ignition NISSAN TEANA 2003 Service Manual

SE-62
HEATED SEAT

Passenger Side
LOW FUNCTION
When front heated seat switch (passenger side) is in LOW position, power is supplied

through front heated seat switch (passenger side) terminal 2

to seat heater (passenger side) terminals 21.
And, ground is supplied

to seat heater terminal 20

through grounds B214 and B217.
Then seat heater (passenger side) LOW function is activated.
At this time ground is supplied

to front heated seat switch (passenger side) terminal 4

through grounds M71 and M72.
Then indicator illuminates in front heated seat switch (passenger side).
HIGH FUNCTIN
When front heated seat switch (passenger side) is in HIGH position, power is supplied

through front heated seat switch (passenger side) terminal 3

to seat heater (passenger side) terminals 22.
And, ground is supplied

to seat heater terminal 20

through grounds B214 and B217.
Then seat heater (passenger side) HIGH function is activated.
At this time ground is supplied

to front heated seat switch (passenger side) terminal 4

through grounds M71 and M72.
Then indicator illuminates in front heated seat switch (passenger side).
REAR HEATED SEAT
When ignition switch is ON, heated seat relay activates.
Then power is supplied

through 10A fuse [No. 3, located in fuse block (J/B)]

through heated seat relay terminals 6 and 7

to heated seat control unit terminal 41 and

to rear heated seat switch LH terminal 22 and RH terminal 30.
Ground is supplied at all times

to heated seat control unit terminal 42

through grounds B16 and B17.
LH Side
LOW FUNCTION
When rear heated seat switch LH is in LOW position, ground is supplied

to heated seat control unit terminal 20

through rear heated seat switch LH terminals 20 and 21

through grounds B16 and B17.
And, power is supplied

through heated seat control unit terminal 36

to seat heater LH terminal 36
ground is supplied

to seat heater LH terminal 39

through grounds B16 and B17.
Then seat heater LH LOW function is activated.
At this time ground is supplied

to rear heated seat switch LH terminal 23

HEATED SEAT
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Terminals and Reference Values for Heated Seat Control UnitBIS0013H
Work FlowBIS0013I
1. Check the symptom and customer's requests.
2. Understand the outline of system. Refer to SE-61, "
System Description" .
3. According to the trouble diagnosis chart, repair or replace the cause of the malfunction. Refer to SE-76,
"Trouble Diagnoses Symptom Chart For Rear Heated Seat" .
4. Does heated seat operate normally?
YES: GO TO 5.
NO: GO TO 3.
5. INSPECTION END.
Te r -
minalWire
colorItemSignal
Input/OutputIgnition
switchConditionVoltage [V]
(Approx.)
19 GR/R LH High switch signal Input
ONHeated seat switch LH is in High position 0
Except above 5
20 GR LH Low switch signal InputHeated seat switch LH is in Low position 0
Except above 5
23 R/W LH Low indicator signal OutputHeated seat switch LH is in Low position 0
Except above Battery voltage
24 R/Y LH High indicator signal OutputHeated seat switch LH is in High position 0
Except above Battery voltage
27 GR/B RH High switch signal InputHeated seat switch RH is in HIgh position 0
Except above 5
28 GR/L RH Low switch signal InputHeated seat switch RH is in Low position 0
Except above 5
31 R/G RH Low indicator signal OutputHeated seat switch RH is in Low position 0
Except above Battery voltage
32 R/B RH High indicator signal OutputHeated seat switch RH is in High position 0
Except above Battery voltage
35 G LH High signal Output Seat heater LH High operation Battery voltage
36 L LH Low signal Output Seat heater LH Low operation Battery voltage
37 O RH High signal Output Seat heater RH High operation Battery voltage
38 P RH Low signal Output Seat heater RH Low operation Battery voltage
41 Y/R Power source Input — Battery voltage
42 B Ground — — 0

HEATED SEAT
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Check Heated Seat Control Unit Power Supply and Ground Circuit BIS0013K
1. CHECK FUSE
Check the following fuses.
OK or NG
OK >> GO TO 2.
NG >> If fuse is blown, be sure to eliminate cause of malfunction before installing new fuse, refer to PG-
3, "POWER SUPPLY ROUTING CIRCUIT" .
2. CHECK HEATED SEAT RELAY
Check voltage between heated seat relay harness connector and ground.
OK or NG
OK >> GO TO 3.
NG >> Repair or replace harness between fuse and heated
seat relay.
3. CHECK HEATED SEAT RELAY
1. Turn ignition switch OFF.
2. Disconnect heated seat relay connector.
3. Check continuity between terminals.
OK or NG
OK >> GO TO 4.
NG >> Replace heated seat relay.
Component parts Fuse No. Ampere
Fuse block (J/B)3
10A 8
12
ConnectorTerminal
(Wire color)
ConditionVoltage [V]
(Approx.)
(+) (–)
M792 (G)
Ground IGN ON Battery voltage 5 (L)
7 (L)
PIIB2144E
Terminal
Condition Continuity
(+) (–)
3512V direct current supply between terminals
1 and 2.Ye s
No current supply No
6712V direct current supply between terminals
1 and 2.Ye s
No current supply No
SEC202B

