sensor NISSAN PATROL 2000 Electronic Repair Manual

Maintenance Items
CAUTION:
Do not use electrical test equipment to check SRS circuit.
1. Check operation of ªAIR BAGº and ªSEAT BELTº warning
lamps (ªSEAT BELTº warning lamp can be used for check-
ing seat belt pre-tensioner on models except for Europe.).
After turning ignition key to ªONº position, both warning
lamps illuminate. The ªAIR BAGº warning lamp will go off
after about 7 seconds if no malfunction is detected. The
ªSEAT BELTº warning lamp will also go off after about 7
seconds after seat belt has been fastened and no malfunc-
tion is detected. (When seat belt has not been fastened, the
warning lamp continues to illuminate until seat belt is fas-
tened.)
If any of the following warning lamp conditions occur, imme-
diately check the air bag or seat belt pre-tensioner system.
Refer to RS-1032 for details.
+The ªAIR BAGº or ªSEAT BELTº warning lamp does not illu-
minate when the ignition switch is turned ªONº.
+The ªAIR BAGº or ªSEAT BELTº (with seat belt fastened)
warning lamp does not go off about 7 seconds after the igni-
tion switch is turned ªONº.
+The ªAIR BAGº or ªSEAT BELTº (with seat belt fastened)
warning lamp blinks after about 7 seconds after the ignition
switch is turned ªONº.
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, instrument
panel or seat back. Check harness cover and connectors for
damage, terminals for deformities, and harness for binding.
+Install driver air bag module to steering wheel to check fit or
alignment with the wheel.
+Check steering wheel for excessive free play.
+Install passenger air bag module to instrument panel to
check fit or alignment with the instrument panel.
+Install side air bag module to seat back to check fit and
alignment with the seat.
(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) Main harness and body harness
+Check connectors for poor connections, damage, and termi-
nals for deformities.
+Check harnesses for binding, chafing 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.
SRS222-B
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
RS-1006

+Perform self-diagnosis for seat belt pre-tensioner using seat
belt warning lamp or CONSULT-II. Refer to ªSelf-diagnosisº
for details.
(6) Satellite sensor
+Check satellite sensor (including bracket portion) for dents,
cracks or deformities.
+Check connectors for damage, and terminals for deformities.
CAUTION:
Replace previously used special bolts, ground bolt and nuts
coated with bonding agent.
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
Maintenance Items (Cont'd)
RS-1007

Removal and Installation Ð Diagnosis
Sensor Unit, Seat Belt Pre-tensioner with
Load Limiter and Satellite Sensor
CAUTION:
+Before servicing SRS, turn the ignition switch off, disconnect both battery cables and wait at least
3 minutes.
+Do not use old bolts and nuts coated with bonding agent after removal; replace with new ones.
+Check diagnosis sensor unit, seat belt pre-tensioner with load limiter and satellite sensor for
proper installation.
+Check diagnosis sensor unit and satellite sensor to ensure they are free of deformities, dents,
cracks or rust. If they show any visible signs of damage, replace them with new ones.
+Check diagnosis sensor unit brackets to ensure they are free of deformities and rust.
+After replacement of diagnosis sensor unit, seat belt pre-tensioner and satellite sensor, check
SRS function and perform self-diagnosis for SRS. Refer to ªSelf-diagnosisº for details. (RS-1032)
+Do not attempt to disassemble diagnosis sensor unit, seat belt pre-tensioner with load limiter and
satellite sensor.
+Replace diagnosis sensor unit, seat belt pre-tensioner and satellite sensor if it has been dropped
or sustained an impact.
+Do not expose seat belt pre-tensioner to temperatures exceeding 80ÉC (176ÉF).
REMOVAL OF DIAGNOSIS SENSOR UNIT
1. Disconnect driver, passenger and side air bag module con-
nectors. Also, disconnect seat belt pre-tensioner connector.
2. Remove console finisher, console box assembly and instru-
ment panel stay cover. Refer to ªINSTRUMENT PANELº in
BT section.
3. Disconnect diagnosis sensor unit connector.
4. Remove bolt and also remove special bolts using the
TAMPER RESISTANT TORX (Size T50), from diagnosis
sensor unit.
Then remove the diagnosis sensor unit.
NOTE:
+To install, reverse the removal procedure sequence.
+After replacement, perform self-diagnosis for SRS. Refer
to ªSelf-diagnosisº for details (RS-1032).
CAUTION:
+Do not use old special bolts coated with bonding agent;
replace with new coated special bolts.
SRS757
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
RS-1008

