Mazda 3 Service Manual: Keyless Control Module Inspection

Mazda 3 Service Manual / Accessories / Security & Keyless Entry / Keyless Control Module Inspection

1. Remove the following parts:

a. Passenger-side front scuff plate.

b. Passenger-side front side trim.

c. Grove compartment.

d. Passenger-side lower panel.

2. Measure the voltage according to the terminal voltage table.

If the voltages cannot be verified as indicated in the terminal voltage table, inspect the parts under “Inspection item (s)”.

If the system does not work normally even though the inspection items or related wiring harnesses do not have any malfunction, replace the keyless control module.

Terminal Voltage Table (Reference)


Terminal	Signal name	Connected to	Measurement condition		Voltage (V)	Inspection item (s)
1E	Power supply	ROOM 15 A fuse	Under any condition		B+	ROOM 15 A fuse Battery BCM
1F	Power supply	ENG+B 10 A fuse	Under any condition		B+	ENG+B 10 A fuse Battery
2A	Power supply	METER 15 A fuse	Switch the ignitions to ON		B+	IG1 relay METER 15 A fuse Battery
2A	Power supply	METER 15 A fuse	Switch the ignitions to off or ACC		1.0 or less	IG1 relay METER 15 A fuse Battery
2B	Push button start	Push button start	Push button start is pushed		1.0 or less	Push button start
2B	Push button start	Push button start	Push button start is not pushed		B+	Push button start
2C	Power supply	MIRROR 10 A fuse	Switch the ignitions to ACC		B+	ACC relay MIRROR 10 A fuse Battery
2C	Power supply	MIRROR 10 A fuse	Switch the ignitions to off		1.0 or less	ACC relay MIRROR 10 A fuse Battery
2E	Power supply	HEATER 10 A fuse	Switch the ignitions to ON		B+	IG2 relay HEATER 10 A fuse Battery
2E	Power supply	HEATER 10 A fuse	Switch the ignitions to off or ACC		1.0 or less	IG2 relay HEATER 10 A fuse Battery
2F	Starter monitor	Starter relay	Switch the ignitions to off	Clutch pedal is not depressed (MTX)	Wave pattern 1.	Starter relay
				Shift position is not P or N range (ATX)	Wave pattern 1.
				Clutch pedal is depressed (MTX)	Wave pattern 2.
				Shift position is P or N range (ATX)	Wave pattern 2.
			Switch the ignitions to ON	Clutch pedal is not depressed (MTX)	B+
				Shift position is not P or N range (ATX)	B+
				Clutch pedal is depressed (MTX)	1.0 or less
				Shift position is P or N range (ATX)	1.0 or less
2G	Tx-PATS	Coil antenna	Communication lines, cannot be determined by voltage only (B+ when not communicating)		B+	Coil antenna
2H	Rx-PATS	Coil antenna	Communication lines, cannot be determined by voltage only (B+ when not communicating)		B+	Coil antenna
2K	HS-CAN+	-	Terminal used for communication therefore determination based on terminal voltage inspection not possible.
2L	HS-CAN-	-	Terminal used for communication therefore determination based on terminal voltage inspection not possible.
3B	Starter relay	Starter relay	Cranking		B+	Starter relay
			Switch the ignitions to off	Clutch pedal is not depressed (MTX)	Wave pattern 1.
				Shift position is not P or N range (ATX)	Wave pattern 1.
				Clutch pedal is depressed (MTX)	Wave pattern 2.
				Shift position is P or N range (ATX)	Wave pattern 2.
			Switch the ignitions to ON	Clutch pedal is not depressed (MTX)	B+
				Shift position is not P or N range (ATX)	B+
				Clutch pedal is depressed (MTX)	1.0 or less
				Shift position is P or N range (ATX)	1.0 or less
3C	GND	Body ground	Under any condition		1.0 or less	Body ground
3D	IG 1 relay control	IG 1 Relay	Switch the ignitions to ON		B+	IG 1 Relay
3D	IG 1 relay control	IG 1 Relay	Switch the ignitions to off or ACC		1.0 or less	IG 1 Relay
3F	Push button illumination (ON)	Push button start	Switch the ignitions to off	Clutch pedal (MTX)/Brake pedal (ATX) is depressed	1.0 or less	Push button start
3F	Push button illumination (ON)	Push button start	Switch the ignitions to off	Push button start is pushed	1.0 or less	Push button start
