DTC U2142:00 [MAZDA ERA-GLONASS CONTROL MODULE]

id0902r6542200

Outline

System malfunction location	Communication error with emergency call microphone
Detection condition	•  The Mazda ERA-GLONASS control module detects any of the following conditions. ―  The Mazda ERA-GLONASS control module could not receive any signal from the emergency call microphone, Mazda ERA-GLONASS speaker. ―  The Mazda ERA-GLONASS control module received error signal for a continuous 2 times from the emergency call microphone.
Fail-safe	Not applicable
Possible cause	•  Mazda ERA-GLONASS speaker connector or terminal malfunction •  Mazda ERA-GLONASS speaker malfunction •  Emergency call microphone connector or terminal malfunction •  Short to ground in wiring harness between the following terminals: ―  Emergency call microphone terminal A and Mazda ERA-GLONASS speaker terminal B ―  Emergency call microphone terminal C and Mazda ERA-GLONASS speaker terminal A •  Open circuit in wiring harness between the following terminals: ―  Emergency call microphone terminal A and Mazda ERA-GLONASS speaker terminal B ―  Emergency call microphone terminal C and Mazda ERA-GLONASS speaker terminal A •  Short to power supply in wiring harness between the following terminals: ―  Emergency call microphone terminal A and Mazda ERA-GLONASS speaker terminal B ―  Emergency call microphone terminal C and Mazda ERA-GLONASS speaker terminal A •  Mazda ERA-GLONASS control module connector or terminal malfunction •  Short to ground in wiring harness between the following terminals: ―  Mazda ERA-GLONASS control module terminal 1N and emergency call microphone terminal I ―  Mazda ERA-GLONASS control module terminal 1L and emergency call microphone terminal K ―  Mazda ERA-GLONASS control module terminal 1Y and emergency call microphone terminal D ―  Mazda ERA-GLONASS control module terminal 1G and emergency call microphone terminal H ―  Mazda ERA-GLONASS control module terminal 1I and emergency call microphone terminal J ―  Mazda ERA-GLONASS control module terminal 1E and emergency call microphone terminal B ―  Mazda ERA-GLONASS control module terminal 1J and emergency call microphone terminal L •  Open circuit in wiring harness between the following terminals: ―  Mazda ERA-GLONASS control module terminal 1N and emergency call microphone terminal I ―  Mazda ERA-GLONASS control module terminal 1L and emergency call microphone terminal K ―  Mazda ERA-GLONASS control module terminal 1Y and emergency call microphone terminal D ―  Mazda ERA-GLONASS control module terminal 1G and emergency call microphone terminal H ―  Mazda ERA-GLONASS control module terminal 1I and emergency call microphone terminal J ―  Mazda ERA-GLONASS control module terminal 1E and emergency call microphone terminal B ―  Mazda ERA-GLONASS control module terminal 1J and emergency call microphone terminal L •  Short to power supply in wiring harness between the following terminals: ―  Mazda ERA-GLONASS control module terminal 1N and emergency call microphone terminal I ―  Mazda ERA-GLONASS control module terminal 1L and emergency call microphone terminal K ―  Mazda ERA-GLONASS control module terminal 1Y and emergency call microphone terminal D ―  Mazda ERA-GLONASS control module terminal 1G and emergency call microphone terminal H ―  Mazda ERA-GLONASS control module terminal 1I and emergency call microphone terminal J ―  Mazda ERA-GLONASS control module terminal 1E and emergency call microphone terminal B ―  Mazda ERA-GLONASS control module terminal 1J and emergency call microphone terminal L •  Emergency call microphone malfunction •  Mazda ERA-GLONASS control module malfunction

