Question about 2004 Chevrolet Silverado

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Signals and brake lights dim when brakes applied

When the brakes are applied the rear brake lights and signals are dim and the front signals are on dim also. The turn signals work until the brake is applied, then they either blink fast or do not work at all. The signals are dim also, the turn signal indicators glow dimly when the signal is on. What is the problem?

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It could be a bad connection in the stoplight wiring most likely the earth wire check all the wiring connectors to make sure they are plugged in properly.....hope this helps.....cheers

Posted on Jul 10, 2010

  • mike_peterso Jan 03, 2011

    i am having the same problem but only happens when the headlights are on

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Posted on Jan 02, 2017

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08 Buick lucerne cxl. Third brake light works as well as front signal lights. No rear brake lights or turn signals. Tail lights and headlights and third brake lights works. Bulbs good. Help


Stop Lamps
The brake pedal position sensor is used to sense the action of the driver application of the brake pedal. The body control module (BCM) provides a 5-volt reference voltage and low reference to the brake pedal position sensor. The position sensor provides an analog voltage signal back to the BCM that will increase as the brake pedal is applied. When the brake is applied, the BCM will then apply battery voltage to the left and right stop/turn signal lamp supply voltage circuits and the center high mounted stop lamp (CHMSL) supply voltage circuit illuminating the stop lamps. At the same time the BCM applies battery voltage through the signal circuit to the transmission control module (TCM) and the engine control module (ECM) indicating that the brakes are applied.
Ground for the stop lamps is supplied as follows:
• G402 provides ground for the left rear stop/tail/turn signal lamps
• G403 provides ground for the right rear stop/tail/turn signal lamps
• G301 provides ground for the CHMSL
The stop lamps on this vehicle will not illuminate unless the ignition is in the accessory, run, or crank positions. When the ignition is in the OFF position the stop lamps will not illuminate when the brake pedal is applied.
Battery voltage from the LT TRN/SIG and RT TRN/SIG fuses located in the rear fuse block is also used by the body control module (BCM) for stop lamp operation.

Turn Signal Lamps
Battery voltage supplied to the body control module (BCM) from the fuses listed below is used for turn signal and hazard lamp operation.
• LT TRN/SIG fuse for the left turn signals
• CTSY/RF TRN fuse for the right front turn signal
• RR TRN/SIG fuse for the right rear turn signal
When the turn signal switch is place in either the LEFT or RIGHT position, ground from G300 is applied through the turn signal switch signal circuit to the BCM indicating the turn signal request. In response to this signal, the BCM applies a pulsating voltage to the front and rear turn signal lamps supply voltage circuits cycling the lamps ON and OFF. At the same time the BCM sends a GMLAN serial data message to the instrument panel cluster (IPC) to cycle the appropriate turn signal indicator ON and OFF.
Ground for the turn signal lamps is supplied as follows:
• G104 provides ground for the left and right front turn signal lamps
• G402 provides ground for the left rear stop/tail/turn signal lamps
• G403 provides ground for the right rear stop/tail/turn signal lamps

Do you have a factory scan tool (tech2) ? Your best bet , take it to the dealer .

Sep 08, 2017 | Buick Cars & Trucks

1 Answer

Turn signals blink to fast and blink on both sides on rear


Sounds like an indication of a burnt out bulb. Check the front bulbs

Apr 09, 2016 | 2004 Chevrolet Avalanche

1 Answer

Brake lights work but are very dim


It can be loose wiring or issue with bulb or the battery is weak or brake light socket getting short somewhere.Car lights getting dim,there are many such common issues noticed.I will share some familiar help links,related to your problem.
Click the link below:---2004 Dodge Ram: High Beam Light is DIM? http://technoanswers.blogspot.in/2012/04/2004-dodge-ram-high-beam-light-is-dim.html
----------Ford Odometer Dims intermittently http://schematicsdiagram.blogspot.in/2012/07/ford-odometer-dims-intermittently.html
---------Turn Signals Don't Work When Brakes Are Applied? http://schematicsdiagram.blogspot.in/2012/04/2005-gmc-envoy-turn-signals-dont-work.html
--------
Brake light Switch Location? http://schematicsdiagram.blogspot.in/2012/04/1996-buick-regal-gran-sport-brake-light.html
----------- No brake lights on Buick? http://schematicsdiagram.blogspot.in/2012/04/no-brake-lights-on-buick.html
----------- Brake lights not working on 1989 BUICK REGAL? http://schematicsdiagram.blogspot.in/2012/04/brake-lights-not-working-on-1989-buick.html

-----------
These will help.
Thanks.

Nov 06, 2012 | 1999 Ford Contour

1 Answer

Third brake light stays on; brakelights very dim; radio, clock, flasher emblem on dash blink when turn signals are used; signals flash fast when brake pedal is applied.


Sounds like you have a short somewhere in the brake circuit. May be between the brakes and the blinkers in the brake lights.

Sep 19, 2011 | 1998 Oldsmobile Silhouette

1 Answer

Brake lights don't work when headlights are on. When brake is pressed turn signals go fast and when brake is pressed when headlights are on they are so dim you can't see them plus turn signals...


{: ) Looks like your lightings got haywired. Have you had vehicle repairs recently? Anyway, it seems that you have poor grounding connections for the affected lightings. Some circuits share common ground, and ground terminals are strategically distributed on the vehicle. If these grounds don't have good contact with the body, chassis, or engine ground, circuit functions are badly affected. Thats why these ground points should be inspected and kept clean and tight, maintain that good wire and terminal contacts.
We can start with G100 located at the Left Front of the Engine Compartment on the left front body mount. See diagram below:


wyet_helps_24.gif Check out also G401 which is located in the chassis harness, mounted to the left rear Body mount. This ground point is shared by the rear lamps like the brakes, reverse, and rear signal lamps.
If possible check also other ground points that you may visually come across while on your search. Be sure also that fuses are all inspected good.
I hope we get lucky in finding and fixing a certain lamp function, if not all. Goodluck.

Aug 10, 2011 | 2004 GMC Yukon

1 Answer

1998 honda accord, with the headlights on the tail lights are on but turn signals do not work. if head lights are off turn signals work unless i apply the brake, if i apply the brake the brake lights work...


It sounds as if you have a bad earth to either one or both of your rear light clusters. If it only happens when you indicate in one direction then that is the offending side.

Nov 20, 2010 | 1998 Honda Accord

2 Answers

Rear turn signals and brake lights out. Front signals and rear tail lights work fine.


the brake lights and the rear turn signals should be the same bulb check the bulbs to make sure they are not blown does your third brake light work if all brake light are out and the bulbs are good check the brake light switch on the brake pedal

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Problems with turn signals and tial lights


if you have the circuit board type rear lights the circuits inside will brake and cross eachother that will cause your problem

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I think you have a bad ground in the rear lights. Try a new ground wire closer to the lights.

Aug 06, 2008 | 1993 GMC Sierra K1500

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