1998 NISSAN PATROL warning

RESTRAINT SYSTEM
SECTION
RS
CONTENTS
PRECAUTION..................................................................1
Supplemental Restraint System (SRS) ``AIR
BAG'' and ``SEAT BELT PRE-TENSIONER''...............1
SEAT BELTS...................................................................2
Front Seat Belt.............................................................3
Rear Seat Belt .............................................................5
3rd Seat Belt ................................................................7
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)............8
Precautions for SRS ``AIR BAG'' and ``Seat Belt
Pre-tensioner'' Service.................................................8
Special Service Tools ..................................................8
Description .................................................................10
SRS Component Parts Location ...............................10
Maintenance Items .................................................... 11
Removal and Installation Ð Diagnosis Sensor
Unit and Seat Belt Pre-tensioner...............................12
Removal and Installation Ð Air Bag Module and
Spiral Cable ...............................................................13
Removal Ð Air Bag Module and Spiral Cable ..........13
Removal Ð Front Passenger Air Bag Module ..........14
Installation Ð Air Bag Module and Spiral Cable .......16Installation Ð Front Passenger Air Bag Module .......16
Disposal of Air Bag Module and Seat Belt Pre-
tensioner ....................................................................17
TROUBLE DIAGNOSES Ð Supplemental
Restraint System (SRS)...............................................22
Trouble Diagnoses Introduction.................................22
How to Perform Trouble Diagnoses for Quick
and Accurate Repair ..................................................24
Schematic ..................................................................26
Wiring Diagram Ð SRS Ð ........................................27
SRS Operation Check ...............................................30
Trouble Diagnoses with CONSULT ...........................32
Trouble Diagnoses without CONSULT ......................39
Trouble Diagnoses: ``AIR BAG'' Warning Lamp
Does Not Turn Off .....................................................43
Trouble Diagnoses: ``AIR BAG'' Warning Lamp
Does Not Turn On .....................................................43
Trouble Diagnoses: SRS Does Not Enter
Diagnosis Mode Using Door Switch ..........................44
COLLISION DIAGNOSIS...............................................45
When you read wiring diagrams:
+Read GI section, ``HOW TO READ WIRING DIAGRAMS''.
+See EL section, ``POWER SUPPLY ROUTING'' for power distribution circuit.
When you perform trouble diagnoses, read GI section, ``HOW TO FOLLOW FLOW
CHART IN TROUBLE DIAGNOSES'' and ``HOW TO PERFORM EFFICIENT DIAGNOSIS
FOR AN ELECTRICAL INCIDENT''.
RS

Supplemental Restraint System (SRS) ``AIR
BAG'' and ``SEAT BELT PRE-TENSIONER''
The Supplemental Restraint System such as ``AIR BAG'' and ``SEAT BELT PRE-TENSIONER'' used along with
a seat belt, helps to reduce the risk or severity of injury to the driver and front passenger in a frontal collision.
The SRS composition which is available to NISSAN MODEL Y61 is as follows (The composition varies
according to the destination.):
Driver air bag module (located in the center of the steering wheel), front passenger air bag module (located
on the instrument panel on passenger side), seat belt pre-tensioner, a diagnosis sensor unit, warning lamp,
wiring harness and spiral cable.
WARNING:
+To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death
in the event of a collision which would result in air bag in¯ation, all maintenance must be performed
by an authorized NISSAN dealer.
+Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal injury caused by unintentional activation of the system.
+Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. Spiral cable and wiring harnesses covered with yellow insulation either just before
the harness connectors or for the complete harness are related to the SRS.
PRECAUTION
RS-1

Maintenance Items
CAUTION:
Do not use a circuit tester to check SRS circuit.
1. Check operation of ``AIR BAG'' warning lamp.
After turning ignition key to ``ON'' position, both warning lamps
illuminate. The ``AIR BAG'' warning lamp will go off after about
7 seconds if no malfunction is detected.
If any of the following warning lamp conditions occur, immedi-
ately check the air bag or seat belt pre-tensioner system. Refer
to RS-30 for details.
+The ``AIR BAG'' warning lamp does not illuminate when the
ignition switch is turned ``ON''.
+The ``AIR BAG'' warning lamp does not go off about 7 seconds
after the ignition switch is turned ``ON''.
+The ``AIR BAG'' warning lamp blinks about 7 seconds after the
ignition switch is turned ``ON''.
2. Visually check SRS components.
(1) Diagnosis sensor unit
+Check diagnosis sensor unit and bracket for dents, cracks or
deformities.
+Check connectors for damage, and terminals for deformities.
(2) Air bag module and steering wheel
+Remove air bag module from steering wheel or instrument
panel. Check harness cover and connectors for damage, ter-
minals for deformities, and harness for binding.
+Install driver air bag module to steering wheel to check ®t or
alignment with the wheel.
+Check steering wheel for excessive free play.
+For dual air bag system, install passenger air bag module to
instrument panel to check ®t or alignment with the instrument
panel.
(3) Spiral cable
+Check spiral cable for dents, cracks, or deformities.
+Check connectors and protective tape for damage.
+Check steering wheel for noise, binding or heavy operation.
(4) Harness related to SRS
+Check connectors for poor connections, damage, and terminals
for deformities.
+Check harnesses for binding, cha®ng or cut.
(5) Seat belt pre-tensioner
+Check harness cover and connectors for damage, terminals for
deformities, and harness for binding.
+Check belts for damage and anchors for loose mounting.
+Check retractor for smooth operation.
+Perform self-diagnosis for seat belt pre-tensioner using
bulb or CONSULT. Refer to ``SRS Operation Check'' for details.
(RS-30)
CAUTION:
Replace previously used special bolts, ground bolt and anchor
bolt with new ones.
SRS451
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
RS-11

