ras INFINITI M35 2007 Factory Service Manual

SB-4
PRE-CRASH SEAT BELT
Revision: 2007 April2007 M35/M45
FUNCTION DESCRIPTION
Operation condition
Pre-crash seat belt operates under the following conditions.
Operation prohibition condition
If operation condition is satisfied, pre-crash seat belt does not operate under the following conditions.
*1 : When pre-crash seat belt doesn't operate after it continuously operates 3 times or more, operation can be performed again by stop-
ping operation for approximately 7 minutes.
*
2 : Refer to SB-4, "FAIL-SAFE MODE" for details of fail-safe mode.
FAIL-SAFE MODE
When a malfunction occurs in the following system, the pre-crash seat belt function is controlled according to
the malfunctioning parts.
Also, seat belt warning lamp blinks with fastening driver seat belt when the following malfunction occurs.
Seat Belt Warning Lamp Illumination Pattern
NOTE:
The seat belt warning lamp illumination system shown above operates only when the air bag system does not
turn on the seat belt warning lamp. The air bag system turns on the seat belt warning lamp, depending on the
conditions of passenger being on and the passenger seat belt fastening.
Condition
When the brake pedal is depressed more than a certain extent

When operation prohibition condition is not satisfied
Condition

When seat belt is not fastened (Only the seat belt that is not fastened does not operate.)

When vehicle is moving backwards

When the vehicle speed is 15 km/h (9 MPH) or less

When pre-crash seat belt continuously operates 3 times or more *1

At fail-safe condition *2
Malfunctioning parts Control contents
Brake pedal stroke sensor system malfunction Pre-crash seat belt RH/LH do not activate when emergency brake operates.
Seat belt motor RH malfunction Pre-crash seat belt RH does not activate.
Seat belt motor LH malfunction Pre-crash seat belt LH does not activate.
Motor power supply circuit malfunction Pre-crash seat belt RH/LH do not activate.
PHIA1142E

PRE-CRASH SEAT BELT
SB-5
C
D
E
F
G
I
J
K
L
MA
B
SB
Revision: 2007 April2007 M35/M45
CAN Communication System DescriptionNHS0007Z
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during operation (not independent). In CAN communication, control units are connected with 2
communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads required data only.
CAN Communication UnitNHS00080
Refer to LAN-50, "CAN System Specification Chart" .

SB-6
PRE-CRASH SEAT BELT
Revision: 2007 April2007 M35/M45
SchematicNHS00081
THWT0139E

PRE-CRASH SEAT BELT
SB-7
C
D
E
F
G
I
J
K
L
MA
B
SB
Revision: 2007 April2007 M35/M45
Wiring Diagram — PSB —NHS00082
THWT0140E

SB-8
PRE-CRASH SEAT BELT
Revision: 2007 April2007 M35/M45
THWT0240E

PRE-CRASH SEAT BELT
SB-9
C
D
E
F
G
I
J
K
L
MA
B
SB
Revision: 2007 April2007 M35/M45
THWT0142E

SB-10
PRE-CRASH SEAT BELT
Revision: 2007 April2007 M35/M45
THWT0241E

PRE-CRASH SEAT BELT
SB-11
C
D
E
F
G
I
J
K
L
MA
B
SB
Revision: 2007 April2007 M35/M45
THWT0242E

SB-12
PRE-CRASH SEAT BELT
Revision: 2007 April2007 M35/M45
THWT0205E

PRE-CRASH SEAT BELT
SB-13
C
D
E
F
G
I
J
K
L
MA
B
SB
Revision: 2007 April2007 M35/M45
Terminals and Reference Value for Pre-Crash Seat Belt Control UnitNHS00083
Work FlowNHS00084
1. Check the symptom and customer's requests.
2. Understand the system description. Refer to SB-3, "
System Description" .
3. Perform the preliminary check. Refer to SB-15, "
Preliminary Check" .
4. Check the self-diagnosis, results using CONSULT-II. Refer to SB-14, "
CONSULT-II Function (PRECRASH
SEATBELT)" .
5. Based on the trouble diagnosis chart, repair or replace the cause of the malfunction. Refer to SB-15,
"Diagnoses Symptom Chart" .
6. Does pre-crash seat belt system operate normally?
OK: GO TO 7.
NG: GO TO 4.
7. INSPECTION END
TerminalWire
ColorItemSignal
Input/OutputConditionVo l ta g e [V ]
(Approx.)
1G/RSeat belt motor RH release
direction signalOutputSeat belt motor RH operation Battery voltage
Other than above 0
2 W Power source (BAT) Input — Battery voltage
3G/YSeat belt motor RH fastened
direction signalOutputSeat belt motor RH operation Battery voltage
Other than above 0
4GY/WSeat belt motor LH fastened
direction signalOutputSeat belt motor LH operation Battery voltage
Other than above 0
5 B/Y Ground (Driver circuit) — — 0
6L/YSeat belt motor LH release
direction signalOutputSeat belt motor LH operation Battery voltage
Other than above 0
7 G/Y Seat belt indicator signal OutputWhen driver side seat belt is fastened Battery voltage
When driver side seat belt is un-fastened 0
When driver side seat belt is fastened and
system malfunctionBattery
voltage ⇔ 0
8 LG Seat belt buckle switch RH InputWhen seat belt is fastened 5
When seat belt is un-fastened 0
10 SB Seat belt buckle switch LH InputWhen seat belt is fastened Battery voltage
When seat belt is un-fastened 0
13 W/G Power source (IGN) Input Ignition switch ON or START Battery voltage
16 WBrake pedal stroke sensor
output signal 1OutputBrake pedal is fully released operation 1
Brake pedal is slightly depressed operation 4
18 RPower source
(Brake pedal stroke sensor)Input — 5
20 GBrake pedal stroke sensor
output signal 2OutputBrake pedal is fully released operation 4
Brake pedal is slightly depressed operation 1
21 BGround
(Brake pedal stroke sensor)—— 0
22 P CAN-L Input/Output — —
24 L CAN-H Input/Output — —
25 — Ground (Shield wire) — — 0
26 B/Y Ground (Control circuit) — — 0