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Home >> Toyota >> 2021 >> Mirai Limited >> Repair and Diagnosis >> Electrical >> Gauges >> Meter / Gauge System - Diagnostic Codes (2 Of 3) >> Meter / Gauge System >> DTC B1507-18: Turn Signal Light Circuit Current Below Threshold [12/2023 - ] >> Description

DTC B1507-18: Turn Signal Light Circuit Current Below Threshold [12/2023 - ]: Description

When the operation signal of the turn signal switch (headlight dimmer switch assembly) is input, the combination meter assembly operates the turn signal lights on the RH and LH sides in response to switch operation. If there is an open in the front or rear turn signal light circuit, the combination meter assembly outputs B1507-18.

HINT: 

If there is an open in a front turn signal light circuit or rear turn signal light circuit, the turn signal lights on the side with the open circuit will blink faster than usual.

DTC No. Detection Item DTC Detection Condition Trouble Area DTC Output from Priority
B1507-18 Turn Signal Light Circuit Current Below Threshold Diagnosis Condition: 
  1. Auxiliary battery voltage is 10 V or more

Malfunction Status: 
  • Open in front turn signal light circuit
  • Open in side turn signal light circuit
  • Front turn signal light assembly (w/ Advanced Park)
  • Front turn signal light LED (w/o Advanced Park)
  • Front multiplex network door ECU
  • Outer mirror retractor
  • Side turn signal light assembly
  • Rear combination light cord
  • Rear turn signal light LED
Combination Meter A