Installation Ð Air Bag Module and Spiral Cable
1. Set the front wheels in the straight-ahead position.
2. Make sure that the spiral cable is in the neutral position. The
neutral position is detected by turning left about 2.5 revolutions
from the right end position. Align the two marks (
,
m).
CAUTION:
+The spiral cable may snap due to steering operation if the
cable is installed in an improper position.
+Also, with the steering linkage disconnected, the cable
may snap by turning the steering wheel beyond the limited
number of turns. The spiral cable can be turned to the left
about 2.5 turns from the right end position.
3. Connect and lock spiral cable connector and tighten with
screws. Install steering column cover.
4. Install steering wheel, aligning with spiral cable pin guides, and
pull spiral cable through.
5. Connect horn connector and engage spiral cable with pawls in
steering wheel. Move air bag module connector away from
steering wheel lower lid opening.
6. Tighten nut.
:29-39Nzm (3.0 - 4.0 kg-m, 22 - 29 ft-lb)
7. Position air bag module and tighten with new special bolts.
8. Connect air bag module connector.
9. Install all lids.
10. Conduct self-diagnosis to ensure entire SRS operates properly.
(Use CONSULT or warning lamp check.)
Before performing self-diagnosis, connect both battery cables.
11. Turn steering wheel to the left end and then to the right end fully
to make sure that spiral cable is set in the neutral position.
If air bag warning lamp blinks or stays ON (at the User mode),
it shows the spiral cable may be snapped due to its improper
position. Perform self-diagnosis again (use CONSULT or warn-
ing lamp). If a malfunction is detected, replace the spiral cable
with a new one.
12. Perform self-diagnosis again to check that no malfunction is
detected.
Installation Ð Front Passenger Air Bag Module
+Always work from the side of air bag module.
1. Install front passenger air bag module on steering member.
+Ensure harness is not caught between rear of air bag module
and steering member.
2. Connect in¯ator connector to body harness connector.
3. Install in¯ator connector on steering member.
SRS276
SRS166
SBF812EB
SRS457
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
RS-16

Trouble Diagnoses Introduction
CAUTION:
+Do not use a circuit tester to check SRS harness connectors unless instructed to in this Service
Manual. SRS wiring harnesses except for ``SEAT BELT PRE-TENSIONER'' can be identi®ed with
yellow harness protector or yellow insulation tape before the harness connectors.
+Do not attempt to 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.
System Using CONSULT Using warning lamp
Seat belt pre-tensioner X Ð
Air bag Driver air bag X X
Front passenger air bag X X
The reading of these results is accomplished using one of two modes Ð ``User mode'' and ``Diagnosis mode''.
The User mode is exclusively prepared for the customer (driver). This mode warns the driver of a system
malfunction 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 are as follows:
User mode Diagnosis mode Display type
``AIR BAG'' warning lamp X X ON-OFF operation
CONSULT Ð X Monitoring
DIAGNOSIS MODE FOR CONSULT
+``SELF-DIAG [CURRENT]''
A current Self-diagnosis result (also indicated by the warning lamp ¯ashes in the Diagnosis mode) is dis-
played on the CONSULT screen in real time. This refers to a malfunctioning part requiring repairs.
+``SELF-DIAG [PAST]''
Diagnosis results previously stored in the memory are displayed on the CONSULT screen. The stored
results are not erased until memory erasing is executed.
+``TROUBLE DIAG RECORD''
With ``TROUBLE DIAG RECORD'', diagnosis results previously erased by a reset operation can be dis-
played on the CONSULT screen.
+``ECU DISCRIMINATED NO.''
The diagnosis sensor unit for each vehicle model is assigned
with its own, individual classi®cation number. This number will
be displayed on the CONSULT screen, as shown at left. When
replacing the diagnosis sensor unit, refer to the part number for
the compatibility. After installation, replacement with a correct
unit can be checked by con®rming this classi®cation number on
the CONSULT screen.
For NISSAN MODEL Y61, the diagnosis sensor unit classi®ca-
tion numbers assigned are C2 (Hardtop models) and 27 (Mod-
els except Hardtop).
SRS504
TROUBLE DIAGNOSES Ð Supplemental Restraint System (SRS)
RS-22

