DTC U2142:00 [CONNECTIVITY MASTER UNIT (E)]

id1602a10084a4

Without Emergency Call Unit

Outline

System malfunction location	Communication error with microphone
Detection condition	•  The connectivity master unit (CMU) detects a response error from the microphone, and even though retries and relaunches are performed continuously for approx. 60 s, the malfunction condition continues.
Fail-safe	If there is a malfunction in control circuit: •  If it does not return to normal even though the power supply for the microphone is turned on/off repeatedly for the specified number of times, it is determined that the microphone is undetected, and the operation continues. •  If a communication error is detected and when it does not return to normal even though the power supply for the microphone is turned on/off repeatedly for the specified number of times, it is determined that the microphone is undetected, and the operation continues. •  The microphone setting value is periodically verified and if there is a malfunction, a setting value that protects the connectivity master unit (CMU) is set. If there is a malfunction in power supply circuit: •  If it does not return to normal even though the power supply for the microphone is turned on/off repeatedly for the specified number of times, it is determined that the microphone is undetected, and the operation continues. •  The microphone setting value is periodically verified and if there is a malfunction, a setting value that protects the connectivity master unit (CMU) is set.
Possible cause	•  Microphone connector or terminal malfunction •  Connectivity master unit (CMU) connector or terminal malfunction •  Short to power supply, short to ground or open circuit in microphone power supply circuit •  Open circuit in microphone ground circuit •  Short to power supply, short to ground or open circuit in microphone control circuit •  Microphone malfunction •  Connectivity master unit (CMU) malfunction

