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Replaced left headlamp pigtail and lamps wont come on automatic anymore. 2007 Chevy Silverado

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Check drl= daytime runing light fuse
if ok. module may be burnt out

Posted on May 23, 2011

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Posted on Jan 02, 2017

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2007 chevy equinox, running lights are not working, fusses work fine, what else would be the problem?


The problem is your not familiar with electronic's on modern automobiles . Module controlled systems . BCM - body control modules .
The park lamps consist of the park, tail, marker and license lamps. These lamps are illuminated any time the headlamp switch is in the PARK, ON position, or anytime the body control module (BCM) illuminates the headlamps. The PARK fuse in the fuse block - instrument panel (I/P) supplies voltage to both the coil and switch input side of the park lamp relay. The BCM controls the park lamp relay by grounding the park lamp control circuit energizing the relay.

PCB Relays
This vehicle is equipped with the following PCB mounted relays. High Beam, Low Beam, DRL, Fog Lamp, Park Lamp, Stop Lamp, and Horn relay. They are directly soldered to the underhood fuseblock circuit board. A failure of one of these relays will require the whole underhood fuseblock to be replaced.

Your best bet have a qualified repair shop diagnose the problem . Could have DTC'S - diagnostic trouble codes stored in the BCM For circuit faults .
Park Lamp Switch On
B257A 00
B2057A 00
B257A 00
--
When the headlamp switch is in the OFF position, the body control module (BCM) receives a ground signal through the headlamp switch OFF circuit and an open signal on the park lamp ON circuit. When the headlamp switch is in the PARK or HEAD position, the BCM receives an open signal through the headlamp switch OFF circuit and a ground signal through the park lamp ON circuit.

DTC B2585 00: Park Lamp Control Circuit - Domestic

Jan 17, 2017 | 2007 Chevrolet Equinox

1 Answer

I'm needing the wiring diagram for my 2007 Chevrolet Impala LT 3.5 tail lights.


Go to http://www.bbbind.com/free_tsb.html free wiring diagrams ! You having tail light problems ? Do you know how they work ?

They are turned on by the BCM !
Park, Tail, Marker and License Lamps
The park, tail, license, and marker lamps are turned ON when the headlamp switch is placed in either the HEAD or PARK lamp positions, or anytime the automatic light control (ALC) turns the headlamps ON. When the headlamp switch is placed in the park lamp or headlamp positions, ground from G202 is applied through the signal circuit to the BCM indicating the park lamp request. In response to this signal, the BCM applies ground through the park lamp relay control circuit energizing the PARK LP PCB Relay. With the relay energized, battery voltage is applied through the switch side of the relay, both park lamp fuses, and the supply voltage circuits illuminating the park, tail marker, and license lamps. Ground for the left front park and marker lamps is provided at G101 and the right front park and marker lamps at G100. Ground for all rear lamps is provided at G302.
Turn Signal Lamps
The LT T/SIG and RT T/SIG fuses located in the underhood fuse block supplies battery positive voltage to the body control module (BCM) for turn signal and hazard lamp operation. When the turn signal switch is place in either the LEFT or RIGHT position, ground from G202 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. The BCM also sends a message via GMLAN to the instrument panel cluster (IPC) to cycle the turn signal indicator ON and OFF depending on the position of the turn signal switch.
Ground for the turn signal lamps is supplied as follows:
?€¢
G101 provides ground for the left front turn signal lamp


?€¢
G100 provides ground for the right front turn signal lamp


?€¢
G302 provides ground for the left and right rear turn signal lamps

May 03, 2016 | 2007 Chevrolet Chevrolet Impala LT

1 Answer

Explorer 2007 Right Head Lamp And HighBeam Problem


Have you checked the bulbs? There are individual fuses for each headlamp so you'll want to check those also. they are in the battery junction box which is under the hood on the driver's side, fuse 29 is for the right headlamp and fuse 34 is for the left headlamp.

