warning INFINITI QX4 2001 Factory Service Manual

Trouble Diagnoses Introduction=NBRS0040CAUTION:
IDo 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 tape either just
before the harness connectors or for the complete harness are related to the SRS.
IDo not attempt to repair, splice or modify the SRS wiring harness. If the harness is damaged,
replace it with a new one.
IKeep ground portion clean.
DIAGNOSIS FUNCTIONNBRS0040S01The SRS self-diagnosis results can be read by using ªAIR BAGº warning lamp and/or CONSULT-II. The read-
ing 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.
The Diagnosis mode allows the technician to locate and inspect the malfunctioning part.
The mode applications for the ªAIR BAGº warning lamp and CONSULT-II are as follows:
User mode Diagnosis mode Display type
ªAIR BAGº warning lamp X X ON-OFF operation
CONSULT-II Ð X Monitoring
NOTE:
Seat belt pre-tensioner malfunction is indicated by ªAIR BAGº warning lamp.
DIAGNOSIS MODE FOR CONSULT-IINBRS0040S02IªSELF-DIAG [CURRENT]º
A current Self-diagnosis result (also indicated by the number of 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.
IªSELF-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.
IªTROUBLE DIAG RECORDº
With TROUBLE DIAG RECORD, diagnosis results previously erased by a reset operation can be displayed
on the CONSULT-II screen.
IªECU 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 below. When replacing the diag-
nosis sensor unit, refer to the part number for the compatibility. After installation, replacement with a cor-
rect unit can be checked by confirming this classification number on the CONSULT-II screen.
SRS851
For INFINITI QX4, the diagnosis sensor unit classification numbers assigned is A540.
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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
Trouble Diagnoses Introduction
RS-29

HOW TO CHANGE SELF-DIAGNOSIS MODE WITH CONSULT-II=NBRS0040S03From User Mode to Diagnosis ModeNBRS0040S0301After selecting ªAIR BAGº on the ªSELECT SYSTEMº screen, User mode automatically changes to Diagno-
sis mode.
SRS803
From Diagnosis Mode to User ModeNBRS0040S0302To return to User mode from Diagnosis mode, touch ªBACKº key of CONSULT-II until ªSELECT SYSTEMº
appears, Diagnosis mode automatically changes to User mode.
SRS804
HOW TO CHANGE SELF-DIAGNOSIS MODE WITHOUT CONSULT-IINBRS0040S04From User Mode to Diagnosis ModeNBRS0040S0401Diagnosis mode activates only when a malfunction is detected, by turning ignition switch as follows:
1) Turn ignition switch ªONº.
2) After ªAIR BAGº warning lamp lights for 7 seconds, turn ignition switch ªOFFº within 1 second.
3) Wait more than 3 seconds.
4) Repeat steps 1 to 3 three times.
5) Turn ignition switch ªONº.
SRS will not enter Diagnosis mode, if no malfunction is detected.
From Diagnosis Mode to User ModeNBRS0040S0402After a malfunction is repaired, switch the ignition ªOFFº for at least one second, then back ªONº. Diagnosis
mode is returned to User mode.
If switching Diagnosis mode to User mode is required while malfunction is being detected, by turning ignition
switch as follows:
1) Turn ignition switch ªONº.
2) After ªAIR BAGº warning lamp lights for 7 seconds, turn ignition switch ªOFFº within 1 second.
3) Wait more than 3 seconds.
4) Repeat steps 1 to 3 three times.
5) Turn ignition switch ªONº.
HOW TO ERASE SELF-DIAGNOSIS RESULTSNBRS0040S05With CONSULT-IINBRS0040S0501IªSELF-DIAG [CURRENT]º
A current Self-diagnosis result is displayed on the CONSULT-II screen in real time.
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
Trouble Diagnoses Introduction (Cont'd)
RS-30

