Lexus GS 350 exterior lighting or headlamp fault: symptoms and diagnosis This Lexus GS guide is based on 5 documented technical cases, including 2 confirmed successful repair outcomes. It summarizes the captured evidence without assuming every vehicle with a similar symptom has the same cause. Documented applicability includes 2013–2015.
What Drivers or Technicians Reported
Documented complaints included: Engine intermittently starts, runs half a second and stalls; immediate second start always succeeds.; AFS warning and no headlamp movement after collision repair with aftermarket right lamp.; RF TPMS warning remained after sensor replacement and would not reset.; Battery drained overnight and vehicle would not crank.; Power steering inoperative after reverse-polarity jump-start damage; C1515/C1525 persisted after rack and ECU replacement..
Fault Codes Seen in Supporting Cases
Codes included B2411, B2425, C1515, C1525. A code is a diagnostic clue, not automatic proof that a specific part failed.
Causes Confirmed in Documented Cases
Incorrectly pinned aftermarket headlamp assembly. Alternator internal electrical fault causing parasitic draw.
What the Diagnostic Process Found
Draw stopped FAILED with communication error No ground command
Repairs That Corrected Documented Cases
Replace with OE headlamp assembly Replace alternator and battery.
Repairs or Attempts That Did Not Solve the Original Problem
Install aftermarket right headlamp and attempt initialization — unsuccessful Replace RF TPMS sensor — unsuccessful Attempt sensor reset — unsuccessful Replace power-steering rack — unsuccessful Replace EPS ECU — unsuccessful Repeat torque calibration — unsuccessful
Lexus GS Diagnosis in Hickory, NC
Mich's Foreign Cars has served Hickory and the surrounding Western North Carolina area since 1983. We specialize in European and foreign vehicles and use professional diagnostic equipment to identify the cause before recommending repairs. If your Lexus GS is showing this symptom or fault pattern, call Mich's Foreign Cars at 828-324-6012 to schedule diagnosis.