Jul 27, 2015 | 2007 Ford Explorer Eddie Bauer

1 Answer

Why does my 1999 chevy malibu headlights turn on by them self in middle of night


You have a gremlin ! No , just kidding . No it's not the ignition switch ! The headlamps right an left have there own fuse in the under hood fuse box . LH HDLP - RH HDLP . Power direct to the head lamps an they ground through the headlamp switch when placed in high or low beams . Next time they come on wiggle the headlamp switch an see if they go out ! Does your vehicle have auto lights ? Day time running lamps ? The BCM - body control module controls Automatic lamp control !
Battery voltage is applied to the headlamp bulbs at all times. The headlamps are controlled by supplying the ground for the lamps through the turn/headlamp switch assembly or the body control module (BCM). When the turn/headlamp switch is in the ON position, the ground is supplied through CKT 150.
The BCM controls the daytime running lamps (DRL). The system allows the headlamps to operate at a reduced intensity under the following conditions:
?€¢
The engine is running.


?€¢
The transaxle is not in the PARK position.


?€¢
The normal headlamps are turned OFF.

The BCM activates the system by grounding CKT 592. This action energizes the DRL relay. This condition allows a reduced voltage to flow to the headlamps. When the headlamp switch is turned to ON, the headlamps operate normally.
The parking brake provides an input to the BCM. When the parking brake is engaged, the DRL remain disabled until the parking brake is disengaged.

May 30, 2015 | 1999 Chevrolet Malibu

2 Answers

Are the head lights on all the time 1999 chevy silverado 1500 4x4


On a 99 chevy silverado if equipped with auto headlamps there is a sensor on the dash near the front center of dash a small black bubble. If it is covered it will cause the lights to stay on. The day time running lights are typically seperate from the head lamps

Jul 13, 2014 | 1999 Chevrolet Silverado 1500

1 Answer

I have a 2007 silverado. I don't want to change a bulb, I want to paint a fender. How do I get the headlamp assembly out?


Raise your hood. There should be two long screws on top the radiator support. Pull out both screws then pull the head lamp assembly toward you.

Oct 21, 2010 | 2007 Chevrolet Silverado 1500 2WD

1 Answer

How do I adjust the low beam height on a 2007 jeep grand cherokee/


1. Turn the headlamps ON and select the LOW beams for vehicles in all markets except Japan. Vehicles for the Japanese market should have the headlamp HIGH beams selected.
2. Insert a screwdriver through the outboard clearance hole (1) in the front lamp unit cover (2) to rotate the headlamp vertical adjustment screw on each front lamp (3) to adjust the beam height as required.
3. For export markets only, insert a screwdriver through the inboard clearance hole in the front lamp unit cover to rotate the headlamp horizontal adjustment screw on each front lamp to adjust the beam right or left as required.
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Oct 17, 2010 | 2007 Jeep Grand Cherokee Overland

1 Answer

How can I change the front signal lamp on the Chevy uplands 2007?


The headlamp assembly must be removed. There is a pin and small bolt that need to be removed then the head lamp can be pulled out. This will give you access to reach down and twist the signal lamp socket loose.

Jul 25, 2010 | 2007 Chevrolet Uplander

1 Answer

Headlamps not working, fuses o.k., bulbs ok, replaced switch ok 98 chevy cavalier w/ daytime running lights . 2 relays on harness between headlamps one is for fog lamps, not sure of the other , cannot get...


are your daytime running lamps working. if they are according to the schematic there are 4 relays, fog lamp, fog lamp cut off, isolation, and daytime running lamp; 2 fuses: right and left, that supply volts to the headlamps. it's a little confusing though, because these schematics might have some mistakes. anyway, it looks like the drl relay.grounds the headlamps when the drl control in the micro processor located in the instrument cluster senses the headlamps have been turned on. this trips the relay and 12vdc is supplied. the dlr might be bad. otherwise, i would think you have a hardwire or connector problem.

Mar 08, 2010 | 1998 Chevrolet Cavalier

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