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 B1A30:2B (CONNECTIVITY MASTER UNIT) DIAGNOSTIC PROCEDURE

Step	Inspection	Results	Action
1	VERIFY COMMANDER SWITCH CONDITION Visually inspect each switch of the commander switch. Are there any switches in the commander switch that are stuck in a pressed condition?	Yes	Release the stuck switch. If foreign matter is caught, remove it if possible. The stuck switch and adjacent switch are operated any number of times. If the stuck switch is released: Go to the next step. If the stuck switch is not released Repair or replace the malfunctioning location and perform the repair completion verification. (Refer to the [COMMANDER SWITCH REMOVAL/INSTALLATION] in the appropriate service information)
1		No	Go to the next step.
2	VERIFY COMMANDER SWITCH MALFUNCTION Switch the ignition ON (engine off). Verify the commander switch operation using the [Touch Pad/Commander Inspection] using the diagnostic assist function. (See DIAGNOSTIC ASSIST FUNCTION [CONNECTIVITY MASTER UNIT (US)] .) Is the commander switch operating normally?	Yes	Go to the next step.
2		No	Perform the symptom troubleshooting procedure [OPERATION USING COMMANDER SWITCH NOT POSSIBLE] of the connectivity master unit (CMU). (See OPERATION USING COMMANDER SWITCH NOT POSSIBLE .) If the malfunction recurs, replace the commander switch and perform the repair completion verification. (Refer to the [COMMANDER SWITCH 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.