Question about 2004 Chevrolet TrailBlazer

3 Answers

Low beams inop

High beams work but not low

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  • mpark748 Oct 03, 2008

    low beams inop high beams work

  • mpark748 Oct 03, 2008

    TRIED A KNOWN GOOD HADLIGHT SWITCH, LOW BEAMS STILL INOP, IS THERE A DRL MODULE THAT CONTROLS LOW BEAMS?

  • Harley 06 FH Oct 12, 2008

    I'm having the same problem. Low beams do not work but high beams do. Are you pretty sure that it is the headlight switch? I do not have a salvage yard close and want to get this thing fixed.

  • coach ali Dec 11, 2008

    was the relay fuse a dealer part only i have the same proablem checked everything out no fix so far

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It is the micro relay #46 in the power distribution center under hood driver side common problem

Posted on Feb 05, 2009

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Turned out to be the relay in the fuse block under the hood.

Posted on Oct 13, 2008

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If you've verified that the fuses are OK and the bulbs are not blown, it's either a headlight relay (somewhat unlikely - they usually are good for the life of the vehicle, or many years at the least) or the headlight switch itself (more likely). I've seen headlight switches go bad on many vehicles and at all different ages and mileages, so from my own experience I'd lean that way. You can probably get one at a salvage yard for less than $10 and swap it in.

Posted on Oct 03, 2008

3 Suggested Answers

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SOURCE: low beam headlights

Try swapping #45 cooling fan relay and #46 HDM (headlight driver module) relay in the underhood fuse block. These are solid state modules and are not like conventional relays.

Posted on Nov 21, 2008

djicenova
  • 319 Answers

SOURCE: low beam headlights not working

check voltage at switch

Posted on Mar 18, 2009

  • 75 Answers

SOURCE: 1993 Chevy Silverado truck headlights high beam only works no low

dimmer switch has gone bad need to change your dimmerswitch

Posted on Apr 01, 2009

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1 Answer

2012 Chevy Silverado low beam light not working.


Regular headlamps or HID ? Check the HDLP LO/HID relay in the under hood fuse / relay box . Will be marked on the inside of the lid . Do you know what a BCM is ? body control module. Could have DTC'S - diagnostic trouble codes stored .
DTC 2575 00: Headlamp Low Beam Control Circuit
  1. Ignition OFF, disconnect the low beam relay.
  2. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal 87 and ground.
  3. ?‡'
    If the test lamp illuminates, test the control circuit for a short to voltage.

  4. Verify that a test lamp illuminates between the B+ circuit terminal 30 and ground.
  5. ?‡'
    If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.

  6. Verify that a test lamp illuminates between the B+ circuit terminal 86 and ground.
  7. ?‡'
    If the test lamp does not illuminate, test the B+ circuit for an open/high resistance.

  8. Ignition OFF, disconnect the harness connector at the inoperative low beam headlamp.
  9. Ignition OFF, scan tool OFF, exterior lamps OFF, test for less than 5.0 ohms between the ground circuit terminal B and ground.
  10. ?‡'
    If greater than the specified range, test the ground circuit for an open/high resistance.

  11. Connect the harness connector at the inoperative low beam headlamp.
  12. Connect a 40A fused jumper wire between the B+ circuit terminal 30 and the control circuit terminal 87. Verify the low beam headlamps are activated.
  13. ?‡'
    If the low beam headlamps do not activate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the inoperative low beam headlamp.

  14. Connect a test lamp between the B+ circuit terminal 86 and the control circuit terminal 85.
  15. Command the Low Beams ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
  16. ?‡'
    If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM.


    ?‡'
    If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.

  17. If all circuits test normal, test or replace the low beam relay.

May 25, 2016 | Cars & Trucks

1 Answer

I want to take out the high beem fuse for a 2003 buick regal... I lost the car manual


Two fuses HDLP L fuse #36 15amp & HDLP R fuse #32 15amp ,located in the under hood fuse / relay box. One is for Left - low an high beams an the other is for right side low an high beams . What's wrong , no high beams ?
Headlamps Inoperative - High Beams

1

Did you perform the Lighting System Diagnostic System Check?
Go to Step 2
Go to Diagnostic System Check - Lighting Systems

2

  1. Turn the ignition to the OFF position.
  2. Turn the headlamp switch to the HEAD position.
  3. Place the headlamp dimmer switch in the high beam position.
Are the high beam headlamps operating properly?
Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems
yes Go to Step 3


