Ccu NISSAN TEANA 2008 Service Manual

DIAGNOSIS AND REPAIR WORK FLOW
SE-5
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BASIC INSPECTION
DIAGNOSIS AND REPAIR WORK FLOW
Work FlowINFOID:0000000003809297
DETAILED FLOW
1.OBTAIN INFORMATION ABOUT SYMPTOM
Interview the customer to obtain as much information as possible about the malfunction (conditions and envi-
ronment when the malfunction occurred) when the customer brings the vehicle in.
>> GO TO 2.
2.REPRODUCE THE MALFUNCTION INFORMATION
Check the malfunction on the vehicle that the customer describes.
Inspect the relation of the symptoms and the condition when the symptoms occur.
>> GO TO 3.
3.IDENTIFY THE MALFUNCTIONING SYSTEM WITH “SYMPTOM DIAGNOSIS”
Use “Symptom diagnosis” from the symptom inspection result in step 2 and then identify where to start per-
forming the diagnosis based on possible causes and symptoms.
>> GO TO 4.
4.IDENTIFY THE MALFUNCTIONING PARTS WITH “COMPONENT DIAGNOSIS”
Perform the diagnosis with “Component diagnosis” of the applicable system.
>> GO TO 5.
5.REPAIR OR REPLACE THE MALFUNCTIONING PARTS
Repair or replace the specified malfunctioning parts.
>> GO TO 6.
6.FINAL CHECK
Check that malfunctions are not reproduced when obtaining the malfunction information from the customer,
referring to the symptom inspection result in step 2.
Are the malfunctions corrected?
YES >> INSPECTION END
NO >> GO TO 3.

VENTILATION SEAT CONTROL UNIT
SE-59
< ECU DIAGNOSIS >[WITH VENTILATION SEAT]
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FRONT SEAT : Fail-safeINFOID:0000000003900687
 The ventilation seat control unit is equipped with the fail-safe function.
 When a malfunction occurs in the system as per the following, the ventilation seat control unit stops all out-
puts. The system enters in the system turns OFF position.
JCJWM0293GB

VENTILATION SEAT CONTROL UNITSE-67
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REAR SEAT : Fail-safeINFOID:0000000003940345
 The ventilation seat control unit is equipped with the fail-safe function.
 When a malfunction occurs in the system as per the follo wing, the ventilation seat control unit stops all out-
puts. The system enters in the system turns OFF position.
JCJWA0647GB

HI MODE AND LO MODE OF HEATED SEAT DO NOT OPERATE
SE-71
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HI MODE AND LO MODE OF HEATED SEAT DO NOT OPERATE
FRONT SEAT
FRONT SEAT : DescriptionINFOID:0000000003900696
NOTE:
 When short or open circuit occurs in heater unit circuit, the system enters fail-safe mode. Refer to SE-59,
"FRONT SEAT : Fail-safe".
FRONT SEAT : Diagnosis ProcedureINFOID:0000000003850497
1.CHECK FRONT HEATED SEAT SWITCH
Check front heated seat switch.
Refer to SE-13, "
FRONT SEAT : ComponentFunctionCheck".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace the malfunctioning parts.
2.CHECK FRONT SEATBACK HEATER
Check front seatback heater.
Refer to SE-33, "
FRONT SEAT : ComponentFunctionCheck".
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair or replace the malfunctioning parts.
3.CHECK FRONT SEAT CUSHION HEATER
Check front seat cushion heater.
Refer to SE-31, "
FRONT SEAT : ComponentFunctionCheck".
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair or replace the malfunctioning parts.
4.CONFIRM THE OPERATION
Confirm the operation again.
Is the inspection result normal?
YES >> Check intermittent incident. Refer to GI-35, "Intermittent Incident".
NO >> GO TO 1.
REAR SEAT
REAR SEAT : DescriptionINFOID:0000000003900697
NOTE:
 When short or open circuit occurs in heater unit circuit, the system enters fail-safe mode. Refer to SE-67,
"REAR SEAT : Fail-safe".
REAR SEAT : Diagnosis ProcedureINFOID:0000000003853477
1.CHECK REAR HEATED SEAT SWITCH
Check rear heated seat switch.
Refer to SE-15, "
REAR SEAT : ComponentFunctionCheck".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace the malfunctioning parts.
2.CHECK REAR SEATBACK HEATER
Check rear seatback heater.
Refer to SE-34, "
REAR SEAT : ComponentFunctionCheck".