Diagnostic Procedure

Step	Inspection	Results	Action
1	INSPECT MAZDA ERA-GLONASS SPEAKER CONNECTOR CONDITION •  Switch the ignition off. •  Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Disconnect the Mazda ERA-GLONASS speaker connector. (See MAZDA ERA-GLONASS SPEAKER REMOVAL/INSTALLATION.) •  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection. •  Is the connector normal?	Yes	Go to the next step.
		No	Repair or replace the connector, then go to Step 12.
2	INSPECT MAZDA ERA-GLONASS SPEAKER •  Inspect the Mazda ERA-GLONASS speaker. (See MAZDA ERA-GLONASS SPEAKER INSPECTION.) •  Is the Mazda ERA-GLONASS speaker normal?	Yes	Go to the next step.
		No	Replace the Mazda ERA-GLONASS speaker, then go to Step 12. (See MAZDA ERA-GLONASS SPEAKER REMOVAL/INSTALLATION.)
3	INSPECT EMERGENCY CALL MICROPHONE CONNECTOR CONDITION •  Switch the ignition off. •  Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Disconnect the emergency call microphone connector. (See EMERGENCY CALL MICROPHONE REMOVAL/INSTALLATION.) •  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection. •  Is the connector normal?	Yes	Go to the next step.
		No	Repair or replace the connector, then go to Step 12.
4	INSPECT MAZDA ERA-GLONASS SPEAKER CIRCUIT FOR SHORT TO GROUND •  Verify that the Mazda ERA-GLONASS speaker and Mazda ERA-GLONASS control module connectors are disconnected. •  Inspect for continuity between the following terminals (wiring harness-side) and body ground. ―  Emergency call microphone terminal A ―  Emergency call microphone terminal C •  Is there continuity?	Yes	See wiring diagram and verify if there is a common connector between the following terminals: •  Emergency call microphone terminal A and Mazda ERA-GLONASS speaker terminal B •  Emergency call microphone terminal C and Mazda ERA-GLONASS speaker terminal A If there is a common connector: •  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to ground to determine the malfunctioning location. •  Repair or replace the malfunctioning location. If there is no common connector: •  Repair or replace the wiring harness which is shorted to ground. Go to Step 12.
		No	Go to the next step.
5	INSPECT MAZDA ERA-GLONASS SPEAKER CIRCUIT FOR OPEN CIRCUIT •  Verify that the Mazda ERA-GLONASS speaker and Mazda ERA-GLONASS control module connectors are disconnected. •  Inspect for continuity between the following terminals (wiring harness-side): ―  Emergency call microphone terminal A ―  Emergency call microphone terminal C •  Is there continuity?	Yes	Go to the next step.
		No	See wiring diagram and verify if there is a common connector between the following terminals: •  Emergency call microphone terminal A and Mazda ERA-GLONASS speaker terminal B •  Emergency call microphone terminal C and Mazda ERA-GLONASS speaker terminal A If there is a common connector: •  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location. •  Repair or replace the malfunctioning location. If there is no common connector: •  Repair or replace the wiring harness which has an open circuit. Go to Step 12.
6	INSPECT MAZDA ERA-GLONASS SPEAKER CIRCUIT FOR SHORT TO POWER SUPPLY •  Verify that the Mazda ERA-GLONASS speaker and Mazda ERA-GLONASS control module connectors are disconnected. •  Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Switch the ignition ON (engine off or on) •  Measure the voltage at the following terminals (wiring harness-side): ―  Emergency call microphone terminal A ―  Emergency call microphone terminal C •  Is the voltage 0 V?	Yes	Go to the next step.
		No	See wiring diagram and verify if there is a common connector between the following terminals: •  Emergency call microphone terminal A and Mazda ERA-GLONASS speaker terminal B •  Emergency call microphone terminal C and Mazda ERA-GLONASS speaker terminal A If there is a common connector: •  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to power supply to determine the malfunctioning location. •  Repair or replace the malfunctioning location. If there is no common connector: •  Repair or replace the wiring harness which is shorted to power supply. Go to Step 12.
7	INSPECT MAZDA ERA-GLONASS CONTROL MODULE CONNECTOR CONDITION •  Disconnect the Mazda ERA-GLONASS control module connector. (See MAZDA ERA-GLONASS CONTROL MODULE REMOVAL/INSTALLATION.) •  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection. •  Is the connector normal?	Yes	Go to the next step.
		No	Repair or replace the connector, then go to Step 12.
8	INSPECT EMERGENCY CALL MICROPHONE CIRCUIT FOR SHORT TO GROUND •  Verify that the Mazda ERA-GLONASS speaker and Mazda ERA-GLONASS control module connectors are disconnected. •  Inspect for continuity between the following terminals (wiring harness-side) and body ground. ―  Mazda ERA-GLONASS control module terminal 1N ―  Mazda ERA-GLONASS control module terminal 1L ―  Mazda ERA-GLONASS control module terminal 1Y ―  Mazda ERA-GLONASS control module terminal 1G ―  Mazda ERA-GLONASS control module terminal 1I ―  Mazda ERA-GLONASS control module terminal 1E ―  Mazda ERA-GLONASS control module terminal 1J •  Is there continuity?	Yes	See wiring diagram and verify if there is a common connector between the following terminals: •  Mazda ERA-GLONASS control module terminal 1N and emergency call microphone terminal I •  Mazda ERA-GLONASS control module terminal 1L and emergency call microphone terminal K •  Mazda ERA-GLONASS control module terminal 1Y and emergency call microphone terminal D •  Mazda ERA-GLONASS control module terminal 1G and emergency call microphone terminal H •  Mazda ERA-GLONASS control module terminal 1I and emergency call microphone terminal J •  Mazda ERA-GLONASS control module terminal 1E and emergency call microphone terminal B If there is a common connector: •  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to ground to determine the malfunctioning location. •  Repair or replace the malfunctioning location. If there is no common connector: •  Repair or replace the wiring harness which is shorted to ground. Go to Step 12.
