INFINITI QX4 2001 Factory Service Manual

How to Perform Trouble Diagnoses for Quick
and Accurate Repair
=NBRS0041A good understanding of the malfunction conditions can make troubleshooting faster and more accurate.
In general, each customer feels differently about a malfunction. It is important to fully understand the symp-
toms or conditions for a customer complaint.
INFORMATION FROM CUSTOMERNBRS0041S01WHAT ..... Vehicle model
WHEN ..... Date, Frequencies
WHERE ..... Road conditions
HOW ..... Operating conditions, Symptoms
PRELIMINARY CHECKNBRS0041S02Check that the following parts are in good order.
IBattery [Refer to SC-4, ªBATTERYº.]
IFuse [Refer to EL-16, ªFuseº, ªPOWER SUPPLY ROUTINGº.]
ISystem component-to-harness connections
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
How to Perform Trouble Diagnoses for Quick and Accurate Repair
RS-32

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
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
BT
HA
SC
EL
IDX
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
How to Perform Trouble Diagnoses for Quick and Accurate Repair (Cont'd)
RS-33

SchematicNBRS0042
MRS325A
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
Schematic
RS-34

Wiring Diagram Ð SRS ÐNBRS0043
MRS326A
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
BT
HA
SC
EL
IDX
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
Wiring Diagram Ð SRS Ð
RS-35

MRS282A
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
Wiring Diagram Ð SRS Ð (Cont'd)
RS-36

MRS327A
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
BT
HA
SC
EL
IDX
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
Wiring Diagram Ð SRS Ð (Cont'd)
RS-37

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

SRS844
Trouble Diagnoses with CONSULT-II=NBRS0045DIAGNOSTIC PROCEDURE 2NBRS0045S01Inspecting SRS malfunctioning parts 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.
SRS771
5. Touch ªAIR BAGº.
SRS697
6. Touch ªSELF-DIAG [CURRENT]º.
SRS772
7. Diagnostic codes are displayed on ªSELF-DIAG [CURRENT]º.
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
BT
HA
SC
EL
IDX
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
Trouble Diagnoses with CONSULT-II
RS-39

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
AIRBAG MODULE
[VB-SHORT]IDriver's air bag module circuit is shorted to some power sup-
ply circuit. (including the spiral cable)1. Visually check the wiring harness
connection.
2. Replace the harness if it has visible
damage.
3. Replace the spiral cable.
4. Replace driver's air bag module.
(Before disposal of it, it must be
deployed.)
5. Replace the diagnosis sensor unit.
6. Replace the related harness. 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. 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]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.
SIDE MODULE LH
[OPEN]ISide air bag module (LH) circuit is open. 1. Visually check the wiring harness
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]ISide air bag module (LH) circuit is shorted to some power
supply circuits.
SIDE MODULE LH
[GND-SHORT]ISide air bag module (LH) circuit is shorted to ground.
SIDE MODULE LH
[SHORT]ISide air bag module (LH) circuits are shorted to each other.
SIDE MODULE RH
[OPEN]ISide air bag module (RH) circuit is open. 1. Visually check the wiring harness
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]ISide air bag module (RH) circuit is shorted to some power
supply circuits.
SIDE MODULE RH
[GND-SHORT]ISide air bag module (RH) circuit is shorted to ground.
SIDE MODULE RH
[SHORT]ISide air bag module (RH) circuits are shorted to each other.
SATELLITE SENS LH
[UNIT FAIL]
SATELLITE SENS LH
[COMM FAIL]ISatellite sensor (LH) 1. Visually check the wiring harness
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]ISatellite sensor (RH) 1. Visually check the wiring harness
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.GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
BT
HA
SC
EL
IDX
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
Trouble Diagnoses with CONSULT-II (Cont'd)
RS-41