SE-74
< SYMPTOM DIAGNOSIS >[WITH VENTILATION SEAT]
LO MODE OF HEATED SEAT DOES NOT OPERATE
LO MODE OF HEATED SEAT DOES NOT OPERATE
FRONT SEAT
FRONT SEAT : DescriptionINFOID:0000000003901738
NOTE:
 When short or open circuit occurs in heater unit circuit, the system enters fail-safe mode. Refer to SE-59,
"FRONT SEAT : Fail-safe".
FRONT SEAT : Diagnosis ProcedureINFOID:0000000003850499
1.CHECK FRONT HEATED SEAT SWITCH
Check front heated seat switch.
Refer to SE-13, "
FRONT SEAT : ComponentFunctionCheck".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace the malfunctioning parts.
2.CHECK FRONT SEATBACK HEATER
Check front seatback heater.
Refer to SE-33, "
FRONT SEAT : ComponentFunctionCheck".
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair or replace the malfunctioning parts.
3.CHECK FRONT SEAT CUSHION HEATER
Check front seat cushion heater.
Refer to SE-31, "
FRONT SEAT : ComponentFunctionCheck".
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair or replace the malfunctioning parts.
4.CONFIRM THE OPERATION
Confirm the operation again.
Is the inspection result normal?
YES >> Check intermittent incident. Refer to GI-35, "Intermittent Incident".
NO >> GO TO 1.
REAR SEAT
REAR SEAT : DescriptionINFOID:0000000003901739
NOTE:
 When short or open circuit occurs in heater unit circuit, the system enters fail-safe mode. Refer to SE-67,
"REAR SEAT : Fail-safe".
REAR SEAT : Diagnosis ProcedureINFOID:0000000003853479
1.CHECK REAR HEATED SEAT SWITCH
Check rear heated seat switch.
Refer to SE-15, "
REAR SEAT : ComponentFunctionCheck".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace the malfunctioning parts.
2.CHECK REAR SEATBACK HEATER
Check rear seatback heater.
Refer to SE-34, "
REAR SEAT : ComponentFunctionCheck".

SE-76
< SYMPTOM DIAGNOSIS >[WITH VENTILATION SEAT]
ONLY SEATBACK HEATER IS OPERATED IN HI MODE OF HEATED SEAT
ONLY SEATBACK HEATER IS OPERATED IN HI MODE OF HEATED SEAT
FRONT SEAT
FRONT SEAT : DescriptionINFOID:0000000003900698
NOTE:
 The phenomenon appears when a malfunction occurs while HI mode is being activated.
 When mode changes to LO mode, the system enters fail-safe mode. Refer to SE-59, "
FRONT SEAT : Fail-
safe".
FRONT SEAT : Diagnosis ProcedureINFOID:0000000003850488
1.CHECK FRONT SEAT CUSHION HEATER
Check front seat cushion heater.
Refer to SE-31, "
FRONT SEAT : ComponentFunctionCheck".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace the malfunctioning parts.
2.CONFIRM THE OPERATION
Confirm the operation again.
Is the inspection result normal?
YES >> Check intermittent incident. Refer to GI-35, "Intermittent Incident".
NO >> GO TO 1.
REAR SEAT
REAR SEAT : DescriptionINFOID:0000000003900699
NOTE:
 The phenomenon appears when a malfunction occurs while HI mode is being activated.
 When mode changes to LO mode, the system enters fail-safe mode. Refer to SE-67, "
REAR SEAT : Fail-
safe".
REAR SEAT : Diagnosis ProcedureINFOID:0000000003853480
1.CHECK REAR SEAT CUSHION HEATER
Check rear seat cushion heater.
Refer to SE-32, "
REAR SEAT : ComponentFunctionCheck".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace the malfunctioning parts.
2.CONFIRM THE OPERATION
Confirm the operation again.
Is the inspection result normal?
YES >> Check intermittent incident. Refer to GI-35, "Intermittent Incident".
NO >> GO TO 1.

