Question about 2002 GMC Envoy

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HEADLIGHT LOW BEAMS

BOTH RT & LT LOW BEAMS NOT WORKING. CHECKED FUSES AND LIGHTS BOTH ARE GOOD.

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  • Anonymous Nov 24, 2008

    Same problem. Checked fuses and changed both bulbs. No luck.

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Check the wiring to the bulbs, mine melted.

Posted on Nov 05, 2008

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2003 yukon XL one headlight is not getting power, how do i troubleshoot?


If low and high beam both are failing to work check the ground for that side . If high or low one works and the other does not check the fuse for that beam as it has 4 fuses one for each side and low and high. The fuses are in the underhood fuse block . Marked as LO HDLP LT, HI HDLP LT, LO HDLP RT and HI HDLP RT . They are 10 amp fuses .

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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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Free wiring diagrams


http://www.bbbind.com/technical.html
Free wiring diagrams and TSB's for every make and model. Hope it helps you.

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1 Answer

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1 Answer

The RT low beam does not work on my 1992 SL1. I used a test light to confirm that there is power going to the plug end, but when you turn the headlights on, there is no longer any power going to the plug....


if one side works, but not the other, your problem is not in the multifunction switch.
i would make darn sure that the headlight wiring harness has a good ground on that side.

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1 Answer

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Make sure the TBC fuse is good in the fuse box under the hood. There is also a Headlamp relay, and fuses marked LT HDLP, and RT HDLP, If the RT HDLP and LT HDLP fuses have power, the headlight switch is good. Be sure battery power is present on both sides on these 3 fuses. If you ground the PURPLE or YELLOW wires at the bulbs, they should light. If they do, the one thing that the high and low beams have in common is the hi-low beam switch and the ground for the switch. The ground ends up at the lower left corner of the dash, under the windshield. The relay is a common relay and you will be able to find another one in the fuse box to swap for testing purposes.

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1 Answer

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