SERVICE INFORMATION FOR ELECTRICAL INCIDENTGI-45
< BASIC INSPECTION >
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Before you begin to diagnose and test the system, you should rough sketch a schematic of the system. This
will help you to logically walk through the diagnosis process. Drawing the sketch will also reinforce your work-
ing knowledge of the system.
Continuity Check Method
The continuity check is used to find an open in the circui t. The digital multimeter (DMM) set on the resistance
function will indicate an open circuit as over limit (no beep tone or no ohms symbol). Make sure to always start
with the DMM at the highest resistance level.
To help in understanding the diagnosis of open circui ts, please refer to the previous schematic.
• Disconnect the battery negative cable.
• Start at one end of the circuit and work your way to the other end. (At the fuse block in this example)
• Connect one probe of the DMM to the fuse block terminal on the load side.
• Connect the other probe to the fuse block (power) side of SW1. Little or no resistance will indicate that por-
tion of the circuit has good continuity. If there were an open in the circuit, the DMM would indicate an over
limit or infinite resistance condition. (point A)
• Connect the probes between SW1 and the relay. Little or no resistance will indicate that portion of the circuit
has good continuity. If there were an open in the circuit, t he DMM would indicate an over limit or infinite resis-
tance condition. (point B)
• Connect the probes between the relay and the solenoid. Little or no resistance will indicate that portion of the
circuit has good continuity. If there were an open in the ci rcuit, the DMM would indicate an over limit or infi-
nite resistance condition. (point C)
Any circuit can be diagnosed using the approach in the previous example.
Voltage Check Method
To help in understanding the diagnosis of open circuits please refer to the previous schematic.
In any powered circuit, an open can be found by methodica lly checking the system for the presence of voltage.
This is done by switching the DMM to the voltage function.
• Connect one probe of the DMM to a known good ground.
• Begin probing at one end of the circuit and work your way to the other end.
• With SW1 open, probe at SW1 to check for voltage.
voltage; open is further down the circuit than SW1.
no voltage; open is between fuse block and SW1 (point A).
• Close SW1 and probe at relay.
voltage; open is further down the circuit than the relay.
no voltage; open is between SW1 and relay (point B).
• Close the relay and probe at the solenoid.
voltage; open is further down the circuit than the solenoid.
no voltage; open is between relay and solenoid (point C).
Any powered circuit can be diagnosed using the approach in the previous example.
TESTING FOR “SHORTS” IN THE CIRCUIT
To simplify the discussion of shorts in the system, please refer to the following schematic.
SGI846-A
SGI847-A
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GI-46
< BASIC INSPECTION >
SERVICE INFORMATION FOR ELECTRICAL INCIDENT
Resistance Check Method
• Disconnect the battery negative cable and remove the blown fuse.
• Disconnect all loads (SW1 open, relay disconnected and solenoid disconnected) powered through the fuse.
• Connect one probe of the DMM to the load side of the fuse terminal. Connect the other probe to a knowngood ground.
• With SW1 open, check for continuity. continuity; short is between fuse terminal and SW1 (point A).
no continuity; short is further down the circuit than SW1.
• Close SW1 and disconnect the relay. Put probes at the load side of fuse terminal and a known good ground. Then, check for continuity.
continuity; short is between SW1 and the relay (point B).
no continuity; short is further down the circuit than the relay.
• Close SW1 and jump the relay contacts with jumper wire. Put probes at the load side of fuse terminal and a known good ground. Then, check for continuity.
continuity; short is between relay and solenoid (point C).
no continuity; check solenoid, retrace steps.
Voltage Check Method
• Remove the blown fuse and disconnect all loads (i.e. SW1 open, relay disconnected and solenoid discon-
nected) powered through the fuse.
• Turn the ignition key to the ON or START position. Verify battery voltage at the battery + side of the fuse ter- minal (one lead on the battery + terminal side of the fuse block and one lead on a known good ground).
• With SW1 open and the DMM leads across both fuse terminals, check for voltage. voltage; short is between fuse block and SW1 (point A).
no voltage; short is further down the circuit than SW1.
