NISSAN LATIO 2007 Service Repair Manual

OCCUPANT CLASSIFICATION SYSTEM CONTROL UNIT
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SRS
Revision: June 20062007 Versa
OCCUPANT CLASSIFICATION SYSTEM CONTROL UNITPFP:98852
Removal and InstallationEHS0 01 VA
The occupant classification system control unit, occupant classification system sensor, and bladder are an
integral part of the front passenger seat cushion and are replaced as an assembly. Refer to SE-10, "
FRONT
SEAT" to remove the seat, and SE-12, "SEAT CUSHION TRIM AND PAD" to replace the seat cushion.

SRS-54
COLLISION DIAGNOSIS
Revision: June 20062007 Versa
COLLISION DIAGNOSISPFP:00015
For Frontal CollisionEHS001VB
Check the SRS components using the following table.

After the work is completed, perform self-diagnosis to check that no malfunction is detected. Refer to
SRS-21, "
SRS Operation Check" .
SRS INSPECTION (FOR FRONTAL COLLISION)
Part SRS is activated SRS is NOT activated
Driver air bag module If the driver air bag
has deployed:
REPLACE
Install with new fas-
teners.If the driver air bag has NOT been activated:
1. Remove driver air bag module. Check harness cover and connectors for damage,
terminals for deformities, and harness for binding.
2. Install driver air bag module into the steering wheel to check fit and alignment with
the wheel.
3. If no damage is found, reinstall with new fasteners.
4. If damaged—REPLACE. Install driver air bag modules with new fasteners.
Front passenger air
bag moduleIf the front passenger
air bag has deployed:
REPLACE
Install with new fas-
teners.If the front passenger air bag has NOT been activated:
1. Remove front passenger air bag module. Check harness cover and connectors for
damage, terminals for deformities, and harness for binding.
2. Install front passenger air bag module into the instrument panel to check fit with the
instrument panel.
3. If no damage is found, reinstall with new fasteners.
4. If damaged—REPLACE. Install front passenger air bag modules with new fasten-
ers.
Crash zone sensor If any of the front air
bags or seat belt pre-
tensioners* have
been activated:
REPLACE the crash
zone sensor and
bracket with new fas-
teners.
*: Confirm seat belt
pre-tensioner activa-
tion using CONSULT-
II only.If the front air bags or seat belt pre-tensioners have NOT been activated:
1. Remove the crash zone sensor. Check harness connectors for damage, terminals
for deformities, and harness for binding.
2. Check for visible signs of damage (dents, cracks, deformation) of the crash zone
sensor and bracket.
3. Install the crash zone sensor to check fit.
4. If no damage is found, reinstall with new fasteners.
5. If damaged—REPLACE the crash zone sensor and bracket with new fasteners.
Seat belt pre-ten-
sioner assemblies
(All applicable loca-
tions: buckle, reel, lap
outer)If either the driver or
passenger seat belt
pre-tensioner* has
been activated:
REPLACE all seat
belt pre-tensioner
assemblies with new
fasteners.
*: Confirm seat belt
pre-tensioner activa-
tion using CONSULT-
II only.If the pre-tensioners have NOT been activated:
1. Remove seat belt pre-tensioners.
Check harness cover and connectors for damage, terminals for deformities, and
harness for binding.
2. Check belts for damage and anchors for loose mounting.
3. Check retractor for smooth operation.
4. Check seat belt adjuster for damage.
5. Check for deformities of the center pillar inner.
6. If the center pillar inner has no damage, REPLACE the seat belt pre-tensioner
assembly.
7. If no damage is found, reinstall seat belt pre-tensioner assembly.
8. If damaged—REPLACE. Install the seat belt pre-tensioners with new fasteners.
Diagnosis sensor unit If any of the SRS
components have
been activated:
REPLACE the diag-
nosis sensor unit.
Install with new fas-
teners.If none of the SRS components have been activated:
1. Check case for dents, cracks or deformities.
2. Check connectors for damage, and terminals for deformities.
3. If no damage is found, reinstall with new fasteners.
4. If damaged—REPLACE. Install diagnosis sensor unit with new fasteners.

COLLISION DIAGNOSIS
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Revision: June 20062007 Versa
For Side and Rollover CollisionEHS001VC
Check the SRS components using the following table.

