this a CANADA car with loves to fail DRL lamps (daylight running lamps)>>
`
hood open switch dead kills many things on some cars even starting engine dead.
my guess now is , DRL died as they l
ove to do
and you need a new DRL module see its burned up pins?
it is more simple this year, and no DRL modules to burn up as seen 1996 on many here.
clean the sunset sensor lens of all dirt.??????
more
there is a DRL relay too
and these words.
DRL operation is determined by the ambient light sensor and the controlled by the body control module (BCM)
paste more me
BCM determines the conditions are met for DRL operation, it applies ground to the DRL relay control circuit energizing the DRL Relay. With the relay energized, battery voltage is applied through the switch side of the relay, the DRL fuse, and a resistor wire spliced to the low beam supply voltage circuit illuminating the headlamps at a reduced intensity. Any function or condition that turns on the headlamps will cancel DRL operation. When the BCM detects low light conditions, it will turn OFF the daytime running lamps and turn ON the low beam headlamps as described above in Low Beam Headlamp Operation. The BCM will also turn ON the low beam headlamps in daylight conditions when the windshield wipers are turned ON.
all this and more in the service manual
there is no dRM module actual
just BCM and 1 relay here it is, seen in real book on 2006
better photo
https://imgur.com/a/sO8Z9cQ
all fuse con are works
headlamps work key off and on.
park lamps work key off too. do they
the BCM is told to go to DRL mode with the sunset solar cell devices
that hardwire BCM
your shop is using? 1996 scan-tools are useless on his GM car.?
cant see DTC P1xxxx errors up or blind to B2575? errors
all B25xx errors the tool can not see GM real modern errors/
sad that if true.
one trick after all fuses checked
and battery main ,rested, is 12.6vdc fully charges
pull the battery neg lug for 30min. or 1hour and put it back all the brains reset and can now function ok.
the transmission may do to auto-learn model , no worry there.
clean the sunset sensor. lens.
and use only modern scan tools say 2005 up or newer.
for sure those marked GM ready !!!!!!!!