• With SW1 closed, relay and solenoid disconnected and the DMM leads across both fuse terminals, check for voltage.
voltage; short is between SW1 and the relay (point B).
no voltage; short is further down the circuit than the relay.
• With SW1 closed, relay contacts jumped with fused jumper wire check for voltage. voltage; short is down the circuit of the relay or between the relay and the disconnected solenoid (point C).
no voltage; retrace steps and check power to fuse block.
GROUND INSPECTION
• Ground connections are very important to the proper operation of electrical and electronic circuits. Ground
connections are often exposed to moisture, dirt and other corrosive elements. The corrosion (rust) can
become an unwanted resistance. This unwanted resistance can change the way a circuit works.
• Electronically controlled circuits are very sens itive to proper grounding. A loose or corroded ground can
drastically affect an electronically controlled circuit. A poor or corroded ground can easily affect the circuit.
Even when the ground connection looks clean, there c an be a thin film of rust on the surface.
• When inspecting a ground connection follow these rules:
- Remove the ground bolt or screw.
- Inspect all mating surfaces for tarnish, dirt, rust, etc.
- Clean as required to assure good contact.
- Reinstall bolt or screw securely.
- Inspect for “add-on” accessories which may be interfering with the ground circuit.
- If several wires are crimped into one ground eyelet terminal, check for proper crimps. Make sure all of the
wires are clean, securely fastened and providing a good ground path. If multiple wires are cased in one eye-
let make sure no ground wires have excess wire insulation.
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SQUEAK AND RATTLE TROUBLE DIAGNOSESGW-7
< SYMPTOM DIAGNOSIS >
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INSTRUMENT PANEL
Most incidents are caused by contact and movement between:
1. Cluster lid A and the instrument panel
2. Acrylic lens and combination meter housing
3. Instrument panel to front pillar finisher
4. Instrument panel to windshield
5. Instrument panel pins
6. Wiring harnesses behind the combination meter
7. A/C defroster duct and duct joint
These incidents can usually be located by tapping or moving the components to duplicate the noise or by
pressing on the components while driving to stop the noi se. Most of these incidents can be repaired by apply-
ing felt cloth tape or silicone spray (in hard to reach areas). Urethane pads can be used to insulate wiring har-
ness.
CAUTION:
Do not use silicone spray to isolate a squeak or ra ttle. If you saturate the area with silicone, you will
not be able to recheck the repair.
CENTER CONSOLE
Components to pay attention to include:
1. Shift selector assembly cover to finisher
2. A/C control unit and cluster lid C
3. Wiring harnesses behind audio and A/C control unit
The instrument panel repair and isolation pr ocedures also apply to the center console.
DOORS
Pay attention to the:
1. Finisher and inner panel making a slapping noise
2. Inside handle escutcheon to door finisher
3. Wiring harnesses tapping
4. Door striker out of alignment causing a popping noise on starts and stops
Tapping or moving the components or pressing on them while driving to duplicate the conditions can isolate
many of these incidents. You can usually insulate the ar eas with felt cloth tape or insulator foam blocks from
the NISSAN Squeak and Rattle Kit (J-50397) to repair the noise.
TRUNK
Trunk noises are often caused by a loose jack or loose items put into the trunk by the owner.
In addition look for:
1. Trunk lid bumpers out of adjustment
2. Trunk lid striker out of adjustment
3. The trunk lid torsion bars knocking together
4. A loose license plate or bracket
Most of these incidents can be repaired by adjusting, se curing or insulating the item(s) or component(s) caus-
ing the noise.
SUNROOF/HEADLINING
Noises in the sunroof/headlining area can often be traced to one of the following:
1. Sunroof lid, rail, linkage or seals making a rattle or light knocking noise
2. Sun visor shaft shaking in the holder
3. Front or rear windshield touching headlining and squeaking
Again, pressing on the components to stop the noise while duplicating the conditions can isolate most of these
incidents. Repairs usually consist of insulating with felt cloth tape.
OVERHEAD CONSOLE (FRONT AND REAR)
Overhead console noises are often caused by the cons ole panel clips not being engaged correctly. Most of
these incidents are repaired by pushing up on the c onsole at the clip locations until the clips engage.
