Question about 2001 Toyota Tacoma

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My head lights only work on high beam. if i switch to low they will cut off. all of my dash lights work regardless. any ideas of what may be causing it???

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  • ttooley Sep 12, 2008

    I just checked all of my fuses on the fuse panel by the drivers door kick plate and all are good. Looking for a relay or switchor hidden fuse as suspect. Just started surfing the web to look for ideas to test. My high beam indicator dosn't come on. Does yours? Just happened last night.

  • clinjen Oct 04, 2008

    I have the exact same problem. I have checked all my fuses and they seem good. This happened on a 1990 Toyota truck I owned and the solution seemed to jump some switch that was located under the steering column. My brother is an electrician and did some tests then added another wire. Presto, the lights worked. Don't know what he did. Any thoughts?

  • bozinc94 Oct 19, 2008

    I am having the same problem now. My headlights only work on full beam. Have swapped fuses but no change...did anyone find a solution?

  • tacotaco85 Nov 12, 2008

    yeah mine is doing the same thing....have you repaired this yet?

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Thanks cyblet!
I didn't think it was such a simple problem, but i usually drive with the low beams on all the time....turns out they were both blown out, and the high beams left in tact....solved the problem for about $22 in new bulbs.

Posted on Nov 19, 2008

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Your headlights have two bulbs in them one for low beam and one for high beam. I bet the low beam bulb is burnt out on both headlights. It's not uncommon to have a bulb go out at 50000 miles. I would change 1 light and see if it now works or take it to a local mechanic and have them check it.

Posted on Nov 19, 2008

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It is entirely possible for both low beams to be out have you verified that there is No voltage on the low beam electrical circuit of the headlights?

Posted on Aug 13, 2008

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Low beam headlights do not work 2010 chevy impala high beams work as do daytime running lights low beams do not work on either automatic mode or manual mode


The headlamps are controlled by the BCM - body control module , do you know what that is ? The headlamp switch is a input to the BCM ,the BCM energizes relays to turn on the headlmps , low beam relay , high beam relay , DRL relay . These relay's are PCB - printed circuit board relay's ( non - serviceable ) If found to be bad the whole under hood fuse box would need to be replaced .
Low Beam Headlamp Operation
The low beam headlamps may be turned ON in 3 different ways:
• When the headlamp switch in the HEAD position for normal operations
• When the headlamp switch is in the AUTO position, for automatic lamp control (ALC)
• When the headlamp switch is placed in the AUTO position, with the windshield wipers ON in daylight conditions, after a 6 second delay
Battery voltage is applied at all times to the coil and switch sides of the LOW BEAM PCB Relay located in the underhood fuse block. When the headlamp switch is placed in the HEAD position, ground from G202 is applied through headlamps ON switch signal circuit to the body control module (BCM), signaling the headlamps ON request. In response to this signal, the BCM applies ground through the headlamp low beam relay control circuit energizing the low beam relay. With the relay energized, battery voltage is applied through the switch side of the relay, the left and right low beam fuses, and the low beam supply voltage circuits illuminating the low beam headlamps. Ground for the left headlamp is provided at G101 and the right headlamp at G100.

Do you know what B codes are ? BCM - DTC'S - diagnostic trouble codes , need a factory scanner or professional one to view these codes , not autozone or advance etc....Having a qualified repair shop check your vehicle would be your best bet.

DTC B2575 00: Headlamp Control Circuit

Circuit/System Description
The vehicle headlamps are controlled by the body control module (BCM) based on inputs from the headlamp switch and the turn signal/multifunction switch. The headlamp switch has four positions: Off, Auto, Park, and Headlamps. The default headlamp switch position is Auto, in which the BCM uses the ambient light sensor to determine when headlamps are needed. The Off portion of the headlamp switch is a momentary switch which overrides the automatic headlamps and will turn off the vehicle headlamps. When in the Off position, the headlamp switch grounds the headlamp switch headlamps off signal circuit, prompting the BCM to turn off the headlamps. The Park position of the headlamp switch will only illuminate the vehicle parking lamps. The Headlamp position of the headlamp switch will illuminate both the parking lamps, as well has the headlamps. With the headlamp switch in the Headlamp position, the headlamp switch headlamps on signal circuit is grounded, prompting the BCM to turn on the headlamps, regardless of other factors such as ambient light.
The headlamp high beams are controlled through the flash to pass switch and the headlamp dimmer switch, both located in the turn signal/multifunction switch. The flash to pass switch is a momentary type switch, designed to illuminate the high beams as long as the switch is held. With the switch closed, the flash to pass switch signal circuit is grounded, prompting the BCM to turn on the high beam lamps. The headlamp dimmer switch allows the operator to select between full time high or low beam operation. Unlike the flash to pass switch, it is not a momentary switch. When the headlamp dimmer switch is in the high beam position, the headlamp dimmer switch high beam signal circuit is grounded. This prompts the BCM to turn on the high beam lamps.
The BCM controls the headlamps based on the inputs explained above. When a low beam request is received, the BCM grounds the headlamp low beam relay control circuit. This energizes the coil in the LOW BEAM PCB relay, causing the relay switch to close. This then applies B+ to both low beam headlamps through the LT LO BEAM and RT LO BEAM fuses, illuminating the low beam headlamps. When a high beam request is received, the BCM grounds the headlamp high beam relay control circuit. This energizes the coil in the HIGH BEAM PCB relay, causing the relay switch to close. This then applies B+ to both high beam headlamps through the LT HI BEAM and RT HI BEAM fuses, illuminating the high beam headlamps

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2005 impala lowbeams do not work at all. high beams, turn signals, and taillights are fine. i cut the negative and grounded it on the car and now the headlights are on but will not shut off unless i take...


ok put the ground back were you cut it and remove bezel near head light switch test powers in and out with 12 volt test light on low beam and high beam you may just have a bad head light switch make sure you have headlight power coming out of the swicth for low beams.

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