Nissan Maxima Service and Repair Manual: Precaution
PRECAUTIONS
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and
"SEAT BELT PRE-TENSIONER"
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 SR and SB section of this Service Manual.
WARNING:
- 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 performed by
an authorized NISSAN/INFINITI dealer.
- Improper maintenance, including incorrect removal and
installation of the SRS, can lead to personal injury caused by
unintentional activation of the system. For removal of Spiral Cable and Air
Bag Module, see the SR 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 WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS
WARNING:
- When working near the Airbag Diagnosis Sensor Unit or other
Airbag System sensors with the Ignition ON or engine running, DO NOT use
air or electric power tools or strike near the sensor(s) with a hammer.
Heavy vibration could activate the sensor(s) and deploy the air bag(s),
possibly causing serious injury.
- When using air or electric power tools or hammers, always
switch the Ignition OFF, disconnect the battery and wait at least 3
minutes before performing any service.
Precaution for Work
- When removing or disassembling each component, be careful not to damage
or deform it. If a component may be subject to interference, be sure to
protect it with a shop cloth.
- When removing (disengaging) components with a screwdriver or
similar tool, be sure to wrap the component with a shop cloth or vinyl
tape to protect it.
- Protect the removed parts with a shop cloth and prevent them from being
dropped.
- Replace a deformed or damaged clip.
- If a part is specified as a non-reusable part, always replace it
with a new one.
- Be sure to tighten bolts and nuts securely to the specified torque.
- After installation is complete, be sure to check that each part works
properly.
- Follow the steps below to clean components:
- Water soluble dirt:
- Dip a soft cloth into lukewarm water, wring the water out of the
cloth and wipe the dirty area.
- Then rub with a soft, dry cloth.
- Oily dirt:
- Dip a soft cloth into lukewarm water with mild detergent
(concentration: within 2 to 3%) and wipe the dirty area.
- Then dip a cloth into fresh water, wring the water out of the
cloth and wipe the detergent off.
- Then rub with a soft, dry cloth.
- Do not use organic solvent such as thinner, benzene, alcohol or gasoline.
- For genuine leather seats, use a genuine leather seat cleaner.
Precaution for Procedure without Cowl Top Cover
When performing the procedure after removing cowl top cover, cover the
lower end of windshield with urethane, etc to prevent damage to windshield
Precautions For Refrigerant System Service
WORKING WITH HFC-134a (R-134a)
CAUTION:
- CFC-12 (R-12) refrigerant and HFC-134a (R-134a) refrigerant
are not compatible. Compressor malfunction is likely to occur if the
refrigerants are mixed, refer to "CONTAMINATED REFRIGERANT" below. To
determine the purity of HFC-134a (R-134a) in the vehicle and recovery tank,
use Refrigerant recovery/recycling recharging equipment and Refrigerant
Identifier.
- Use only specified oil for the HFC-134a (R-134a) A/C system
and HFC-134a (R-134a) components.
Compressor malfunction is likely to
occur if oil other than that specified is used.
- The specified HFC-134a (R-134a) oil rapidly absorbs moisture
from the atmosphere. The following handling precautions must be observed:
- Cap (seal) the component immediately to minimize the entry of
moisture from the atmosphere when removing refrigerant components from a
vehicle.
- Do not remove the caps (unseal) until just before connecting
the components when installing refrigerant components to a vehicle.
Connect all refrigerant loop components as quickly as possible to
minimize the entry of moisture into system.
- Use only the specified oil from a sealed container. Reseal
containers of oil immediately. Oil becomes moisture saturated and should
not be used without proper sealing.
- Do not allow oil to come in contact with styrene foam parts.
Damage may result.
GENERAL REFRIGERANT PRECAUTION
WARNING:
- Do not breathe A/C refrigerant and oil vapor or mist. Exposure
may irritate eyes, nose and throat.
Remove HFC-134a (R-134a) from the A/C
system, using certified service equipment meeting requirements of SAE
J-2210 [HFC-134a (R-134a) recycling equipment] or J-2209 [HFC-134a (R-134a)
recovery equipment]. Ventilate work area before resuming service if
accidental system discharge occurs.
Additional health and safety
information may be obtained from refrigerant and oil manufacturers.
- Do not release refrigerant into the air. Use approved
recovery/recycling recharging equipment to capture the refrigerant each
time an air conditioning system is discharged.
- Always wear eye and hand protection (goggles and gloves) when
working with any refrigerant or air conditioning system.
- Do not store or heat refrigerant containers above 52C
(126F).
- Do not heat a refrigerant container with an open flame; Place
the bottom of the container in a warm pail of water if container warming
is required.
- Do not intentionally drop, puncture or incinerate refrigerant
containers.
- Do not refrigerant away from open flames; poisonous gas is
produced if refrigerant burns.
- Refrigerant displaces oxygen; therefore be certain to work in
well ventilated areas to prevent suffocation.
