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Home >> Toyota >> 2020 >> Prius LE AWD-e >> Repair and Diagnosis (Single Page) >> Engine Performance >> Testing & Diagnosis >> Engine Control System - Diagnostic Codes (8 Of 8) & Circuit Tests >> SFI System >> DTC U0129-87: Lost Communication with Brake System Control Module Missing Message [12/2018 - ] >> 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)
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