Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2024 Mazda 3 Preferred, 4D HatchbackFACTORY OEM SERVICE PROCEDURE
Connectivity Master Unit
CONNECTIVITY MASTER UNIT TROUBLE CODE (DTC) IDENTIFICATION
| DTC | Description |
|---|---|
| B108E-49 | CENTER DISPLAY INTERNAL MALFUNCTION |
| B108E-96 | CENTER DISPLAY INTERNAL MALFUNCTION |
| B119F-13 | GPS ANTENNA SIGNAL CIRCUIT MALFUNCTION |
| B119F-2B | GPS ANTENNA SIGNAL CIRCUIT MALFUNCTION |
| B119F-49 | COMMUNICATION ERROR WITH GNSS |
| B11BA-13 | STEERING SWITCH CIRCUIT MALFUNCTION |
| B11BA-2B | STEERING SWITCH IS STUCK ON |
| B1238-49 | AUDIO AMPLIFIER INTERNAL MALFUNCTION |
| B1238-96 | AUDIO AMPLIFIER INTERNAL MALFUNCTION |
| B1A01-11 | COWL SIDE WOOFER (LH) AUDIO OUTPUT CIRCUIT MALFUNCTION |
| B1A01-12 | COWL SIDE WOOFER (LH) AUDIO OUTPUT CIRCUIT MALFUNCTION |
| B1A01-13 | COWL SIDE WOOFER (LH) AUDIO OUTPUT CIRCUIT MALFUNCTION |
| B1A01-2B | COWL SIDE WOOFER (LH) AUDIO OUTPUT CIRCUIT MALFUNCTION |
| B1A02-11 | FRONT DOOR SPEAKER (LH) AUDIO OUTPUT CIRCUIT MALFUNCTION |
| B1A02-12 | FRONT DOOR SPEAKER (LH) AUDIO OUTPUT CIRCUIT MALFUNCTION |
| B1A02-13 | FRONT DOOR SPEAKER (LH) AUDIO OUTPUT CIRCUIT MALFUNCTION |
| B1A02-2B | FRONT DOOR SPEAKER (LH) AUDIO OUTPUT CIRCUIT MALFUNCTION |
| B1A03-11 | TWEETER (LH) AUDIO OUTPUT CIRCUIT MALFUNCTION |
| B1A03-12 | TWEETER (LH) AUDIO OUTPUT CIRCUIT MALFUNCTION |
| B1A03-13 | TWEETER (LH) AUDIO OUTPUT CIRCUIT MALFUNCTION |
| B1A03-2B | TWEETER (LH) AUDIO OUTPUT CIRCUIT MALFUNCTION |
| B1A04-11 | COWL SIDE WOOFER (RH) AUDIO OUTPUT CIRCUIT MALFUNCTION |
| B1A04-12 | COWL SIDE WOOFER (RH) AUDIO OUTPUT CIRCUIT MALFUNCTION |
| B1A04-13 | COWL SIDE WOOFER (RH) AUDIO OUTPUT CIRCUIT MALFUNCTION |
| B1A04-2B | COWL SIDE WOOFER (RH) AUDIO OUTPUT CIRCUIT MALFUNCTION |
| B1A05-11 | FRONT DOOR SPEAKER (RH) AUDIO OUTPUT CIRCUIT MALFUNCTION |
| B1A05-12 | FRONT DOOR SPEAKER (RH) AUDIO OUTPUT CIRCUIT MALFUNCTION |
| B1A05-13 | FRONT DOOR SPEAKER (RH) AUDIO OUTPUT CIRCUIT MALFUNCTION |
| B1A05-2B | FRONT DOOR SPEAKER (RH) AUDIO OUTPUT CIRCUIT MALFUNCTION |
| B1A06-11 | TWEETER (RH) AUDIO OUTPUT CIRCUIT MALFUNCTION |
| B1A06-12 | TWEETER (RH) AUDIO OUTPUT CIRCUIT MALFUNCTION |
| B1A06-13 | TWEETER (RH) AUDIO OUTPUT CIRCUIT MALFUNCTION |
| B1A06-2B | TWEETER (RH) AUDIO OUTPUT CIRCUIT MALFUNCTION |
| B1A07-11 | REAR DOOR SPEAKER (RH) AUDIO OUTPUT CIRCUIT MALFUNCTION |
| B1A07-12 | REAR DOOR SPEAKER (RH) AUDIO OUTPUT CIRCUIT MALFUNCTION |