REMOVAL OF SATELLITE SENSOR
1. Remove seat belt pre-tensioner with load limiter or seat belt
retractor. Refer to ªREMOVAL OF SEAT BELT PRE-TEN-
SIONER WITH LOAD LIMITERº or ªFront seat beltº in RS
section of Service Manual (Pub. No. SM7E-2Y61G0 or
SM7E-2Y61G1) for details.
2. Disconnect satellite sensor connector.
3. Remove bolt and nuts coated with bonding agent from sat-
ellite sensor unit.
Then remove the satellite sensor.
NOTE:
+To install, reverse the removal procedure sequence.
CAUTION:
+Do not use old nuts coated with bonding agent after
removal; replace with new coated nuts.
Removal Ð Driver Air Bag Module and Spiral
Cable
SRS758
SRS759-A
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
Removal and Installation Ð Diagnosis
Sensor Unit, Seat Belt Pre-tensioner with
Load Limiter and Satellite Sensor (Cont'd)
RS-1009

Trouble Diagnoses Introduction
CAUTION:
+Do not use electrical test equipment to check SRS harness connectors unless instructed to in
this Service Manual. SRS wiring harnesses can be identified by yellow harness protector or yel-
low 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 ªAIR BAGº warning lamp, ªSEAT BELTº warning lamp
(Models except for Europe) and/or CONSULT-II. The reading of these results is accomplished using one of
two modes Ð ªUser modeº and ªDiagnosis modeº.
The User mode is exclusively prepared for the customer (driver). This mode warns the driver of a system
malfunction through the operation of the ªAIR BAGº warning lamp and/or ªSEAT BELTº warning lamp (Mod-
els except for Europe).
The Diagnosis mode allows the technician to locate and inspect the malfunctioning part.
The mode applications for the ªAIR BAGº warning lamp, ªSEAT BELTº warning lamp (Models except for
Europe) and CONSULT-II are as follows:
User mode Diagnosis mode Display type
ªAIR BAGº warning lamp X X ON-OFF operation
ªSEAT BELTº warning lamp
(Models except for Europe)X Ð ON-OFF operation
CONSULT-II Ð X Monitoring
DIAGNOSIS MODE FOR CONSULT-II
+ªSELF-DIAG [CURRENT]º
A current Self-diagnosis result (also indicated by the warning lamp flashes in the Diagnosis mode) is
displayed on the CONSULT-II screen in real time. This refers to a malfunctioning part requiring repairs.
+ªSELF-DIAG [PAST]º
Diagnosis results previously stored in the memory are displayed on the CONSULT-II screen. The stored
results are not erased until memory erasing is executed.
+ªTROUBLE DIAG RECORDº
With TROUBLE DIAG RECORD, diagnosis results previously erased by a reset operation can be dis-
played on the CONSULT-II screen.
+ªECU DISCRIMINATED NO.º
The diagnosis sensor unit for each vehicle model is assigned with its own, individual classification num-
ber. This number will be displayed on the CONSULT-II 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 confirming this classification number on the CONSULT-II screen. The
diagnosis sensor unit classification number varies depending on SRS configuration.
For NISSAN MODEL Y61, the diagnosis sensor unit classification numbers are as follows.
MODEL ECU DISCRIMINATED NO.
WagonModel with dual air bags and side air bag 5A0F
Model with dual air bags 5A11
Model with single air bag 5A13
HardtopModel with side air bag 5A15
Model with dual air bags 5A17
Model with single air bag 5A19
TROUBLE DIAGNOSES Ð Supplemental Restraint System (SRS)
RS-1019

