NISSAN ALMERA 2001 Service Manual

3 CHECK REAR WINDOW DEFOGGER SWITCH INPUT SIGNAL
Check continuity between time control unit terminal 3 and ground.
SEL457X
OK or NG
OK©GO TO 4.
NG©Check the following.
+Rear window defogger switch
(Refer to EL-255.)
+Harness for open or short between time control unit and rear window defogger switch
+Rear window defogger switch ground circuit
4 CHECK POWER SUPPLY AND IGNITION INPUT SIGNAL
Check voltage between time control unit terminals 1 or 9 and ground.
SEL447X
OK or NG
OK©GO TO 5.
NG©Check the following.
+10A fuse or 15A fuse [No. 10 or No. 5, located in the fuse block (J/B)]
+Harness for open or short between time control unit and fuse
REAR WINDOW DEFOGGER
Trouble Diagnoses/Hatchback (Cont'd)
EL-253

5 CHECK CONTROL UNIT GROUND CIRCUIT
Check continuity between time control unit terminal 16 and ground.
SEL448X
Ye s©Replace time control unit.
No©Repair harness or connectors.
REAR WINDOW DEFOGGER
Trouble Diagnoses/Hatchback (Cont'd)
EL-254

SEL970W
Electrical Components Inspection=NJEL0076REAR WINDOW DEFOGGER RELAYNJEL0076S01Check continuity between terminals 3 and 5, 6 and 7.
Condition Continuity
12V direct current supply between ter-
minals 1 and 2Ye s
No current supply No
SEL969WA
REAR WINDOW DEFOGGER SWITCHNJEL0076S02Check continuity between terminals when rear window defogger
switch is pushed and released.
NEL797
Terminals Condition Continuity
3-5Rear window defogger
switch is pushed.Ye s
Rear window defogger
switch is released.No
REAR WINDOW DEFOGGER
Electrical Components Inspection
EL-255

SEL263
Filament Check=NJEL00771. Attach probe circuit tester (in volt range) to middle portion of
each filament.
SEL122R
+When measuring voltage, wrap tin foil around the top of
the negative probe. Then press the foil against the wire
with your finger.
SEL265
2. If a filament is burned out, circuit tester registers 0 or 12 volts.
SEL266
3. To locate burned out point, move probe to left and right along
filament. Test needle will swing abruptly when probe passes
the point.
REAR WINDOW DEFOGGER
Filament Check
EL-256

Filament RepairNJEL0078REPAIR EQUIPMENTNJEL0078S011) Conductive silver composition (Dupont No. 4817 or equivalent)
2) Ruler 30 cm (11.8 in) long
3) Drawing pen
4) Heat gun
5) Alcohol
6) Cloth
BE540
REPAIRING PROCEDURENJEL0078S021. Wipe broken heat wire and its surrounding area clean with a
cloth dampened in alcohol.
2. Apply a small amount of conductive silver composition to tip of
drawing pen.
Shake silver composition container before use.
3. Place ruler on glass along broken line. Deposit conductive sil-
ver composition on break with drawing pen. Slightly overlap
existing heat wire on both sides [preferably 5 mm (0.20 in)] of
the break.
SEL012D
4. After repair has been completed, check repaired wire for con-
tinuity. This check should be conducted 10 minutes after silver
composition is deposited.
Do not touch repaired area while test is being conducted.
SEL013D
5. Apply a constant stream of hot air directly to the repaired area
for approximately 20 minutes with a heat gun. A minimum dis-
tance of 3 cm (1.2 in) should be kept between repaired area
and hot air outlet. If a heat gun is not available, let the repaired
area dry for 24 hours.
REAR WINDOW DEFOGGER
Filament Repair
EL-257