		No	Go to the next step.
9	INSPECT EMERGENCY CALL MICROPHONE CIRCUIT FOR OPEN CIRCUIT •  Verify that the Mazda ERA-GLONASS speaker and Mazda ERA-GLONASS control module connectors are disconnected. •  Inspect for continuity between the following terminals (wiring harness-side): ―  Mazda ERA-GLONASS control module terminal 1N ―  Mazda ERA-GLONASS control module terminal 1L ―  Mazda ERA-GLONASS control module terminal 1Y ―  Mazda ERA-GLONASS control module terminal 1G ―  Mazda ERA-GLONASS control module terminal 1I ―  Mazda ERA-GLONASS control module terminal 1E ―  Mazda ERA-GLONASS control module terminal 1J •  Is there continuity?	Yes	Go to the next step.
		No	See wiring diagram and verify if there is a common connector between the following terminals: •  Mazda ERA-GLONASS control module terminal 1N and emergency call microphone terminal I •  Mazda ERA-GLONASS control module terminal 1L and emergency call microphone terminal K •  Mazda ERA-GLONASS control module terminal 1Y and emergency call microphone terminal D •  Mazda ERA-GLONASS control module terminal 1G and emergency call microphone terminal H •  Mazda ERA-GLONASS control module terminal 1I and emergency call microphone terminal J •  Mazda ERA-GLONASS control module terminal 1E and emergency call microphone terminal B If there is a common connector: •  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location. •  Repair or replace the malfunctioning location. If there is no common connector: •  Repair or replace the wiring harness which has an open circuit. Go to Step 12.
10	INSPECT EMERGENCY CALL MICROPHONE CIRCUIT FOR SHORT TO POWER SUPPLY •  Verify that the Mazda ERA-GLONASS speaker and Mazda ERA-GLONASS control module connectors are disconnected. •  Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Switch the ignition ON (engine off or on) •  Measure the voltage at the following terminals (wiring harness-side): ―  Mazda ERA-GLONASS control module terminal 1N ―  Mazda ERA-GLONASS control module terminal 1L ―  Mazda ERA-GLONASS control module terminal 1Y ―  Mazda ERA-GLONASS control module terminal 1G ―  Mazda ERA-GLONASS control module terminal 1I ―  Mazda ERA-GLONASS control module terminal 1E ―  Mazda ERA-GLONASS control module terminal 1J •  Is the voltage 0 V?	Yes	Go to the next step.
		No	See wiring diagram and verify if there is a common connector between the following terminals: •  Mazda ERA-GLONASS control module terminal 1N and emergency call microphone terminal I •  Mazda ERA-GLONASS control module terminal 1L and emergency call microphone terminal K •  Mazda ERA-GLONASS control module terminal 1Y and emergency call microphone terminal D •  Mazda ERA-GLONASS control module terminal 1G and emergency call microphone terminal H •  Mazda ERA-GLONASS control module terminal 1I and emergency call microphone terminal J •  Mazda ERA-GLONASS control module terminal 1E and emergency call microphone terminal B If there is a common connector: •  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to power supply to determine the malfunctioning location. •  Repair or replace the malfunctioning location. If there is no common connector: •  Repair or replace the wiring harness which is shorted to power supply. Go to Step 12.
11	PERFORM DTC INSPECTION AND VERIFY IF MALFUNCTIONING LOCATION IS EMERGENCY CALL MICROPHONE •  Always reconnect all disconnected connectors. •  Reconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Clear the DTC for the Mazda ERA-GLONASS control module using the M-MDS. (See CLEARING DTC [MAZDA ERA-GLONASS CONTROL MODULE]) •  Switch the ignition ON (engine off or on) and wait for 25 s or more. •  Perform the DTC inspection for the Mazda ERA-GLONASS control module using the M-MDS. (See DTC INSPECTION [MAZDA ERA-GLONASS CONTROL MODULE]) •  Is the same DTC displayed?	Yes	Replace the emergency call microphone, then go to the next step. (See EMERGENCY CALL MICROPHONE REMOVAL/INSTALLATION.)
		No	Go to Step 13.
12	VERIFY THAT REPAIRS HAVE BEEN COMPLETED •  Always reconnect all disconnected connectors. •  Reconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Clear the DTC for the Mazda ERA-GLONASS control module using the M-MDS. (See CLEARING DTC [MAZDA ERA-GLONASS CONTROL MODULE]) •  Switch the ignition ON (engine off or on) and wait for 25 s or more. •  Perform the DTC inspection for the Mazda ERA-GLONASS control module using the M-MDS. (See DTC INSPECTION [MAZDA ERA-GLONASS CONTROL MODULE]) •  Is the same DTC displayed?	Yes	Repeat the inspection from Step 1. •  If the malfunction recurs, replace the Mazda ERA-GLONASS control module. (See MAZDA ERA-GLONASS CONTROL MODULE REMOVAL/INSTALLATION.) Go to the next step.
		No	Go to the next step.
13	VERIFY IF OTHER DTCs DISPLAYED •  Are any other DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [MAZDA ERA-GLONASS CONTROL MODULE])
		No	DTC troubleshooting completed.