Question about 2003 Chevrolet TrailBlazer
Check with the dealer on A/C problem, there was a TSB a while back to fix that problem.
As far as the lghts are concerned, switch relay #45 with relay #46 next time the lights go out. You should have lights again. This relay tends to get corroded and or go out for some reason and is very common. Try cleaning the relay contacts along with the fuse box contacts first. If that doesn't work (did for me) get a new relay.
Posted on Mar 28, 2011
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Posted on Jan 02, 2017
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The ambient light sensor indicates daylight.
The vehicle is not in the PARK position.
When the above conditions are met, the lamp control module (LCM) supplies battery positive voltage (B+) to the low beam headlamps through CKT 589 (GRY), the DRL resistor, and CKT 12 (TAN). The DRL resistor reduces the voltage supplied by the LCM. The low beam headlamps light at a reduced intensity. The DRL disable if the vehicle is placed in the PARK position. When the ambient light sensor indicates darkness, the low beam headlamps automatically switch from a reduced intensity to a regular intensity.
Lamp Control Module (LCM)
In the center of the IP, below the center heater outlets
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The ability of the control modules to communicate through the serial data circuit
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