In addition look for:
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OPERA WINDOWGW-15
< REMOVAL AND INSTALLATION >
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When cutting glass from the vehicle, always wear safety glasses and heavy gloves to prevent
glass splinters from entering your eyes or cutting your hands.
CAUTION:
• Be careful not to scratch the glass when removing.
• Do not set or stand the glass on its ed ge. Small chips may develop into cracks.
• Apply protective tape around the opera windo w glass to protect the painted surface from dam-
age.
INSTALLATION
• Use a Genuine NISSAN Urethane Adhesive Kit (if avail able) or equivalent and follow the instructions fur-
nished with it.
• Adhesive shall be continuously applied to assure watert ightness. Glass installation shall be finished within
five minutes after applying the adhesive.
• The start and finisher of the urethane adhesive applicati on should be located at the bottom to assure water-
tightness.
• While the urethane adhesive is curing, open a door window . This will prevent the glass from being forced out
by passenger compartment air pressure when a door is closed.
• Inform the customer that the vehicle should rema in stationary until the urethane adhesive has completely
cured (preferably 24 hours). Curing time varies with temperature and humidity.
WARNING:
• Keep heat and open flames away as primers and adhesive are flammable.
• The materials contained in the kit are harmful if swallowed, and may irritate skin and eyes. Avoid
contact with skin and eyes.
• Use in an open, well ventilated lo cation. Avoid breathing the vapors. They can be harmful if inhaled.
If affected by vapor inhalation, imme diately move to an area with fresh air.
• Driving the vehicle before the urethane adhesive is completely cured may affect the performance of
the opera window glass in case of an accident.
CAUTION:
• Do not use an adhesive which is past its usable te rm. Shelf life of this product is limited to six
months after the date of manufacture. Carefully ad here to the expiration or manufacture date printed
on the box.
• Keep primers and adhesive in a cool, dry place. Id eally, they should be stored in a refrigerator.
• Do not leave primers or adhesive cartridge unattended with their caps open or off.
• The vehicle should not be driven for at least 24 hours or until the urethane adhesive is completely
cured. Curing time varies depe nding on temperature and humidity. The curing time increases under
lower temperature and lower humidity.
REPAIRING WATER LEAKS FOR OPERA WINDOW GLASS
• Leaks can be repaired without removing and reinstalling opera window glass.
• If water is leaking between the urethane adhesive materi al and body or glass, determine the extent of the
leak.
• This can be done by applying water to the opera window glass area while pushing glass outward.
• To stop the leak, apply primer (if necessary ) and then urethane adhesive to the leak point.
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SIDE WINDOW GLASSGW-17
< REMOVAL AND INSTALLATION >
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Removal and InstallationINFOID:0000000012430535
REMOVAL
1. Remove luggage side upper finisher. Refer to INT-35, "LUGGAGE SIDE UPPER FINISHER : Removal
and Installation".
2. Remove the side window glass using piano wire or power cutting tool (A) and an inflatable pump bag (B).
WARNING:
When cutting glass from the vehicle, always wear safety glasses and heavy gloves to prevent
glass splinters from entering your eyes or cutting your hands.
CAUTION:
• Be careful not to scratch the glass when removing.
• Do not set or stand the glass on its ed ge. Small chips may develop into cracks.
• Apply protective tape around the side window gl ass to protect the painted surface from damage.
INSTALLATION
• Use a Genuine NISSAN Urethane Adhesive Kit (if avail able) or equivalent and follow the instructions fur-
nished with it.
• Adhesive shall be continuously applied to assure watert ightness. Glass installation shall be finished within
five minutes after applying the adhesive.
• The start and finisher of the urethane adhesive applicati on should be located at the bottom to assure water-
tightness.
• While the urethane adhesive is curing, open a door window . This will prevent the glass from being forced out
by passenger compartment air pressure when a door is closed.
• Inform the customer that the vehicle should rema in stationary until the urethane adhesive has completely
cured (preferably 24 hours). Curing time varies with temperature and humidity.
WARNING:
• Keep heat and open flames away as primers and adhesive are flammable.
