LF CONTROL UNIT INSPECTION

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1.  Remove the front scuff plate (RH). (See FRONT SCUFF PLATE REMOVAL/INSTALLATION.)

2.  Remove the front side trim (RH). (See FRONT SIDE TRIM REMOVAL/INSTALLATION.)

3.  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) and related wiring harnesses.
―  If the system does not work normally even though the inspection items or related wiring harnesses do not have any malfunction, 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)
When request switch (RF) is not pressed
5.0
B
Power supply
INTERIOR 15 A fuse
Under any condition
B+
•  ROOM 25A fuse
•  INTERIOR 15 A fuse
•  Battery
•  DC-DC converter*1
C
Request switch signal (LF)
Request switch (LF)
When request switch (LF) is pressed
1.0 or less
•  Request switch (LF)
When request switch (LF) is not pressed
5.0
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 or front door request switch is pressed to lock
Wave pattern (See Pattern 1.)
•  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
GROUND
Keyless beeper
Under any condition
1.0 or less
•  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.
O
Keyless antenna (exterior, LF)
Keyless antenna (exterior, LF)
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.
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.

*1  :WIth i-ELOOP

Inspection Using an Oscilloscope (Reference)


Pattern 1

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