fuses check first
and scan the PCm is next, for DTC errors
this HL system is DLR, and work like the users guide tells and has sun sensor. too. and we all know DLR loves to fail
car drives perfectly not told, and matters.
qod:
"What could be causing the relays to buzz and the lights to be on even with the key out of the ignition and the light switch turned to off or automatic"
well if you scan the PCM/BMC obd2 port
and it told you the BCM is failing what then.?
THE BUZZ MAY BE ONE LCM DEVICE IS SHORTED
THE BUZZ IS THE CLUE .
SCAN THE PCM.
key off the BCM must turn off head lamps NO. not fully truth
elaborating?
The head lamps work key on, key off , and running or sun sensor says dark.
key off and HL switch of sure the HL must turn off or the BCM is bad or the switch telling it OFF is bad.
Key if lamps must work on demand, if not bcm bad or cars battery is dead, /weak, I asked if engine runs and fuses all tested good, front bay and cab fuse boxes.
FSM factory service manual words now. reading to you now.
on this car the HL switch 7 pos. wire to the LCM
lighting control module
2 fuses, 2.7 and f2.31 must be good. in the CJB
the central JUNCTION BOX. (FUSE BOX LINGO)
LCM HAS 8 FUSES. WOW.
LCM RUNS HIGH BEAMS LEFT AND RIGHT,,
NOT MARRIED, TO 1 WIRE.
THE LCM DRIVES THE WIPER WASHER DIRECTLY
THE LCM DRIVE POWER TO PIN2 ON WIPER MOTOR
SO PULL THE WIPER MOTOR CONNECTOR AT MOTOR
SEE IF BUZZ STOPS
LCM IS REALLY A BCM BUT THEY CALLED IT WRONG
BUT CAR IS OLD AND THEY DID THAT.
LCM RUNS VAST THINGS ON THIS CAR.
EVAN THEFT SWITCH AND HOOD AJAR SWITCH
NOT SCANNING THE PCM PORT YOU MISS ALL THOSE FAILURES. CODES
IS THE PATS LAMP HAPPY, IMMOBILIZER?
BE A SHAME IF HOOD SWITCH BAD
AND LIGHTS FAIL, HOOD UP MEANS WORKING UNDER HOOD, DAY OR NIGHT AND WHAT THAT DOES AT NIGHT IDK. BUT
FUSES ALL GOOD TESTED SO
SCAN THE PCM./BCM PORT, OBD2, TOOLS WORKS
LCM PAGE1 OF MANY.
https://imgur.com/a/Ih5l2Jd