1998 NISSAN PICK-UP sensor

To repair the SRS ``AIR BAG'', perform the following steps:
When SRS is activated in a collision:
V1Remove the air bag module.
V2Remove the steering wheel assembly.
V3Check the spiral cable using the table shown below:
lIf the spiral cable shows any visible damage such as dents, cracks, or deformation, replace it with
a new one.
V4Install new steering wheel assembly.
V5Install new air bag module.
V6Conduct self-diagnosis using ``AIR BAG'' warning lamp to ensure that entire SRS operates properly.
Refer to RS-19 for details.
When SRS is not activated in a collision:
V1Check the SRS components using the table shown below:
lIf the SRS components show any visible damage such as dents, cracks, or deformation, replace
them with new ones.
V2Conduct self-diagnosis using ``AIR BAG'' warning lamp to ensure that entire SRS operates properly.
Refer to RS-19 for details.
SRS inspection
Part SRS is activated SRS is NOT activated
Air bag module REPLACE
Install with new
bolts.1. Remove air bag module. Check harness cover and connectors for damage, ter-
minals for deformities, and harness for binding.
2. Install air bag module into the steering wheel to check fit and alignment with the
wheel.
3. No damage found, reinstall with new bolts.
4. If damagedÐREPLACE. Air bag must be deployed before discarding.
Steering wheel
assembly (including
diagnosis sensor
unit)REPLACE 1. Visually check steering wheel for deformities.
2. Check harness and connectors for damage, and terminals for deformities.
3. Check diagnosis sensor unit for dents, cracks or deformities.
Do not remove diagnosis sensor unit from steering wheel.
4. Install air bag module to check fit or alignment with steering wheel.
5. If no damage is found, reinstall the steering wheel assembly.
6. If damagedÐREPLACE.
Spiral cable 1. Check spiral cable for dents, cracks or deformities.
2. Check connectors and protective tape for damage.
3. Check steering wheel for noise, binding or heavy operation.
4. If no damage is found, reinstall it.
5. If damagedÐREPLACE.
Harness and Con-
nectors1. Check connectors for poor connection, damage, and terminals for deformities.
2. Check harness for binding, chafing, cuts, or deformities.
3. If no damage is found, reinstall the harness and connectors.
4. DamagedÐREPLACE damaged section of harness. Do not attempt to repair, splice or modify any SRS
harness.
COLLISION DIAGNOSIS Ð 2WD models
RS-21

Trouble Diagnoses Introduction
CAUTION:
lDo not use a circuit tester to check SRS harness connectors unless instructed to in this Service
Manual. SRS wiring harnesses can be identified with yellow harness protector or yellow insula-
tion tape before the harness connectors.
lDo not attempt to repair, splice or modify the SRS wiring harness. If the harness is damaged,
replace it with a new one.
lKeep ground portion clean.
DIAGNOSIS FUNCTION
The SRS self-diagnosis results can be read by using ``AIR BAG'' warning lamp and/or CONSULT. 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
l``SELF-DIAG [CURRENT]''
A current Self-diagnosis result (also indicated by the warning lamp flashes in the Diagnosis mode) is
displayed on the CONSULT screen in real time. This refers to a malfunctioning part requiring repairs.
l``SELF-DIAG [PAST]''
Diagnosis results previously stored in the memory (also indicated by the warning lamp flashes in the
Diagnosis mode) are displayed on the CONSULT screen. The stored results are not erased until memory
erasing is executed.
l``TROUBLE DIAG RECORD''
With TROUBLE DIAG RECORD, diagnosis results previously erased by a reset operation can be dis-
played on the CONSULT screen.
lECU DISCRIMINATED NO.
The diagnosis sensor unit for each vehicle model is assigned
with its own, individual classification 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 confirming this classi-
fication number on the CONSULT screen.
For NISSAN D22 4WD models, the diagnosis sensor unit
classification number assigned is 74.
SRS403
TROUBLE DIAGNOSES Ð Supplemental Restraint System (SRS) Ð
4WD models
RS-22

