BRAKE LIGHT UNIT INSPECTION

id091800400100

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

2.  Remove the following parts.

1.  Tonneau cover (with tonneau cover) (See TONNEAU COVER REMOVAL/INSTALLATION.)
2.  Trunk board (See TRUNK BOARD REMOVAL/INSTALLATION.)
3.  Bass-box (with Bose®) (See BASS-BOX REMOVAL/INSTALLATION.)
4.  Sub-trunk (See SUB-TRUNK REMOVAL/INSTALLATION.)
5.  Trunk end trim (See TRUNK END TRIM REMOVAL/INSTALLATION.)
6.  Rear scuff plate (LH) (See REAR SCUFF PLATE REMOVAL/INSTALLATION.)
7.  Trunk side trim (LH) (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 or related wiring harnesses do not have any malfunction, replace the brake light unit. (See BRAKE LIGHT UNIT REMOVAL/INSTALLATION.)

Terminal voltage list (reference)

ac9uuw00007123

Terminal

Signal

Connection

Test condition

Voltage (V)

Inspection item(s)
A
Ground
Body ground
Under any condition
1.0 or less
Body ground
B
—
—
—
—
—
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.
F
Power supply
STOP 10 A fuse
Under any condition
B+
•  STOP 10 A fuse
•  Battery
G
High-mount brake light signal
High-mount brake light
Brake pedal depressed
B+
High-mount brake light
Brake pedal not depressed
1.0 or less
H
Brake light illumination status signal
DSC HU/CM
Brake pedal depressed
B+
DSC HU/CM
Brake pedal not depressed
1.0 or less
I
Brake switch (No.1 signal) signal
Brake switch (No.1 signal)
Brake pedal depressed
B+
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
•  Rear body control module (RBCM)
Brake pedal not depressed
1.0 or less