Question about Lexus ES 300

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My RH low beam is out, I though it was the lightbulb so I bough an identical Phillis light bulb put it on and nothing. I checked the #15 fuses to the RH side lowbeam and its good. the headlamp relay fuse in the fuse box ( 4 prong) i believe works because if I remove it the LH low beam that works does go off, My question is what esle could it be? is the headlamp relay fuse a two part system that it could be partially out and make the LH side lowbeam work but the RH side low beam be out?

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  • ga76 Aug 10, 2010

    I will try to resolve my problem on my 2001 Lexus es 300 RH low beam I will check the wiring, Thanks for the info

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  • Lexus Master
  • 11,800 Answers

No, single relay for both low beam bulb. Check the wiring at the RH lb side - either a wire is broken (or the grounding is corroded) or the clamps in the bulb socket are deformed (or corroded). 

Posted on Aug 07, 2010

  • ga76 Aug 07, 2010

    when you say the clamps do you mean the clamps that hold the light bulb in place or the actual wiring inside the socket that connects with the lightbulb?

  • Azrael SRL Aug 08, 2010

    The wires, to the bulb, this problem is strictly electrical.


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1 Answer

Low beams dont work and only one high beam works


Do you know how to do voltage drop testing ? Leave the blubs in there sockets turn the low beams on , measure voltage on the power side , LH low beam yellow with black stripe an for the RH low beam dark blue wire . If you have battery voltage there, power side is good . Then check ground side both are yellow wires , test with lights on . if you see 6 volts , 12 volts .anything more then .03 millivolts you have a ground side problem . The lights ground through the light switch .
Low Beam
Voltage to the headlamp switch is available at all times from the HDLP SW fuse 7 through CKT 1940 (ORN). When the headlamp switch is turned to the HDLP position, the headlamp power relay coil is energized through CKT 352 (WHT). A signal is also sent to the body control module (BCM) that the headlamp switch is ON. When the headlamp switch is in the AUTO or PARK position, the ambient light sensor (located in the right speaker grill) senses either daylight or darkness and sends the signal to the BCM. When the Ambient Light Sensor detects a dark condition, the BCM produces a signal that will energize the headlamp power relay through CKT 352. The relay coil is grounded through terminal F7 connector 2 of the underhood fuse block to CKT 350 (BLK) to G102. When the headlamp power relay is energized the relay supplies power to the LT HDLP and RT HDLP fuses. The RH low beam headlamp receives current through CKT 198 (DK BLU) from the RT HDLP fuse. The LH low beam headlamp receives current through CKT 712 (YEL/BLK) from the LT HDLP fuse. Both headlamp low beam bulbs are grounded by CKT 524 (PPL) through the underhood fuse block to the multifunction switch (low position) contacts through CKT 10 (YEL) to the headlamp grounding relay in the body relay block through the normally closed contacts to CKT 1850 (BLK) to G200.

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1 Answer

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Do the high beams work?

The ground point is on the apron ( the inside of the fender, just behind the headlight). There is one on each side. From the wiring diagram, there is just a splice connecting power to the lights in parallel for the high and low beams, but the grounds are separate.

If the RH high beam and the LH low beam works, then it is not a ground problem. You could just tap the LH wires to power the RH, but I think that if you look closely the connector for the bulb is probably melted. If that is the case then you will have to splice on a new connector.

The colors are as follows:

RH --> low beam power ( light blue)
LH --> low beam power (white OR light blue)
BOTH high beams --> ( red/white stripe)
Ground --> Black

Sorry, The diagram is too large a file to upload.

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check for a damaged wire for the low beam. Also wouldn't hurt to check the ground wire as the high beam will try and ground through the low beam but not visa verse

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1 Answer

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1 Answer

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The headlamp circuit is rather simple. From the 15 amp RH headlamp fuse, there is a red w/yellow trace that goes to the RH high beam. Out of the 15 amp LH headlamp fuse, the wire going to the LH Hi beam is solid red. Both of these wires should have power when the headlamp relay is energized. The wires from the Hi Beam bulbs going back to the switch should both be red w/black trace. The wire going from the headlamp relay to power the 2 15 amp fuses is white. The headlamp switch applies a ground to illuminate either the Lo Beams or the Hi Beams.

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1 Answer

Both high beams do not work, but low beams do.


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Both your low beam and your high beam is protected by the same fuse, so it makes sense that the fuse is OK if the high beam is working on the passenger side. There are 3 fuses for the headlamps. Fuse #13 in the Battery Junction Box (20 Amp). If this fuse is blown, the headlamp relay will not have any power and neither high nor low beam on either side will work (you will have no headlamps at all) Then there is Fuses #2 and #3 (15 Amp) in the Battery Junction Box. #2 goes to the left low and high beam and #3 goes to the right low and high beam.
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1 Answer

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