After the malfunction is repaired completely, no malfunction is detected on ªSELF-DIAG [CURRENT]º.
IªSELF-DIAG [PAST]º
Return to the ªSELF-DIAG [CURRENT]º CONSULT-II screen by pushing ªBACKº key of CONSULT-II and
select ªSELF-DIAG [CURRENT]º in SELECT DIAG MODE. Touch ªERASEº in ªSELF-DIAG [CURRENT]º
mode.
NOTE:
If the memory of the malfunction in ªSELF-DIAG [PAST]º is not erased, the User mode shows the sys-
tem malfunction by the operation of the warning lamp even if the malfunction is repaired completely.
SRS701
IªTROUBLE DIAG RECORDº
The memory of ªTROUBLE DIAG RECORDº cannot be erased.
Without CONSULT-IINBRS0040S0502After a malfunction is repaired, switch the ignition ªOFFº for at least one second, then back ªONº. Diagnosis
mode returns to the User mode. At that time, the self-diagnostic result is cleared.
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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
Trouble Diagnoses Introduction (Cont'd)
RS-31

WORK FLOW=NBRS0041S03NOTE:
Seat belt pre-tensioner malfunction is indicated by ªAIR BAGº warning lamp.
SRS799
*1: RS-32
*2: RS-38*3: RS-39
*4: RS-48*5: RS-42
*6: RS-53
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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
How to Perform Trouble Diagnoses for Quick and Accurate Repair (Cont'd)
RS-33

SRS800
SRS Operation CheckNBRS0044DIAGNOSTIC PROCEDURE 1NBRS0044S01Checking Air Bag Operation by Using ªAIR BAGº
Warning Lamp Ð User Mode
NBRS0044S01011. 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 necessary.
Ð
MRS096A
The system is malfunction-
ing and needs to be
repaired as indicated.Go to DIAGNOSTIC PRO-
CEDURE 2 or 6 (RS-39 or
RS-48).
MRS097A
Air bag is deployed.
Seat belt pre-tensioner is
deployed.Go to COLLISION DIAG-
NOSIS (RS-56).
Air bag fuse, diagnosis
sensor unit or harness is
malfunctioning and needs
to be repaired.Go to DIAGNOSTIC PRO-
CEDURE 9 (RS-59).
MRS098A
One of the following has
occurred and needs to be
repaired.
IMeter fuse is blown.
IªAIR BAGº warning
lamp circuit has open or
short.
IDiagnosis sensor unit is
malfunctioning.Go to DIAGNOSTIC PRO-
CEDURE 10 (RS-58).
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-48.
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
SRS Operation Check
RS-38

SRS701
If no malfunction is detected on ªSELF-DIAG [CURRENT]º even
though malfunction is detected in ªSRS Operation Checkº, check
the battery voltage.
If the battery voltage is less than 9V, charge the battery. Then go
to DIAGNOSTIC PROCEDURE 3, page RS-42.
If the battery voltage is OK, go to DIAGNOSTIC PROCEDURE 4,
page RS-44, to diagnose the following cases:
ISelf-diagnostic result ªSELF-DIAG [PAST]º (previously stored
in the memory) might not be erased after repair.
IThe SRS system malfunctions intermittently.
8. Touch ªPRINTº.
9. Compare diagnostic codes to ªCONSULT-II Diagnostic Code
Chartº, page RS-40.
10. Touch ªBACKº key of CONSULT-II until ªSELECT SYSTEMº
appears in order to return to User mode from Diagnosis mode.
11. Turn ignition switch ªOFFº, then turn off and disconnect
CONSULT-II, and disconnect both battery cables.
12. Repair the system as outlined by the ªRepair orderº in ªCON-
SULT-II Diagnostic Code Chartº, that corresponds to the self-
diagnostic result. For replacement procedure of component
parts, refer to RS-15.
13. After repairing the system, go to DIAGNOSTIC PROCEDURE
3, page RS-42 for final checking.
CONSULT-II Diagnostic Code Chart (ªSELF-DIAG
[CURRENT]º)
NBRS0045S0101
Diagnostic item ExplanationRepair order
ªRecheck SRS at each replace-
ment.º
NO DTC IS
DETECTED.When malfunction is
indicated by the ªAIR
BAGº warning lamp in
User modeILow battery voltage (Less than 9V)IGo to DIAGNOSTIC PROCEDURE 3
(RS-42) after charging battery.
ISelf-diagnostic result ªSELF-DIAG
[PAST]º (previously stored in the
memory) might not be erased after
repair.
IIntermittent malfunction has been
detected in the past.IGo to DIAGNOSTIC PROCEDURE 4
(RS-44).
INo malfunction is detected.IGo to DIAGNOSTIC PROCEDURE 3
(RS-42).
AIRBAG MODULE
[OPEN]IDriver'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. 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.
6. Replace the related harness.
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
Trouble Diagnoses with CONSULT-II (Cont'd)
RS-40