SE-78
HEATED SEAT

4. CHECK HEATED SEAT RELAY GROUND CIRCUIT
Check continuity between heated seat relay harness connector M79
terminal 1 and ground.
OK or NG
OK >> GO TO 5.
NG >> Repair or replace harness.
5. CHECK HEATED SEAT CONTROL UNIT POWER SUPPLY
1. Connect heated seat relay connector.
2. Turn ignition switch ON.
3. Check voltage between heated seat control unit harness con-
nector B182 terminal 41 and ground.
OK or NG
OK >> GO TO 6.
NG >> GO TO 7.
6. CHECK HEATED SEAT CONTROL UNIT GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect heated seat control unit connector.
3. Check continuity between heated seat control unit harness con-
nector B182 terminal 42 and ground.
OK or NG
OK >> Heated seat control unit power supply and ground circuit
are OK.
NG >> Repair or replace harness.1 (B) – Ground : Continuity should exist.
PIIB2145E
41 (Y/R) – Ground : Battery voltage
PIIB8697E
42 (B) – Ground : Continuity should exist.
PIIB8698E

HEATED SEAT
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7. CHECK HEATED SEAT CONTROL UNIT POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect heated seat control unit connector.
3. Check continuity between heated seat relay harness connector
M79 terminal 6 and heated seat control unit harness connector
M182 terminal 41.
4. Check continuity between heated seat relay harness connector
M79 terminal 6 and ground.
OK or NG
OK >> Check harness connection.

If it is OK, replace heated seat control unit.

If it is NG, repair or replace malfunction part.
NG >> Repair or replace harness.
Check Heated Seat Switch LH Circuit BIS0013L
1. CHECK HEATED SEAT SWITCH LH CIRCUIT (VOLTAGE)
1. Turn ignition switch OFF.
2. Disconnect heated seat switch LH connector.
3. Turn ignition switch ON.
4. Check voltage between heated seat switch LH harness connec-
tor and ground.
OK or NG
OK >> GO TO 2.
NG >> GO TO 3.
2. CHECK HEATED SEAT SWITCH LH
1. Turn ignition switch OFF.
2. Check continuity between heated seat switch LH terminals.
OK or NG
OK >> GO TO 4.
NG >> Replace heated seat switch LH.6 (G/R) – 41(Y/R) : Continuity should exist.
6 (G/R) – Ground : Continuity should not exist.
PIIB8699E
ConnectorTerminal
(Wire color)
ConditionVoltage [V]
(Approx.)
(+) (-)
B17620 (GR)
GroundHeated seat switch LH is in
LOW position.5
Except above. 0
19 (GR/R)Heated seat switch LH is in
HIGH position.5
Except above. 0
PIIB2149E
Terminal Condition Continuity
20 - 21Heated seat switch is in LOW position. Yes
Except above. No
19 - 21Heated seat switch is in HIGH position. Yes
Except above. No
PIIB2150E

SE-80
HEATED SEAT

3. CHECK HEATED SEAT SWITCH LH CIRCUIT (CONTINUITY)
1. Turn ignition switch OFF.
2. Disconnect heated seat control unit connector.
3. Check continuity between heated seat switch LH harness con-
nector B176 terminal 19, 20 and heated seat control unit har-
ness connector B182 terminal 19, 20.
4. Check continuity between heated switch LH harness connector
B176 terminal 19, 20 and ground.
OK or NG
OK >> Check harness connection.

If it is OK, replace heated seat control unit.

If it is NG, repair or replace malfunction part.
NG >> Repair or replace harness.
4. CHECK HEATED SEAT SWITCH LH GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between heated seat switch LH harness con-
nector B176 terminal 21 and ground.
OK or NG
OK >> Check harness connection.

If it is OK, replace heated seat switch LH.

If it is NG, repair or replace malfunction part.
NG >> Repair or replace harness.LOW
20 (GR) – 20 (GR) : Continuity should exist.
HIGH
19 (GR/R) – 19 (GR/R) : Continuity should exist.
LOW
20 (GR) – Ground : Continuity should not exist.
HIGH
19 (GR/R) – Ground : Continuity should not exist.
PIIB8700E
21 (B) – Ground : Continuity should exist.
PIIB2152E

