Question about 2005 Suzuki Forenza

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Low beams do not work at all times

Is there a sensor in the system? how do I trouble shoot this problem?

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My Suzuki did the same thing on a 12 hour trip. This is actually a defective wiring from the manufacturer. If you still have a warranty, the dealership will repair it usually in about an hour. Burnt connection I think is what it was.

Posted on Apr 12, 2009


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Posted on Jan 02, 2017


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2007 chev sub head lights wont turn on

Do you know anything about automotive electronics ? Electronic control modules .
Headlamp ON/OFF control is determined by the body control module (BCM) by a signal on the headlamp switch on input circuit when the headlamp switch is in the HEAD position. When the headlamp switch is in the AUTO position, the BCM determines headlamps ON/OFF by the voltage from the ambient light sensor.
If the headlight switch is left in the ON position, the inadvertent power control feature will turn OFF the headlights approximately 10 minutes after the ignition switch is turned to the OFF position. If the driver places the headlight switch in the ON position after the ignition switch has been turned OFF, or if the ignition switch is in the ACCY position, the headlights will remain ON until turned OFF or the battery runs dead.
The high beam indicator is illuminated when the instrument cluster receives a GMLAN serial data message from the BCM that the high beams are illuminated.
High Beams
The high beam headlamps receive voltage from the headlamp high relay located in the underhood fuse block. The BCM controls the relay on the headlamp high beam relay control circuit. High beam control is determined by a signal on the headlamp dimmer switch signal circuit from the multifunction switch. When the headlamp dimmer switch signal circuit is grounded, the BCM grounds the headlamp high beam relay control circuit, illuminating the high beam headlamps. The right and left high beam circuits are independent and are fused independently in the underhood fuse block.
Low Beams - Standard
The low beam headlamps receive voltage from the headlamp low beam relay located in the underhood fuse block. The BCM controls the relay on the headlamp low beam relay control circuit. Low beam control is determined by a signal on the headlamp dimmer switch signal circuit from the multifunction switch. When the headlamp dimmer switch signal circuit is open, the BCM grounds the headlamp low beam relay control circuit, illuminating the low beam headlamps. The right and left low beam circuits are independent are fused independently in the underhood fuse block.

Hooking up a factory scan tool an checking DTC'S - diagnostic trouble codes would be the very first step in trouble shooting this problem .
DTC B257A 00: Headlamp Switch Input Signal Mismatch
DTC 2575 00: Headlamp Control Circuit

Jun 30, 2017 | Cars & Trucks

1 Answer

2005 honda acc'd lx front lights low beam out but high beams are fine. fuse box under hood both h & low beams use same fuse is there a different fuse I am unaware of in the circuit that I can check?

The low beams have a different fuse then the high beams. High beams fuse's 3 & 5 both 10amp . low beams are 1 & 6 both 10 amp . plus there is a relay control module . The relay for the low beams could be bad ,or the light dimmer switch is bad . or the combination switch control unit is the culprit . You can find a wiring diagram at . Check out some basic electrical trouble shooting videos on you tube an test the circuit .That's best advice I can give , trouble shooting automotive electrical systems is no easy task . Especially for a rookie . Headlamp switches are not wired directly to the headlamps , the switch is a low voltage input to the combination switch control unit ,which then sends a signal to the relay control module for activation . All electronics

Oct 05, 2016 | 2005 Honda Accord 2.4 LX

1 Answer

97 sentra headlights

Check fuses with a test light Rob, in the power dist center under the hood, Check the lid for fuses to each headlight , high beam and low. Next check for current at the connector after you remove one of the low beam headlights.

Feb 03, 2014 | Cars & Trucks

2 Answers

My high beams work and low beams dont had lights ckecked and they are good

Firstly start at main on/off switch then main beam/dip switch failing that have a look at the lighting relays..Good-luck.....

Jan 05, 2013 | 2002 GMC Envoy XL

1 Answer

Have a problem with the headlights of a 96 honda odessey.They both don't work in low beam and only the drivers side works in high beam.what seems to be the problem?

Hello! I'm going to shoot the trouble assuming that the vehicle has Daytime Running Lights (DRL)...If the vehicle does not have DRL let me know...Guru...Saailer

Oct 06, 2011 | Cars & Trucks

2 Answers

2005 Ford Focus ZX3 SES, the blue high beam indicator in the dash comes on with low beams, and goes off with high beams. The indicator is on at the wrong time! I have tried the following: The turn signal...

It sounds like you are confused about how your headlamp system is supposed to work. The DRL does not run on the High beam circuit, it runs on the low beam circuit. The fog lamps are supposed operate with the park lamps and also with the low beams, not the high beams. From your description, I would say that your system is operating as designed and you are having trouble telling High from Low. (Don't feel bad, that is why high beam indicators were invented in the first place.)

May 08, 2011 | 2005 Ford Focus

1 Answer

2001 ranger.headlights (low beam) don't work. high

Hello Anonymous,

Combing over drawings... and proving CIRCUITRY
faults is a lot easier than pulling steering wheels and
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BBB Industries Premium Alternators Starters Power Steering Products

Proper trouble shooting can be ACCOMPLISHED without
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Reasonably sophisticated NCVT (non-contact voltage testers)
can be utilized in the process... virtually guarantying professional
results (little co-lateral damage... caused by accidental SHORTS & crosses (there ARE reasons talented TROUBLE SHOOTERS
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Hope this helps...

Carnac the Magnificent

Dec 13, 2017 | Cars & Trucks

1 Answer

Low beams won't work but high beams do.

From looking at a wiring diagram i would say the headlamp dimmer switch is bad . Testing the electrical circuit would be the way to tell for sure ! Not guessing an just replacing parts . Both hi an low beams receive B+ voltage from the same fuse's an HDLP relay . From there B+ voltage goes through the dimmer switch to ground . The daytime running lights are a separate system , different fuse an relay an lights . Do you know how read an use a wiring diagram for testing electrical circuits ? How to use a DVOM - digital volt ohm meter ? Free wiring diagrams ! Enter the vehicle info year , make , model an engine size . Under system click on lighting , then under subsystem click on headlamps . Watch these videos on electrical testing . Basic Electricity for Service Techs Ohm law Current Flow Opens Shorts
Electric Testing Techniques You Need to Know
The Trainer 32 How To Read An Automotive Block Wiring Diagram

Learning how to trouble shoot automotive electrical systems . This is how we fix automobiles

Apr 08, 2017 | 2001 Chevrolet Silverado 1500

1 Answer

Headlights, low beam works fine but no high beam,

might not be. high beam is directly connected and controlled by the switch in the steering column. that would be a great place to start trouble shooting. i have found a lot of problems from contacts over heating and melting the plstic holders on those switches.

tnx 4 using fixya,


Oct 27, 2008 | 1995 Honda Odyssey

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