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 neces-
sary.
Ð
MRS096A
The system has problem
and needs to be repaired
as indicated.Go to DIAGNOSTIC PRO-
CEDURE 2 or 6 (RS-29 or
37).
MRS097A
Air bag is deployed. Go to COLLISION DIAG-
NOSIS (RS-42).
Air bag fuse, diagnosis
sensor unit or harness is
malfunctioning and needs
to be repaired.Go to DIAGNOSTIC PRO-
CEDURE 9 (RS-40).
MRS098A
One of the following has
occurred and needs to be
repaired.
lMeter fuse is blown.l``AIR BAG'' warning
lamp circuit has short.
lDiagnosis sensor unit is
malfunctioning.Go to DIAGNOSTIC PRO-
CEDURE 10 (RS-41).
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-37.
SRS405
TROUBLE DIAGNOSES Ð Supplemental Restraint System (SRS) Ð
4WD models
RS-28

If no self-diagnostic failure is detected on ``SELF-DIAG [CUR-
RENT]'' even though malfunction is detected in DIAGNOSTIC
PROCEDURE 1, check the battery voltage. If the battery voltage
is less than 9V, charge the battery. Then go to DIAGNOSTIC
PROCEDURE 3, page RS-31. If the battery voltage is OK, go to
DIAGNOSTIC PROCEDURE 4, page RS-33, to diagnose the
following situations:
lDiagnosis results (previously stored in the memory) might not
be erased after repair.
lThe SRS system malfunctions intermittently.
8. Touch ``PRINT''.
9. Compare diagnostic codes to the CONSULT DIAGNOSTIC
CODE CHART, page RS-30.
10. Touch ``BACK'' key of CONSULT until SELECT SYSTEM
appears in order to return to User mode from Diagnosis
mode, then turn off CONSULT.
11. Turn ignition switch ``OFF'', then disconnect CONSULT and
both battery cables.
12. Repair the system as outlined by the ``Repair order'' in CON-
SULT DIAGNOSTIC CODE CHART, that corresponds to the
problem code. For replacement procedure of component
parts, refer to RS-10.
13. After repairing the system, go to DIAGNOSTIC PROCE-
DURE 3 for final checking, page RS-31.
CONSULT DIAGNOSTIC CODE CHART (``SELF-DIAG [CURRENT]'')
Diagnostic item Explanation/Possible causesRepair order
Recheck SRS at each replace-
ment.
NO SELF DIAGNOSTIC
FAILURE INDICATED.When malfunction is indi-
cated by the ``AIR BAG''
warning lamp in User
mode.
lSelf-diagnostic failure ``SELF-
DIAG [PAST]'' (previously stored
in the memory) might not be
erased after repair.
lIntermittent problem has been
detected in the past.
lGo to DIAGNOSTIC PROCE-
DURE 4 (RS-33).
lNo malfunction is detected.lGo to DIAGNOSTIC PROCE-
DURE 3 (RS-31).
AIRBAG MODULE
[OPEN]
lDriver'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 vis-
ible damage.
3. Replace driver's air bag module.
(Before disposal of it, it must be
deployed.)
4. Replace the spiral cable.
5. Replace the diagnosis sensor
unit. AIRBAG MODULE
[VB-SHORT]
lDriver's air bag module circuit is shorted to some power sup-
ply circuit. (including the spiral cable)
AIRBAG MODULE
[GND-SHORT]
lDriver's air bag module circuit is shorted to ground. (including
the spiral cable)
AIRBAG MODULE
[SHORT]
lDriver's air bag module circuits are shorted to each other.
CONTROL UNIT
lDiagnosis sensor unit is out of order. 1. Visually check the wiring harness
connections.
2. Replace the diagnosis sensor
unit.
* Follow the procedures in numerical order when repairing malfunctioning parts. Confirm whether malfunction is eliminated
using the air bag warning lamp or CONSULT 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.
SRS049
TROUBLE DIAGNOSES Ð Supplemental Restraint System (SRS) Ð
4WD models
Trouble Diagnoses with CONSULT (Cont'd)
RS-30