3G	IG 2 relay control	IG 2 Relay	Switch the ignitions to ON		B+	IG 2 Relay
3G	IG 2 relay control	IG 2 Relay	Switch the ignitions to off or ACC		1.0 or less	IG 2 Relay
3H	Push button illumination (Umber)	Push button start	System is malfunctioning		1.0 or less	Push button start
3H	Push button illumination (Umber)	Push button start	Other		B+	Push button start
3I	Push button illumination (green)	Push button start	Engine start is available		1.0 or less	Push button start
3I	Push button illumination (green)	Push button start	Other		B+	Push button start
3J	ACC relay control	ACC Relay	Switch the ignitions to ACC		B+	ACC Relay
3J	ACC relay control	ACC Relay	Switch the ignitions to off		1.0 or less	ACC Relay
3K	Push button illumination (ACC)	Push button start	In the case of ACC		1.0 or less	Push button start
3K	Push button illumination (ACC)	Push button start	Case except the ACC		B+	Push button start
3M	Power supply	Coil antenna	Communication lines, cannot be determined by voltage only (B+ when not communicating)		B+	Coil antenna
3O*1	Starter interlock switch	Starter interlock switch	Clutch pedal is not depressed		B+	Starter interlock switch
3O*1	Starter interlock switch	Starter interlock switch	Clutch pedal is depressed		1.0 or less	Starter interlock switch
3Q	Push button start	Push button start	Push button start is pushed		1.0 or less	Push button start
3Q	Push button start	Push button start	Push button start is not pushed		B+	Push button start
3R	Brake switch	Brake switch	Brake pedal is depressed		B+	Brake switch
3R	Brake switch	Brake switch	Brake pedal is not depressed		1.0 or less	Brake switch
3S*2	P position	P position switch	Shift position is P		B+	P position switch
3S*2	P position	P position switch	Other		1.0 or less	P position switch
3T	Starter cut relay (MTX)	Starter cut relay	Switch the ignitions to off	Clutch pedal is depressed	Wave pattern 2.	Starter cut relay
	Starter cut relay (MTX)	Starter cut relay		Shift position is P or N range	Wave pattern 2.	Starter cut relay
	TR switch (ATX)	TR switch		Clutch pedal is not depressed	1.0 or less	TR switch
	TR switch (ATX)	TR switch		Shift position is not P or N range	1.0 or less	TR switch
3U	Key reminder switch signal	Key reminder switch	Key inserted in steering lock		B+	Key reminder switch
3U	Key reminder switch signal	Key reminder switch	Other		1.0 or less	Key reminder switch
3V	Power supply	Keyless receiver	Under any condition		B+	Keyless receiver
3W	Keyless entry communication	Keyless receiver	Terminal used for communication therefore determination based on terminal voltage inspection not possible.
3X	BCM communication	BCM	Communication lines, cannot be determined by voltage only (B+ when not communicating)		B+	BCM
3Z	Keyless antenna (interior, front)	Keyless antenna (interior, front)	Terminal used for communication therefore determination based on terminal voltage inspection not possible.
3AA	Keyless entry communication	Keyless receiver	Terminal used for communication therefore determination based on terminal voltage inspection not possible.
3AC	Keyless antenna (interior, front)	Keyless antenna (interior, front)	Terminal used for communication therefore determination based on terminal voltage inspection not possible.
3AD	GND	Body ground	Under any condition		1.0 or less	Body ground
4A	Keyless antenna (RF)	Keyless antenna (RF)	Terminal used for communication therefore determination based on terminal voltage inspection not possible.
4B	Keyless antenna (LF)	Keyless antenna (LF)	Terminal used for communication therefore determination based on terminal voltage inspection not possible.
4C	Keyless antenna (exterior, rear)	Keyless antenna (exterior, rear)	Terminal used for communication therefore determination based on terminal voltage inspection not possible.
