DTC B11BA-13: Steering Switch Circuit Malfunction [Connectivity Master Unit]: 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 B11BA:13 (CONNECTIVITY MASTER UNIT) DETECTION CONDITION AND POSSIBLE CAUSE
| System malfunction location |
Steering switch circuit malfunction |
| Detection condition |
- The connectivity master unit (CMU) detects an open circuit or a short to power supply in the steering switch circuit.
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| Fail-safe |
- The steering switch operation is disabled However, if a different switch presents the same condition when it is pressed as a result of the malfunction, a mis-operation will occur.
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| Possible cause |
- Clock spring connector or terminal malfunction
- Malfunction in connectivity master unit (CMU) connector or terminal
- Short to power supply, short to ground, open circuit in steering switch signal circuit (audio)
- Short to power supply, short to ground, open circuit in steering switch signal circuit (hands-free)
- Short to power supply, short to ground in steering switch ground circuit
- Short circuit between steering switch signal circuits (audio), signal circuits (hands-free), ground circuits
- Steering switch malfunction
- Clock spring malfunction
- Connectivity master unit (CMU) malfunction
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 Courtesy of MAZDA MOTORS CORP.
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