System Description/Sedan=NJEL0381Refer to Owner's Manual for audio system operating instructions.
Power is supplied at all times
+through 15A fuse (No. 32, located in the fusible link and fuse block)
+to audio unit terminal 9
+to CD auto changer terminal 32.
With the ignition switch in the ACC or ON position, power is supplied
+through 10A fuse [No. 1, located in the fuse block (J/B)]
+to audio unit terminal 3,
+to CD auto changer terminal 36
Ground is supplied through the case of the audio unit.
Audio signals are supplied
+through audio unit terminals 7, 10, 11, 12, 13, 14, 15, 16
+to terminals 1 and 2 of front door speaker LH and RH,
+to terminals 1 and 2 of rear door speaker LH and RH and
+to terminals 1 and 2 of pillar tweeter LH and RH (with 6 speakers)
When the navigation system is triggered,
power is supplied
+through navi control unit terminal 46
+to speaker relay terminal 2
Ground is supplied
+through navi control unit terminal 44
+to speaker relay terminal 1
With power and ground supplied, the relay is energized, and then audio signal is interrupted to front door
speaker RH (LHD models) or LH (RHD models), and pillar tweeter RH (LHD models) or LH (RHD models)
For detailed, refer to ªNAVIGATION SYSTEMº.
NATS AUDIO LINKNJEL0381S04DescriptionNJEL0381S0401The link with the NATS IMMU implies that the audio unit can basically only be operated if connected to the
matching NATS IMMU to which the audio unit was initially fitted on the production line.
Since radio operation is impossible after the link with the NATS is disrupted theft of the audio unit is basically
useless since special equipment is required to reset the audio unit.
Initialization process for audio units that are linked to the NATS IMMU
New audio units will be delivered to the factories in the ªNEWº state, i.e. ready to be linked with the vehicle's
NATS. When the audio unit in ªNEWº state is first switched on at the factory, it will start up communication
with the vehicle's immobiliser control unit (IMMU) and send a code (the ªaudio unit Codeº) to the IMMU. The
IMMU will then store this code, which is unique to each audio unit, in its (permanent) memory.
Upon receipt of the code by the IMMU, the NATS will confirm correct receipt of the audio unit code to the audio
unit. Hereafter, the audio unit will operate as normal.
During the initialisation process, ªNEWº is displayed on the audio unit display. Normally though, communica-
tion between audio unit and IMMU takes such a short time (300 ms) that the audio unit seems to switch on
directly without showing ªNEWº on its display.
Normal operation
Each time the audio unit is switched on afterwards, the audio unit code will be verified between the audio unit
and the NATS before the audio unit becomes operational. During the code verification process, ªWAITº is
shown on the audio unit display. Again, the communication takes such a short time (300 ms) that the audio
unit seems to switch on directly without showing ªWAITº on its display.
When the radio is locked
In case of a audio unit being linked with the vehicle's NATS (immobilizer system), disconnection of the link
between the audio unit and the IMMU will cause the audio unit to switch into the lock (ªSECUREº) mode in
which the audio unit is fully inoperative. Hence, repair of the audio unit is basically impossible, unless the audio
unit is reset to the ªNEWº state for which special decoding equipment is required.
Clarion has provided their authorized service representatives with so called ªdecoder boxesº which can bring
the audio unit back to the ªNEWº state, enabling the audio unit to be switched on after which repair can be
AUDIO
System Description/Sedan
EL-258

carried out. Subsequently, when the repaired audio unit is delivered to the final user again, it will be in the
ªNEWº state as to enable re-linking the audio unit to the vehicle's immobiliser system. As a result of the above,
repair of the audio unit can only be done by an authorized Clarion representative.
SPEED DEPENDENT VOLUME CONTROLNJEL0381S06DescriptionNJEL0381S0601If activated, the radio output volume will be automatically adjusted to compensate for increasing driving noises
at higher driving speeds.
The radio receives a speed signal from the vehicle speed sensor (VSS) and selects the output volume.
PERSONAL AUDIO SETTINGSNJEL0381S07DescriptionNJEL0381S0701The radio is designed to store several settings (volume, bass, treble, preset stations and level of speed
dependent volume control) with every NATS ignition key used. Up to a maximum of 4 NATS keys can be reg-
istered. During the communication as mentioned under ªAnti-Theft Systemº, the radio will recognize the used
ignition key and select the accompanying settings.
AUDIO
System Description/Sedan (Cont'd)
EL-259

Schematic/SedanNJEL0382
HEL397B
AUDIO
Schematic/Sedan
EL-260

Wiring Diagram Ð AUDIO Ð/SedanNJEL0383LHD MODELSNJEL0383S01
HEL398B
AUDIO
Wiring Diagram Ð AUDIO Ð/Sedan
EL-261

HEL399B
AUDIO
Wiring Diagram Ð AUDIO Ð/Sedan (Cont'd)
EL-262