Self-diagnosis
DIAGNOSTIC PROCEDURE 1 (without
CONSULT-II)
Checking SRS operation by using ªAIR BAGº warning lamp
Ð User mode
1. After turning ignition switch from ªOFFº to ªONº, ªAIR BAGº
warning lamp operates.
2. Compare ªAIR BAGº warning lamp operation to the chart
below.
ªAIR BAGº warning lamp operation Ð User mode Ð SRS condition Reference item
MRS095A
No malfunction is
detected.
No further action is neces-
sary.
Ð
MRS096A
The system is malfunction-
ing and needs to be
repaired as indicated.Go to DIAGNOSTIC PRO-
CEDURE 2, or 6 (RS-1034
or 1044).
MRS097A
Air bag is deployed. Go to COLLISION DIAG-
NOSIS (RS-1052).
Air bag fuse, diagnosis
sensor unit or harness is
malfunctioning and needs
to be repaired.Go to DIAGNOSTIC PRO-
CEDURE 9 (RS-1050).
MRS098A
One of the following has
occurred and needs to be
repaired.
+Meter fuse is blown.
+ªAIR BAGº warning lamp
circuit has open or
short.
+Diagnosis sensor unit is
malfunctioning.Go to DIAGNOSTIC PRO-
CEDURE 10 (RS-1051).
NOTE:
If ªAIR BAGº warning lamp operates differently from the
operations shown above, refer to ªAIR BAGº warning lamp
operation Ð Diagnosis mode Ð, DIAGNOSTIC PROCEDURE
6 (step 4), RS-1044.
SRS465
TROUBLE DIAGNOSES Ð Supplemental Restraint System (SRS)
RS-1032

Checking seat belt pre-tensioner system operation
Check seat belt pre-tensioner system operation using a bulb as
follows:
1. Connect a bulb of less than 3.4W between data link connec-
tor terminals
V3andV8.
2.After turning ignition switch from ªOFFº to ªONº, the bulb oper-
ates.
3.Compare the bulb operation to the chart below.
Lighting condition of the bulb SRS condition Reference item
MRS095A
No malfunction is detected.
No further action is necessary.
Ð
MRS096A
+Seat belt pre-tensioner cir-
cuit is opened, or
+Seat belt pre-tensioner
power supply or ground cir-
cuit is shorted.+If CONSULT-II is available,
go to DIAGNOSTIC PRO-
CEDURE 2 (RS-1034).
+If CONSULT-II is not
available, repair the system
as follows.*
1. Visually check the wiring
harness connections.
2. Replace the harness if it
has visible damage.
3. Replace driver's and front
passenger seat belt assem-
blies.
(Before disposing, they
must be deactivated.)
4. Replace diagnosis sensor
unit.
MRS097A
Seat belt pre-tensioner (and
air bag) is deployed.Go to COLLISION DIAGNO-
SIS (RS-1052).
* Follow the procedures in numerical order when repairing malfunctioning parts. Confirm whether malfunction is eliminated
using a bulb or CONSULT-II each time repair is finished. If malfunction is still observed, proceed to the next step. When
malfunction is eliminated, further repair work is not required.
SRS848
TROUBLE DIAGNOSES Ð Supplemental Restraint System (SRS)
Self-diagnosis (Cont'd)
RS-1033