After the work is completed, perform self-diagnosis to check that no malfunction is detected. Refer to
SRS-21, "
SRS Operation Check" .
WHEN SRS IS ACTIVATED IN THE SIDE OR ROLLOVER COLLISION
1. Replace the following components:
–Front seat back assembly (on the side on which side air bag is activated)
–Diagnosis sensor unit
–(LH or RH) side air bag (satellite) sensor (on the side on which side air bag is activated)
2. Check the SRS components and the related parts using the following table.
–Replace any SRS components and the related parts showing visible signs of damage (dents, cracks,
deformation).
3. Conduct self-diagnosis using CONSULT-II and “AIR BAG” warning lamp. Refer to SRS-21, "
SRS Opera-
tion Check" for details. Ensure entire SRS operates properly.
WHEN SRS IS NOT ACTIVATED IN THE SIDE OR ROLLOVER COLLISION
1. Check the SRS components and the related parts using the following table.
–If the front seat back assembly is damaged, the front seat back assembly must be replaced.
2. Conduct self-diagnosis using CONSULT-II and “AIR BAG” warning lamp. Refer to SRS-21, "
SRS Opera-
tion Check" for details. Ensure entire SRS operates properly.
Steering wheel 1. Visually check steering wheel for deformities.
2. Check harness (built into steering wheel) and connectors for damage, and terminals for deformities.
3. Install driver air bag module into the steering wheel to check fit and alignment with the wheel.
4. Check steering wheel for excessive free play.
5. If no damage is found, reinstall.
6. If damaged—REPLACE.
Spiral cable If the driver front air
bag has deployed:
REPLACE the spiral
cable.If the driver front air bag has not deployed:
1. Visually check spiral cable and combination switch for damage.
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.
5. If damaged—REPLACE.
Occupant classifica-
tion system (Passen-
ger seat)1. Remove passenger seat.
2. Check control unit case for dents, cracks of deformities.
3. Check connectors and pressure sensor tube for damage, and terminals for deformities.
4. Check seat frame and cushion pan for dents or deformities.
5. If no damage is found, reinstall seat with new fasteners.
6. If damaged — REPLACE seat cushion assembly with new fasteners.
Harness and connec-
tors1. 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. If damaged—REPLACE the damaged harness. Do not attempt to repair, splice or modify any SRS harness.
Instrument panel If the passenger front
air bag has deployed:
REPLACE the instru-
ment panel assembly.If the passenger front air bag has NOT deployed:
1. Visually check instrument panel for damage.
2. If no damage is found, reinstall the instrument panel.
3. If damaged—REPLACE the instrument panel. Part SRS is activated SRS is NOT activated