HOW TO ERASE SELF-DIAGNOSIS RESULTS
With CONSULT
+``SELF-DIAG [CURRENT]''
A current Self-diagnosis result is displayed on the CONSULT screen in real time. After the malfunction is
repaired completely, no malfunction is detected on ``SELF-DIAG [CURRENT]''.
+``SELF-DIAG [PAST]''
Return to the ``SELF-DIAG [CURRENT]'' CONSULT screen by
pushing ``BACK'' key of CONSULT and select ``SELF-DIAG
[CURRENT]'' in ``SELECT DIAG MODE''. Touch ``ERASE'' in
``SELF-DIAG [CURRENT]'' mode.
NOTE:
If the memory of the malfunction in ``SELF-DIAG [PAST]'' is not
erased, the User mode shows the system malfunction by the
operation of the warning lamp even if the malfunction is
repaired completely.
+``TROUBLE DIAG RECORD''
The memory of ``TROUBLE DIAG RECORD'' cannot be erased.
Without CONSULT
After a malfunction is repaired, return to User mode from Diagnosis mode by switching the ignition ``OFF'' for
at least 1 second, then back ``ON''. At that time, the problem code is cleared.
How to Perform Trouble Diagnoses 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 problem. It is important to fully understand the symptoms
or conditions for a customer complaint.
INFORMATION FROM CUSTOMER
WHAT ............ Vehicle model
WHEN ........... Date, Frequencies
WHERE ......... Road conditions
HOW .............. Operating conditions, Symptoms
PRELIMINARY CHECK
Check that the following parts are in good order.
+Battery [Refer to EL section (``BATTERY'').]
+Fuse [Refer to EL section (``Fuse'', ``POWER SUPPLY ROUTING'').]
+System component-to-harness connections
SRS357
TROUBLE DIAGNOSES Ð Supplemental Restraint System (SRS)
Trouble Diagnoses Introduction (Cont'd)
RS-24

WORK FLOW
ACTION ITEMREFERENCE ITEM
Check in
Listen to customer complaints and requests.
Perform preliminary check.bPreliminary check (RS-24)
Check for any Service Bulletin.
Check air bag system operation by using ``AIR BAG'' warning lamp.
Ð User mode
Check seat belt pre-tensioner system operation by using a bulb.bSRS Operation Check
DIAGNOSTIC PROCEDURE 1
(RS-30)
cInspect malfunctioning part. Ð Diagnosis mode
Perform self-diagnosis using CONSULT.
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------OR ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Perform self-diagnosis using ``AIR BAG'' warning lamp.bDIAGNOSTIC PROCEDURE 2:
Using CONSULT (RS-32)
DIAGNOSTIC PROCEDURE 6:
Using ``AIR BAG'' warning lamp
(RS-39)
Repair/Replace
NGFinal check Ð Diagnosis mode and User mode
CONSULT can only show one seat belt pre-tensioner malfunction as
self-diagnosis result at a time. Check self-diagnosis result with CON-
SULT whether other malfunctions are detected after repairing one
seat belt pre-tensioner malfunction.
OK
bDIAGNOSTIC PROCEDURE 3:
Using CONSULT (RS-34)
DIAGNOSTIC PROCEDURE 7:
Using ``AIR BAG'' warning lamp
(RS-40)
Check out
.
.
.
.
.
.
.
.
TROUBLE DIAGNOSES Ð Supplemental Restraint System (SRS)
How to Perform Trouble Diagnoses for Quick
and Accurate Repair (Cont'd)
RS-25

SRS Operation Check
DIAGNOSTIC PROCEDURE 1
Checking SRS operation by using ``AIR BAG'' warning lamp Ð
User mode
1. After turning ignition switch from ``OFF'' to ``ON'', ``AIR BAG''
warning lamp operates.
2. Compare ``AIR BAG'' warning lamp operation to the chart
below.
``AIR BAG'' warning lamp operation Ð User mode Ð SRS condition Reference item
MRS095A
No malfunction is
detected. No further action
is necessary.
Ð
MRS096A
The system has problem
and needs to be repaired
as indicated.Go to DIAGNOSTIC
PROCEDURE 2 or 6
(RS-32 or RS-39).
MRS097A
Air bag is deployed. Go to COLLISION
DIAGNOSIS (RS-45).
Air bag fuse, diagnosis
sensor unit or harness is
malfunctioning and needs
to be repaired.Go to DIAGNOSTIC
PROCEDURE 9 (RS-43).
MRS098A
One of the following has
occurred and needs to be
repaired.
+Meter fuse is blown.
+``AIR BAG'' warning
lamp circuit has open or
short.
+Diagnosis sensor unit is
malfunctioning.Go to DIAGNOSTIC
PROCEDURE 10 (RS-43).
NOTE:
If ``AIR BAG'' warning lamp operates differently from the
operations shown above, refer to ``AIR BAG'' warning lamp
operation Ð Diagnosis mode Ð,DIAGNOSTIC PROCEDURE 6
(step 4), RS-39.
SRS466
TROUBLE DIAGNOSES Ð Supplemental Restraint System (SRS)
RS-30