Question about 2004 Chevrolet Chevrolet Impala

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Replacing headlamp relay 2004 impala - 2004 Chevrolet Chevrolet Impala

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Headlamp relay is located in the left instrument panel fuse box . How To Replace Car Relay DIY Automotive Maintenance

Junction Block-Left I/P
Left side of the I/P, behind an access panel.
How To Test Relays EricTheCarGuy

Posted on Dec 24, 2016

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Posted on Jan 02, 2017

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2010 impala high beams do not come on, light on dash comes on, replaced bulbs still don't work, checked all fuses, look good


High Beam Headlamp Operation
Battery voltage is applied at all times to the coil and switch sides of the HIGH BEAM PCB Relay located in the underhood fuse block. When the headlamp dimmer switch is placed in the high beam position, the headlamp dimmer switch signal circuit to the BCM is pulled low signaling the headlamp high beam request. In response to this signal, the BCM applies ground through the high beam relay control circuit energizing the high beam relay. With the high beam relay energized, battery voltage is applied through the switch side of the relay, the left and right high beam fuses, and the high beam supply voltage circuits illuminating the high beam headlamps. At the same time the BCM sends a GMLAN serial data message to the instrument panel cluster (IPC) requesting the IPC to illuminate the high beam indicator. Ground for the left headlamp is provided at G101 and the right headlamp at G100.

Nov 23, 2016 | 2010 Chevrolet Impala

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How do i access the headlamp relay switch 2004 chevy impala


The switches used in the headlight relay operate via one circuit to control the parking lights, another current for driving lights and the third operates the high beams. One or multiple switches in the set can fail due to corrosion, excess current or exposure to damp conditions, resulting in total loss of headlight function or the inability to switch between beam brightness. The operator should inspect the switches for signs of damage or wear and replace them as needed.

Read more: Chinasinoy Electron

Aug 02, 2012 | 2004 Chevrolet Impala

2 Answers

Daytime running light module location 2001 impala


The daytime running lamps in your 2001 Chevrolet Impala are controlled by the Body Control Module (BCM) Here is a description of how the system works:

The ambient light sensor is a light-sensitive transistor that varies its voltage signal to the Body Control Module (BCM) in response to changes in the outside (ambient) light level. When the BCM receives this signal, the BCM turns ON either the DRL or the headlamp relay for auto headlamp operation. Any function or condition that turns ON the headlamps will cancel the DRL operation.
Thirty seconds after you start the ignition with the headlamp switch set in the OFF position, the DRL will perform one of two actions:

Illuminate the high beam headlights at a reduced intensity in daylight conditions
Illuminate the low beam headlights in low light conditions
The DRL/EXT lamps fuse in the top of the engine fuse block supplies battery positive voltage to both the DRL switch contacts and to the DRL relay coil. When the BCM energizes the DRL relay coil, current flows through the right high beam lamp, to the left hand high beam lamp, to the energized DRL relay switch contacts, to ground G101.
The high beam headlamps are now in series, and split the voltage so that the headlamps illuminate at halt intensity. The DRL operates when the ignition switch is in the RUN position, and the parking brake is not set or the transmission is not in park. When these conditions have been met and the ambient light sensor indicates daytime conditions, the DRL will illuminate.

Oct 10, 2011 | 2001 Chevrolet Impala

1 Answer

2004 Impala- I'm looking for a simple solution to de-activating the automatic headlights at dusk feature.


under the hood in the fuse/relay box there will be a relay for the automatic headlamps, also a relay marked drl daytime runnin lamp, sometimes there one and the same.


































































































































































































































































































































































Dec 09, 2010 | 2004 Chevrolet Impala

1 Answer

Cannot get the headlights to turn off? They have a auto feature with a sensor bulb in the dash.


Hello! First, pull the headlamp relay...Do lights go out? Replace relay...Next pull the DRL relay...Do lights go out?...bothh relays are located inside the vehicle, in the left hand junction box...

Guru...Saailer

Aug 11, 2010 | 2004 Chevrolet Impala

1 Answer

My day light running lights work but not my night lights


It sounds like your low headlight relay may not be working. not sure on this particular model, but most of them have relays for high and low beam headlamps. these are usually located in the power distribution panel under the hood. before replacing make sure you have power to them. if not check for wiring problem, if power is present try a different relay.

Sep 02, 2009 | 2003 Chevrolet Impala

1 Answer

2003 Impala headlights stopped working. I checked


Ok, locate the relay panel (probably inder the hood) and find the relay that controls the headlamps. With your headlight switch "on", pull the relay and see if your getting a hot current to the connectors in the relay panel. If it's hot, replace the relay. If no current, it's probably your headlight switch.

Jun 09, 2009 | 2003 Chevrolet Impala

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