ONLY SEAT CUSHION HEATER IS OPERATED IN HI MODE OF HEATED SEAT
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ONLY SEAT CUSHION HEATER IS OPERATED IN HI MODE OF HEATED
SEAT
FRONT SEAT
FRONT SEAT : DescriptionINFOID:0000000003900700
NOTE:
 The phenomenon appears when a malfunction occurs while HI mode is being activated.
 When mode changes to LO mode, the system enters fail-safe mode. Refer to SE-59, "
FRONT SEAT : Fail-
safe".
FRONT SEAT : Diagnosis ProcedureINFOID:0000000003850770
1.CHECK FRONT SEATBACK HEATER
Check front seatback heater.
Refer to SE-33, "
FRONT SEAT : ComponentFunctionCheck".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace the malfunctioning parts.
2.CONFIRM THE OPERATION
Confirm the operation again.
Is the inspection result normal?
YES >> Check intermittent incident. Refer to GI-35, "Intermittent Incident".
NO >> GO TO 1.
REAR SEAT
REAR SEAT : DescriptionINFOID:0000000003900701
NOTE:
 The phenomenon appears when a malfunction occurs while HI mode is being activated.
 When mode changes to LO mode, the system enters fail-safe mode. Refer to SE-67, "
REAR SEAT : Fail-
safe".
REAR SEAT : Diagnosis ProcedureINFOID:0000000003853481
1.CHECK REAR SEATBACK HEATER
Check rear seatback heater.
Refer to SE-34, "
REAR SEAT : ComponentFunctionCheck".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace the malfunctioning parts.
2.CONFIRM THE OPERATION
Confirm the operation again.
Is the inspection result normal?
YES >> Check intermittent incident. Refer to GI-35, "Intermittent Incident".
NO >> GO TO 1.

SE-80
< SYMPTOM DIAGNOSIS >[WITH VENTILATION SEAT]
SQUEAK AND RATTLE TROUBLE DIAGNOSES
SQUEAK AND RATTLE TROUBLE DIAGNOSES
Work FlowINFOID:0000000003940143
CUSTOMER INTERVIEW
Interview the customer if possible, to determine the conditions that exist when the noise occurs. Use the Diag-
nostic Worksheet during the interview to document the facts and conditions when the noise occurs and any of
the customer's comments; refer to SE-84, "
Diagnostic Worksheet". This information is necessary to duplicate
the conditions that exist when the noise occurs.
 The customer may not be able to provide a detailed description or the location of the noise. Attempt to obtain
all the facts and conditions that exist when the noise occurs (or does not occur).
 If there is more than one noise in the vehicle, be sure to diagnose and repair the noise that the customer is
concerned about. This can be accomplished by a test drive with the customer.
 After identifying the type of noise, isolate the noise in terms of its characteristics. The noise characteristics
are provided so the customer, service adviser and technician are all speaking the same language when
defining the noise.
 Squeak – (Like tennis shoes on a clean floor)
Squeak characteristics include the light contact/fast movement/brought on by road conditions/hard surfaces
= higher pitch noise/softer surfaces = lower pitch noises/edge to surface = chirping
 Creak – (Like walking on an old wooden floor)
Creak characteristics include firm contact/slow movement/twisting with a rotational movement/pitch depen-
dent on materials/often brought on by activity.
 Rattle – (Like shaking a baby rattle)
Rattle characteristics include the fast repeated contact/vibration or similar movement/loose parts/missing
clip or fastener/incorrect clearance.
 Knock – (Like a knock on a door)
Knock characteristics include hollow sounding/sometimes repeating/often brought on by driver action.
 Tick – (Like a clock second hand)
Tick characteristics include gentle contacting of light materials/loose components/can be caused by driver
action or road conditions.
 Thump – (Heavy, muffled knock noise)
Thump characteristics include softer knock/dead sound often brought on by activity.
 Buzz – (Like a bumble bee)
Buzz characteristics include high frequency rattle/firm contact.
 Often the degree of acceptable noise level will vary depending upon the person. A noise that a technician
may judge as acceptable may be very irritating to the customer.
 Weather conditions, especially humidity and temperature, may have a great effect on noise level.
DUPLICATE THE NOISE AND TEST DRIVE
If possible, drive the vehicle with the customer until the noise is duplicated. Note any additional information on
the Diagnostic Worksheet regarding the conditions or location of the noise. This information can be used to
duplicate the same conditions when the repair is reconfirmed.
SBT842

