Question about 2000 GMC Sierra
The day time running never come on only headlamps and they are on all the time... what do i have to fix so running lamps are on during the day...
The day time running lamps are your headlights, the parking lights also conventionally known as the running lights serve no purpose during daylight hours and as such are not necessary in the daytime, and are not illuminated by the DRL module. The DRL (Daytime Running Lights) module illuminates the headlamps in a slightly dimmer state than night time dim headlamps, but does not turn on the conventional running lights. The only way you'll get conventional running lights during the day is to turn them on manually. I just reviewed the wiring schematics for that system, and the DRL relay bypasses the dimmer switch when active and prevents high beam operation, and feeds current directly to the low beam headlights, there is no connection to the parking light circuit from the DRL module wiring.
Posted on Nov 01, 2008
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Posted on Jan 02, 2017
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Nov 01, 2016 | Cars & Trucks
The marker lamps
The tail lamps
The license lamp
The front marker lamps are grounded through the turn filament of the respective front park/turn lamp. The front marker lamps light as a result.
The automatic lamp control function turns on the park lamps and the headlamps. This action occurs when the ambient light sensor determines that the exterior lamps should be turned ON based on the amount of available light. When the BCM grounds the park lamp relay, voltage is supplied directly to the park lamps, bypassing the turn/headlamp switch assembly. When this action occurs, the following conditions exist:
The automatic lamp control relay is grounded.
The headlamps turn ON. Refer to Headlights/Daytime Running Lights (DRL) Circuit Description .
The lamps turn OFF when the BCM does not ground the park lamp relay or the automatic lamp control relay. This action is caused by the following conditions:
The available light reaches a predetermined level.
The ignition switch is turned to the OFF position
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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.
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The ability of the control modules to communicate through the serial data circuit
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The use of the Diagnostic System Check will identify the correct procedure for diagnosing the system and where the procedure is located.
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