Manual pages - MX5 Manual | Mazda MX5 (Mk4) 2015+

START STOP UNIT INSPECTION

NOTE:

Terminals with terminal voltage that cannot be measured are not indicated in the terminal voltage table (reference).

1. Remove the Column cover. (See COLUMN COVER REMOVAL/INSTALLATION.)

2. Verify that the voltages of each of the terminals are as indicated in the terminal voltage table (reference).

If the voltage is not as specified in the terminal voltage table (reference), 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 start stop unit. (See START STOP UNIT REMOVAL/INSTALLATION.)

Terminal Voltage Table (Reference)

Terminal	Signal name	Connected to	Measurement conditions		Voltage (V)	Inspection item(s)
1A	Power supply	INTERIOR 15A fuse	Under any condition		B+	ROOM 25A fuse INTERIOR 15A fuse Battery
1B	Power supply	C/U IG1 15 A fuse	Ignition switched ON (engine off or on)		B+	C/U IG1 15 A fuse Battery
			Ignition switched off or at ACC		1.0 or less
1C	Brake switch	Brake switch	Brake pedal depressed		B+	Brake switch
			Brake pedal not depressed		1.0 or less
1D	Starter monitor (MT)	Starter relay	Ignition switched ON (engine off or on)	Clutch pedal not depressed	B+	Starter relay Battery PCM Starter Interlock Switch
				Clutch pedal depressed	1.0 or less
	Starter monitor (AT)	Starter relay	Ignition switched ON (engine off or on)	Other than selector lever is in P or N position	B+	Starter relay Battery PCM TCM
				Selector lever is in P or N position	1.0 or less
1E	ACC monitor	MIRROR 7.5 A fuse	Switch the ignition to ACC or ON (engine off)		B+	Outlet cigarette socket MIRROR 7.5 A fuse ACC relay
			Ignition switched off		1.0 or less
1F	Starter interlock switch (MT)	Starter interlock switch	Clutch pedal not depressed		B+	Starter interlock switch
			Clutch pedal depressed		1.0 or less
	Selector lever position switch (AT)	Transmission range switch	Other than selector lever is in P or N position		B+	TCM
			Selector lever is in P or N position		1.0 or less
1G	Hazard warning switch signal	Hazard warning switch	Hazard warning switch not pressed (OFF)		B+	Hazard warning switch
			Hazard warning switch pressed (ON)		1.0 or less
1H	Push button start 1	Push button start	Push button start pressed		1.0 or less	Push button start
			Push button start not pressed		B+
1I	Push button illumination	Push button start	Integrity determination using terminal voltage inspection is not possible.			Push button start
1J^*1	P position	Not P position switch	Selector lever is in P position		B+	Not P position switch
			Except above		1.0 or less
1K	Push button illumination (green)	Push button start	Engine starting conditions are met		1.0 or less	Push button start
			Except above		B+
1L^*5	Steering shift switch (up)	Steering shift switch	Steering shift switch (up) pressed		1.0 or less	Steering shift switch
			Steering shift switch (up) not pressed		B+
1M	Push button illumination (amber)	Push button start	Ignition switched to ACC or ON (engine off)		1.0 or less	Push button start
			Except above		B+
1N^*5	Steering shift switch (down)	Steering shift switch	Steering shift switch (down) pressed		1.0 or less	Steering shift switch
			Steering shift switch (down) not pressed		B+
1P	Lock input	Door lock-link switch (driver's door)	Driver's door locked		1.0 or less	Door lock-link switch (driver's door)
			Driver's door unlocked		Approx. 5
1Q	BCM	BCM	Because this terminal is for communication, integrity determination using terminal voltage inspection is not possible.
1S^*6	Steering angle sensor power supply	Steering angle sensor	The specified time has elapsed since key placed outside vehicle and all doors locked		1.0 or less	Steering angle sensor
			Except above		Approx. 5
1T^*6	Steering angle sensor ground	Steering angle sensor	Under any condition		1.0 or less	Steering angle sensor
1U^*6	Steering angle sensor (signal A/D1)	Steering angle sensor	Steering wheel is turned to left and right		4.00???4.75???0.25???0.75	Steering angle sensor
