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SRS-4
PREPARATION
Revision: 2007 April2007 M35/M45
PREPARATIONPFP:00002
Commercial Service ToolsNHS0008R
Tool name Description
Tamper resistant TORX bit—
S-NT757
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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
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SRS
Revision: 2007 April2007 M35/M45
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)PFP:28556
SRS ConfigurationNHS0008S
The air bag deploys if the diagnosis sensor unit activates while the ignition switch is in the ON or START posi-
tion.
The collision modes for which supplemental restraint systems are activated are different among the SRS sys-
tems. For example, the driver air bag module and front passenger air bag module are activated in a frontal col-
lision but not in a side collision.
SRS configurations which are activated for some collision modes are as follows;
PHIA1120E
SRS configuration Frontal collision Left side collision Right side collision
Driver air bag module×——
Front passenger air bag module×——
Front LH seat belt pre-tensioner×——
Front RH seat belt pre-tensioner×——
Front LH side air bag module —×—
Front RH side air bag module — —×
LH side curtain air bag module —×—
RH side curtain air bag module — —×
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SRS-6
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
Revision: 2007 April2007 M35/M45
Front Seat Belt Pre-Tensioner with Load LimiterNHS0008T
The seat belt pre-tensioner system with load limiter is installed for
both the driver's seat and the front passenger's seat. It operates
simultaneously with the SRS air bag system in the event of a frontal
collision with an impact exceeding a specified level.
When the frontal collision with an impact exceeding a specified level
occurs, seat belt slack resulting from clothing or other factors is
immediately taken up by the pre-tensioner. Vehicle passengers are
securely restrained.
When passengers in a vehicle are thrown forward in a collision and
the restraining force of the seat belt exceeds a specified level, the
load limiter permits the specified extension of the seat belt by the
twisting of the ELR shaft, and a relaxation of the chest-area seat belt
web tension while maintaining force.
Front Side Air BagNHS0008U
Front side air bag is built-in type.
The front seatback with built-in type side air bag have the labels as
shown.
Side Curtain Air BagNHS0008V
The side curtain air bags have the labels as shown.
SRS444
SHIA0170E
BF-2006D
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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
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Revision: 2007 April2007 M35/M45
Occupant Classification System (OCS) NHS0008W
The occupant classification system identifies different size occupants, out of position occupants, and detects if
child seat is present in the front passenger seat. The occupant classification system receives inputs from the
occupant classification sensor (located inside the passenger seat cushion assembly) and belt tension sensor
(part of the passenger front seat belt assembly and located at the belt anchor location). Depending on classifi-
cation of passenger, the occupant classification system sends a signal to the diagnosis sensor unit. The diag-
nosis sensor unit uses this signal to determine full, partial, or non deployment of passenger front air bag in the
event of a collision. Depending on the signal received, the diagnosis sensor unit can disable the passenger
front air bag completely.
NOTE:
In case of customer concern, CONSULT-ll can be used to confirm the passenger air bag status (readiness).
Passenger Air Bag Status Condition NHS0008X
NOTE:
Passenger does not meet Ocuupant Classification System specifications for passenger air bag activation.
Component Parts of Occupant Classification System NHS0008Y
Front Passenger Seat
(Condition)PASS AIR BAG OFF Indicator
(Status)Passenger Air Bag Status
(Readiness)CONSULT-ll Display
Seat occupied OFF Active (enabled) ON
seat occupiedNOTE ON Deactivated (disabled) OFF
Seat empty OFF Deactivated (disabled) OFF
PHIA1177E
1.Occupant classification system con-
trol unit2. Belt tension sensor 3. Seat pressure sensor
4. Bladder 5.Front passenger air bag OFF indica-
tor (Cutoff telltaile)
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SRS-8
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
Revision: 2007 April2007 M35/M45
Passenger Seatbelt Warning System NHS0009R
SYSTEM DESCRIPTION
This system warns when passenger seatbelt is not fasten.
This system is composed of the following items.
Seatbelt warning lamp.
Seatbelt buckle switch (passenger side).
Air bag diagnosis sensor unit.
Occupant classification system.
Seatbelt warning lamp is used for both driver seatbelt warning and passenger seatbelt warning.
Seatbelt warning lamp turns ON when all conditions below are met.
Driver seatbelt is fastened.
Occupant is on passenger seat.
Passenger seatbelt is not fasten.
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TROUBLE DIAGNOSIS
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Revision: 2007 April2007 M35/M45
TROUBLE DIAGNOSISPFP:00004
Trouble Diagnosis IntroductionNHS00090
CAUTION:
Do not use electrical test equipment on any circuit related to the SRS unless instructed in this Ser-
vice Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or har-
ness connectors.
Do not repair, splice or modify the SRS wiring harness. If the harness is damaged, replace it with a
new one.
Keep ground portion clean.
DIAGNOSIS FUNCTION
The SRS self-diagnosis results can be read by using “AIR BAG” warning lamp and/or CONSULT-II.
The User mode is exclusively prepared for the customer (driver). This mode warns the driver of a system mal-
function through the operation of the “AIR BAG” warning lamp.
The Diagnosis mode allows the technician to locate and inspect the malfunctioning part.
The mode applications for the “AIR BAG” warning lamp and CONSULT-II are as follows:
HOW TO PERFORM TROUBLE DIAGNOSIS FOR QUICK AND ACCURATE REPAIR
A good understanding of the malfunction conditions can make troubleshooting faster and more accurate.
In general, each customer feels differently about a malfunction. It is important to fully understand the symp-
toms or conditions for a customer complaint.
Information from Customer
WHAT..... Vehicle model
WHEN..... Date, Frequencies
WHERE..... Road conditions
HOW..... Operating conditions, Symptoms
Preliminary Check
Make sure the following parts are in good order.
Battery (Refer to SC-4, "How to Handle Battery" .)
Fuse (Refer to SRS-13, "Wiring Diagram — SRS —" .)
System component-to-harness connections
User mode Diagnosis mode Display type
“AIR BAG” warning lamp X X ON-OFF operation
CONSULT-II — X Monitoring
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SRS-10
TROUBLE DIAGNOSIS
Revision: 2007 April2007 M35/M45
WORK FLOW
*1:SRS-9, "Preliminary Check".*2:SRS-20, "SRS Operation Check".*3:SRS-22, "DIAGNOSTIC PROCE-
DURE 2".
*4:SRS-35, "
DIAGNOSTIC PROCE-
DURE 6".*5:SRS-27, "
DIAGNOSTIC PROCE-
DURE 3".*6:SRS-35, "
DIAGNOSTIC PROCE-
DURE 6".
PHIA0217E
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TROUBLE DIAGNOSIS
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SRS
Revision: 2007 April2007 M35/M45
Component Parts LocationNHS00091
*: The bottom of front passenger seat
P H I A 111 0 E
1. Front passenger air bag module 2. Driver air bag module 3. Spiral cable
4. Diagnosis sensor unit 5. Side air bag (Satellite) sensor (RH/LH) 6. Front seat belt pre-tensioner (RH/LH)
7. Seat belt buckle switch (RH/LH) 8. Front side air bag modules 9. Side curtain air bag module
10. Crash zone sensor 11. Belt tension sensor 12. Belt tension sensor connector *
13. Seat pressure sensor * 14. Occupant classification system control unit *