Diagnostic item ExplanationRepair order
ªRecheck SRS at each replace-
ment.º
PRE-TEN FRONT LH
[OPEN/VB-SHORT]IThe circuit for front LH pre-tensioner is open or shorted to
some power supply circuit.1. Visually check the wiring harness
connections.
2. Replace the harness if it has visible
damage.
3. Replace front LH seat belt.
(Before disposing, it must be deacti-
vated.)
4. Replace the diagnosis sensor unit.
5. Replace the related harness. PRE-TEN FRONT LH
[GND-SHORT]IThe circuit for front LH pre-tensioner is shorted to ground.
PRE-TEN FRONT RH
[OPEN/VB-SHORT]IThe circuit for front RH pre-tensioner is open or shorted to
some power supply circuit.1. Visually check the wiring harness
connections.
2. Replace the harness if it has visible
damage.
3. Replace front RH seat belt.
(Before disposing, it must be deacti-
vated.)
4. Replace the diagnosis sensor unit.
5. Replace the related harness. PRE-TEN FRONT RH
[GND-SHORT]IThe circuit for front RH pre-tensioner is shorted to ground.
CONTROL UNITIDiagnosis sensor unit is malfunctioning. 1. Visually check the wiring harness
connection.
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-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.
SRS844
DIAGNOSTIC PROCEDURE 3NBRS0045S02Final checking after repairing SRS by using CONSULT-II Ð
Diagnosis mode
1. After repairing SRS, connect both battery cables.
2. Connect CONSULT-II to Data link connector.
3. Turn ignition switch from ªOFFº to ªONº.
SRS695
4. Touch ªSTARTº.
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
Trouble Diagnoses with CONSULT-II (Cont'd)
RS-42

SRS771
5. Touch ªAIR BAGº.
SRS697
6. Touch ªSELF-DIAG [CURRENT]º.
SRS701
7. If no malfunction is detected on ªSELF-DIAG [CURRENT]º,
repair of SRS is completed. Go to step 8.
If any malfunction is displayed on ªSELF-DIAG [CURRENT]º,
the malfunctioning part is not repaired completely or another
malfunctioning part is detected. Go to DIAGNOSTIC PROCE-
DURE 2, page RS-39, and repair malfunctioning part com-
pletely.
SRS773
8. Touch ªERASEº.
NOTE:
Touch ªERASEº to clear the memory of the malfunction
(ªSELF-DIAG [PAST]º).
If the memory of the malfunction in ªSELF-DIAG [PAST]º is not
erased, the User mode shows the system malfunction by the
operation of the warning lamp even if the malfunction is repaired
completely.
SRS697
9. Touch ªBACKº key of CONSULT-II to ªSELECT SYSTEMº
screen. Touch ªSELF-DIAG [PAST]º.
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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
Trouble Diagnoses with CONSULT-II (Cont'd)
RS-43