Is only one high beam headlamp inoperative?
yes Go to Step 7
Go to Step 4

4

Place the headlamp dimmer switch in the flash to pass position.
Do the high beam headlamps operate in the flash to pass position?
Go to Step 13 yes
Go to Step 5 no

5

Place the headlamp dimmer switch in the high beam position.
Does the high beam indicator illuminate?
Go to Step 12
Go to Step 6

6

Test for a high resistance, an open or a short to battery positive voltage in the high beam signal circuit of the headlamp dimmer switch. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 17
Go to Step 13

7

  1. Disconnect the inoperative headlamp.
  2. Using a test lamp connected to ground, probe the battery positive voltage circuit of the inoperative high beam headlamp.
Does the test lamp illuminate?
Go to Step 8
Go to Step 9

8

Connect a test lamp between the headlamp high beam signal circuit and the battery positive voltage circuit of the inoperative high beam headlamp.
Does the test lamp illuminate?
Go to Step 11
Go to Step 10

9

Test for a high resistance or an open in the battery positive voltage circuit of the inoperative headlamp. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 17
Go to Step 12

10

Test for a high resistance or an open in the headlamp high beam signal circuit of the inoperative high beam headlamp. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 17
Go to Step 12

11

Inspect for poor connections at the harness connector of the inoperative headlamp. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 17
Go to Step 14

12

Inspect for poor connections at the harness connector of the fuse block - underhood. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 17
Go to Step 15

13

Inspect for poor connections at the harness connector of the headlamp dimmer switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 17
Go to Step 16

14

Replace the inoperative headlamp. Refer to Headlamp Assembly or Headlamp Bulb and/or Cornering, Sidemarker, Park, Turn Signal Bulb Replacement .
Did you complete the repair?
Go to Step 17
--

15

Replace the fuse block - underhood. Refer to Underhood Electrical Center or Junction Block Replacement in Wiring Systems.
Did you complete the repair?
Go to Step 17
--

16

Replace the headlamp dimmer switch. Refer to Turn Signal Multifunction Switch Replacement in Steering Wheel and Column.
Did you complete the repair?
Go to Step 17
--

17

Operate the system in order to verify the repair.
Did you correct the condition?
System OK
Go to Step 2

Jan 07, 2016 | Buick Cars & Trucks

1 Answer

Why don't lights work?


Both the headlight switch and the BCM provide a ground, or control circuit, to the headlight relay coil circuit for manual or automatic headlamp operation. When you place the headlamp switch in the OFF position, and the ambient light sensor indicates low light conditions, the BCM energizes the headlamp relay for low beam operation. You may switch the headlights to high beam by pulling the dimmer switch handle toward you until the dimmer switch is activated. When the dimmer switch is placed in the HIGH position, the indicator lamp input to the BCM is pulled low. The BCM then sends a class 2 message to the instrument cluster in order to illuminate the high beam indicator lamp.
Low and High Beams Headlamps Inoperative ?
Replace the headlamp switch. Refer to Headlamp Switch Replacement .
Did you check the headlamp relay ? Location ,left instrument panel
Did

Nov 11, 2015 | 2001 Chevrolet Monte Carlo

2 Answers

All of my running lights and blinkers work and high beams but no low beams on my 1997 Chevrolet TahoeA


Headlamps Inoperative - Low Beams

Step

Action

Value(s)

Yes

No

DEFINITION: This diagnostic procedure should only be used if the high beam headlamps are operating properly and the low beams are inoperative.

1

Did you perform the Headlights System Check?
--
Go to Step 2
Go to Headlight System Check

2

  1. Turn the headlamp and panel dimmer switch to the ON position.
  2. Move the headlamp dimmer switch to the LOW position.
  3. Backprobe the headlamp dimmer switch connector with a J 35616-200 from cavity A to ground.

Does the test lamp light?
--
Go to Step 3
Go to Step 5

3

  1. Remove the daytime running lamp relay.
  2. Connect a J 35616-200 at cavity G5 to ground.

Does the test lamp light?
--
Go to Step 4
Go to Step 6

4

  1. Re-install the daytime running lamp relay.
  2. Backprobe cavity B at the high/low beam headlamp with the headlamp dimmer switch in the LOW position.

Does the test lamp light?
--
Go to Step 7
Go to Step 8

5

Replace the headlamp dimmer switch.

