Question about 2001 Chevrolet Silverado 1500

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Lost low and high beams on 2001 silverado

No headlights all other lights work. Fog,running,tail,brake... son says lights were slow to come on one day but came on after several seconds, also shut off once while driving for a couple of seconds, worked fine the rest of the night. Now nothing. Fuses look good. Any suggestions?

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Fisrt of all you must determine if you are getting power to headlight switch. You'll need to pull to the dash panel out to get to the switch. Be careful to disable your air bags when working around the dash.With a test l;ight probe your connector on the back of the switch. You should have one battery powered wire . You probably do since you said your running lights work. Turn on your running lights only at fisrt. Probr the plug again. You should have power out on one terminal only. Then try your headlights, if you have power on the other terminals that didn't work with only running light, your switch should be fine. I'm betting that your problem is in your dimmer switch. I have repaired this problem many many times because of bad dimmers. Under the dash you will need to remove the plastic cover(typically held on with 7mm screws and push pin type connetors.). On the left side of your steering column there will be a switch with a single connector that has several wires in it. Look at the end closest to the steering wheel. You should see a rod about 3/16 diameter contacting one end of the switch.That's your dimmer switch.Carefully place a piece of masking tape on the rod to hold it in place. Unplug wire onnnector and then remove the two screws that hold it to the column.Look to see if there is any burnt wires/connectors there. If not probe the switch with your test light. Remember one power in and should have one power out on each beam. (possibly two on high beam for indicator) If no power out on any position of dimmer, it's bad replace it. If you do the problem is between the dimmer and he headlights.I doubt this is the case. When replacing your switch, make sure that you test the physical function of the switch before you install the cover etc.There is some room for adjustment where the screws mount it to the column. I've done this dozens of times and hope this helps you.

Posted on Dec 29, 2008

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248015_1_103.jpg

Fuse locations for options not shown can be found in the corresponding wiring diagrams.
Amp.


1 - Headlight, Low Beam, Left (56b) 10
2 - Headlight, Low Beam, Right (56b) 10
3 - License Plate Lights (5icon_cool.gif 10
4 - Rear Window Wiper And Washer System 15
5 - Windshield Wiper/Washer 15
6 - Fresh Air Blower, A/C (X) 20
7 - Tail Lights, Right (58R) 10
8 - Tail Lights, Left (58L) 10
9 - Rear Window Defogger 20
10 - Fog Lights 15
11 - Headlight, High Beam, Left (56a) 10
12 - Headlight, High Beam, Right (56a) 10
13 - Horn (15) 10
14 - Back-Up Lights 10
15 - Engine Electronics (15) 10
16 - Power Sunroof, Front Map/Reading Light 15
17 - Emergency Flashers (15) 10
18 - Fuel Pump (FP), Heated Oxygen Sensor (HO2S)
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19 - Coolant Fan, A/C Relay (30) 30
20 - Brake Lights (30) 10
21 - Interior Lights, Clock, Luggage Compartment
Light (30) 15
22 - Cigarette Lighter, Radio, Luggage Compartment
Release 10

Separate Fuses

(Located above the relays)



- Fuse for ABS hydraulic pump relay 30
- Fuse for ABS main relay 30
- Fuse for A/C 30
- Fuse for power windows 20
- Fuse for cruise control 5
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