INTERMITTENT PROBLEM DIAGNOSTIC CODE CHART (``SELF-DIAG [PAST]'' or
``TROUBLE DIAG RECORD'')
Diagnostic item Explanation Repair order
NO SELF DIAGNOSTIC
FAILURE INDICATED.
lNo malfunction is detected.lGo to DIAGNOSTIC PROCEDURE 3 (RS-31)
after charging battery.
AIRBAG MODULE
[OPEN]
lDriver's air bag module circuit is open.
(including the spiral cable)lVisually check the wiring harness connection.
lReplace the harness if it has visible damage.
lReplace driver's air bag module.
(Before disposal of it, it must be deployed.)
lReplace the spiral cable.
lReplace the diagnosis sensor unit. AIRBAG MODULE
[VB-SHORT]
lDriver's air bag module circuit is shorted to
some power supply circuit. (including the spi-
ral cable)
AIRBAG MODULE
[GND-SHORT]
lDriver's air bag module circuit is shorted to
ground. (including the spiral cable)
AIRBAG MODULE
[SHORT]
lDriver's air bag module circuits are shorted to
each other.
CONTROL UNIT
lDiagnosis sensor unit is out of order.lVisually check the wiring harness connection.
lReplace the diagnosis sensor unit.
* Intermittent problem areas cannot be easily located. For this reason, perform the procedures outlined under the repair order, then
make the final system check.
TROUBLE DIAGNOSES Ð Supplemental Restraint System (SRS) Ð
4WD models
Trouble Diagnoses with CONSULT (Cont'd)
RS-36

AIR BAG WARNING LAMP FLASH CODE CHART (DIAGNOSIS MODE)
Warning
lampFlash codeVd(# of flashes)ExplanationRepair order
Recheck SRS at each replacement.
``AIR BAG'' warning lamp
0lSelf-diagnostic failure might not be erased after
repair.
lIntermittent problem has been detected in the
past.Go to DIAGNOSTIC PROCEDURE 8 (RS-40).
2 The driver's air bag module circuit is out of order. 1. Visually check the wiring harness connections.
2. Replace the spiral cable.
3. Replace the driver's air bag module.
(Before disposing of it, it must be deployed.)
4. Replace the diagnosis sensor unit.
5. Replace the air bag harness.
7 The diagnosis sensor unit is out of order. 1. Visually check the wiring harness connections.
2. Replace the diagnosis sensor unit.
* Follow the procedures in numerical order when repairing malfunctioning parts. Confirm whether malfunction is eliminated
using the air bag warning lamp (in User mode) or CONSULT 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.
DIAGNOSTIC PROCEDURE 7
Final checking after repairing SRS by using ``AIR BAG''
warning lamp Ð Diagnosis mode and User mode
1. After repairing SRS connect both battery cables.
2. Open driver's door.
3. Turn ignition switch from ``OFF'' to ``ON''.
4. ``AIR BAG'' warning lamp operates in Diagnosis mode as
follows:
No. ``AIR BAG'' warning lamp flash pattern Ð Diagnosis mode Ð SRS condition
1
SRS333
VathroughVbare repeated. No malfunc-
tion is
detected or
repair is com-
pleted.
No further
action is nec-
essary.
2
SRS341
VathroughVdare repeated.
VbÐ Driver and passenger air
bag marker (For identifying
driver and/or passenger air
bag malfunctioning)
VdÐ Indicates malfunctioning
part. The number of
flashes varies with mal-
functioning part (0.5 sec.
ON and 0.5 sec. OFF is
counted as one flash.)The system
has a problem
and needs to
be repaired.
NOTE:
When diagnosis sensor unit is replaced with new one, ``AIR
BAG'' warning lamp will operate in User mode. Checking
``AIR BAG'' warning lamp operation in Diagnosis mode is
not required. Go to step 6.
SRS406
TROUBLE DIAGNOSES Ð Supplemental Restraint System (SRS) Ð
4WD models
Trouble Diagnoses without CONSULT
(Cont'd)
RS-38

