Question about 2001 Pontiac Grand Prix

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Daytime running light/blower motor interaction

The daytime running lights (drl) and blower motor speed selector are interacting in the following ways:
* If the blower motor is in the off position, the drl's go on but go off as soon as the blower selection is made to low, m1, m2,or m3 position. The AC or back windoe defroster are not accessible.
* If drl's are off and the blower motor is in high speed (no resistores in the circuit) the drl's and blower motor come on after ~30 seconds; AC and rear defroster work. If another blower motor selection is made, every thing goes off.

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  • dneece8 Nov 04, 2008

    Mine started out as an intermitant issue. Noticed that the headlights did not come on automaticly as before, then they would start working on their own. Noticed if I turned the blower selector to hih, the blower and headlights would come on. Now nothing works.

  • swanson_45 Mar 31, 2009

    I have a 2003 Pontiac Grand Prix. The blower motor went out on it and I replaced it and the resistor myself (I do not recommend this...). It worked fine for a short while and now when I turn on the blower the daytime lights go out.

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I have the same problem. I've heard the ignition switch harness is shorting out and replacing the ignition switch ($75-$125 part) will fix it. A few torx drivers and sockets are needed to replace it (a 4mm hex socket works for the column covers, but the bolts holding the ignition switch in are even smaller. I have it apart down to where I need a smaller torx socket to continue.)

Posted on Nov 22, 2008

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The ambient light sensor is a light sensitive transistor that varies its voltage signal to the body control module (BCM) in response to changes to the outside (ambient) light level. When the BCM receives this signal it will either turn on the daytime running lights (DRL) or the headlights. Any function or condition that turns on the headlights will cancel the daytime running lamps operation. With the headlight switch in the OFF position, the headlights will either be turned ON or OFF, after an approximate 30 second delay depending on whether daylight or low light conditions are sensed. The HTR A/C IGN fuse in the underhood junction block supplies ignition positive voltage to the daytime running lamp (DRL) relay coil circuit. The DRL relay switch contacts are connected to the low beam circuit. When the headlamp switch is placed in the OFF position, the BCM will either turn on or off the daytime running lamps, depending on whether daylight or low light conditions are sensed. The BCM energizes the DRL relay, closing the switch contacts and grounding the low beam circuit. Ground is provided at G101. The DRL illuminate the low beam headlights at a reduced intensity. The DRL will operate when the ignition switch is in the ON position, the gear selector is not in the PARK position and the parking brake is released. When these conditions have been met and the ambient light sensor indicates daytime conditions, the DRL will illuminate.
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