Changed taillight circuit boards checked all rear wiring no issues trying to look for wiring for the auto headlight sensor.
Park, Tail and Marker Lamps
The park, tail and marker lamps, including the license lamps, are turned on when the headlamp switch is placed in the PARK or HEADLAMP position, or anytime the headlights are requested. The PARK LPS fuse in the underhood junction block supplies battery positive voltage to the auto park lamp control relay switch contacts. The PARK LPS fuse in the underhood junction block also supplies battery positive voltage to the auto park lamp control relay coil. When the park lamps are turned on the body control module (BCM) energizes the auto park lamp control relay. Current flow is from the auto park lamp control relay to their respective park and marker lamps and to ground. Ground is provided at G101, G401, and G402. If the park lights are turned on after the ignition switch has been turned OFF, or is in the ACCY position, they will remain on until turned off or the battery runs dead.
Check relay # 19 AUTO PRK LMP CTRL Relay
PARK LPS 15A - AUTO PRK LMP CTRL Relay; Turn Signal Multifunction Switch
Bad relay or Multifunction switch .
B
Check
There is an issue, you have a dead short in the circuit, no quick fix for this. You must first get a wiring diagram of the entire circuit and then follow it until you locate the shorted wire or component.
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