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Home >> Lexus >> 2021 >> RC F Base >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Infotainment >> Navigation System - Diagnostic Codes (1 Of 2) >> Navigation System >> DTC B1556: Extension Module Malfunction 2 [11/2017 - ] >> Description

DTC B1556: Extension Module Malfunction 2 [11/2017 - ]: Description

These DTCs are 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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