SRS-56
COLLISION DIAGNOSIS
Revision: June 20062007 Versa
SRS INSPECTION (FOR SIDE AND ROLLOVER COLLISION)
Part SRS is activated SRS is NOT activated
LH side curtain air
bag moduleIf the LH side curtain
air bag has deployed:
REPLACE the LH
side curtain air bag
module. (Repair the
center pillar inner, etc.
before installing new
one if damaged.)If the LH side curtain air bag has NOT deployed:
1. Check for visible signs of damage (dents, tears, deformation) of the center pillar on
the collision side.
2. If damaged—Remove the LH side curtain air bag module.
3. Check for visible signs of damaged (tears etc.) of the LH side curtain air bag mod-
ule.
4. Check harness and connectors for damage, and terminals for deformities.
5. If no damage is found, reinstall the LH side curtain air bag module with new fasten-
ers.
6. If damaged—REPLACE the LH side curtain air bag module with new fasteners.
RH side curtain air
bag moduleIf the RH side curtain
air bag has deployed:
REPLACE the RH
side curtain air bag
module. (Repair the
center pillar inner, etc.
before installing new
one if damaged.)If the RH side curtain air bag has NOT deployed:
1. Check for visible signs of damage (dents, tears, deformation) of the center pillar on
the collision side.
2. If damaged—Remove the RH side curtain air bag module.
3. Check for visible signs of damaged (tears etc.) of the RH side curtain air bag mod-
ule.
4. Check harness and connectors for damage, and terminals for deformities.
5. If no damage is found, reinstall the RH side curtain air bag module with new fasten-
ers.
6. If damaged—REPLACE the RH side curtain air bag module with new fasteners.
Front LH side air bag
moduleIf the front LH side air
bag has deployed:
REPLACE front LH
seatback assembly.If the front LH side air bag has NOT deployed:
1. Check for visible signs of damage (dents, tears, deformation) of the seat back on
the collision side.
2. Check harness and connectors for damage, and terminals for deformities.
3. If damaged—REPLACE the front LH seatback assembly.
Front RH side air bag
moduleIf the front RH side air
bag has deployed:
REPLACE front RH
seatback assembly.If the front RH side air bag has NOT deployed:
1. Check for visible signs of damage (dents, tears, deformation) of the seat back on
the collision side.
2. Check harness and connectors for damage, and terminals for deformities.
3. If damaged—REPLACE the front RH seatback assembly.
(LH or RH) side air
bag (satellite) sensor If any of the SRS
components have
deployed:
REPLACE the side
air bag (satellite) sen-
sor on the collision
side with new fasten-
ers. (Repair the cen-
ter pillar inner, etc.
before installing new
one if damaged.)If none of the SRS components have been activated:
1. Remove the side air bag (satellite) sensor on the collision side. Check harness
connectors for damage, terminals for deformities, and harness for binding.
2. Check for visible signs of damage (dents, cracks, deformation) of the side air bag
(satellite) sensor.
3. Install the side air bag (satellite) sensor to check fit.
4. If no damage is found, reinstall the side sir bag (satellite) sensor with new fasten-
ers.
5. If damaged—REPLACE the side air bag (satellite) sensor with new fasteners.
Diagnosis sensor unit If any of the SRS
components have
deployed:
REPLACE the diag-
nosis sensor unit with
new fasteners.If none of the SRS components have been activated:
1. Check case and bracket for dents, cracks or deformities.
2. Check connectors for damage, and terminals for deformities.
3. If no damage is found, reinstall the diagnosis sensor unit with new fasteners.
4. If damaged—REPLACE the diagnosis sensor unit with new fasteners.

COLLISION DIAGNOSIS
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Revision: June 20062007 Versa
Seat belt pre-ten-
sioner assemblies
(All applicable loca-
tions: buckle, reel, lap
outer)If either the driver or
passenger seat belt
pre-tensioner* has
been activated:
REPLACE all seat
belt pre-tensioner
assemblies with new
fasteners.
*: Confirm seat belt
pre-tensioner activa-
tion using CONSULT-
II only.If the pre-tensioners have NOT been activated:
1. Remove seat belt pre-tensioners.
Check harness cover and connectors for damage, terminals for deformities, and
harness for binding.
2. Check belts for damage and anchors for loose mounting.
3. Check retractor for smooth operation.
4. Check seat belt adjuster for damage.
5. Check for deformities of the center pillar inner.
6. If the center pillar inner has no damage, REPLACE the seat belt pre-tensioner
assembly.
7. If no damage is found, reinstall seat belt pre-tensioner assembly.
8. If damaged—REPLACE. Install the seat belt pre-tensioners with new fasteners.
Seat (with front side
air bag)If either the front LH
or front RH side air
bag modules has
been deployed:
REPLACE front seat-
back assembly on the
deployed side.If the front LH or front RH side air bag modules have NOT deployed:
1. Visually check the seat on the collision side.
2. Remove the seat on the collision side and check the following for damage and
deformities.
–Harness, connectors and terminals
–Frame and recliner (for front and rear seat), and also adjuster and slides (for front
seat)
3. If no damage is found, reinstall the seat.
4. If damaged—REPLACE the damaged seat parts using new fasteners. If the front
seat back is damaged, the front seat back assembly must be replaced.
Center inner pillar 1. Check the center inner pillar on the collision side for damage (dents, cracks, deformation).
2. If damaged—REPAIR the center inner pillar.
Trim/headlining 1. Check for visible signs of damage (dents, cracks, deformation) of the interior trim on the collision side.
2. If damaged—REPLACE the damaged trim parts. Part SRS is activated SRS is NOT activated

