Posted this as a reply to someone having a similar issue but thought id make a new thread for visibility. 2013 LX570 that I picked up a year ago. Drivers side headlight was flickering occasionally and got worse until it gave out recently. Replaced the bulb, did not work. In my case, the fuse was blown. Thought it might have been because of the bad bulb. Replaced the bulb and the fuse and it started but flickered and died. Fuse blew again. Checked the pins on the switch under the steering wheel and it all looked fine. No noticeable damage to wiring. Also right headlight working fine. Took it to a regular shop and they told me it’s probably the balancer/ballast/igniter and to take it to the dealer without actually looking at it as they said it could be another issue.
Lexus tech said that it was not throwing any codes, he swapped the balancer to the right and it was working fine. Said it’s an issue with the headlight itself. Wants to charge $3000 to replace headlight and balancer on drivers side only. Does not make sense to me. Thinking about replacing myself if I have to as dealer wants to charge $3k, but before that I don’t understand why it could be headlight. All other fused connections for headlight (high beam, DRL, motor) are separate fused connections. Low beam path seems to be battery to switch to fuse to ballast to bulb. It has to be something in that chain and not the headlight. I don’t have the schematic but if someone does, can you advise if the headlight replacement makes sense or if I should just need to replace the ballast? PFA
Lexus tech said that it was not throwing any codes, he swapped the balancer to the right and it was working fine. Said it’s an issue with the headlight itself. Wants to charge $3000 to replace headlight and balancer on drivers side only. Does not make sense to me. Thinking about replacing myself if I have to as dealer wants to charge $3k, but before that I don’t understand why it could be headlight. All other fused connections for headlight (high beam, DRL, motor) are separate fused connections. Low beam path seems to be battery to switch to fuse to ballast to bulb. It has to be something in that chain and not the headlight. I don’t have the schematic but if someone does, can you advise if the headlight replacement makes sense or if I should just need to replace the ballast? PFA