SQUEAK AND RATTLE TROUBLE DIAGNOSES
SE-81
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If the noise can be duplicated easily during the test drive, to help identify the source of the noise, try to dupli-
cate the noise with the vehicle stopped by doing one or all of the following:
1) Close a door.
2) Tap or push/pull around the area where the noise appears to be coming from.
3) Rev the engine.
4) Use a floor jack to recreate vehicle “twist”.
5) At idle, apply engine load (electrical load, half-clutch on M/T model, drive position on A/T model).
6) Raise the vehicle on a hoist and hit a tire with a rubber hammer.
 Drive the vehicle and attempt to duplicate the conditions the customer states exist when the noise occurs.
 If it is difficult to duplicate the noise, drive the vehicle slowly on an undulating or rough road to stress the
vehicle body.
LOCATE THE NOISE AND IDENTIFY THE ROOT CAUSE
1. Narrow down the noise to a general area. To help pinpoint the source of the noise, use a listening tool
(Engine Ear or mechanics stethoscope).
2. Narrow down the noise to a more specific area and identify the cause of the noise by:
 Removing the components in the area that is are suspected to be the cause of the noise.
Do not use too much force when removing clips and fasteners, otherwise clips and fastener can be broken
or lost during the repair, resulting in the creation of new noise.
 Tapping or pushing/pulling the component that is are suspected to be the cause of the noise.
Do not tap or push/pull the component with excessive force, otherwise the noise will be eliminated only tem-
porarily.
 Feeling for a vibration by hand by touching the component(s) that is are suspected to be the cause of the
noise.
 Placing a piece of paper between components that is are suspected to be the cause of the noise.
 Looking for loose components and contact marks.
Refer to SE-82, "
Inspection Procedure".
REPAIR THE CAUSE
 If the cause is a loose component, tighten the component securely.
 If the cause is insufficient clearance between components:
- Separate components by repositioning or loosening and retightening the component, if possible.
- Insulate components with a suitable insulator such as urethane pads, foam blocks, felt cloth tape or ure-
thane tape. These insulators are available through the authorized Nissan Parts Department.
CAUTION:
Never use excessive force as many components are constructed of plastic and may be damaged.
NOTE:
 URETHANE PADS
Insulates connectors, harness, etc.
 INSULATOR (Foam blocks)
Insulates components from contact. Can be used to fill space behind a panel.
 INSULATOR (Light foam block)
 FELT CLOTHTAPE
Used to insulate where movement does not occur. Ideal for instrument panel applications.
The following materials, not available through NISSAN Parts Department, can also be used to repair
squeaks and rattles.
 UHMW(TEFLON) TAPE
Insulates where slight movement is present. Ideal for instrument panel applications.
 SILICONE GREASE
Used in place of UHMW tape that is be visible or does not fit.
Note: Will only last a few months.
 SILICONE SPRAY
Used when grease cannot be applied.
 DUCT TAPE
Used to eliminate movement.
CONFIRM THE REPAIR
Confirm that the cause of a noise is repaired by test driving the vehicle. Operate the vehicle under the same
conditions as when the noise originally occurred. Refer to the notes on the Diagnostic Worksheet.

SQUEAK AND RATTLE TROUBLE DIAGNOSES
SE-83
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SEATS
When isolating seat noise it is important to note the position the seat is in and the load placed on the seat
when the noise occurs. These conditions should be duplicated when verifying and isolating the cause of the
noise.
Cause of seat noise include:
1. Headrest rods and holder
2. A squeak between the seat pad cushion and frame
3. Rear seatback lock and bracket
These noises can be isolated by moving or pressing on the suspected components while duplicating the con-
ditions under which the noise occurs. Most of these incidents can be repaired by repositioning the component
or applying urethane tape to the contact area.
UNDERHOOD
Some interior noise may be caused by components under the hood or on the engine wall. The noise is then
transmitted into the passenger compartment.
Causes of transmitted underhood noise include:
1. Any component mounted to the engine wall
2. Components that pass through the engine wall
3. Engine wall mounts and connectors
4. Loose radiator mounting pins
5. Hood bumpers out of adjustment
6. Hood striker out of adjustment
These noises can be difficult to isolate since they cannot be reached from the interior of the vehicle. The best
method is to secure, move or insulate one component at a time and test drive the vehicle. Also, engine RPM
or load can be changed to isolate the noise. Repairs can usually be made by moving, adjusting, securing, or
insulating the component causing the noise.