Telematics Communication Unit Inspection

1. Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION (US) .)
2. Remove the following parts:
   1. Passenger side lower panel (See LOWER PANEL REMOVAL/INSTALLATION (US) .)
3. Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION (US))
4. Measure the voltage at each terminal.
   • If the voltage is not as specified in the terminal voltage table, inspect the parts under Inspection item(s) and related wiring harnesses.
     • If the system does not work normally even though the inspection items or related wiring harnesses do not have any malfunction, replace the telematics communication unit. (See TELEMATICS COMMUNICATION UNIT REMOVAL/INSTALLATION .)

Courtesy of MAZDA MOTORS CORP.

Terminal	Signal name	Connected to	Measurement conditions	Voltage (V)	Inspection item(s)
1A	-	-	-	-	-
1B	-	-	-	-	-
1C	-	-	-	-	-
1D	-	-	-	-	-
1E	-	-	-	-	-
1F	-	-	-	-	-
1G	-	-	-	-	-
1H	-	-	-	-	-
1I	-	-	-	-	-
1J	-	-	-	-	-
1K	-	-	-	-	-
1L	-	-	-	-	-
1M	-	-	-	-	-
1N	-	-	-	-	-
1O	GND1	Body ground	Under any condition	Approx. 0	GND point Related wiring harness
1P	-	-	-	-	-
1Q	HS CAN_H	CAN system related module	Because this terminal is for communication, determination using terminal voltage inspection is not possible.
1R	GND3	Body ground	Under any condition	Approx. 0	GND point Related wiring harness
1S	HS CAN_L	CAN system related module	Because this terminal is for communication, determination using terminal voltage inspection is not possible.
1T	GND4	Body ground	Under any condition	Approx. 0	GND point Related wiring harness
1U	GND2	Body ground	Under any condition	Approx. 0	GND point Related wiring harness
1V	-	-	-	-	-
1W	-	-	-	-	-
1X	-	-	-	-	-
1Y	-	-	-	-	-
1Z	-	-	-	-	-
1AA	ENS2_IN	SAS control module	Because this terminal is for communication, determination using terminal voltage inspection is not possible.
1AB	-	-	-	-	-
1AC	ENS2_OUT	Electrical supply unit (ESU)	Because this terminal is for communication, determination using terminal voltage inspection is not possible.
1AD	-	-	-	-	-
1AE	IG1	F48 7.5A fuse	Switch the ignition ON (engine on or off)	B+	F48 7.5A fuse Related wiring harness
			Switch the ignition OFF (LOCK)	1.0 or less
1AF	+B	F46 15 A fuse	Under any condition	B+	F46 15 A fuse Battery Related wiring harness
2A	TEL_SIG1	Tel antenna No. 1	Because this terminal is for communication, determination using terminal voltage inspection is not possible.
2B	GNSS_SIG1	Tel antenna No. 1	Because this terminal is for communication, determination using terminal voltage inspection is not possible.
3A	TEL_SIG2	Tel antenna No. 2	Because this terminal is for communication, determination using terminal voltage inspection is not possible.
4A	USB1_GND	Connectivity master unit	Under any condition	1.0 or less	Connectivity master unit Related wiring harness
4B	USB1_DATA_P	Connectivity master unit	Because this terminal is for communication, determination using terminal voltage inspection is not possible.
4C	USB1_VBUS	Connectivity master unit	Under any condition	Approx. 5.0	Connectivity master unit Related wiring harness
4D	USB1_DATA_N	Connectivity master unit	Because this terminal is for communication, determination using terminal voltage inspection is not possible.