• The materials contained in the kit are harmful if swallowed, and may irritate skin and eyes. Avoid
contact with skin and eyes.
• Use in an open, well ventilated lo cation. Avoid breathing the vapors. They can be harmful if inhaled.
If affected by vapor inhalation, imme diately move to an area with fresh air.
• Driving the vehicle before the urethane adhesive is completely cured may affect the performance of
the side window glass in case of an accident.
CAUTION:
• Do not use an adhesive which is past its usable te rm. Shelf life of this product is limited to six
months after the date of manufacture. Carefully ad here to the expiration or manufacture date printed
on the box.
• Keep primers and adhesive in a cool, dry place. Id eally, they should be stored in a refrigerator.
• Do not leave primers or adhesive cartridge unattended with their caps open or off.
• The vehicle should not be driven for at least 24 hours or until the urethane adhesive is completely
cured. Curing time varies depe nding on temperature and humidity. The curing time increases under
lower temperature and lower humidity.
REPAIRING WATER LEAKS FO R SIDE WINDOW GLASS
• Leaks can be repaired without removing and reinstalling side window glass.
• If water is leaking between the urethane adhesive materi al and body or glass, determine the extent of the
leak.
F. 24.0 mm (0.94 in) G. 12.0 mm (0.47 in)H. 7.0 mm (0.28 in)
Clip
PIIB5779E
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HAC-10
< SYSTEM DESCRIPTION >[MANUAL AIR CONDITIONING]
COMPONENT PARTS
A. LH side of instrument panel B. Behind center of instrument panel C. Center of instrument panel
No. Component Description
1. BCM The BCM receives the fan ON and A/C ON signals from the front air control and sends a com-
pressor ON request to the ECM.
2. Fuse Block (J/B) Located in the passenger compartment, behind the left lower IP, the Fuse Block (J/B) con-
tains the front blower motor relay and several fuses required for the air conditioner control
system.
3. Blower relay The blower relay controls the flow of current to fuse 20, 21 and 22 in the Fuse Block (J/B).
The relay is connected directly to ground, and is energized when the ignition switch is in the
ON or START position.
4. Front blower motor The front blower motor varies the speed at which the air flows through the ventilation system.
5. Front blower motor resistor Ground for the blower is supplied through blower resistor and the blower speed switch. As
the switch is moved from position 1 through 4, more current is allowed to flow through the
motor, for a higher speed. This is because less resistors are in the path as the switch is
moved to a higher position. When the switch is on the highest position, all resistors are by-
passed.
6. Thermo control amp. Thermo control amp. is composed of thermistor and amplifier. When the A/C switch signal is
received from the front air control, the thermo control amp. transmits the A/C ON signal to the
BCM according to evaporator fin temperature. When the thermistor detecting temperature of
the air that passes through evaporator is extremely low, the thermo control amp. sends the
A/C OFF signal to BCM, and stops the compressor.
7. Front air control The front air control controls the operation of the A/C and heating system.
AWIIA1862ZZ
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SYSTEMHAC-13
< SYSTEM DESCRIPTION > [MANUAL AIR CONDITIONING]
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Low Temperature Protection Control
• When thermo control amp. detects
that evaporator fin temperature
is 1.5° C (35° F) or less, thermo control amp. switches A/C ON sig-
nal to OFF and stops the compressor.
When the evaporator fin temperature returns to 3 °C (37° F) or
more, the compressor is activated.
CONTROL BY ECM
Refrigerant Pressure Protection
The refrigerant system is protected against excessively high- or low-pressures by the refrigerant pressure s\
en-
sor, located on the liquid tank on the condenser. The refr igerant pressure sensor detects the pressure inside
the refrigerant line and sends a voltage signal to the ECM. If the system pressure rises above or falls below
the following values, the ECM requests the IPDM E/ R to de-energize the A/C relay and disengage the com-
pressor.
• 3.12 MPa (31.82 kg/cm
2, 452.4 psi) or more (When the engine speed is less than 1,500 rpm)
• 2.74 MPa (27.95 kg/cm
2, 397.3 psi) or more (When the engine speed is 1,500 rpm or more)
• 0.14 MPa (1.43 kg/cm
2, 20.3 psi) or less
Compressor Oil Cir culation Control
When the engine starts while the engine coolant temperature is 56 °C (133° F) or less, ECM activates the com-
pressor for approximately 6 seconds and circulates the compressor oil once.
