"dipped beam failure" Both low beams will not illuminate. Replaced both lights. Checked and verified connections. Replaced both relays on board. Did not fix. Dealer says replace computer. Very expensive fix with 150000 miles on car. Can you just wire lights to a separate switch? For example the fog lamp switch or the anti collision switch?
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High Beam Headlamp Operation
Battery voltage is applied at all times to the coil and switch sides of the HIGH BEAM PCB Relay located in the underhood fuse block. When the headlamp dimmer switch is placed in the high beam position, the headlamp dimmer switch signal circuit to the BCM is pulled low signaling the headlamp high beam request. In response to this signal, the BCM applies ground through the high beam relay control circuit energizing the high beam relay. With the high beam relay energized, battery voltage is applied through the switch side of the relay, the left and right high beam fuses, and the high beam supply voltage circuits illuminating the high beam headlamps. At the same time the BCM sends a GMLAN serial data message to the instrument panel cluster (IPC) requesting the IPC to illuminate the high beam indicator. Ground for the left headlamp is provided at G101 and the right headlamp at G100.
May not be the bulb or fuse..could be the switch... dipped beams illuminate via voltage from the turn signal...Check your wiring and sockets and grounding . Dipped beams are usually near the bottom front fascia of the car . If there is not a shield there, any debris can cause corrosion, or chafing of wires and connections.
the bulbs are set in the reflector to get maximum illumination and cannot be adjusted. What you have to adjust is high beam and the low beam will be automatically adjusted. Th adjust high beam (after dark) place the vehicle on level ground about 3 feet from a wall. Turn on high beam and you will notice where the centre of the beam is on the wall That centre has to be slightly below the centre of the lights ( about 1 inch) The centre should be directly in front of the lights and not out to the side of the vehicle. When the lights are correctly adjusted then low beam will be in the correct position.
about troubleshooting your headlights on your vehicle. I would isolate the wire that comes from the headlight switch to the headlamp bulbs for low beam and check to see if there is a short in the wire. You can find this wire by using a test light turn on the key and get a good ground with the test light poke the wire and see if the test light illuminates with the headlight switch on. ----Also check the wires, and check the fuse for your low beams. could of blown a fuse on your lows, but your highs will still work. Every single time I have had a failure of low beam in a headlight without failure of high beam, it has been because the lamp bulb or halogen lamp module has reached the end of its serviceable life, not because of any wiring problems. Low beam burns out first because it is on the most. If low beam is lost simultaneously in both headlights, I would check fuse first, then the headlight switch. If low beam is lost on one side only, it is almost always going to be due to the bulb or lamp module needing to be replaced. In that case, replace them in both headlights because the other one will be going kaput in short order, as well. There is something to check. Does the low beam relay click when you turnt he low beams on? if it does not click then Then find the BCM at the base of the steering column. In there find the grey connector and in there, find the pink/white wire in terminal A4. Use a wire to jump that wire to ground. IF the low beams come on, then it is likely the BCM is bad. Also check a bad wire between the fuse block and the BCM. before replacing the BCM . Start under the fuse block. This is the fuse block under the hood. This will
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hi from uk provided you have checked bulbs are ok? then this fault may be the relay for the low /dipped beam has gone faulty if you check h/book you may find location of low beam relay there is relay for high and one for low beams if you find both relays ? try switching? this will confirm relay fault if you then have low beam but no high ? b4 you buy new relay other than tis the other possible fault may be the actual di/high beam stick control ?