Is the repair complete?
--
Go to Headlight System Check
--

6

Repair the open in CKT 359 (PPL) between the headlamp dimmer switch and the daytime running lamp relay.

Is the repair complete?
--
Go to Headlight System Check
--

7

Replace the high/low beam headlamps.

Is the repair complete?
--
Go to Headlight System Check
--

8

  1. Inspect for an open in CKT 12 (TAN) between the daytime running lamp relay and S120, repair as necessary.
  2. Replace the daytime running lamp relay if no open was found in CKT 12 (TAN) between the daytime running lamp relay and S120.

Is the repair complete?
--
Go to Headlight System Check
--

Jul 24, 2015 | Chevrolet Cars & Trucks

1 Answer

99 olds bravada, DRL's inop, low beams inop, high beam normal on pass side, dim on drivers.


top middle connection is the earth on the bulb and this is faulty ,what end i couldnt tell you but its no doubt the chassis side so run another cvable to teh neg on the battery and if it brightens up then you know its a earth problem

Oct 14, 2012 | Oldsmobile Cars & Trucks

1 Answer

Inop low beam fuses are good makes clicking sound when you turn them on high beams work fine


Low beam has a relay it is making the sound, turn on while looking for the noise the relay you find may be bad but make sure the the low beam bulbs are good first as they are way more likly to be bad than the relay or the fuse

Oct 12, 2009 | 2002 Honda CR-V

1 Answer

Passenger headlight don't work 2003 lincoln navagator


high beam or low beam? or both of them on one side.

  • One low beam headlamp is inoperative
  • Central junction box (CJB) fuse 23 (10A) (RH headlamp).
  • CJB fuse 25 (10A) (LH headlamp).
  • Circuitry.
  • CJB.
  • Go To Pinpoint Test C .


  • One high beam headlamp is inoperative
  • Circuitry.
  • Headlamp assembly.
  • Go To Pinpoint Test D .

  • The high and low beam headlamp is inoperative on one side
  • Circuitry.
  • REPAIR ground circuit 57 (BK).


  • Headlamp switch
  • Multifunction switch
  • Vehicle Security Module
  • Central junction box (CJB) fuse(s):
    • 17 (15A)
    • 23 (10A)
    • 25 (10A)
    • 35 (20A)
    • 40 (20A)
  • Circuitry
  • Headlamp bulbs
  • Daytime running lamp (DRL) relay



Apr 19, 2009 | 2003 Lincoln Navigator

1 Answer

1994 ford f-150 with day time running lights headlightnot working


Daytime Running Lamps
The daytime running lamp (DRL) system is designed to turn the high beam headlamps on, with a reduced light output, and without illuminating the high beam indicator lamp in the instrument panel. You have a DRL Module.
The multifunction switch is the stalk on your column.

This is 96 F150 circuit. Don't have 94.

51f651c.gif
Symptom Chart, Headlamps HEADLAMPS Condition Possible Source Action
  • Headlamps Inoperative
  • Circuitry open/shorted.
  • Damaged headlamp switch.
  • Blown fuse.
  • GO to Pinpoint Test A .
  • Headlamps On Continuously
  • Circuitry open/shorted.
  • Damaged headlamp switch.
  • GO to Pinpoint Test B .
  • High Beams or Low Beams Inoperative
  • Circuitry open/shorted.
  • Damaged multi-function switch.
  • GO to Pinpoint Test C .
  • One High Beam or One Low Beam Headlamp Inoperative
  • Circuitry open/shorted.
  • Damaged connector.
  • Headlamp bulb damaged.
  • GO to Pinpoint Test D .
  • Flash-to-Pass Inoperative
  • Blown fuse.
  • Circuitry open/shorted.
  • Damaged multi-function switch.
  • GO to Pinpoint Test E .



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Feb 25, 2009 | 1994 Ford F150 Styleside Supercab

2 Answers

Low Bean Lights Inoperative on 1997 Acura TL


If your car is running daytime running light system .. there is a DTR relay that goes defective and needs replacing ... I had the identical problem that was fixed with this replacement. The DTR relay is behind the glovebox.

Feb 04, 2009 | 1997 Acura TL Series

1 Answer

Right High Beam Inop, all other lights work properly


might want to have the TIPM vehicle configuration reset. if that doesnt do it it probably needs a TIPM. these things seem to be pretty touchy

Jan 22, 2009 | 2006 Dodge Ram 1500

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