Diagnostic Procedure

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 B119F:2B (CONNECTIVITY MASTER UNIT - US) DIAGNOSTIC PROCEDURE - WITHOUT TELEMATICS COMMUNICATION SYSTEM

Step	Inspection	Results	Action
1	VERIFY IF GNSS INFORMATION CAN BE RECEIVED Switch the ignition ON (engine off) and display the navigation screen of the center display Is the current position displayed?	Yes	Verify that the repairs have been completed.
1		No	Go to the next step.
2	VERIFY GNSS INFORMATION RECEPTION CONDITION NOTE: If there is no response, move the vehicle outside (in environment where radio signal is not interrupted or obstructed) and verify the display again. Perform the [Navigation System Inspection] using the diagnostic assist function. (See DIAGNOSTIC ASSIST FUNCTION [CONNECTIVITY MASTER UNIT (US)] .) Verify the number of receptions display for [GPS+GLONASS+QZSS] on the inspection result screen. Is the number of receptions 1 or more?	Yes	Verify that the repairs have been completed.
2		No	Go to the next step.
3	INSPECT GPS ANTENNA CONNECTOR FOR MALFUNCTION Inspect the applicable connector and terminal. (Refer to the [CONNECTOR INSPECTION] in the appropriate service information) Are the connector and terminal normal?	Yes	Go to the next step.
3		No	Repair or replace the malfunctioning location and perform the repair completion verification.
4	INSPECT CONNECTIVITY MASTER UNIT (CMU) CONNECTOR FOR MALFUNCTION Inspect the applicable connector and terminal. (Refer to the [CONNECTOR INSPECTION] in the appropriate service information) Are the connector and terminal normal?	Yes	Go to the next step.
4		No	Repair or replace the malfunctioning location and perform the repair completion verification.
5	INSPECT GPS ANTENNA SIGNAL CIRCUIT FOR SHORT TO GROUND Inspect the applicable circuit for a short to ground. (Refer to the [CIRCUIT INSPECTION] in the appropriate service information) Is the circuit normal?	Yes	Go to the next step.
5		No	Repair or replace the malfunctioning location and perform the repair completion verification. (Refer to the [GLOBAL POSITIONING SYSTEM (GPS) ANTENNA FEEDER REMOVAL/INSTALLATION] in the appropriate service information)
6	DETERMINE MALFUNCTIONING LOCATION NOTE: If there is no response, move the vehicle outside (in environment where radio signal is not interrupted or obstructed) and verify the display again. Replace the GPS antenna. (Refer to the [GLOBAL POSITIONING SYSTEM (GPS) ANTENNA FEEDER REMOVAL/INSTALLATION] in the appropriate service information) Perform the [Navigation System Inspection] using the diagnostic assist function. (See DIAGNOSTIC ASSIST FUNCTION [CONNECTIVITY MASTER UNIT (US)] .) Verify the number of receptions display for [GPS+GLONASS+QZSS] on the inspection result screen. Is the number of receptions 1 or more?	Yes	Verify that the repairs have been completed.
6		No	Put back the GPS antenna that was replaced, replace the connectivity master unit (CMU), and perform the repair completion verification. (Refer to the [GLOBAL POSITIONING SYSTEM (GPS) ANTENNA FEEDER REMOVAL/INSTALLATION] in the appropriate service information) (Refer to the [CONNECTIVITY MASTER UNIT (CMU) REMOVAL/INSTALLATION] in the appropriate service information)
Repair completion verification 1	VERIFY THAT VEHICLE IS REPAIRED Install/connect the part removed/disconnected during the troubleshooting procedure. Clear the DTC recorded in the memory. (Refer to the [CLEARING DTC] in the appropriate service information) Perform the DTC inspection for the connectivity master unit (CMU). (Refer to the [DTC INSPECTION] in the appropriate service information) Is the same Pending DTC present?	Yes	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (Refer to the [CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW] in the appropriate service information) If the CAN communication is normal, perform the diagnosis from Step 1. If the malfunction recurs, replace the connectivity master unit (CMU), then go to the next step. (Refer to the [CONNECTIVITY MASTER UNIT (CMU) REMOVAL/INSTALLATION] in the appropriate service information)
Repair completion verification 1		No	Go to the next step.
Repair completion verification 2	VERIFY IF OTHER DTCs ARE DISPLAYED Perform the DTC inspection. (Refer to the [DTC INSPECTION] in the appropriate service information) Is a DTC displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting.
Repair completion verification 2		No	DTC troubleshooting completed.