SRS-58
COLLISION DIAGNOSIS
Revision: June 20062007 Versa

STC-1
STEERING CONTROL SYSTEM
G STEERING
CONTENTS
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SECTION STC
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STC
Revision: June 20062007 Versa
EPS
PRECAUTIONS .......................................................... 3
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” .................................................................. 3
Precautions Necessary for Steering Wheel Rotation
After Battery Disconnect .......................................... 3
OPERATION PROCEDURE ................................. 3
Service Notice or Precautions for EPS System ....... 4
EPS SYSTEM ............................................................. 5
System Description .................................................. 5
EPS CONTROL UNIT ........................................... 5
EPS MOTOR ......................................................... 5
TORQUE SENSOR ............................................... 5
REDUCTION GEAR .............................................. 5
EPS WARNING LAMP .......................................... 5
System Diagram ....................................................... 6
COMPONENTS FUNCTION DESCRIPTION ....... 6
CAN Communication ................................................ 6
SYSTEM DESCRIPTION ...................................... 6
TROUBLE DIAGNOSIS .............................................. 7
Fail-Safe Function .................................................... 7
How to Perform Trouble Diagnosis .......................... 7
BASIC CONCEPT ................................................. 7
PRECAUTIONS FOR TROUBLE DIAGNOSIS ..... 7
INTERVIEW .......................................................... 7
Component Parts Location ....................................... 8
Wiring Diagram — EPS — ....................................... 9
EPS Control Unit Input/Output Signal Reference
Values .....................................................................11
SPECIFICATIONS WITH CONSULT-II ................11
SPECIFICATIONS BETWEEN EPS CONTROL
UNIT TERMINALS .............................................. 12
CONSULT-II Function (EPS) .................................. 13
FUNCTION .......................................................... 13
CONSULT-II SETTING PROCEDURE ................ 13
SELF-DIAG RESULTS MODE ............................ 13
DATA MONITOR ................................................. 14
EPS CONTROL UNIT PART NUMBER .............. 14
Symptom Chart ...................................................... 15TROUBLE DIAGNOSIS FOR SYSTEM .................... 16
DTC C1601 BATTERY VOLT ................................. 16
CONSULT-II REFERENCE VALUE IN DATA
MONITOR MODE ................................................ 16
EPS CONTROL UNIT TERMINALS AND REF-
ERENCE VALUE ................................................. 16
DIAGNOSTIC PROCEDURE .............................. 17
DTC C1604 TORQUE SENSOR ............................ 19
CONSULT-II REFERENCE VALUE IN DATA
MONITOR MODE ................................................ 19
EPS CONTROL UNIT TERMINALS AND REF-
ERENCE VALUE ................................................. 19
DIAGNOSTIC PROCEDURE .............................. 19
DTC C1606 EPS MOTOR ...................................... 21
CONSULT-II REFERENCE VALUE IN DATA
MONITOR MODE ................................................ 21
EPS CONTROL UNIT TERMINALS AND REF-
ERENCE VALUE ................................................. 21
DIAGNOSTIC PROCEDURE .............................. 21
DTC C1607 EEPROM ............................................ 22
DIAGNOSTIC PROCEDURE .............................. 22
DTC C1608 CONTROL UNIT ................................. 22
DIAGNOSTIC PROCEDURE .............................. 22
DTC C1609 CAN VHCL SPEED ............................ 23
CONSULT-II REFERENCE VALUE IN DATA
MONITOR MODE ................................................ 23
DIAGNOSTIC PROCEDURE .............................. 23
DTC C1610 CAN ENG RPM .................................. 24
CONSULT-II REFERENCE VALUE IN DATA
MONITOR MODE ................................................ 24
DIAGNOSTIC PROCEDURE .............................. 24
DTC U1000 CAN COMM CIRCUIT ........................ 24
DIAGNOSTIC PROCEDURE .............................. 24
Component Inspection ............................................ 25
EPS MOTOR ....................................................... 25
TROUBLE DIAGNOSIS FOR SYMPTOMS .............. 26
EPS Warning Lamp Does Not Turn ON ................. 26
SYMPTOM: ......................................................... 26
DIAGNOSTIC PROCEDURE .............................. 26
EPS Warning Lamp Does Not Turn OFF ................ 27

