Question about 2000 Jeep Grand Cherokee

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Head lights not working

Low beams are out turn signals and emergency signals are out,but high beams

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  • Anonymous Mar 16, 2014

    you turn on the head lights and the low beams don't work but if you turn on the high beams they do work .

  • Anonymous Mar 31, 2014

    when i turn on left turn signal high beams come on

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  • Master
  • 1,066 Answers

Check your relays, they are like big fuses in your engine compartment, if your low beam and high beam relays are the same model, switch them and see if this enables low beams and disables the high beams. if it not the relays, or fuses, then it is probably your wiring harness, an expensive repair.

Posted on Nov 28, 2008

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Posted on Jan 02, 2017

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1 Answer

2007 chev sub head lights wont turn on


Do you know anything about automotive electronics ? Electronic control modules .
Headlamp ON/OFF control is determined by the body control module (BCM) by a signal on the headlamp switch on input circuit when the headlamp switch is in the HEAD position. When the headlamp switch is in the AUTO position, the BCM determines headlamps ON/OFF by the voltage from the ambient light sensor.
If the headlight switch is left in the ON position, the inadvertent power control feature will turn OFF the headlights approximately 10 minutes after the ignition switch is turned to the OFF position. If the driver places the headlight switch in the ON position after the ignition switch has been turned OFF, or if the ignition switch is in the ACCY position, the headlights will remain ON until turned OFF or the battery runs dead.
The high beam indicator is illuminated when the instrument cluster receives a GMLAN serial data message from the BCM that the high beams are illuminated.
High Beams
The high beam headlamps receive voltage from the headlamp high relay located in the underhood fuse block. The BCM controls the relay on the headlamp high beam relay control circuit. High beam control is determined by a signal on the headlamp dimmer switch signal circuit from the multifunction switch. When the headlamp dimmer switch signal circuit is grounded, the BCM grounds the headlamp high beam relay control circuit, illuminating the high beam headlamps. The right and left high beam circuits are independent and are fused independently in the underhood fuse block.
Low Beams - Standard
The low beam headlamps receive voltage from the headlamp low beam relay located in the underhood fuse block. The BCM controls the relay on the headlamp low beam relay control circuit. Low beam control is determined by a signal on the headlamp dimmer switch signal circuit from the multifunction switch. When the headlamp dimmer switch signal circuit is open, the BCM grounds the headlamp low beam relay control circuit, illuminating the low beam headlamps. The right and left low beam circuits are independent are fused independently in the underhood fuse block.

Hooking up a factory scan tool an checking DTC'S - diagnostic trouble codes would be the very first step in trouble shooting this problem .
DTC B257A 00: Headlamp Switch Input Signal Mismatch
DTC 2575 00: Headlamp Control Circuit

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Check your fuses first and then check your hazard flasher relay. As for your high/low beams, could be your head light switch itself.

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1 Answer

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Check the fuses first. then replace the turn signal switch if all fuses are good. All the lights run threw it, except the high brake light on the rear.

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I would want to know if each circuit has power at the switch that controls it.

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the head lights have tree wires goig to it one groun one gets power when high beams on the 3rd gets power only with low beam on test the wires or try by plugin a good known head light to conector if it works with low beam then replace both head ligts because head light come with two bulbs in one high and low

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