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Home >> Alfa Romeo >> 2021 >> Stelvio Ti >> Repair and Diagnosis >> Accessories & Equipment >> Entertainment Systems >> (Audio (Radio) (ETM) - Electrical Diagnostics) >> DTC Troubleshooting >> B3905-31 - USB Communication Between Etc And EMCM (Entertainment Multimedia Control Module) - No Signal >> Possible Causes

Possible Causes

Possible Causes
RADIO SOFTWARE UPDATE REQUIRED
USB PORT OR RADIO/ETM CONNECTIONS
UCI USB RADIO DATA (-) CIRCUIT
USB PORT
RADIO

Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding. Refer to  PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE  .

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