CONSULT-II DIAGNOSTIC CODE CHART (ªSELF-DIAG [CURRENT]º)
Diagnostic item ExplanationRepair order
Recheck SRS at each
replacement.
NO DTC IS DETECTED When malfunction is indicated
by the ªAIR BAGº warning lamp
in User mode+Self-diagnostic result ªSELF-
DIAG [PAST]º (previously
stored in the memory) might
not be erased after repair.
+Intemittent malfunction has
been detected in the past.+Go to DIAGNOSTIC PROCE-
DURE 4 (RS-1040).
+No malfunction is detected.+Go to DIAGNOSTIC PROCE-
DURE 3 (RS-1038).
AIRBAG MODULE
[OPEN]+Driver's air bag module circuit is open. (including the spiral cable) 1. Visually check the wiring har-
ness connection.
2. Replace the harness if it has
visible damage.
3. Replace the spiral cable.
4. Replace driver's air bag mod-
ule.
(Before disposal of it, it must
be deployed.)
5. Replace the diagnosis sensor
unit.
6. Replace the related harness. AIRBAG MODULE
[VB-SHORT]+Driver's air bag module circuit is shorted to some power supply
circuit. (including the spiral cable)
AIRBAG MODULE
[GND-SHORT]+Driver's air bag module circuit is shorted to ground. (including the
spiral cable)
AIRBAG MODULE
[SHORT]+Driver's air bag module circuits are shorted to each other.
ASSIST A/B MODULE
[VB-SHORT]+Front passenger air bag module circuit is shorted to some power
supply circuit.1. Visually check the wiring har-
ness connection.
2. Replace the harness if it has
visible damage.
3. Replace front passenger air
bag module.
(Before disposal of it, it must
be deployed.)
4. Replace the diagnosis sensor
unit.
5. Replace the related harness. ASSIST A/B MODULE
[OPEN]+Front passenger air bag module circuit is open.
ASSIST A/B MODULE
[GND-SHORT]+Front passenger air bag module circuit is shorted to ground.
ASSIST A/B MODULE
[SHORT]+Front passenger air bag module circuits are shorted to each
other.
SIDE MODULE LH
[OPEN]+Side air bag module (LH) circuit is open. 1. Visually check the wiring har-
ness connection.
2. Replace the harness if it has
visible damage.
3. Replace side air bag module
(LH).
(Before disposal, it must be
deployed.)
4. Replace the diagnosis sensor
unit.
5. Replace the related harness. SIDE MODULE LH
[VB-SHORT]+Side air bag module (LH) circuit is shorted to some power supply
circuits.
SIDE MODULE LH
[GND-SHORT]+Side air bag module (LH) circuit is shorted to ground.
SIDE MODULE LH
[SHORT]+Side air bag module (LH) circuits are shorted to each other.
SIDE MODULE RH
[OPEN]+Side air bag module (RH) circuit is open. 1. Visually check the wiring har-
ness connection.
2. Replace the harness if it has
visible damage.
3. Replace side air bag module
(RH).
(Before disposal, it must be
deployed.)
4. Replace the diagnosis sensor
unit.
5. Replace the related harness. SIDE MODULE RH
[VB-SHORT]+Side air bag module (RH) circuit is shorted to some power supply
circuits.
SIDE MODULE RH
[GND-SHORT]+Side air bag module (RH) circuit is shorted to ground.
SIDE MODULE RH
[SHORT]+Side air bag module (RH) circuits are shorted to each other.
TROUBLE DIAGNOSES Ð Supplemental Restraint System (SRS)
Self-diagnosis (Cont'd)
RS-1036

Diagnostic item ExplanationRepair order
Recheck SRS at each
replacement.
SATELLITE SENS LH
[UNIT FAIL]
SATELLITE SENS LH
[COMM FAIL]+Satellite sensor (LH) 1. Visually check the wiring har-
ness connection.
2. Replace the harness if it has
visible damage.
3. Replace the satellite sensor
(LH).
4. Replace the diagnosis sensor
unit.
5. Replace the related harness.
SATELLITE SENS RH
[UNIT FAIL]
SATELLITE SENS RH
[COMM FAIL]+Satellite sensor (RH) 1. Visually check the wiring har-
ness connection.
2. Replace the harness if it has
visible damage.
3. Replace the satellite sensor
(RH).
4. Replace the diagnosis sensor
unit.
5. Replace the related harness.
PRE-TEN FRONT LH
[OPEN/VB-SHORT]+The circuit for front LH pre-tensioner is open or shorted to some
power supply circuit.1. Visually check the wiring har-
ness connections.
2. Replace the harness if it has
visible damage.
3. Replace front LH seat belt.
(Before disposing, it must be
deactivated.)
4. Replace the diagnosis sensor
unit.
5. Replace the related harness. PRE-TEN FRONT LH
[GND-SHORT]+The circuit for front LH pre-tensioner is shorted to ground.
PRE-TEN FRONT RH
[OPEN/VB-SHORT]+The circuit for front RH pre-tensioner is open or shorted to some
power supply circuit.1. Visually check the wiring har-
ness connections.
2. Replace the harness if it has
visible damage.
3. Replace front RH seat belt.
(Before disposing, it must be
deactivated.)
4. Replace the diagnosis sensor
unit.
5. Replace the related harness. PRE-TEN FRONT RH
[GND-SHORT]+The circuit for front RH pre-tensioner is shorted to ground.
CONTROL UNIT+Low battery voltage (Less than 9V)+Go to DIAGNOSTIC PROCE-
DURE 3 (RS-1038) after
charging battery.
+Diagnosis sensor unit is malfunctioning. 1. Visually check the wiring har-
ness connections.
2. Replace the harness if it has
visible damage.
3. Replace the diagnosis sensor
unit.
4. Replace the air bag harness.
* Follow the procedures in numerical order when repairing malfunctioning parts. Confirm whether malfunction is eliminated
using the air bag warning lamp or CONSULT-II each time repair is finished. If malfunction is still observed, proceed to the
next step. When malfunction is eliminated, further repair work is not required.
TROUBLE DIAGNOSES Ð Supplemental Restraint System (SRS)
Self-diagnosis (Cont'd)
RS-1037

