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Home >> Mazda >> 2024 >> 3 Carbon Turbo, 4D Hatchback >> Repair and Diagnosis >> Accessories & Equipment >> Infotainment >> On-Board Diagnostic - Connectivity Master Unit (2 Of 3) >> DTC B1A20-2B: Antenna Amplifier Signal Circuit Malfunction >> 5HB/WGN (U.S.A. and Canada) >> Outline

5HB/WGN (U.S.A. and Canada): Outline

DTC B1A20-2B: (CONNECTIVITY MASTER UNIT) DETECTION CONDITION AND POSSIBLE CAUSE - 5HB/WGN (U.S.A. AND CANADA)

System malfunction location Antenna amplifier signal circuit malfunction
Detection condition
  • The remote tuner (RT) detects a short to ground in the antenna amplifier signal circuit, a short to the power supply, or a short circuit between antenna amplifier signal circuit and mutual shield for 2 s.
Fail-safe Not applicable
Possible cause
  • Antenna amplifier connector or terminal malfunction
  • Remote tuner (RT) connector or terminal malfunction
  • Antenna amplifier feeder malfunction
    • Short to ground in antenna amplifier signal circuit
    • Short to power supply in antenna amplifier signal circuit
    • Short to antenna amplifier signal circuit and mutual shield
  • Antenna amplifier malfunction
    • Antenna amplifier malfunction
  • Remote tuner (RT) malfunction
G16782781Courtesy of MAZDA MOTORS CORP.