2007 NISSAN LATIO sensor

OCCUPANT CLASSIFICATION SYSTEM CONTROL UNIT
SRS-53
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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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SRS
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.

STC-1
STEERING CONTROL SYSTEM
G STEERING
CONTENTS
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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

EPS SYSTEM
STC-5
[EPS]
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Revision: June 20062007 Versa
EPS SYSTEMPFP:28500
System DescriptionUGS000A5
EPS CONTROL UNIT

EPS control unit performs an arithmetical operation on data,
such as steering wheel turning force (sensor signal) from the
torque sensor, vehicle speed signal, etc. Then it generates an
optimum assist torque to the EPS motor according to the driving
condition.

EPS control unit decreases the output to EPS motor while
extremely using the power steering function (e.g., full steering)
for protecting EPS motor and EPS control unit (Protect overload
status). While activating protect overload status, the assist
torque gradually decreases, and the steering wheel turning force
becomes heavy. The normal assist torque reactivates by not
steering.

In case of an error in the electrical system, the fail-safe function stops output signals to the EPS motor.
Then the previous state is changed to the manual steering state.

Self-diagnosis can be done with CONSULT-II.
EPS MOTOR
EPS motor provides the assist torque by control signal from EPS control unit.
TORQUE SENSOR
Torque sensor detects the steering torque, and transmit the signal to
EPS control unit.
REDUCTION GEAR
Reduction gear increases the assist torque provided from EPS motor with worm gears, and outputs to the col-
umn shaft.
EPS WARNING LAMP
Turns ON when there is a malfunction in EPS system. It indicates that fail-safe mode is engaged and enters a
manual steering state (Control turning force steering wheel becomes heavy).
Also turns ON when ignition switch is turned ON, for purpose of lamp check. Turns OFF after the engine starts
if system is normal.
EPS Warning Lamp Indication
SGIA1647E
SGIA1648E
Condition EPS warning lamp
Lamp checkTurns ON when ignition switch is turned ON.
Turns OFF after engine start.
EPS system malfunctionON
Other than above (system normal) OFF

STC-6
[EPS]
EPS SYSTEM
Revision: June 20062007 Versa
System DiagramUGS000A6
COMPONENTS FUNCTION DESCRIPTION
CAN CommunicationUGS000A7
SYSTEM DESCRIPTION
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during operation (not independent). In CAN communication, control units are connected with 2
communication lines (CAN-H line, CAN-L line) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads required data only.
For details, refer to LAN-47, "
CAN System Specification Chart" .
WGIA0187E
Component parts Function
EPS control unit
(Electric power steering control unit)

Outputs optimum assist torque signal to EPS motor.

Reduces output signals to EPS motor and protects EPS motor and EPS control unit when
using power steering continuously and excessively.

As a fail-safe function, turned off output signal to EPS motor and then enters a manual steer-
ing state, if malfunction is detected in EPS system.
EPS motor Products assist torque by control signal from EPS control unit.
Torque sensor Detects steering wheel turning force and outputs sensor signal to EPS control unit.
Reduction gear Increases motor-produced assist torque by worm gear and transmits it to column shaft.
EPS warning lamp Illuminates if malfunction is detected in electrical system of EPS system.
ECMTransmits the following signals via CAN communication to EPS control unit.

Engine status signal
ABS actuator and electric unit (con-
trol unit) (With ABS)Transmits the following signals via CAN communication to EPS control unit.

Vehicle speed signal
Combination meterTransmits the following signals via CAN communication to EPS control unit.

Vehicle speed signal
TCM (Without ABS)Transmits the following signals via CAN communication to EPS control unit.

Vehicle speed signal

TROUBLE DIAGNOSIS
STC-11
[EPS]
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Revision: June 20062007 Versa
EPS Control Unit Input/Output Signal Reference ValuesUGS0007X
SPECIFICATIONS WITH CONSULT-II
CAUTION:
The output signal indicates the EPS control unit calculation date. The normal values will be displayed
even in the event that the output circuit (harness) is open.
*1 : In the front of the value, “L” is displayed at steering left and “R” is displayed at steering right.
*2 : Almost in accordance with the value of “MOTOR SIG”. It is not a malfunction though these values are not accorded when steering
quickly.
*3 : It is not a malfunction, though it might not be corresponding just after ignition switch is turned ON.
*4 : It turns to OFF after waiting for a short period of time.Monitor item (Unit) Content Condition Display value
MOTOR VOL (V)Power supply voltage for
EPS control unitIgnition switch: ON Battery voltage
TORQUE SENSOR (Nm)Steering wheel turning
forceEngine runningSteering wheel: Not
steering (There is no
steering force) 0.00 Nm
Steering wheel: Steer-
ing0 – 8.19 Nm
*1 (The value
is changed according to
steering left or right)
MOTOR SIG (A)Command current to EPS
motorEngine runningSteering wheel: Not
steering (There is no
steering force)0.00 A
Steering wheel: Steer-
ing0 – 65.00 A (The value is
changed according to
steering left or right)
MOTOR CURRENT (A)Consumption current of
EPS motorEngine runningSteering wheel: Not
steering (There is no
steering force)0.00 A
Steering wheel: Steer-
ing0 – 65.00 A
*2 (The value
is changed according to
steering left or right)
VEHICLE SPEED (km/h) or (mph) Vehicle speedVehicle stopped 0 km/h (0 mph)
While drivingApproximately equal to
the indication on speed-
ometer (Inside of ±10%)
*3
WARNING LAMP (ON/OFF)EPS warning lamp condi-
tionEPS warning lamp: ON ON
EPS warning lamp: OFF OFF
DERATING STAT (ON/OFF) Protect overload status Engine runningSteering wheel: Nor-
mal steeringOFF
Steering wheel: Steer-
ing over the stopON
*4
ENGINE STATUS (RUN/STOP) Engine statusEngine stopped
(Engine speed: Less than 400 rpm)STOP
Engine running
(Engine speed: 400 rpm or more)RUN