| B1A07-13 | REAR DOOR SPEAKER (RH) AUDIO OUTPUT CIRCUIT MALFUNCTION |
| B1A07-2B | REAR DOOR SPEAKER (RH) AUDIO OUTPUT CIRCUIT MALFUNCTION |
| B1A08-11 | REAR DOOR SPEAKER (LH) AUDIO OUTPUT CIRCUIT MALFUNCTION |
| B1A08-12 | REAR DOOR SPEAKER (LH) AUDIO OUTPUT CIRCUIT MALFUNCTION |
| B1A08-13 | REAR DOOR SPEAKER (LH) AUDIO OUTPUT CIRCUIT MALFUNCTION |
| B1A08-2B | REAR DOOR SPEAKER (LH) AUDIO OUTPUT CIRCUIT MALFUNCTION |
| B1A09-11 | FRONT DOOR SPEAKER (LH) AUDIO OUTPUT CIRCUIT MALFUNCTION |
| B1A09-12 | FRONT DOOR SPEAKER (LH) AUDIO OUTPUT CIRCUIT MALFUNCTION |
| B1A09-13 | FRONT DOOR SPEAKER (LH) AUDIO OUTPUT CIRCUIT MALFUNCTION |
| B1A09-2B | FRONT DOOR SPEAKER (LH) AUDIO OUTPUT CIRCUIT MALFUNCTION |
| B1A10-11 | FRONT DOOR SPEAKER (RH) AUDIO OUTPUT CIRCUIT MALFUNCTION |
| B1A10-12 | FRONT DOOR SPEAKER (RH) AUDIO OUTPUT CIRCUIT MALFUNCTION |
| B1A10-13 | FRONT DOOR SPEAKER (RH) AUDIO OUTPUT CIRCUIT MALFUNCTION |
| B1A10-2B | FRONT DOOR SPEAKER (RH) AUDIO OUTPUT CIRCUIT MALFUNCTION |
| B1A11-11 | REAR DOOR SPEAKER (LH) AUDIO OUTPUT CIRCUIT MALFUNCTION |
| B1A11-12 | REAR DOOR SPEAKER (LH) AUDIO OUTPUT CIRCUIT MALFUNCTION |
| B1A11-13 | REAR DOOR SPEAKER (LH) AUDIO OUTPUT CIRCUIT MALFUNCTION |
| B1A11-2B | REAR DOOR SPEAKER (LH) AUDIO OUTPUT CIRCUIT MALFUNCTION |
| B1A12-11 | REAR DOOR SPEAKER (RH) AUDIO OUTPUT CIRCUIT MALFUNCTION |
| B1A12-12 | REAR DOOR SPEAKER (RH) AUDIO OUTPUT CIRCUIT MALFUNCTION |
| B1A12-13 | REAR DOOR SPEAKER (RH) AUDIO OUTPUT CIRCUIT MALFUNCTION |
| B1A12-2B | REAR DOOR SPEAKER (RH) AUDIO OUTPUT CIRCUIT MALFUNCTION |
| B1A20-13 | ANTENNA AMPLIFIER SIGNAL CIRCUIT MALFUNCTION |
| B1A20-2B | ANTENNA AMPLIFIER SIGNAL CIRCUIT MALFUNCTION |
| B1A21-13 | FM ANTENNA AMPLIFIER SIGNAL CIRCUIT MALFUNCTION |
| B1A21-2B | FM ANTENNA AMPLIFIER SIGNAL CIRCUIT MALFUNCTION |
| B1A22-13 | DAB ANTENNA AMPLIFIER SIGNAL CIRCUIT MALFUNCTION |
| B1A22-2B | DAB ANTENNA AMPLIFIER SIGNAL CIRCUIT MALFUNCTION |
| B1A30-2B | COMMANDER SWITCH IS STUCK ON |
| B1A30-49 | COMMANDER SWITCH INTERNAL MALFUNCTION |
| B1A32-11 | MICROPHONE SIGNAL CIRCUIT MALFUNCTION |
| B1A32-12 | MICROPHONE SIGNAL CIRCUIT MALFUNCTION |
| B1A32-13 | MICROPHONE SIGNAL CIRCUIT MALFUNCTION |
| B1A32-2B | MICROPHONE SIGNAL CIRCUIT MALFUNCTION |
| B1A32-49 | MICROPHONE INTERNAL MALFUNCTION |
| B1A32-96 | MICROPHONE INTERNAL MALFUNCTION |
| B1A33-49 | REMOTE TUNER (RT) INTERNAL MALFUNCTION |
| B1A33-96 | REMOTE TUNER (RT) INTERNAL MALFUNCTION |
| B1A38-04 | USB PORT/SD CARD SLOT HUB MALFUNCTION |