1W^*6	Steering angle sensor (signal A/D1)	Steering angle sensor	Steering wheel is turned to left and right		4.00???4.75???0.25???0.75	Steering angle sensor
1Y	Cruise control switch signal	Cruise control switch	RESUME/+ switch is pressed		Approx. 0.7	Cruise control switch
			OFF/CANCEL switch is pressed		Approx. 0
			ON switch is pressed		Approx. 1.1
			SET/- switch is pressed		Approx. 0.3
			Except above		Approx. 5
1Z	Cruise control switch ground	Cruise control switch	Under any condition		1.0 or less	Cruise control switch
1AA	Steering switch signal	Steering switch	Up switch is pressed		1.0 or less	Steering switch
			Down switch is pressed		Approx. 1.2
			INFO button is pressed		Approx. 2.2
			Except above		Approx. 3.3
1AB	Steering switch ground	Steering switch	Under any condition		1.0 or less	Steering switch
1AC	PATS+	Coil antenna (push button start)	Because this terminal is for communication, integrity determination using terminal voltage inspection is not possible.
1AE	PATS-	Coil antenna (push button start)	Because this terminal is for communication, integrity determination using terminal voltage inspection is not possible.
1AF	GROUND	Body ground	Under any condition		1.0 or less	Body ground
2A	GROUND	Body ground	Under any condition		1.0 or less	Body ground
2B	GROUND	Body ground	Under any condition		1.0 or less	Body ground
2C	ACC relay control	ACC relay	Switch the ignition to ACC or ON (engine off or on)		B+	ACC relay
			Ignition switched off		1.0 or less
2E*²	Clutch pedal position switch	Clutch pedal position switch	Clutch pedal not depressed		B+	Clutch pedal position switch
			Clutch pedal depressed		1.0 or less
2F*³	LF control unit communication	LF control unit	Because this terminal is for communication, integrity determination using terminal voltage inspection is not possible.
2G*¹	Shift lock	Shift lock solenoid	Ignition switch ON (engine off or on)	Selector lever at position except P	B+	Shift lock solenoid
				Selector lever at P position and brake pedal depressed	1.0 or less
2H*³	LF control unit communication	LF control unit	Because this terminal is for communication, integrity determination using terminal voltage inspection is not possible.
2I*⁴	Keyless antenna (inside vehicle, center)	Keyless antenna (interior, front)	Because this terminal is for communication, integrity determination using terminal voltage inspection is not possible.
2J	Push button start 2	Push button start	Push button start pressed		1.0 or less	Push button start
			Push button start not pressed		B+
2K*⁴	Keyless antenna (inside vehicle, center)	Keyless antenna (interior, front)	Because this terminal is for communication, integrity determination using terminal voltage inspection is not possible.
2L*⁴	GROUND	Shield ground	Under any condition		1.0 or less	Body ground
2M	HS-CAN+	-	Because this terminal is for communication, integrity determination using terminal voltage inspection is not possible.
2O	HS-CAN-	-	Because this terminal is for communication, integrity determination using terminal voltage inspection is not possible.
2Q	Keyless receiver power supply	Keyless receiver	Under any condition		Approx. 5	Keyless receiver
2R	Keyless receiver communication	Keyless receiver	Because this terminal is for communication, integrity determination using terminal voltage inspection is not possible.
2S	IG1 relay control	IG1 relay	Ignition switched ON (engine off or on)		B+	IG1 relay
			Ignition switched off or at ACC		1.0 or less
2V	Starter relay	Starter relay	When cranking		B+	Starter relay PCM Start stop unit
			Except above^*7		1.0 or less, or B+^*7
2W	Power supply	AT 15 A fuse	Under any condition		B+	AT 15 A fuse Battery

*1: AT
*2: MT
*3: With advanced keyless entry system
*4: With keyless entry system
*5: With steering shift switch
*6: With smart city brake support (SCBS)
*7: Because the voltage varies depending on the vehicle conditions, examination using the terminal voltage inspection is not possible.

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Knowledge Base

START STOP UNIT INSPECTION

Terminal Voltage Table (Reference)