LF CONTROL UNIT INSPECTION


id091400110600

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.


Terminal voltage table (reference)

ac9wzw00004959

Terminal

Signal name

Connected to

Measurement conditions

Voltage (V)

Inspection item (s)

A
Request switch signal
(RF)
Request switch (RF)
When passenger's side request switch is pressed
1.0 or less
•  Front outer handle (passenger's side)
•  Related wiring harness
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
(LF)
Request switch (LF)
When driver's side request switch is pressed
1.0 or less
•  Front outer handle (driver's side)
•  Related wiring harness
When driver's side request switch is not pressed
5.0
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
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
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
•  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, 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