Question about 1991 Chevrolet Beretta

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The switch for the high beam does not work...only low beams and no cruise control 1991 beretta

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The first thing that I would recommend checking is the fuse panel. If that checks out, then you are looking at replacing the switch that operates the high beam, and the cruise control.

Posted on Mar 27, 2011

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Posted on Jan 02, 2017

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Low beam headlights do not work 2010 chevy impala high beams work as do daytime running lights low beams do not work on either automatic mode or manual mode


The headlamps are controlled by the BCM - body control module , do you know what that is ? The headlamp switch is a input to the BCM ,the BCM energizes relays to turn on the headlmps , low beam relay , high beam relay , DRL relay . These relay's are PCB - printed circuit board relay's ( non - serviceable ) If found to be bad the whole under hood fuse box would need to be replaced .
Low Beam Headlamp Operation
The low beam headlamps may be turned ON in 3 different ways:
• When the headlamp switch in the HEAD position for normal operations
• When the headlamp switch is in the AUTO position, for automatic lamp control (ALC)
• When the headlamp switch is placed in the AUTO position, with the windshield wipers ON in daylight conditions, after a 6 second delay
Battery voltage is applied at all times to the coil and switch sides of the LOW BEAM PCB Relay located in the underhood fuse block. When the headlamp switch is placed in the HEAD position, ground from G202 is applied through headlamps ON switch signal circuit to the body control module (BCM), signaling the headlamps ON request. In response to this signal, the BCM applies ground through the headlamp low beam relay control circuit energizing the low beam relay. With the relay energized, battery voltage is applied through the switch side of the relay, the left and right low beam fuses, and the low beam supply voltage circuits illuminating the low beam headlamps. Ground for the left headlamp is provided at G101 and the right headlamp at G100.

Do you know what B codes are ? BCM - DTC'S - diagnostic trouble codes , need a factory scanner or professional one to view these codes , not autozone or advance etc....Having a qualified repair shop check your vehicle would be your best bet.

DTC B2575 00: Headlamp Control Circuit

Circuit/System Description
The vehicle headlamps are controlled by the body control module (BCM) based on inputs from the headlamp switch and the turn signal/multifunction switch. The headlamp switch has four positions: Off, Auto, Park, and Headlamps. The default headlamp switch position is Auto, in which the BCM uses the ambient light sensor to determine when headlamps are needed. The Off portion of the headlamp switch is a momentary switch which overrides the automatic headlamps and will turn off the vehicle headlamps. When in the Off position, the headlamp switch grounds the headlamp switch headlamps off signal circuit, prompting the BCM to turn off the headlamps. The Park position of the headlamp switch will only illuminate the vehicle parking lamps. The Headlamp position of the headlamp switch will illuminate both the parking lamps, as well has the headlamps. With the headlamp switch in the Headlamp position, the headlamp switch headlamps on signal circuit is grounded, prompting the BCM to turn on the headlamps, regardless of other factors such as ambient light.
The headlamp high beams are controlled through the flash to pass switch and the headlamp dimmer switch, both located in the turn signal/multifunction switch. The flash to pass switch is a momentary type switch, designed to illuminate the high beams as long as the switch is held. With the switch closed, the flash to pass switch signal circuit is grounded, prompting the BCM to turn on the high beam lamps. The headlamp dimmer switch allows the operator to select between full time high or low beam operation. Unlike the flash to pass switch, it is not a momentary switch. When the headlamp dimmer switch is in the high beam position, the headlamp dimmer switch high beam signal circuit is grounded. This prompts the BCM to turn on the high beam lamps.
The BCM controls the headlamps based on the inputs explained above. When a low beam request is received, the BCM grounds the headlamp low beam relay control circuit. This energizes the coil in the LOW BEAM PCB relay, causing the relay switch to close. This then applies B+ to both low beam headlamps through the LT LO BEAM and RT LO BEAM fuses, illuminating the low beam headlamps. When a high beam request is received, the BCM grounds the headlamp high beam relay control circuit. This energizes the coil in the HIGH BEAM PCB relay, causing the relay switch to close. This then applies B+ to both high beam headlamps through the LT HI BEAM and RT HI BEAM fuses, illuminating the high beam headlamps

Mar 12, 2018 | Cars & Trucks

1 Answer

No low beam headlights, but high beams work.


Which do you have
Low Beams - High Intensity Discharge (HID) OR
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. I suggest you take an have it diagnosed by an ASE certified repair shop that has a scan tool that can communicate with the BCM .
DTC B2575 00: Headlamp Control Circuit

Mar 15, 2016 | 2008 Chevrolet Avalanche

1 Answer

Light switch ( signal cruise and wiper also)


its the light switch (combination switch) needs to be replaced

Jun 18, 2012 | Cars & Trucks

1 Answer

What's involved in replacing muti functional turn singnal switch 1991 park ave head lights won;t come on at all beleive that switch is bad??


Fortunately your 1991 Buick is pre-steering wheel airbag...you will need to remove the steering wheel to gain full access to the "smart stick" Not to difficult with the correct puller...on loan from most parts stores...Hope this helps.

May 02, 2012 | 1991 Buick Park Avenue

1 Answer

Automatic headlamps work during the day, but at night only highbeams, even using manual switch.


Your blazer has a total of six bulbs (eight if you have fog lights) . Two are low beam, two are high beam and two are daytime running lights. It sounds to me like your high/low beam selector switch is faulty. This switch, as you might know also controlls many other functions, so if you are not having problems with other things like cruise, wipers or blinkers, I'd make sure first that your fuses are all good and the bulbs are good also before tearing into anything.

Dec 13, 2009 | 2002 Chevrolet Blazer

1 Answer

Can you put a non-cruise control headlamp switch in a 95 grand am that has cruise control? the high beams work, low beams don't and eveyone says it's the switch. the one's w/out cruise are about 1/2 as...


I tried this and it did not work for me. The lights just stayed on all the time. I guess the wiring is different or something.
And yes it is the switch. I have had this happen to 4 of the 7 grandams that I have owned. The switches are expensive!!

Oct 30, 2009 | 1995 Pontiac Grand Am

1 Answer

My headlights are not working, but shows my high beams are on


Low Beam Fuse may be bad.
Low Beam relay position is bad.
Stalk that controls the high/low beams/cruise/lights is bad.
Low beam filament may be bad in both headlamps.

Mar 06, 2009 | 1999 Chevrolet S-10 Pickup

1 Answer

High beam problem


Just to clarify, the high beam and low beam bulbs are the same bulb. It is a dual element bulb. If the bulbs and switch are known good, check the high beam relay.

Feb 07, 2009 | 1997 Jeep Wrangler

4 Answers

Low beam headlights do not work, but high beam headlights do


Clyde,

I've been troubleshooting this same problem on a different vehicle this week, and I can give you the steps I'd take.

1. If both sides went out at the same time, the problem is *NOT* likely to be the bulbs.

2. Check the fuses to see if both low beam lights are on the same fuse. Many cars have one fuse for low beam and another for high beam, so both lights out at the same time typically means fuse blown.

3. If the headlights are OK and the fuses are OK, then the problem is *LIKELY* the headlight switch. In my case, AutoZone has one and it can be installed easily; but in your case, that may not be as simple.

Please post your findings or comments.

Jul 16, 2008 | 1991 Nissan Pickup

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