STC-2Revision: June 20062007 Versa SYMPTOM: .......................................................... 27
DIAGNOSTIC PROCEDURE .............................. 27
Steering Wheel Turning Force is Heavy or Light .... 29
SYMPTOM: .......................................................... 29
DIAGNOSTIC PROCEDURE .............................. 29
Unbalance Steering Wheel Turning Force and
Return Between Right and Left .............................. 31SYMPTOM: ..........................................................31
DIAGNOSTIC PROCEDURE ...............................31
Unbalance Steering Wheel Turning Force (Torque
Variation) .................................................................32
SYMPTOM: ..........................................................32
DIAGNOSTIC PROCEDURE ...............................32

PRECAUTIONS
STC-3
[EPS]
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Revision: June 20062007 Versa
PRECAUTIONSPFP:00001
Precautions for Supplemental Restraint System (SRS) “AIR BAG” and “SEAT
BELT PRE-TENSIONER”
UGS000A8
The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SRS and SB section of this Service Man-
ual.
WA RN ING:

To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death
in the event of a collision which would result in air bag inflation, all maintenance must be per-
formed by an authorized NISSAN/INFINITI dealer.

Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air
Bag Module, see the SRS section.

Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or
harness connectors.
Precautions Necessary for Steering Wheel Rotation After Battery DisconnectUGS000A9
NOTE:

This Procedure is applied only to models with Intelligent Key system and NVIS/IVIS (NISSAN/INFINITI
VEHICLE IMMOBILIZER SYSTEM - NATS).

Remove and install all control units after disconnecting both battery cables with the ignition knob in the
″LOCK″ position.

Always use CONSULT-II to perform self-diagnosis as a part of each function inspection after finishing
work. If DTC is detected, perform trouble diagnosis according to self-diagnostic results.
For models equipped with the Intelligent Key system and NVIS/IVIS, an electrically controlled steering lock
mechanism is adopted on the key cylinder.
For this reason, if the battery is disconnected or if the battery is discharged, the steering wheel will lock and
steering wheel rotation will become impossible.
If steering wheel rotation is required when battery power is interrupted, follow the procedure below before
starting the repair operation.
OPERATION PROCEDURE
1. Connect both battery cables.
NOTE:
Supply power using jumper cables if battery is discharged.
2. Use the Intelligent Key or mechanical key to turn the ignition switch to the ″ACC″ position. At this time, the
steering lock will be released.
3. Disconnect both battery cables. The steering lock will remain released and the steering wheel can be
rotated.
4. Perform the necessary repair operation.
5. When the repair work is completed, return the ignition switch to the ″LOCK″ position before connecting
the battery cables. (At this time, the steering lock mechanism will engage.)
6. Perform a self-diagnosis check of all control units using CONSULT-II.

STC-4
[EPS]
PRECAUTIONS
Revision: June 20062007 Versa
Service Notice or Precautions for EPS SystemUGS0008F
CAUTION:
Check or confirm the following item when performing the trouble diagnosis.

Check any possible causes by interviewing the symptom and it’s condition from the customer if
any malfunction, such as EPS warning lamp turns ON, occurs.

Check if air pressure and size of tires are proper, the specified part is used for the steering wheel,
and control unit is genuine part.

Check if the connection of steering column assembly and steering gear assembly is proper (there
is not looseness of mounting bolts, damage of rods, boots or sealants, and leakage of grease,
etc).

Check if the wheel alignment is adjusted properly.

Check if there is any damage or modification to suspension or body resulting in increased weight
or altered ground clearance.

Check if installation conditions of each link and suspension are proper.

Check if the battery voltage is proper

Check connection conditions of each connector are proper.

Before connecting or disconnecting the EPS control unit
harness connector, turn ignition switch “OFF” and discon-
nect battery ground cable. Because battery voltage is
applied to EPS control unit even if ignition switch is turned
“OFF”.

When connecting or disconnecting pin connectors into or
from EPS control unit, take care not to damage pin termi-
nals (bend or break).
When connecting pin connectors, make sure that there are
no bends or breaks on EPS control unit pin terminal.

Before replacing EPS control unit, perform EPS control unit
input/output signal inspection and make sure whether EPS
control unit functions properly or not. Refer to STC-11,
"EPS Control Unit Input/Output Signal Reference Values" .
SEF 2 89 H
SEF 2 91 H
SDIA1848E