Diagnostic procedure

Step	Inspection	Results	Action
1	VERIFY REPEATABILITY •  Switch the ignition ON (engine off or on). •  Clear the DTC recorded in the memory. (Refer to the [CLEARING DTC] in the workshop manual) •  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 workshop manual) •  Is the same Pending DTC present?	Yes	Go to the next step.
		No	Go to repair completion verification 2.
2	VERIFY VOLTAGE SUPPLIED TO MICROPHONE •  Measure the voltage at microphone terminal B (vehicle wiring harness side). •  Is the voltage approx. 5.5 V?	Yes	Go to Step 9.
		No	Go to the next step.
3	VERIFY VOLTAGE WHICH CONNECTIVITY MASTER UNIT (CMU) IS SUPPLYING •  Measure the voltage at connectivity master unit (CMU) terminal 1F. •  Is the voltage approx. 5.5 V?	Yes	Go to the next step.
		No	Replace the connectivity master unit (CMU) and perform the repair completion verification. (Refer to the [CONNECTIVITY MASTER UNIT (CMU) REMOVAL/INSTALLATION] in the workshop manual)
4	INSPECT MICROPHONE CONNECTOR FOR MALFUNCTION •  Inspect the applicable connector and terminal. (Refer to the [CONNECTOR INSPECTION] in the workshop manual) •  Are the connector and terminal normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification.
5	INSPECT CONNECTIVITY MASTER UNIT (CMU) CONNECTOR FOR MALFUNCTION •  Inspect the applicable connector and terminal. (Refer to the [CONNECTOR INSPECTION] in the workshop manual) •  Are the connector and terminal normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification.
6	INSPECT MICROPHONE POWER SUPPLY CIRCUIT FOR SHORT TO GROUND •  Inspect the applicable circuit for a short to ground. (Refer to the [CIRCUIT INSPECTION] in the workshop manual) •  Is the circuit normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification.
7	INSPECT MICROPHONE POWER SUPPLY CIRCUIT FOR SHORT TO POWER SUPPLY •  Inspect the applicable circuit for a short to power supply. (Refer to the [CIRCUIT INSPECTION] in the workshop manual) •  Is the circuit normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification.
8	INSPECT MICROPHONE POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT •  Inspect the applicable circuit for an open circuit. (Refer to the [CIRCUIT INSPECTION] in the workshop manual) •  Is the circuit normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification.
9	INSPECT MICROPHONE CONNECTOR FOR MALFUNCTION •  Inspect the applicable connector and terminal. (Refer to the [CONNECTOR INSPECTION] in the workshop manual) •  Are the connector and terminal normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification.
10	INSPECT CONNECTIVITY MASTER UNIT (CMU) CONNECTOR FOR MALFUNCTION •  Inspect the applicable connector and terminal. (Refer to the [CONNECTOR INSPECTION] in the workshop manual) •  Are the connector and terminal normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification.
11	INSPECT MICROPHONE GROUND CIRCUIT FOR OPEN CIRCUIT •  Inspect the applicable circuit for an open circuit. (Refer to the [CIRCUIT INSPECTION] in the workshop manual) •  Is the circuit normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification.
12	VERIFY VOLTAGE SUPPLIED FROM MICROPHONE CONTROL CIRCUIT •  Measure the voltage at microphone terminal F (vehicle wiring harness side). •  Is the voltage approx. 5.43 V?	Yes	Replace the microphone and perform the repair completion verification (Refer to the [MICROPHONE REMOVAL/INSTALLATION] in the workshop manual)
		No	Go to the next step.
13	VERIFY VOLTAGE SUPPLIED AT CONTROL CIRCUIT CONTROLLED BY CONNECTIVITY MASTER UNIT (CMU) •  Measure the voltage at connectivity master unit (CMU) terminal 1G. •  Is the voltage approx. 5.43 V?	Yes	Go to the next step.
		No	Replace the connectivity master unit (CMU) and perform the repair completion verification. (Refer to the [CONNECTIVITY MASTER UNIT (CMU) REMOVAL/INSTALLATION] in the workshop manual)
14	INSPECT MICROPHONE CONTROL CIRCUIT FOR SHORT TO GROUND •  Inspect the applicable circuit for a short to ground. (Refer to the [CIRCUIT INSPECTION] in the workshop manual) •  Is the circuit normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification.
15	INSPECT MICROPHONE CONTROL CIRCUIT FOR SHORT TO POWER SUPPLY •  Inspect the applicable circuit for a short to power supply. (Refer to the [CIRCUIT INSPECTION] in the workshop manual) •  Is the circuit normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification.
16	INSPECT MICROPHONE CONTROL CIRCUIT FOR OPEN CIRCUIT •  Inspect the applicable circuit for an open circuit. (Refer to the [CIRCUIT INSPECTION] in the workshop manual) •  Is the circuit normal?	Yes	Replace the microphone and perform the repair completion verification (Refer to the [MICROPHONE REMOVAL/INSTALLATION] in the workshop manual)
		No	Repair or replace the malfunctioning location and perform the repair completion verification.
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 workshop manual) •  Perform the DTC inspection for the connectivity master unit (CMU). (Refer to the [DTC INSPECTION] in the workshop manual) •  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 workshop manual) 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 workshop manual)
		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 workshop manual) •  Are other DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting.
		No	DTC troubleshooting completed.

With Emergency Call Unit

Outline

System malfunction location	Communication error with microphone
Detection condition	•  The connectivity master unit (CMU) detects a response error from the microphone, and even though retries and relaunches are performed continuously for approx. 60 s, the malfunction condition continues.
Fail-safe	If there is a malfunction in control circuit: •  If it does not return to normal even though the power supply for the microphone is turned on/off repeatedly for the specified number of times, it is determined that the microphone is undetected, and the operation continues. •  If a communication error is detected and when it does not return to normal even though the power supply for the microphone is turned on/off repeatedly for the specified number of times, it is determined that the microphone is undetected, and the operation continues. •  The microphone setting value is periodically verified and if there is a malfunction, a setting value that protects the connectivity master unit (CMU) is set. If there is a malfunction in microphone power supply circuit: •  If it does not return to normal even though the power supply for the microphone is turned on/off repeatedly for the specified number of times, it is determined that the microphone is undetected, and the operation continues. •  The microphone setting value is periodically verified and if there is a malfunction, a setting value that protects the connectivity master unit (CMU) is set.
Possible cause	•  Microphone connector or terminal malfunction •  Emergency call unit connector or terminal malfunction •  Short to power supply, short to ground or open circuit in microphone power supply circuit •  Open circuit in microphone ground circuit •  Short to power supply, short to ground or open circuit in microphone control circuit •  Connectivity master unit (CMU) connector or terminal malfunction •  Short to power supply, short to ground or open circuit in emergency call unit control circuit •  Microphone malfunction •  Emergency call unit malfunction •  Connectivity master unit (CMU) malfunction

