Nissan Altima HL32 Hybrid. Manual - part 1049

SRS-16

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DIAGNOSIS SENSOR UNIT

DIAGNOSIS SENSOR UNIT

Exploded View

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Removal and Installation

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REMOVAL

CAUTION:

• Before servicing, turn ignition switch OFF, disconnect both 12-volt battery terminals and wait at least

3 minutes.

• Before disconnecting the air bag sensor unit harness connector, be sure to disconnect the harness

connector of each air bag module and pre-tensioner seat belt to prevent air bag deployment by static

electricity.

• Do not use air tools or electric tools for servicing.

• Do not use old bolts after removal; replace with new bolts.

• Do not cause an impact to the diagnosis sensor unit by dropping etc. Replace the diagnosis sensor

unit if it has been dropped or sustained an impact.

• Replace the diagnosis sensor unit of deployed SRS air bag and deployed SRS front seat belt pre-ten-

sioner. 

1. Disconnect the 12-volt battery negative and positive terminals, then wait at least 3 minutes.
2. Disconnect connector of each air bag module and seat belt pre-tensioner. Refer to 

SRS-5, "Removal and

Installation"

 (driver air bag module), 

SRS-10, "Removal and Installation"

 (front passenger air bag module),

SRS-12, "Removal and Installation"

 (side curtain air bag module), 

SRS-12, "Removal and Installation"

(front seat belt retractor).

3. Remove the center console. Refer to 

IP-12, "Removal and Installation"

.

4. Disconnect the diagnosis sensor unit harness connectors.
5. Remove the bolts, then remove the diagnosis sensor unit.

INSTALLATION

Installation is in the reverse order of removal.

CAUTION:

• Be careful not to damage the diagnosis sensor unit harness.

• After the work is completed, make sure no system malfunction is detected by air bag warning lamp.

• In case a malfunction is detected by the air bag warning lamp, reset by the self-diagnosis function

and delete the memory by CONSULT

−lIl. 

• If a malfunction is still detected after the above operation, perform self-diagnosis to repair malfunc-

tions. Refer to 

SRC-12, "SRS Operation Check"

.

1.

Diagnosis sensor unit harness con-
nector

2.

Diagnosis sensor unit shield

3.

Diagnosis sensor unit

A.

Diagnosis sensor unit bolts

Vehicle front

AWHIA0014GB

DIAGNOSIS SENSOR UNIT

SRS-17

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SRS

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ECU DISCRIMINATED NO.

After replacing the diagnosis sensor unit, confirm that the diagnosis sensor unit identification is correct for the

vehicle as equipped. Refer to 

SRC-14, "CONSULT-III Function (AIR BAG)"

.

SRS-18

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OCCUPANT CLASSIFICATION SYSTEM CONTROL UNIT

OCCUPANT CLASSIFICATION SYSTEM CONTROL UNIT

Removal and Installation

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The occupant classification system control unit, occupant classification system sensor, and sensor mat are an

integral part of the front passenger seat cushion and are replaced as an assembly. Refer to 

SE-28, "PASSEN-

GER SIDE : Disassembly"

.

COLLISION DIAGNOSIS

SRS-19

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SRS

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COLLISION DIAGNOSIS

For Frontal Collision

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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 

SRC-

12, "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 dam-
age, 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 module

If 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 fas-
teners.

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-
III 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, termi-
nals 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-tension-
er 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 as-
semblies with new 
fasteners.

*: Confirm seat belt 
pre-tensioner activa-
tion using CONSULT-
III 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 com-
ponents 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.