INTERMITTENT MALFUNCTION DIAGNOSTIC CODE CHART (ªSELF-DIAG [PAST]º or
ªTROUBLE DIAG RECORDº)
Diagnostic item Explanation Repair order
NO DTC IS DETECTED+No malfunction is detected.+Go to DIAGNOSTIC PROCEDURE 3 (RS-
1038).
AIRBAG MODULE
[OPEN]+Driver's air bag module circuit is open.
(including the spiral cable)1. Visually check the wiring harness connection.
2. Replace the harness if it has visible damage.
3. If the harness check is OK, replace the spiral
cable, diagnosis sensor unit and driver air
bag module. (Before disposing the driver air
bag module, it must be deployed.) AIRBAG MODULE
[VB-SHORT]+Driver's air bag module circuit is shorted to
some power supply circuit. (including the spi-
ral cable)
AIRBAG MODULE
[GND-SHORT]+Driver's air bag module circuit is shorted to
ground. (including the spiral cable)
AIRBAG MODULE
[SHORT]+Driver's air bag module circuits are shorted to
each other.
ASSIST A/B MODULE
[VB-SHORT]+Front passenger air bag module circuit is
shorted to some power supply circuit.1. Visually check the wiring harness connection.
2. Replace the harness if it has visible damage.
3. If the harness check is OK, replace the diag-
nosis sensor unit and passenger air bag
module. (Before disposing the passenger air
bag module, it must be deployed.) ASSIST A/B MODULE
[OPEN]+Front passenger air bag module circuit is
open.
ASSIST A/B MODULE
[GND-SHORT]+Front passenger air bag module circuit is
shorted to ground.
ASSIST A/B MODULE
[SHORT]+Front passenger air bag module circuits are
shorted to each other.
SIDE MODULE LH
[OPEN]+Side air bag module (LH) circuit is open. 1. Visually check the wiring harness connection.
2. Replace the harness if it has visible damage.
3. If the harness check is OK, replace the diag-
nosis sensor unit and front side air bag mod-
ule (LH). (Before disposing the front side air
bag module (LH), it must be deployed.) SIDE MODULE LH
[VB-SHORT]+Side air bag module (LH) circuit is shorted to
some power supply circuits.
SIDE MODULE LH
[GND-SHORT]+Side air bag module (LH) circuit is shorted to
ground.
SIDE MODULE LH
[SHORT]+Side air bag module (LH) circuits are shorted
to each other.
SIDE MODULE RH
[OPEN]+Side air bag module (RH) circuit is open. 1. Visually check the wiring harness connection.
2. Replace the harness if it has visible damage.
3. If the harness check is OK, replace the diag-
nosis sensor unit and front side air bag mod-
ule (RH). (Before disposing the front side air
bag module (RH), it must be deployed.) SIDE MODULE RH
[VB-SHORT]+Side air bag module (RH) circuit is shorted to
some power supply circuits.
SIDE MODULE RH
[GND-SHORT]+Side air bag module (RH) circuit is shorted to
ground.
SIDE MODULE RH
[SHORT]+Side air bag module (RH) circuits are shorted
to each other.
SATELLITE SENS LH
[UNIT FAIL]
SATELLITE SENS LH
[COMM FAIL]+Satellite sensor (LH) 1. Visually check the wiring harness connection.
2. Replace the harness if it has visible damage.
3. If the harness check is OK, replace the diag-
nosis sensor unit and satellite sensor (LH).
SATELLITE SENS RH
[UNIT FAIL]
SATELLITE SENS RH
[COMM FAIL]+Satellite sensor (RH) 1. Visually check the wiring harness connection.
2. Replace the harness if it has visible damage.
3. If the harness check is OK, replace the diag-
nosis sensor unit and satellite sensor (RH).
CONTROL UNIT+Diagnosis sensor unit is malfunctioning. 1. Visually check the wiring harness connection.
2. Replace the harness if it has visible damage.
3. If the harness check is OK, replace the diag-
nosis sensor unit.
* Follow the procedures in numerical order when repairing malfunctioning parts, then make the final system check.
TROUBLE DIAGNOSES Ð Supplemental Restraint System (SRS)
Self-diagnosis (Cont'd)
RS-1043