LF CONTROL UNIT INSPECTION


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1.  Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.)

2.  Remove the service hole cover on the front side trim. (See LF CONTROL UNIT REMOVAL/INSTALLATION.)

3.  Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.)

4.  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)

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Terminal

Signal name

Connected to

Measurement conditions

Voltage (V)

Inspection item (s)

A
Request switch signal
(RF)
Request switch (RF)
When request switch (RF) is pressed
1.0 or less
•  Request switch (RF)
•  LF control unit
―  Terminal B
•  Related wiring harness
When request switch (RF) is not pressed
5.0
B
Power supply
ROOM 15 A fuse
Under any condition
B+
•  ROOM 15 A fuse
•  Related wiring harness
C
Request switch signal
(LF)
Request switch (LF)
When request switch (LF) is pressed
1.0 or less
•  Request switch (LF)
•  LF control unit
―  Terminal B
•  Related wiring harness
When request switch (LF) is not pressed
5.0
D
E
Request switch signal
(liftgate)
Request switch (Liftgate)
When liftgate request switch is pressed
1.0 or less
•  LF control unit
―  Terminal B
•  Request switch (Liftgate)
•  Related wiring harness
When liftgate request switch is not pressed
5.0
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
•  Related wiring harness
•  Keyless beeper
•  Remote transmitter
•  LF control unit
―  Terminal B
Except above
1.0 or less
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
•  LF control unit
―  Terminal B
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
•  Related wiring harness
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, center)
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.


Inspection Using an Oscilloscope (Reference)

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•  LF control unit: H (+) ↔ body ground (-)
•  Oscilloscope setting: 2 V/DIV (Y), 100 ms/DIV (X), DC range