My 07 Pontiac Grand Prix base has my dashboard, radio, door lock, and headlight turned off and on while driving, unexpected. What is causing it?
HL off driving but engine did not staled?
not told driving day or night or if day and using DRL , sun light sensor mode, if only that fails. but manual HL turned on fails highs and low beams.
gen/battery/charge lamp in cluster, glows is alternator dead. and soon to be battery discharged to the point BCM and other computers in the car die.(just go mad or offline)
on this car the body brain BCM runs 2 relays and 4 fuse to make HL work. so if battery voltage drops to far the BCM fails for lack of 10vdc power (up to 15v)
not told you if high and low beams fail and park lamps too, 4 lamps park or more)
if car had DRL option (daylight running lamps) that too is BCM operated, so it fails too.
check battery voltage running, see
13v to 15vdc is correct running,not less.
1-CHECK FUSES
2- TEST THE ALTERNATOR;
3- SCAN THE CAR. OBD2 scan port,
WARNING
SOME NEWER CARS THE NEWER SMARTER ALTERNATOR
GOES OFF LINE (BY ITS OWN ACTS) IF IT SEES A VERY BAD BATTERY THERE. (MISSING, OR 1 CELL OPEN) OR SHORTED CELLS, THERE ARE 6 CELLS TO FAIL,
THIS IS ACT IS TO END BATTERY EXPLOSION.
if alternator is dead or even intermittently, the next engine start fails ( it will not crank or too slow to start)
check all fuse
check battery voltage running 13v to 15v
load test battery (al tool) or get it tested,
charge the battery if too low.(a tool)
batteries can to fail intermittently
lose battery lugs (4 ends ,2 cables) or just rusty
and lots more, possible.
a feature of this car, alternator dies ,it auto shuts down many things.
BATTERY SAVER ACTIVE (warning displayed) all this is in your glove box guide, and free of cost to get.
This message displays when the system detects
that the battery voltage is dropping beyond a
reasonable level. The battery saver system starts
reducing certain features of the vehicle which you may be able to notice.
so... via
DIC dislplay, pick battery choice and if fails battery or alternator are bad.
(Gages): Press this button to access the
OIL LIFE REMAINING, TRANSMISSION FLUID
TEMPERATURE, BATTERY, ENGINE HOURS,
ENGINE BOOST,
users guide free here
https://www.manualslib.com/manual/629504/Pontiac-Grand-Prix-2007.html?page=1#manual
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