BRAKE LIGHT UNIT INSPECTION


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

2.  Remove the following parts.

1.  Rear scuff plate (LH) (See REAR SCUFF PLATE REMOVAL/INSTALLATION.)
2.  Trunk board (See TRUNK BOARD REMOVAL/INSTALLATION.)
3.  Trunk side pocket (See TRUNK SIDE POCKET REMOVAL/INSTALLATION.)
4.  Trunk end trim (See TRUNK END TRIM REMOVAL/INSTALLATION.)
5.  Bass-box (with Bose®) (See BASS-BOX REMOVAL/INSTALLATION.)
6.  Third-row seat cushion (See THIRD-ROW SEAT CUSHION REMOVAL/INSTALLATION.)
7.  Third-row seat back component (See THIRD-ROW SEAT BACK COMPONENT REMOVAL/INSTALLATION.)
8.  Trunk side trim (See TRUNK SIDE TRIM REMOVAL/INSTALLATION.)

3.  Reconnect 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.

•  If the voltage is not as indicated in the table, inspect the parts under Inspection item (s).
―  If the system does not work normally even though the parts do not have any malfunction, replace the brake light unit. (See BRAKE LIGHT UNIT REMOVAL/INSTALLATION.)

Terminal voltage list (reference)

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Terminal

Signal

Connection

Test condition

Voltage (V)

Inspection item(s)

A
Ground
Body ground
Under any condition
1.0 or less
•  Body ground
•  Related wiring harness
B
C
D
Brake light illumination request signal
Rear body control module (RBCM)
Because this terminal is for communication, integrity determination by terminal voltage is not possible.
E
F
Power supply
•  STOP 10 A fuse
•  Brake switch (No.1 signal)
Under any condition
B+
•  STOP 10 A fuse
•  Related wiring harness
G
High-mount brake light signal
High-mount brake light
Brake pedal depressed
B+
•  Brake light unit
―  Terminal I
•  Related wiring harness
Brake pedal not depressed
1.0 or less
H
Brake light illumination status signal
DSC HU/CM
Brake pedal depressed
B+
•  Brake light unit
―  Terminal I
•  Related wiring harness
Brake pedal not depressed
1.0 or less
I
Brake switch (No.1 signal) signal
•  Brake switch (No.1 signal)
•  Start stop unit
•  Rear body control module (RBCM)
Brake pedal depressed
B+
•  STOP 10 A fuse
•  Brake switch (No.1 signal)
Brake pedal not depressed
1.0 or less
J
Brake light signal
•  Brake light
•  Rear body control module (RBCM)
Brake pedal depressed
B+
•  Brake light unit
―  Terminal I
•  Related wiring harness
Brake pedal not depressed
1.0 or less