Diagnostic Procedure

Step	Inspection	Results	Action
1	VERIFY REPEATABILITY •  Switch the ignition ON (engine off or on). •  Clear the DTC recorded in the memory. (Refer to the [CLEARING DTC] in the workshop manual) •  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 workshop manual) •  Is the same Pending DTC present?	Yes	Perform the DTC inspection for the emergency call unit. (Refer to the [DTC INSPECTION] in the workshop manual) If DTC is displayed •  Repair the malfunctioning location according to the applicable DTC troubleshooting. (Refer to the [DTC TABLE [EMERGENCY CALL UNIT]] in the workshop manual) If DTC is not displayed •  Go to the next step.
		No	Go to repair completion verification 2.
2	VERIFY VOLTAGE SUPPLIED TO MICROPHONE •  Measure the voltage at microphone terminal B (vehicle wiring harness side). •  Is the voltage approx. 8.0 V?	Yes	Go to Step 9.
		No	Go to the next step.
3	VERIFY VOLTAGE WHICH EMERGENCY CALL UNIT IS SUPPLYING •  Measure the voltage at emergency call unit 1E. •  Is the voltage approx. 8.0 V?	Yes	Go to the next step.
		No	Replace the emergency call unit and perform the repair completion verification. (Refer to the [EMERGENCY CALL UNIT REMOVAL/INSTALLATION] in the workshop manual)
4	INSPECT MICROPHONE CONNECTOR FOR MALFUNCTION •  Inspect the applicable connector and terminal. (Refer to the [CONNECTOR INSPECTION] in the workshop manual) •  Are the connector and terminal normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification.
5	INSPECT EMERGENCY CALL UNIT CONNECTOR FOR MALFUNCTION •  Inspect the applicable connector and terminal. (Refer to the [CONNECTOR INSPECTION] in the workshop manual) •  Are the connector and terminal normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification.
6	INSPECT MICROPHONE POWER SUPPLY CIRCUIT FOR SHORT TO GROUND •  Inspect the applicable circuit for a short to ground. (Refer to the [CIRCUIT INSPECTION] in the workshop manual) •  Is the circuit normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification.
7	INSPECT MICROPHONE POWER SUPPLY CIRCUIT FOR SHORT TO POWER SUPPLY •  Inspect the applicable circuit for a short to power supply. (Refer to the [CIRCUIT INSPECTION] in the workshop manual) •  Is the circuit normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification.
8	INSPECT MICROPHONE POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT •  Inspect the applicable circuit for an open circuit. (Refer to the [CIRCUIT INSPECTION] in the workshop manual) •  Is the circuit normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification.
9	INSPECT MICROPHONE CONNECTOR FOR MALFUNCTION •  Inspect the applicable connector and terminal. (Refer to the [CONNECTOR INSPECTION] in the workshop manual) •  Are the connector and terminal normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification.
10	INSPECT EMERGENCY CALL UNIT CONNECTOR FOR MALFUNCTION •  Inspect the applicable connector and terminal. (Refer to the [CONNECTOR INSPECTION] in the workshop manual) •  Are the connector and terminal normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification.
11	INSPECT MICROPHONE GROUND CIRCUIT FOR OPEN CIRCUIT •  Inspect the applicable circuit for an open circuit. (Refer to the [CIRCUIT INSPECTION] in the workshop manual) •  Is the circuit normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification.
12	VERIFY VOLTAGE SUPPLIED FROM MICROPHONE CONTROL CIRCUIT •  Measure the voltage at microphone terminal D (vehicle wiring harness side). •  Is the voltage approx. 8.0 V?	Yes	Replace the microphone and perform the repair completion verification (Refer to the [MICROPHONE REMOVAL/INSTALLATION] in the workshop manual)
		No	Go to the next step.
