LF Control Unit Inspection: Notes

Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
Remove the service hole cover on the front side trim. (See LF CONTROL UNIT REMOVAL/INSTALLATION .)
Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
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).
- If the system does not work normally even though the inspection items are normal, replace the LF control unit.

Terminal voltage table (reference)

Courtesy of MAZDA MOTORS CORP.

TERMINAL VOLTAGE REFERENCE

Terminal	Signal name	Connected to	Measurement conditions	Voltage (V)	Inspection item(s)
A	Request switch signal (Passenger's side)	Request switch (RF)	When passenger's side request switch is pressed	1.0 or less	Front outer handle (passenger's side) Related wiring harness
A	Request switch signal (Passenger's side)	Request switch (RF)	When passenger's side request switch is not pressed	5.0
B	Power supply	INTERIOR 10 A fuse	Under any condition	B+	INTERIOR 10 A fuse Battery Related wiring harness
C	Request switch signal (Driver's side)	Request switch (LF)	When driver's side request switch is pressed	1.0 or less	Front outer handle (driver's side) Related wiring harness
C	Request switch signal (Driver's side)	Request switch (LF)	When driver's side request switch is not pressed	5.0	Front outer handle (driver's side) Related wiring harness
D	-	-	-	-	-
E	Request switch signal (liftgate)	Request switch (Liftgate)	When liftgate request switch is pressed	1.0 or less	Request switch (Liftgate) Related wiring harness
E	Request switch signal (liftgate)	Request switch (Liftgate)	When liftgate request switch is not pressed	5.0	Request switch (Liftgate) Related wiring harness
F	-	-	-	-	-
G	Start stop unit signal	Start stop unit	Because this terminal is for communication, integrity determination using terminal voltage inspection is not possible.
H	Keyless beeper power supply	Keyless beeper	When lock button on remote transmitter is pressed	Wave pattern (See INSPECTION USING AN OSCILLOSCOPE (REFERENCE) .)	Related wiring harness Keyless beeper
H	Keyless beeper power supply	Keyless beeper	Except above	1.0 or less	Related wiring harness Keyless beeper
I	Start stop unit signal	Start stop unit	Because this terminal is for communication, integrity determination using terminal voltage inspection is not possible.
J	Keyless beeper ground	Keyless beeper	Under any condition	1.0 or less	Related wiring harness Keyless beeper
K	Keyless antenna (interior, front)	Keyless antenna (interior, front)	Because this terminal is for communication, integrity determination using terminal voltage inspection is not possible.
L	GROUND	Body ground	Under any condition	1.0 or less	Body ground
M	Keyless antenna (interior, front)	Keyless antenna (interior, front)	Because this terminal is for communication, integrity determination using terminal voltage inspection is not possible.
N	-	-	-	-	-
O	Keyless antenna (exterior, LF)	Keyless antenna (exterior, LF)	Because this terminal is for communication, integrity determination using terminal voltage inspection is not possible.
P	Keyless antenna (interior, center)	Keyless antenna (interior, center)	Because this terminal is for communication, integrity determination using terminal voltage inspection is not possible.
Q	Keyless antenna (exterior, LF)	Keyless antenna (exterior, LF)	Because this terminal is for communication, integrity determination using terminal voltage inspection is not possible.
R	Keyless antenna (interior, center)	Keyless antenna (interior, enter)	Because this terminal is for communication, integrity determination using terminal voltage inspection is not possible.
S	Keyless antenna (exterior, RF)	Keyless antenna (exterior, RF)	Because this terminal is for communication, integrity determination using terminal voltage inspection is not possible.
T	Keyless antenna (interior, rear)	Keyless antenna (interior, rear)	Because this terminal is for communication, integrity determination using terminal voltage inspection is not possible.
U	Keyless antenna (exterior, RF)	Keyless antenna (exterior, RF)	Because this terminal is for communication, integrity determination using terminal voltage inspection is not possible.
V	Keyless antenna (interior, rear)	Keyless antenna (interior, rear)	Because this terminal is for communication, integrity determination using terminal voltage inspection is not possible.
W	Keyless antenna (exterior, rear)	Keyless antenna (exterior, rear)	Because this terminal is for communication, integrity determination using terminal voltage inspection is not possible.
X	Keyless antenna (exterior, rear)	Keyless antenna (exterior, rear)	Because this terminal is for communication, integrity determination using terminal voltage inspection is not possible.