2001 cavalier: doesnt work daytime lights flash service light is on


Posted on Feb 6, 2014

A 2001 cavelier. the other day one of my low beam headlights quit, i replaced the balb it still doesnt work. when i pull it into gear the daytime driving lights flash a bunch of times then go off and the service light is on. i have check the wires under the hood for the headlights and dont think this is the problem. can you help. It soundsto me like you may have a bad connection to the relay socket, or maybe to


2001 cavalier: doesnt work daytime lights flash service light is on
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power at the main battery terminals. Here is the schematic for the DRL system, and the headlights. This is assuming that your car was made for the United States (domestic). What I would do is concentrate on the main headlights and the circuits that drive them (power and ground), and make sure that the High/Low beam switch is working properly. The headlamps are operated when the driver places the headlamp switch in the HEADLAMP position. The LT HDLP and RT HDLP fuse in the IP fuse block, supply battery positive voltage to both the left and right headlamps. The low beam and high beam circuits continue to the headlamp switch. Depending on the position of the dimmer switch, either the low or high beam circuit will now have a path to ground. Ground is provided at G204. The low beam and high beam circuits also provide the body control module (BCM) with both low and high beam inputs. The headlamp switch includes the dimmer and the flash-to-pass switch. Any function that turns on the headlights will cancel the daytime running lamps operation. The LT HDLP fuse in the IP fuse block supplies battery 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 turn on the daytime running lamps. The BCM energizes the DRL relay, closing the switch contacts and grounding the low beam circuit...




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