4D	Keyless antenna (RF)	Keyless antenna (RF)	Terminal used for communication therefore determination based on terminal voltage inspection not possible.
4E	Keyless antenna (LF)	Keyless antenna (LF)	Terminal used for communication therefore determination based on terminal voltage inspection not possible.
4F	Keyless antenna (exterior, rear)	Keyless antenna (exterior, rear)	Terminal used for communication therefore determination based on terminal voltage inspection not possible.
4G	Keyless antenna (interior, rear)	Keyless antenna (interior, rear)	Terminal used for communication therefore determination based on terminal voltage inspection not possible.
4I	GND	Body ground	Under any condition		1.0 or less	Body ground
4J	Keyless antenna (interior, rear)	Keyless antenna (interior, rear)	Terminal used for communication therefore determination based on terminal voltage inspection not possible.
4L	Keyless beeper power supply	Keyless beeper	Exterior keyless beeper sounds		5.0 or more	Keyless beeper
4L	Keyless beeper power supply	Keyless beeper	Other		1.0 or less	Keyless beeper
4O	Request switch input (passenger's door)	Request switch (RF)	Passenger's side request switch ON		1.0 or less	Front outer handle (passenger's door)
4O	Request switch input (passenger's door)	Request switch (RF)	Passenger's side request switch OFF		4.0 or more	Front outer handle (passenger's door)
4R	Request switch input (driver's door)	Request switch (LF)	Driver's side request switch ON		1.0 or less	Front outer handle (driver's door)
4R	Request switch input (driver's door)	Request switch (LF)	Driver's side request switch OFF		4.0 or more	Front outer handle (driver's door)
4S	Trunk lid/liftgate release input	Trunk lid/liftgate opener switch	Trunk lid/liftgate opener switch pressed		3.0 or more	Trunk lid opener switch Liftgate opener switch
4S	Trunk lid/liftgate release input	Trunk lid/liftgate opener switch	Trunk lid/liftgate opener switch released		1.0 or less	Trunk lid opener switch Liftgate opener switch
4T*3	Request switch input (Liftgate)	Request switch (Liftgate)	Liftgate request switch ON		1.0 or less	Request switch (Liftgate)
4T*3	Request switch input (Liftgate)	Request switch (Liftgate)	Liftgate request switch OFF		4.0 or more	Request switch (Liftgate)
4U	Lock input	Door lock-link switch (driver's door)	Driver's side door lock switch at LOCK		1.0 or less	Door lock-link switch
4U	Lock input	Door lock-link switch (driver's door)	Driver's side door lock switch at UNLOCK		Wave pattern.	Door lock-link switch
4V*1	Clutch pedal position switch	Clutch pedal position switch	Clutch pedal is depressed		1.0 or less	Clutch pedal position switch
4V*1	Clutch pedal position switch	Clutch pedal position switch	Clutch pedal is not depressed		B+	Clutch pedal position switch
4W	Brake switch	Brake switch	Brake pedal is depressed		B+	Brake switch
4W	Brake switch	Brake switch	Brake pedal is not depressed		1.0 or less	Brake switch
4X*1	Neutral switch	Neutral switch	Shift lever is in neutral position		1.0 or less	Neutral switch
4X*1	Neutral switch	Neutral switch	Shift lever is not in neutral position		B+	Neutral switch
4Z	GND	Keyless beeper	Under any condition		1.0 or less	Keyless beeper
4AA	GND	Body ground	Under any condition		1.0 or less	Body ground

*1 MTX

*2 ATX

*3 5HB

Generated pulse (reference)

Pattern 1

Terminal:

Starter relay: 2F (+) ↔ body ground (-)
Starter relay: 3B (+) ↔ body ground (-)

Oscilloscope setting: 2 V/DIV (Y), 1 ms/DIV (X), DC range

Pattern 2

Terminal:

Starter relay: 2F (+) ↔ body ground (-)
Starter relay: 3B (+) ↔ body ground (-)
Starter cut relay/TR switch: 3T (+) ↔ body ground (-)

Oscilloscope setting: 2 V/DIV (Y), 1 ms/DIV (X), DC range

Pattern 3

Terminal:

Door lock-link switch (driver's door): 4U (+) ↔ body ground (-)

Oscilloscope setting: 2 V/DIV (Y), 1 ms/DIV (X), DC range

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