- Do not pressure test or leakage test HFC-134a (R-134a) service
equipment and/or vehicle air conditioning systems with compressed air
during repair. Some mixtures of air and HFC-134a (R-134a) have been shown
to be combustible at elevated pressures. These mixtures, if ignited, may
cause injury or property damage. Additional health and safety information
may be obtained from refrigerant manufacturers.
O-RING AND REFRIGERANT CONNECTION
- Heater and cooling unit assembly
- High-pressure pipe
- High-pressure A/C service valve
- High-pressure flexible hose
- Air deflector (RH)
- Junction pipe
- Condenser
- Liquid tank
- Refrigerant pressure sensor
- Condenser, liquid tank and refrigerant pressure sensor
- Air deflector (LH)
- Compressor
- Low-pressure flexible hose
- Low-pressure A/C service valve
- Low-pressure pipe
- High-pressure pipe to heater and
cooling unit assembly
- High-pressure flexible hose to compressor
- Low-pressure flexible hose to compresso
A new type of refrigerant connection has been introduced to all refrigerant
lines except the following locations:
- Expansion valve to evaporator
- Refrigerant pressure sensor to liquid tank
WARNING: Check that all refrigerant is
discharged into the recycling equipment and the pressure in the system is
less than atmospheric pressure. Then gradually loosen the discharge side hose
fitting and remove it.
CAUTION: Observe the following when
replacing or cleaning refrigerant cycle components.
- Store it in the same way as it is when mounted on the vehicle
when the compressor is removed. Failure to do so will cause oil to enter
the low-pressure chamber.
- Always use a torque wrench and a back-up wrench when
connecting tubes.
- Immediately plug all openings to prevent entry of dust and
moisture after disconnecting tubes.
- Connect the pipes at the final stage of the operation when
installing an air conditioner in the vehicle.
Do not remove the seal caps
of pipes and other components until just before required for connection
- Allow components stored in cool areas to warm to working area
temperature before removing seal caps. This prevents condensation from
forming inside A/C components.
- Remove moisture thoroughly from the refrigeration system
before charging the refrigerant.
- Always replace used O-rings.
- Apply oil to circle of the O-rings shown in illustration when
connecting tube. Be careful not to apply oil to threaded portion.
- O-ring must be closely attached to the groove portion of tube.
- Be careful not to damage O-ring and tube when replacing the
O-ring.
- Connect tube until a click can be heard. Then tighten the nut
or bolt by hand. Check that the O-ring is installed to tube correctly.
- Perform leakage test and make sure that there is no leakage
from connections after connecting line.
Disconnect that line and replace
the O-ring when the refrigerant leaking point is found. Then tighten
connections of seal seat to the specified torque.
CONTAMINATED REFRIGERANT
Take appropriate steps shown below if a refrigerant other than pure HFC-134a
(R-134a) is identified in a vehicle:
- Explain to the customer that environmental regulations prohibit the
release of contaminated refrigerant into the atmosphere.
- Explain that recovery of the contaminated refrigerant could damage
service equipment and refrigerant supply
- Suggest the customer return the vehicle to the location of
previous service where the contamination may have occurred.
- In case of repairing, recover the refrigerant using only dedicated
equipment and containers. Do not recover contaminated refrigerant into
the existing service equipment. Contact a local refrigerant product
retailer for available service if the facility does not have dedicated
recovery equipment. This refrigerant must be disposed of in accordance
with all federal and local regulations. In addition, replacement of all
refrigerant system components on the vehicle is recommended.
- The air conditioner warranty is void if the vehicle is within the
warranty period. Please contact Nissan Customer Affairs for further
assistance.
COMPRESSOR
CAUTION:
- Plug all openings to prevent moisture and foreign matter from
entering.
- Store it in the same way as it is when mounted on the car when
the compressor is removed.
- Follow "Maintenance of Oil Quantity in Compressor" exactly
when replacing or repairing compressor.
Refer to HA-30, "Description".
- Keep friction surfaces between clutch and pulley clean. Wipe
it off by using a clean waste cloth moistened with thinner if the surface
is contaminated with oil.
- Turn the compressor shaft by hand more than five turns in both
directions after compressor service operation. This distributes oil
equally inside the compressor. Let the engine idle and operate the
compressor for one hour after the compressor is installed.
- Apply voltage to the new one and check for normal operation
after replacing the compressor magnet clutch.
LEAK DETECTION DYE
CAUTION:
- The A/C system contains a fluorescent leak detection dye used
for locating refrigerant leakages. An ultraviolet (UV) lamp is required
to illuminate the dye when inspecting for leakages.
- Always wear fluorescence enhancing UV safety goggles to
protect eyes and enhance the visibility of the fluorescent dye.
- The fluorescent dye leak detector is not a replacement for an
electrical leak detector (SST: J-41995).
