fair chance that the other would have burned out at the same time. Replace as necessary. In this case, if the high beams operate, the DRLs should also operate.
4. Test the system, ensuring the step 1 conditions are set. (Engine running, Multi-function Switch on Turn Signals in "DRL" position, headlight switch off (repeating what the manual says -- it should be obvious that in the "DRL" position, the headlight switch should be off / do not have the switch positioned to "High Beam"), and the Parking Brake "off").
5. If DRL lights do not work, check the engine compartment Fuse and Relay Box. there is a 5 Amp DRL fuse -- replace it with the spare. Test (step 4).
6. If it does not work, swap around or replace relays -- there are three (3). Any one of them could be bad (stuck or burned out). Test (step 4).
7. Other less likely possible issues could be that the Multi-function Switch is broken or a connection / wire is broken. [Beyond the scope of this process.]


My problem was that the test configuration did not have the engine running and parking brake off - Step 1. Problem solved with much thought, repetitive tests on the vehicle and going back to the basics -- what does the Owner's Manual say and where are the applicable fuses and relays located?

Posted on Jan 01, 2012

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