13	VERIFY VOLTAGE SUPPLIED AT CONTROL CIRCUIT CONTROLLED BY EMERGENCY CALL UNIT •  Measure the voltage at emergency call unit terminal 1Y. •  Is the voltage approx. 8.0 V?	Yes	Go to the next step.
		No	Replace the emergency call unit and perform the repair completion verification. (Refer to the [EMERGENCY CALL UNIT REMOVAL/INSTALLATION] in the workshop manual)
14	INSPECT MICROPHONE CONTROL CIRCUIT FOR SHORT TO GROUND •  Inspect the applicable circuit for a short to ground. (Refer to the [CIRCUIT INSPECTION] in the workshop manual) •  Is the circuit normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification.
15	INSPECT MICROPHONE CONTROL CIRCUIT FOR SHORT TO POWER SUPPLY •  Inspect the applicable circuit for a short to power supply. (Refer to the [CIRCUIT INSPECTION] in the workshop manual) •  Is the circuit normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification.
16	INSPECT MICROPHONE CONTROL CIRCUIT FOR OPEN CIRCUIT •  Inspect the applicable circuit for an open circuit. (Refer to the [CIRCUIT INSPECTION] in the workshop manual) •  Is the circuit normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification.
17	VERIFY VOLTAGE SUPPLIED FROM EMERGENCY CALL UNIT CONTROL CIRCUIT •  Measure the voltage at emergency call unit terminal 1W (vehicle wiring harness side). •  Is the voltage approx. 5.43 V?	Yes	Replace the emergency call unit and perform the repair completion verification. (Refer to the [EMERGENCY CALL UNIT REMOVAL/INSTALLATION] in the workshop manual)
		No	Go to the next step.
18	VERIFY VOLTAGE SUPPLIED AT CONTROL CIRCUIT CONTROLLED BY CONNECTIVITY MASTER UNIT (CMU) •  Measure the voltage at connectivity master unit (CMU) terminal 1G. •  Is the voltage approx. 5.43 V?	Yes	Go to the next step.
		No	Replace the connectivity master unit (CMU) and perform the repair completion verification. (Refer to the [CONNECTIVITY MASTER UNIT (CMU) REMOVAL/INSTALLATION] in the workshop manual)
19	INSPECT CONNECTIVITY MASTER UNIT (CMU) CONNECTOR FOR MALFUNCTION •  Inspect the applicable connector and terminal. (Refer to the [CONNECTOR INSPECTION] in the workshop manual) •  Are the connector and terminal normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification.
20	INSPECT EMERGENCY CALL UNIT CONTROL CIRCUIT FOR SHORT TO GROUND •  Inspect the applicable circuit for a short to ground. (Refer to the [CIRCUIT INSPECTION] in the workshop manual) •  Is the circuit normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification.
21	INSPECT EMERGENCY CALL UNIT CONTROL CIRCUIT FOR SHORT TO POWER SUPPLY •  Inspect the applicable circuit for a short to power supply. (Refer to the [CIRCUIT INSPECTION] in the workshop manual) •  Is the circuit normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification.
22	INSPECT EMERGENCY CALL UNIT CONTROL CIRCUIT FOR OPEN CIRCUIT •  Inspect the applicable circuit for an open circuit. (Refer to the [CIRCUIT INSPECTION] in the workshop manual) •  Is the circuit normal?	Yes	Replace the emergency call unit and perform the repair completion verification. (Refer to the [EMERGENCY CALL UNIT REMOVAL/INSTALLATION] in the workshop manual)
		No	Repair or replace the malfunctioning location and perform the repair completion verification.
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 workshop manual) •  Perform the DTC inspection for the connectivity master unit (CMU). (Refer to the [DTC INSPECTION] in the workshop manual) •  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 workshop manual) 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 workshop manual)
		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 workshop manual) •  Are other DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting.
		No	DTC troubleshooting completed.