HEATED SEAT
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Check Heated Seat Switch RH Circuit BIS0013M
1. CHECK HEATED SEAT SWITCH RH CIRCUIT (VOLTAGE)
1. Turn ignition switch OFF.
2. Disconnect heated seat switch RH connector.
3. Turn ignition switch ON.
4. Check voltage between heated seat switch RH harness connec-
tor and ground.
OK or NG
OK >> GO TO 2.
NG >> GO TO 3.
2. CHECK HEATED SEAT SWITCH RH
1. Turn ignition switch OFF.
2. Check continuity between heated seat switch RH terminals.
OK or NG
OK >> GO TO 4.
NG >> Replace heated seat switch RH.
ConnectorTe r m i n a l
(Wire color)
ConditionVoltage [V]
(Approx.)
(+) (-)
B17728 (GR/L)
GroundHeated seat switch RH is in
LOW position.5
Except above. 0
27 (GR/B)Heated seat switch RH is in
HIGH position.5
Except above. 0
PIIB2153E
Terminal Condition Continuity
28 - 29Heated seat switch is in LOW position. Yes
Except above. No
27 - 29Heated seat switch is in HIGH position. Yes
Except above. No
PIIB2154E

SE-82
HEATED SEAT

3. CHECK HEATED SEAT SWITCH RH CIRCUIT (CONTINUITY)
1. Turn ignition switch OFF.
2. Disconnect heated seat control unit connector.
3. Check continuity between heated seat switch RH harness con-
nector B177 terminal 27, 28 and heated seat control unit har-
ness connector B182 terminal 27, 28.
4. Check continuity between heated seat switch RH harness con-
nector B177 terminal 27, 28 and ground.
OK or NG
OK >> Check harness connection.

If it is OK, replace heated seat control unit.

If it is NG, repair or replace malfunction part.
NG >> Repair or replace harness.
4. CHECK HEATED SEAT SWITCH GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between heated seat switch RH harness con-
nector B177 terminal 29 and ground.
OK or NG
OK >> Check harness connection.

If it is OK, replace heated seat switch RH.

If it is NG, repair or replace malfunction part.
NG >> Repair or replace harness.LOW
28 (GR/L) – 28 (GR/L) : Continuity should exist.
HIGH
27 (GR/B) – 27 (GR/B) : Continuity should exist.
LOW
28 (GR/L) – Ground : Continuity should not exist.
HIGH
27 (GR/B) – Ground : Continuity should not exist.
PIIB8701E
29 (B) – Ground : Continuity should exist.
PIIB2156E

HEATED SEAT
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Check Seat Heater LH Circuit BIS0013N
1. CHECK SEAT HEATER LH CIRCUIT (VOLTAGE)
1. Turn ignition switch OFF.
2. Disconnect seat heater LH connector.
3. Turn ignition switch ON.
4. Check voltage between seat heater LH harness connector and
ground.
OK or NG
OK >> GO TO 2.
NG >> GO TO 3.
2. CHECK SEAT HEATER LH GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between seat heater LH harness connector
B173 terminal 39 and ground.
OK or NG
OK >> Check harness connection.

If it is OK, replace seat heater LH.

If it is NG, repair or replace malfunction part.
NG >> Repair or replace harness.
ConnectorTe r m i n a l
(Wire color)
ConditionVoltage [V]
(Approx.)
(+) (–)
B17336 (L)
GroundHeated seat switch LH is
in LOW position. Battery voltage
Except above. 0
35 (G)Heated seat switch LH is
in HIGH position. Battery voltage
Except above. 0
PIIB2157E
39 (B) – Ground : Continuity should exist.
PIIB2158E

SE-84
HEATED SEAT

3. CHECK SEAT HEATER LH CIRCUIT (CONTINUITY)
1. Turn ignition switch OFF.
2. Disconnect heated seat control unit connector.
3. Check continuity between seat heater LH harness connector
B173 terminal 35, 36 and heated seat control unit harness con-
nector B182 terminal 35, 36.
4. Check continuity between seat heater LH harness connector
B173 terminal 35, 36 and ground.
OK or NG
OK >> Check harness connection.

If it is OK, replace heated seat control unit.

If it is NG, repair or replace malfunction part.
NG >> Repair or replace harness.
Check Seat Heater RH Circuit BIS0013O
1. CHECK SEAT HEATER RH CIRCUIT (VOLTAGE)
1. Turn ignition switch OFF.
2. Disconnect seat heater RH connector.
3. Turn ignition switch ON.
4. Check voltage between seat heater RH harness connector and
ground.
OK or NG
OK >> GO TO 2.
NG >> GO TO 3.LOW
36 (L) – 36 (L) : Continuity should exist
HIGH
35 (G) – 35 (G) : Continuity should exist
LOW
36 (L) – Ground : Continuity should not exist
HIGH
35 (G) – Ground : Continuity should not exist
PIIB8702E
ConnectorTerminal
(Wire color)
ConditionVoltage [V]
(Approx.)
(+) (–)
B17438 (P)
GroundHeated seat switch RH is
in LOW position. Battery voltage
Except above. 0
37 (O)Heated seat switch RH is
in HIGH position. Battery voltage
Except above. 0
PIIB2160E