The fluorescent dye leak
detector should be used in conjunction with an electrical leak detector
(SST: J-41995) to pin-point refrigerant leakages.
- Read and follow all manufacture's operating instructions and
precautions prior to performing the work for the purpose of safety and
customer's satisfaction.
- A compressor shaft seal should not necessarily be repaired
because of dye seepage. The compressor shaft seal should only be repaired
after confirming the leakage with an electrical leak detector (SST:
J-41995).
- Always remove any remaining dye from the leakage area after
repairs are completed to avoid a misdiagnosis during a future service.
- Do not allow dye to come into contact with painted body panels
or interior components. Clean immediately with the approved dye cleaner
if dye is spilled. Fluorescent dye left on a surface for an extended
period of time cannot be removed.
- Do not spray the fluorescent dye cleaning agent on hot
surfaces (engine exhaust manifold, etc.).
- Do not use more than one refrigerant dye bottle [1/4 ounce
(7.4 cc)] per A/C system.
- Leak detection dyes for HFC-134a (R-134a) and CFC-12 (R-12)
A/C systems are different. Do not use HFC-134a (R-134a) leak detection
dye in CFC-12 (R-12) A/C system or CFC-12 (R-12) leak detection dye in
HFC-134a (R-134a) A/C system or A/C system damage may result.
- The fluorescent properties of the dye remains for three or
more years unless a compressor malfunction occurs.
NOTE:
Identification
- Vehicles with factory installed fluorescent dye have a green
label.
- Vehicles without factory installed fluorescent dye have a blue
label.
Service Equipment
RECOVERY/RECYCLING RECHARGING EQUIPMENT
Be certain to follow the manufacturer's instructions for machine operation
and machine maintenance. Do not introduce any refrigerant other than that
specified into the machine.
ELECTRICAL LEAK DETECTOR
Be certain to follow the manufacturer's instructions for tester operation and
tester maintenance.
VACUUM PUMP
The oil contained inside the vacuum pump is not compatible with the
specified oil for HFC-134a (R-134a) A/C systems. The vent side of the vacuum
pump is exposed to atmospheric pressure, so the vacuum pump oil may migrate
out of the pump into the service hose.
This is possible when the pump is
switched OFF after evacuation (vacuuming) and hose is connected to it.
To
prevent this migration, use a manual valve placed near the hoseto- pump
connection, as per the following.
MANIFOLD GAUGE SET
Be certain that the gauge face indicates HFC-134a or R-134a. Be sure the
gauge set has 1/2″-16 ACME threaded connections for service hoses. Confirm
the set has been used only with refrigerant HFC-134a (R-134a) and specified
oils.
SERVICE HOSES
Be certain that the service hoses display the markings described (colored
hose with black stripe). All hoses must equip positive shutoff devices
(either manual or automatic) near the end of the hoses opposite to the
manifold gauge.
SERVICE COUPLERS
Do not attempt to connect HFC-134a (R-134a) service couplers to the CFC-12
(R-12) A/C system. The HFC-134a (R-134a) couplers do not properly connect to
the CFC-12 (R-12) system. However, if an improper connection is attempted,
discharging and contamination may occur.
REFRIGERANT WEIGHT SCALE
Verify that no refrigerant other than HFC-134a (R-134a) and specified oils
have been used with the scale. The hose fitting must be 1/ 2″-16 ACME if the
scale controls refrigerant flow electronically
CHARGING CYLINDER
Using a charging cylinder is not recommended. Refrigerant may be vented into
air from cylinder's top valve when filling the cylinder with refrigerant.
Also, the accuracy of the cylinder is generally less than that of an
electronic scale or of quality recycle/recharge equipment.
PREPARATION
Special Service Tool
The actual shapes of the tools may differ from those illustrated here.
HFC-134a (R-134a) Service Tool and Equipment
Do not mix HFC-134a (R-134a) refrigerant an ...
Other materials:
Power supply and ground circuit
BCM (BODY CONTROL MODULE)
BCM (BODY CONTROL MODULE) : Diagnosis Procedure
1. CHECK FUSE AND FUSIBLE LINK
Check if the following BCM fuses or fusible link are blown.
2. CHECK POWER SUPPLY CIRCUIT
Turn ignition switch OFF.
Disconnect BCM.
Check voltage between BCM harness connector and ...
Unlocking doors
1. Carry the Intelligent Key.
2. Push the door handle request switch.
3. The door on which the request switch was
pressed will unlock and the hazard warning
lights flash once, the outside buzzer sounds
once, and the front and tail lights will turn on
for 30 seconds.
4. Push the door ...
Climate controlled seat switches (if so equipped)
The climate controlled seat warms up or cools
down the front seat by blowing warm or cool air
from under the surface of the seat. The climate
control switch is located on the center console.
The climate controlled seat can be operated as
follows:
1. Start the engine.
2. Turn the contr ...