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Home >> Lexus >> 2021 >> ES 350 Luxury >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Infotainment >> Navigation System (Except Hybrid) - Diagnostic Codes (1 Of 2) >> NAVIGATION SYSTEM (for Gasoline Model) >> DTC B1556: Extension Module Malfunction 2 [06/2018 - 09/2022] >> Description

DTC B1556: Extension Module Malfunction 2 [06/2018 - 09/2022]: Description

This DTC is stored when a malfunction occurs in the Navigation ECU.

DTC No. Detection Item DTC Detection Condition Trouble Area
B1556 Extension Module Malfunction 2 When any of the following conditions is met:
  • Internal power supply malfunction
  • Internal hard drive malfunction
  • EEPROM error
  • Storage malfunction
 Navigation ECU
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