DTC B1A21-2B: Fm Antenna Amplifier Signal Circuit Malfunction [Connectivity Master Unit]: 4SD: Outline
WARNING: This page is about a different car, the 2020 Mazda CX-30. However, it is still accessible from the selected car via links, so may be relevant.
DTC B1A21:2B (CONNECTIVITY MASTER UNIT) DETECTION CONDITION AND POSSIBLE CAUSE (4SD)
| System malfunction location |
FM antenna amplifier signal circuit malfunction |
| Detection condition |
- The remote tuner (RT) detects a short to power supply or short to ground in the FM antenna amplifier signal circuit, or a short circuit between FM antenna amplifier signal circuit and shield wire for 2 s.
|
| Fail-safe |
Not applicable |
| Possible cause |
- Remote tuner (RT) connector or terminal malfunction
- FM antenna amplifier feeder malfunction
- Short to ground in FM antenna amplifier signal circuit
- Short to power supply in FM antenna amplifier signal circuit
- Short circuit between FM antenna amplifier signal circuit and shield wire
- FM antenna amplifier malfunction
- Remote tuner (RT) malfunction
|
 Courtesy of MAZDA MOTORS CORP.
|