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Home >> Toyota >> 2017 >> Prius Prime Advanced >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Diagnostic Codes (7 Of 7) >> SFI System >> DTC U0129-87: Lost Communication with Brake System Control Module Missing Message [09/2016 - ] >> Typical Enabling Conditions
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Typical Enabling Conditions

Monitor runs whenever the following DTCs are not stored None
Both of the following conditions are met -
Auxiliary battery Voltage 10 V or higher
Power switch On (IG)