5. If ``AIR BAG'' warning lamp operates as shown in No. 1 in
chart above, turn ignition switch ``OFF'' to reset from Diag-
nosis mode to User mode and to erase the memory of the
malfunction. Then go to step 6.
If ``AIR BAG'' warning lamp operates as shown in No. 2 or
No. 3 in chart above, the malfunctioning part is not repaired
completely, or another malfunctioning part is detected. Go to
DIAGNOSTIC PROCEDURE 6, page RS-37, and repair mal-
functioning part completely.
6. Turn ignition switch ``ON''. ``AIR BAG'' warning lamp operates
in User mode. Compare ``AIR BAG'' warning lamp operation
to the chart below.
NOTE:
If switching Diagnosis mode to User mode is required while
malfunction is being detected, turn ignition switch from
``OFF'' to ``ON''. Then press driver's door switch at least 5
times within 7 seconds after turning ignition switch ``ON''.
SRS is now in User mode.
``AIR BAG'' 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 has problem
and needs to be repaired
as indicated.Go to DIAGNOSTIC PRO-
CEDURE 2 or 6 (RS-29 or
37).
MRS097A
Air bag is deployed. Go to COLLISION DIAG-
NOSIS (RS-42).
Air bag fuse, diagnosis
sensor unit or harness is
malfunctioning and needs
to be repaired.Go to DIAGNOSTIC PRO-
CEDURE 9 (RS-40).
MRS098A
One of the following has
occurred and needs to be
repaired.
lMeter fuse is blown.
l``AIR BAG'' warning
lamp circuit has open or
short.
lDiagnosis sensor unit is
malfunctioning.Go to DIAGNOSTIC PRO-
CEDURE 10 (RS-41).
TROUBLE DIAGNOSES Ð Supplemental Restraint System (SRS) Ð
4WD models
Trouble Diagnoses without CONSULT
(Cont'd)
RS-39

DIAGNOSTIC PROCEDURE 8 (Continued from
DIAGNOSTIC PROCEDURE 6)
Inspecting SRS malfunctioning record
Is it the first time for maintenance of
SRS?
Yes
cNo
Diagnosis results (previ-
ously stored in the
memory) might not be
erased after repair.
Go to DIAGNOSTIC
PROCEDURE 7, step 5
(RS-38).
GO TO DIAGNOSTIC PROCEDURE 5
(RS-34). (Further inspection cannot be
performed without using CONSULT.)
Trouble Diagnoses: Air Bag Warning Lamp
Does Not Turn OFF
DIAGNOSTIC PROCEDURE 9
Is air bag deployed?
No
cYes
Refer to COLLISION
DIAGNOSIS (RS-42).
Is SRS ``Air Bag'' fuse OK?
Yes
cNo
Replace fuse.
Connect CONSULT and touch
``START''.
lIs ``AIRBAG'' displayed on
CONSULT?
Yes
cNo
Visually check the wiring
harness connection of
diagnosis sensor unit. If
the harness connection
checks OK, replace diag-
nosis sensor unit.
Is harness connection between warning
lamp and diagnosis sensor unit OK?
Yes
cNo
Connect warning lamp and
diagnosis sensor unit con-
nector properly. If warning
lamp still does not go off,
replace harness.
Replace diagnosis sensor unit.
SRS316
MRS125A
.
.
.
.
.
TROUBLE DIAGNOSES Ð Supplemental Restraint System (SRS) Ð
4WD models
Trouble Diagnoses without CONSULT
(Cont'd)
RS-40