Infiniti G37 Coupe. Manual — part 1080
SBC-28
< COMPONENT DIAGNOSIS >
PRE-CRASH SEAT BELT CONTROL UNIT GROUND CIRCUIT CHECK
PRE-CRASH SEAT BELT CONTROL UNIT GROUND CIRCUIT CHECK
Description
INFOID:0000000001712005
• The pre-crash seat belt control unit controls the pre-crash seat belt motor according to the input signal.
• When the control unit judges the emergency braking operation and the intelligent brake assistance operating
status, it gives the sense of security by the motor built into the pre-crash seat belt motor retracting the shoul-
der belt and suppressing the crew's posture change. Or, it eases the damage of the collision.
• It is installed on the back of the glove box.
Component Function Check
INFOID:0000000001712006
1.
CHECK PRE-CRASH SEAT BELT CONTROL UNIT GROUND CIRCUIT
1.
Turn the ignition switch OFF.
2.
Disconnect the pre-crash seat belt control unit connector.
3.
Check that continuity between pre-crash seat belt control unit harness connector terminals 5, 26 and
ground is normal.
Is the inspection result normal?
YES
>> Ground system is normal.
NO
>> Repair or replace harness between pre-crash seat belt control unit and ground.
5 - Ground
Existed
26 - Ground
Existed
PRE-CRASH SEAT BELT CONTROL UNIT
SBC-29
< ECU DIAGNOSIS >
C
D
E
F
G
I
J
K
L
M
A
B
SBC
N
O
P
ECU DIAGNOSIS
PRE-CRASH SEAT BELT CONTROL UNIT
Reference Value
INFOID:0000000001712010
VALUES ON THE DIAGNOSIS TOOL
CONSULT-III MONITOR ITEM
TERMINAL LAYOUT
PHYSICAL VALUES
Monitor item
Condition
Value/Status
(Approx)
B PEDAL SENS SIG1
B PEDAL SENS SIG2
Brake released
Brake released
(1V)
(4V)
B PEDAL SENS SIG1
B PEDAL SENS SIG2
Brake released
→
depressed
Brake released
→
depressed
(1V
→
4V)
(4V
→
1V)
RH BUCKLE SW
RH seat belt is not fastened
RH seat belt is fastened
OFF
ON
LH BUCKLE SW
LH seat belt is not fastened
LH seat belt is fastened
OFF
ON
JMHIA0181ZZ
Terminal No.
Wire col-
or
Description
Condition
Value (*1)
(Approx)
+
–
Signal name
Input/
Output
1
GND
G/R
RH seat belt motor release signal
Output
—
—
2
GND
W
Drive circuit power supply (+BAT)
Input
Seat belt motor non-operational
BAT
3
GND
G/Y
RH seat belt motor forward (retract)
signal
Output
—
—
4
GND
GR/W
LH seat belt motor forward (retract)
signal
Output
—
—
5
GND
W
Drive circuit ground
—
Always
GND
6
GND
LY
LH seat belt motor release signal
Output
—
—
7
GND
G
Indicator (seat belt warning lamp)
Output
LH seat belt is not fastened
GND
LH seat belt is fastened
BAT
LH seat belt is fastened or malfunc-
tion of system
BAT
←→
GND
(0.5sec)
8
GND
LG
RH seat belt buckle switch signal
Input
RH seat belt is fastened
BAT
RH seat belt is not fastened
GND
10
GND
SB
LH seat belt buckle switch signal
Input
LH seat belt is fastened
OPEN
LH seat belt is not fastened
GND
SBC-30
< ECU DIAGNOSIS >
PRE-CRASH SEAT BELT CONTROL UNIT
*1: Perform the measurement while connecting the control unit and the harness.
*2: The value may be changed according to the brake pedal depressed amount.
Fail Safe
INFOID:0000000001712011
When a malfunction occurs in the following system, the pre-crash seat belt function is controlled according to
the malfunctioning parts.
DTC Index
INFOID:0000000001712012
DISPLAY ITEM LIST (PRE-CRASH SEAT BELT)
13
GND
W
Control circuit power supply (IGN)
Input
IGN ON
BAT
IGN OFF
GND
16
GND
W
Brake pedal stroke sensor signal1
Input
IGN ON
(1
→
4V) *2
IGN OFF
0V
18
GND
R
Brake pedal stroke sensor power cir-
cuit
Output
IGN ON
5V
IGN OFF
0V
20
GND
G
Brake pedal stroke sensor signal2
Input
IGN ON
(4
→
1V) *2
IGN OFF
0V
21
GND
B
Brake pedal stroke sensor ground
circuit
—
Always
GND
22
GND
P
CAN communication signal (CAN L-
line)
Input/
Output
—
—
24
GND
L
CAN communication signal (CAN H-
line)
Input/
Output
—
—
25
GND
SHIELD
Shield ground
—
Always
GND
26
GND
B
Control circuit ground
—
Always
GND
Terminal No.
Wire col-
or
Description
Condition
Value (*1)
(Approx)
+
–
Signal name
Input/
Output
Display contents of CONSULT-III
Fail-safe
Cancellation
B2451: SB MOTOR RH CIRC
Deactivate the RH pre-crash seat belt function
Erase DTC
B2452: SB MOTOR LH CIRC
Deactivate the LH pre-crash seat belt function
Erace DTC
B2453: BR STROK SEN CIRC
Deactivate the interlock function during emergency
brake operation
Erace DTC
B2454: MOTOR PWR SUP CIRC
Deactivate the pre-crash seat belt function
Erace DTC
DTC
Trouble diagnosis name
(CONSULT-III display)
DTC detection condition
Reference
—
—
No malfunction is detected
—
U1000
CAN COMM CIRCUIT
Pre-crash seat belt control unit cannot transmit and receive CAN
communication signal for 2 seconds or more
B2451
SB MOTOR RH CIRC
RH seat belt motor circuit is shorted or open
B2452
SB MOTOR LH CIRC
LH seat belt motor circuit is shorted or open
B2453
BR STROK SEN CIRC
Brake pedal stroke sensor circuit is shorted or open
B2454
MOTOR PWR SUP CIRC
Motor power supply circuit is shorted or open
CAUTION:
Malfunction is judged when 30A (F/L-G) fusible link blows out
even if motor power supply circuit is not malfunctioning.
B2455
PSB C/U INT CIRCUIT
Internal breakdown in pre-crash seat belt control unit
PRE-CRASH SEAT BELT CONTROL UNIT
SBC-31
< ECU DIAGNOSIS >
C
D
E
F
G
I
J
K
L
M
A
B
SBC
N
O
P
Wiring Diagram - SEAT BELT CONTROL SYSTEM -
INFOID:0000000001712013
JCHWA0096GB
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