Air Conditioning Cut Control
When the engine is under a high load condition, the ECM transmits an A/C relay OFF request to IPDM E/R,
and stops the compressor. Refer to EC-37, "
AIR CONDITIONING CUT CONTROL : System Description".
Door ControlINFOID:0000000012430719
SWITCHES AND THEIR CONTROL FUNCTIONS
JMIIA1228GB
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REFRIGERANTHA-19
< PERIODIC MAINTENANCE >
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4. Press UV lamp switch (5) and check A/C system for re frigerant leaks. (Where refrigerant leaks occur, flu-
orescent leak detection dye appears green in color.)
WARNING:
Do not look directly into UV lamp light source.
NOTE:
• For continuous operating time of UV lamp, fo llow the manufacturer’s operating instructions.
• Illuminate pipe joints from different angles using UV lamp to check for leaks.
• Use a mirror in areas that are di fficult to see to check for leaks.
• Refrigerant leaks from the evaporator can be detected by soaking a cotton swab or similar material with
drain hose water and illuminating it using the UV lamp.
• Dust, dirt, and packing material adhesives used for condenser, evaporator, and other components may fluoresce. Be careful not to misidentify leaks.
5. Repair or replace parts where refrigerant lea ks occur and wipe off fluorescent leak detection dye.
NOTE:
Completely wipe off fluorescent leak detection dye from gaps between parts, screw threads, and other
components using a cotton swab or similar material.
6. Use a UV lamp to check that no fluorescent leak detection dye remains after finishing work. WARNING:
Do not look directly into UV lamp light source.
NOTE:
• For continuous operating time of UV lamp, fo llow the manufacturer’s operating instructions.
• Dust, dirt, and packing material adhesives used for condenser, evaporator, and other components may
fluoresce. Be careful not to misidentify leaks.
CHECK REFRIGERANT LEAKS USING ELECTRONIC LEAK DETECTOR
WARNING:
Do not check for refrigerant leaks while the engine is running.
CAUTION:
Be careful of the following items so that in accurate checks or misidentifications are avoided.
• Do not allow refrigerant vapor, shop chemical vapors, cigarette smoke or other contaminates around the vehicle.
• Always check refrigerant leaks in a low air flow en vironment so that refrigerant may not disperse.
1. Stop the engine.
2. Connect recovery/recycling/recharging equipment or manifold gauge set to the A/C service valves.
3. Check that A/C refrigerant pressure is 345 kPa (3.52 kg/cm
2, 50 psi) or more when temperature is 16 °C
(61 °F) or more. When pressure is lower than the specified value, recycle refrigerant completely and
recharge refrigerant to the specified level.
NOTE:
Leaks may not be detected if A/C refriger ant pressure is 345 kPa (3.52 kg/cm
2, 50 psi) or less when tem-
perature is less than 16° C (61°F).
4. Clean the area where the refrigerant leak check is performed and check for refrigerant leaks along all sur- faces of pipe connections and A/C system co mponents using electronic leak detector probe.
CAUTION:
• Continue checking once leaks are found. Always co ntinue and complete checking along all pipe
connections and A/C system comp onents for additional leaks.
• When leaks are detected, clean leak ar ea using compressed air and re-check.
• When checking the evaporator for leaks, always clean inside of drain hose so that the probe sur-
face may not be exposed to water or dirt.
NOTE:
• Always check for leaks starting from the high-pressure side and continue to the low-pressure side.
• When checking the evaporator for leaks, operate blower motor for 15 minut\
es or more at the maximum speed while the engine is stopped. Insert electronic leak detector probe into drain hose and hold for 10
minutes or more.
• When disconnecting shut-off valve that is connected to A/C service valve, always evacuate remaining
refrigerant so that misidentification can be avoided.
5. Repair or replace parts where refrigerant leaks occur.
6. Start the engine and set A/C control in the following conditions. • A/C switch: ON
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