1998 NISSAN PICK-UP Repair Manual

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

HOW TO CHANGE SELF-DIAGNOSIS MODE
With CONSULT
From User mode to Diagnosis mode
After selecting AIR BAG on the ``SELECT SYSTEM'' screen, User mode automatically changes to Diagno-
sis mode.
From Diagnosis mode to User mode
To return to User mode from Diagnosis mode, touch ``BACK'' key of CONSULT until ``SELECT SYSTEM''
appears. Diagnosis mode automatically changes to User mode.
Without CONSULT
From User mode to Diagnosis mode
Diagnosis mode activates only when a malfunction is detected,
by pressing the driver's door switch at least 5 times within 7
seconds after turning the ignition ``ON''. SRS will not enter Diag-
nosis mode if no malfunction is detected.
From Diagnosis mode to User mode
When a malfunction is detected to return to User mode from Diagnosis mode, switch the ignition ``OFF'', then
back ``ON'' and press the driver's door switch at least 5 times within 7 seconds.
After a malfunction is repaired, switch the ignition ``OFF'' for at least one second, then back ``ON''. Diagno-
sis mode returns to User mode.
SRS391
SRS392
SRS406
TROUBLE DIAGNOSES Ð Supplemental Restraint System (SRS) Ð
4WD models
Trouble Diagnoses Introduction (Cont'd)
RS-23

HOW TO ERASE SELF-DIAGNOSIS RESULTS
With CONSULT
l``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]''.
l``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.
l``TROUBLE DIAG RECORD''
The memory of TROUBLE DIAG RECORD cannot be erased.
Without CONSULT
After a malfunction is repaired, switch the ignition ``OFF'' for at least one second, then back ``ON''. Diagno-
sis mode returns to the User mode. 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.
lBattery [Refer to EL section (``BATTERY'').]
lFuse [Refer to EL section (``Fuse'', ``POWER SUPPLY ROUTING'').]
lSystem component-to-harness connections
SRS357
TROUBLE DIAGNOSES Ð Supplemental Restraint System (SRS) Ð
4WD models
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.
Perform self-diagnosis using ``AIR BAG'' warning lamp Ð User modebDIAGNOSTIC PROCEDURE 1
(RS-28)
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-29)
DIAGNOSTIC PROCEDURE 6:
Using ``AIR BAG'' warning lamp
(RS-37)
Repair/Replace
NGFinal check Ð Diagnosis mode and User mode
OK
bDIAGNOSTIC PROCEDURE 3:
Using CONSULT (RS-31)
DIAGNOSTIC PROCEDURE 7:
Using ``AIR BAG'' warning lamp
(RS-38)
Check out
.
.
.
.
.
.
.
.
TROUBLE DIAGNOSES Ð Supplemental Restraint System (SRS) Ð
4WD models
How to Perform Trouble Diagnoses for
Quick and Accurate Repair (Cont'd)
RS-25

Wiring Diagram Ð SRS Ð
HRS024
TROUBLE DIAGNOSES Ð Supplemental Restraint System (SRS) Ð
4WD models
RS-26

HRS035
TROUBLE DIAGNOSES Ð Supplemental Restraint System (SRS) Ð
4WD models
Wiring Diagram Ð SRS Ð (Cont'd)
RS-27

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

Trouble Diagnoses with CONSULT
DIAGNOSTIC PROCEDURE 2
Inspecting SRS malfunctioning parts by using CONSULT Ð
Diagnosis mode
1. Turn ignition switch ``OFF''.
2. Connect ``CONSULT'' to Data link connector.
3. Turn ignition switch ``ON''.
4. Touch ``START''.
5. Touch ``AIRBAG''.
6. Touch ``SELF-DIAG [CURRENT]''.
7. Diagnostic codes are displayed on ``SELF-DIAG [CUR-
RENT]''.
SEF056U
SRS046
MRS125A
SRS047
SRS048
TROUBLE DIAGNOSES Ð Supplemental Restraint System (SRS) Ð
4WD models
RS-29