| B1A89-13 | SIRIUSXM SATELLITE RADIO ANTENNA AMPLIFIER SIGNAL CIRCUIT MALFUNCTION |
| B1A89-2B | SIRIUSXM SATELLITE RADIO ANTENNA AMPLIFIER SIGNAL CIRCUIT MALFUNCTION |
| B1A89-49 | SIRIUSXM SATELLITE RADIO ANTENNA AMPLIFIER MALFUNCTION |
| B1D19-49 | DVD/CD PLAYER INTERNAL MALFUNCTION |
| U0079-00 | UNIT COMMUNICATION ERROR (HS-CAN) |
| U0101-00 | COMMUNICATION ERROR WITH TCM E-SKYACTIV EV/E-SKYACTIV R-EV |
| U0131-00 | COMMUNICATION ERROR WITH ELECTRIC POWER STEERING (EPS) CONTROL MODULE |
| U0140-00 | COMMUNICATION ERROR WITH BODY CONTROL MODULE (BCM) |
| U0151-00 | COMMUNICATION ERROR WITH SOPHISTICATED AIRBAG SENSOR (SAS) CONTROL MODULE |
| U0155-00 | COMMUNICATION ERROR WITH INSTRUMENT CLUSTER |
| U0162-00 | COMMUNICATION ERROR WITH CENTER DISPLAY |
| U0186-00 | COMMUNICATION ERROR WITH AUDIO AMPLIFIER |
| U0186-02 | COMMUNICATION ERROR WITH AUDIO AMPLIFIER |
| U0186-08 | COMMUNICATION ERROR WITH AUDIO AMPLIFIER |
| U0187-00 | COMMUNICATION ERROR WITH DVD/CD PLAYER |
| U0187-02 | COMMUNICATION ERROR WITH DVD/CD PLAYER |
| U0198-00 | COMMUNICATION ERROR WITH TELEMATICS COMMUNICATION UNIT |
| U0198-02 | COMMUNICATION ERROR WITH TELEMATICS COMMUNICATION UNIT |
| U0264-00 | COMMUNICATION ERROR WITH REAR MOUNT CAMERA |
| U2121-00 | COMMUNICATION ERROR WITH VEHICLE CONTROL MODULE (VCM) |
| U213C-00 | COMMUNICATION ERROR WITH ELECTRONICALLY CONTROLLED BRAKE UNIT |
| U213E-00 | COMMUNICATION ERROR WITH PCM |
| U2140-02 | COMMUNICATION ERROR WITH USB PORT/SD CARD SLOT HUB |
| U2141-00 | COMMUNICATION ERROR WITH COMMANDER SWITCH |
| U2142-00 | COMMUNICATION ERROR WITH MICROPHONE |
| U2145-02 | COMMUNICATION ERROR WITH REMOTE TUNER (RT) |
| U2145-08 | COMMUNICATION ERROR WITH REMOTE TUNER (RT) |
| U2300-54 | CONFIGURATION DATA OF BODY CONTROL MODULE (BCM) NOT RECEIVED |
| U2300-55 | BODY CONTROL MODULE (BCM) CONFIGURATION NOT PERFORMED |
| U2300-56 | CONFIGURATION DATA OF BODY CONTROL MODULE (BCM) IS INVALID |
| U2300-64 | CONFIGURATION DATA OF BODY CONTROL MODULE (BCM) NOT MATCHED |
| U2301-56 | CONFIGURATION DATA OF BODY CONTROL MODULE (BCM) NOT MATCHED |
| U2301-64 | CONFIGURATION DATA OF BODY CONTROL MODULE (BCM) NOT MATCHED |
| U3000-42 | CONNECTIVITY MASTER UNIT (CMU) INTERNAL MALFUNCTION |
| U3000-47 | CONNECTIVITY MASTER UNIT (CMU) INTERNAL MALFUNCTION |
| U3000-49 | CONNECTIVITY MASTER UNIT (CMU) INTERNAL MALFUNCTION |
| U3003-16 | CONNECTIVITY MASTER UNIT (CMU) LOW POWER SUPPLY VOLTAGE INPUT |
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.