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 U2141:00 (CONNECTIVITY MASTER UNIT) DIAGNOSTIC PROCEDURE

Step	Inspection	Results	Action
1	RELAUNCH CONNECTIVITY MASTER UNIT (CMU) AND VERIFY REPEATABILITY Switch the ignition ON (engine off or on). Perform the following operation to relaunch the connectivity master unit (CMU). Switch the ignition OFF. Remove all of the remote transmitters from the vehicle, lock all doors, and then wait for 10 min. Switch the ignition ON (engine off or on). Clear the DTC recorded in the memory. (Refer to the [CLEARING DTC] in the appropriate service information) Switch the ignition OFF, and then switch it ON (engine off or on) and wait for 30 s or more. Perform the DTC inspection for the connectivity master unit (CMU). (Refer to the [DTC INSPECTION] in the appropriate service information) Is the same DTC displayed or does the same malfunction appear?	Yes	Verify if the following DTCs are displayed at the same time. U0162:00 U0187:00 If U0162:00 is displayed Go to the next step. If U0187:00 is displayed Go to Step 7. If they are not displayed Go to Step 12.
1		No	Go to repair completion verification 2.
2	VERIFY CENTER DISPLAY POWER SUPPLY CIRCUIT (ACC) VOLTAGE Measure the voltage at the following terminals (vehicle wiring harness side). Center display terminal 1G Is the voltage B+?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC U0162:00 [CONNECTIVITY MASTER UNIT] .)
2		No	Go to the next step.
3	INSPECT CENTER DISPLAY 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	SHORT TO GROUND IN CENTER DISPLAY POWER SUPPLY CIRCUIT (ACC) 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.
4		No	Repair or replace the malfunctioning location and perform the repair completion verification.
5	SHORT TO POWER SUPPLY IN CENTER DISPLAY POWER SUPPLY CIRCUIT (ACC) Inspect the applicable circuit for a short to power supply. (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.
6	OPEN CIRCUIT IN CENTER DISPLAY POWER SUPPLY CIRCUIT (ACC) Inspect the applicable circuit for an open circuit. (Refer to the [CIRCUIT INSPECTION] in the appropriate service information) Is the circuit normal?	Yes	If U0187:00 is displayed Go to the next step. If U0187:00 is not displayed Go to Step 12.
6		No	Repair or replace the malfunctioning location and perform the repair completion verification.
7	VERIFY DVD/CD PLAYER POWER SUPPLY CIRCUIT (ACC) VOLTAGE Measure the voltage at the following terminals (vehicle wiring harness side). DVD/CD player terminal 1B Is the voltage B+?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC U0187:00 [CONNECTIVITY MASTER UNIT] .)
7		No	Go to the next step.
8	INSPECT DVD/CD PLAYER 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.
8		No	Repair or replace the malfunctioning location and perform the repair completion verification.
9	SHORT TO GROUND IN DVD/CD PLAYER POWER SUPPLY CIRCUIT (ACC) 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.
9		No	Repair or replace the malfunctioning location and perform the repair completion verification.
10	SHORT TO POWER SUPPLY IN DVD/CD PLAYER POWER SUPPLY CIRCUIT (ACC) Inspect the applicable circuit for a short to power supply. (Refer to the [CIRCUIT INSPECTION] in the appropriate service information) Is the circuit normal?	Yes	Go to the next step.
10		No	Repair or replace the malfunctioning location and perform the repair completion verification.
11	OPEN CIRCUIT IN DVD/CD PLAYER POWER SUPPLY CIRCUIT (ACC) Inspect the applicable circuit for an open circuit. (Refer to the [CIRCUIT INSPECTION] in the appropriate service information) Is the circuit normal?	Yes	Go to the next step.
11		No	Repair or replace the malfunctioning location and perform the repair completion verification.
12	INSPECT COMMANDER SWITCH 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.
12		No	Repair or replace the malfunctioning location and perform the repair completion verification.
13	VERIFY COMMANDER SWITCH POWER SUPPLY CIRCUIT (B+) VOLTAGE Measure the voltage at the following terminals (vehicle wiring harness side). Commander switch terminal A Is the voltage B+?	Yes	Go to Step 15.
13		No	Go to the next step.
14	INSPECT COMMANDER SWITCH POWER SUPPLY CIRCUIT (B+) FOR SHORT TO GROUND AND OPEN CIRCUIT Inspect power supply circuit (B+) for short to ground and an open circuit. (Refer to the [CIRCUIT INSPECTION] in the appropriate service information) Is the circuit normal?	Yes	Replace the commander switch and perform the repair completion verification. (Refer to the [COMMANDER SWITCH REMOVAL/INSTALLATION] in the appropriate service information)
14		No	Repair or replace the malfunctioning location and perform the repair completion verification.
15	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.
15		No	Repair or replace the malfunctioning location and perform the repair completion verification.
16	VERIFY COMMANDER SWITCH POWER SUPPLY CIRCUIT (ACC) VOLTAGE Measure the voltage at the following terminals (vehicle wiring harness side). Commander switch terminal D Is the voltage B+?	Yes	Go to Step 20.
16		No	Go to the next step.
17	SHORT TO GROUND IN COMMANDER SWITCH POWER SUPPLY CIRCUIT (ACC) 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.
17		No	Repair or replace the malfunctioning location and perform the repair completion verification.
18	SHORT TO POWER SUPPLY IN COMMANDER SWITCH POWER SUPPLY CIRCUIT (ACC) Inspect the applicable circuit for a short to power supply. (Refer to the [CIRCUIT INSPECTION] in the appropriate service information) Is the circuit normal?	Yes	Go to the next step.
18		No	Repair or replace the malfunctioning location and perform the repair completion verification.
19	OPEN CIRCUIT IN COMMANDER SWITCH POWER SUPPLY CIRCUIT (ACC) Inspect the applicable circuit for an open circuit. (Refer to the [CIRCUIT INSPECTION] in the appropriate service information) Is the circuit normal?	Yes	Go to the next step.
19		No	Repair or replace the malfunctioning location and perform the repair completion verification.
20	SHORT TO GROUND IN COMMANDER SWITCH SIGNAL CIRCUIT 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.
20		No	Repair or replace the malfunctioning location and perform the repair completion verification.
21	SHORT TO POWER SUPPLY IN COMMANDER SWITCH SIGNAL CIRCUIT Inspect the applicable circuit for a short to power supply. (Refer to the [CIRCUIT INSPECTION] in the appropriate service information) Is the circuit normal?	Yes	Go to the next step.
21		No	Repair or replace the malfunctioning location and perform the repair completion verification.
22	OPEN CIRCUIT IN COMMANDER SWITCH SIGNAL CIRCUIT Inspect the applicable circuit for an open circuit. (Refer to the [CIRCUIT INSPECTION] in the appropriate service information) Is the circuit normal?	Yes	Go to the next step.
22		No	Repair or replace the malfunctioning location and perform the repair completion verification.
23	INSPECT COMMANDER SWITCH FOR MALFUNCTION DEPENDING ON REPEATABILITY 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, replace the commander switch and perform the repair completion verification. (Refer to the [COMMANDER SWITCH REMOVAL/INSTALLATION] in the appropriate service information)
23		No	Go to repair completion verification 2.
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.