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Upgrade suburban LT headlights to LTZ version headlights???
The LT and LTZ have the same headlights. It's just the BCM is programed differently for the LTZ to have only the LEDs to be the only DRL while the LT uses both the low and strip. This is probably due to the LTZ having HID's and you wouldn't want them on for DRL's all day. My buddy is a tech...
