LF Control Unit Inspection: Notes

Remove the service hole cover on the front side trim. (See LF CONTROL UNIT REMOVAL/INSTALLATION .)
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. (See LF CONTROL UNIT REMOVAL/INSTALLATION .)
Terminal Voltage Table (Reference)

Fig 1: LF Control Unit Wiring Harnesses Side Connector
Courtesy of MAZDA MOTORS CORP.

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	ROOM 15 A fuse	Under any condition	B+	ROOM 15 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	Request switch	When liftgate request switch is pressed	1.0 or less	Request switch Related wiring harness
E	Request switch signal	Request switch	When liftgate request switch is not pressed	5.0	Request switch 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 Pattern 1 .)	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	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	-	-	-	-	-
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	-	-	-	-	-
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.