SRS702
10. Check that no malfunction is detected on ªSELF-DIAG
[PAST]º.
11. Touch ªBACKº key of CONSULT-II until ªSELECT SYSTEMº
appears in order to return to User mode from Diagnosis mode.
12. Turn ignition switch ªOFFº, then turn off and disconnect CON-
SULT-II.
13. Go to ªSRS Operation Checkº, page RS-38 to check SRS
operation by using ªAIR BAGº warning lamp with User mode.
DIAGNOSTIC PROCEDURE 4 (CONTINUED FROM
DIAGNOSTIC PROCEDURE 2)
NBRS0045S03Inspecting SRS malfunctioning record
1 CONSIDER POSSIBILITY OF NOT ERASING SELF-DIAGNOSTIC RESULT AFTER REPAIRING
Is it the first time for maintenance of SRS?
YesorNo
Ye s©Go to DIAGNOSTIC PROCEDURE 5 (RS-44).
No©Self-diagnostic result ªSELF-DIAG [PAST]º (previously stored in the memory) might not
be erased after repair. Go to DIAGNOSTIC PROCEDURE 3, step 8 (RS-42).
SRS844
DIAGNOSTIC PROCEDURE 5NBRS0045S04Inspecting SRS intermittent malfunction by using CONSULT-II
Ð Diagnosis mode
1. Turn ignition switch ªOFFº.
2. Connect CONSULT-II to Data link connector.
SRS695
3. Turn ignition switch ªONº.
4. Touch ªSTARTº.
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
Trouble Diagnoses with CONSULT-II (Cont'd)
RS-44

SRS704
9. Diagnostic code is displayed on ªTROUBLE DIAG RECORDº.
10. Touch ªPRINTº.
11. Compare diagnostic codes to ªIntermittent Malfunction Diag-
nostic Code Chartº, page RS-46.
12. Touch ªBACKº key of CONSULT-II until ªSELECT SYSTEMº
appears.
13. Turn ignition switch ªOFFº, then turn off and disconnect
CONSULT-II, and disconnect both battery cables.
14. Repair the system as outlined by the ªRepair orderº in ªInter-
mittent Malfunction Diagnostic Code Chartº, that corresponds
to the self-diagnostic result. For replacement procedure of
component parts, refer to RS-15.
15. Go to DIAGNOSTIC PROCEDURE 3, page RS-42, for final
checking.
Intermittent Malfunction Diagnostic Code Chart (ªSELF-
DIAG [PAST]º or ªTROUBLE DIAG RECORDº)
NBRS0045S0401
Diagnostic item Explanation Repair order
NO DTC IS
DETECTED.When malfunction is
indicated by the ªAIR
BAGº warning lamp in
User modeILow battery voltage (Less than 9V)IGo to DIAGNOSTIC PROCEDURE
3 (RS-42) after charging battery.
INo malfunction is detected.IGo to DIAGNOSTIC PROCEDURE
3 (RS-42).
AIRBAG MODULE
[OPEN]IDriver'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 result is OK,
replace driver's air bag module
(Before disposal of it, it must be
deployed.), diagnosis sensor unit
and spiral cable. AIRBAG MODULE
[VB-SHORT]IDriver's air bag module circuit is shorted to some power sup-
ply circuit. (including the spiral cable)
AIRBAG MODULE
[GND-SHORT]IDriver's air bag module circuit is shorted to ground. (including
the spiral cable)
AIRBAG MODULE
[SHORT]IDriver's air bag module circuits are shorted to each other.
ASSIST A/B MODULE
[VB-SHORT]IFront 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 result is OK,
replace front air bag module
(Before disposal of it, it must be
deployed.), and diagnosis sensor
unit. ASSIST A/B MODULE
[OPEN]IFront passenger air bag module circuit is open.
ASSIST A/B MODULE
[GND-SHORT]IFront passenger air bag module circuit is shorted to ground.
ASSIST A/B MODULE
[SHORT]IFront passenger air bag module circuits are shorted to each
other.
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
Trouble Diagnoses with CONSULT-II (Cont'd)
RS-46