2003 NISSAN TEANA Power

HEATED SEAT
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through heated seat control unit terminal 23 and 42

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

to heated seat control unit terminal 19

through rear heated seat switch LH terminals 19 and 21

through grounds B16 and B17.
And, power is supplied

through heated seat control unit terminal 35

to seat heater LH terminal 35
ground is supplied

to seat heater LH terminal 39 and 36

through heated seat control unit terminal 36 and 42

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

to rear heated seat switch LH terminal 24

through heated seat control unit terminal 24 and 42

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

to heated seat control unit terminal 28

through rear heated seat switch RH terminals 28 and 29

through grounds B16 and B17.
And, power is supplied

through heated seat control unit terminal 38

to seat heater RH terminal 38
ground is supplied

to seat heater RH terminal 40

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

to rear heated seat switch RH terminal 31

through heated seat control unit terminal 31 and 42

through grounds B16 and B17.
Then LOW indicator illuminates in rear heated seat switch RH.
HIGH FUNCTION
When rear heated seat switch RH is in HIGH position, ground is supplied

to heated seat control unit terminal 27

through rear heated seat switch RH terminals 27 and 29

through grounds B16 and B17.
And, power is supplied

through heated seat control unit terminal 37

to seat heater RH terminal 37
ground is supplied

to seat heater RH terminal 40 and 38

through heated seat control unit terminal 38 and 42

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

SE-76
HEATED SEAT

Trouble Diagnoses Symptom Chart For Rear Heated SeatBIS0013J
Symptom Diagnosis procedureReference
page
All functions of seat heater do not activate.1. Check heated seat control unit power supply and ground circuit SE-77
2. Replace heated seat control unit –
Seat heater LH does not activate.1. Check heated seat switch LH circuit SE-79
2. Check seat heater LH circuit SE-83
3. Replace heated seat control unit –
Seat heater RH does not activate.1. Check heated seat switch RH circuitSE-81
2. Check seat heater RH circuit SE-84
3. Replace heated seat control unit –
Heated seat switch indicator LH does not illuminate.1. Check heated seat switch indicator LH circuit SE-85
2. Replace heated seat control unit –
Heated seat switch indicator RH does not illuminate.1. Check heated seat switch indicator RH circuit SE-87
2. Replace heated seat control unit –

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
SE-79
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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

HEATED SEAT
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2. CHECK SEAT HEATER RH GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between seat heater RH harness connector
B174 terminal 40 and ground.
OK or NG
OK >> Check harness connection.

If it is OK, replace seat heater RH.

If it is NG, repair or replace malfunction part.
NG >> Repair or replace harness.
3. CHECK SEAT HEATER RH CIRCUIT (CONTINUITY)
1. Turn ignition switch OFF.
2. Disconnect heated seat control unit connector.
3. Check continuity between seat heater RH harness connector
B174 terminal 37, 38 and heated seat control unit harness con-
nector B182 terminal 37, 38.
4. Check continuity between seat heater RH harness connector
B174 terminal 37, 38 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 Indicator LH Circuit BIS0013P
1. CHECK HEATED SEAT SWITCH INDICATOR LH POWER SUPPLY
1. Turn ignition switch ON.
2. Check voltage between heated seat switch LH harness connec-
tor B176 terminal 22 and ground.
OK or NG
OK >> GO TO 2.
NG >> GO TO 3.40 (B) – Ground : Continuity should exist.
PIIB2161E
LOW
38 (P) – 38 (P) : Continuity should exist
HIGH
37 (O) – 37 (O) : Continuity should exist
LOW
38 (P) – Ground : Continuity should not exist
HIGH
37 (O) – Ground : Continuity should not exist
PIIB8703E
22 (Y/R) - Ground : Battery voltage
PIIB2163E

SE-86
HEATED SEAT

2. CHECK HEATED SEAT SWITCH INDICATOR LH CIRCUIT
Check voltage between heated seat switch LH harness connector
and ground.
OK or NG
OK >> GO TO 4.
NG >> Check harness connection.

If it is OK, replace heated seat switch LH.

If it is NG, repair or replace malfunction part.
3. CHECK HEATED SEAT SWITCH INDICATOR LH POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect heated seat relay connector and heated seat switch LH connector.
3. Check continuity between heated seat relay harness connector
M79 terminal 6 and heated seat switch LH harness connector
B176 terminal 22.
OK or NG
OK >> Check harness connection.
NG >> Repair or replace harness.
4. CHECK HEATED SEAT SWITCH LH GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect heated seat switch LH connector and heated seat control unit connector.
3. Check continuity between heated seat switch LH harness con-
nector B176 terminal 23, 24 and heated seat control unit har-
ness connector B182 terminal 23, 24.
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.
ConnectorTerminal
(Wire color)
ConditionVoltage [V]
(Approx.)
(+) (-)
B17623 (R/W)
GroundHeated seat switch LH is in
LOW position.Battery voltage
Except above. 0
24 (R/Y)Heated seat switch LH is in
HIGH position.Battery voltage.
Except above. 0
PIIB2164E
6 (GR) – 22 (Y/R) : Continuity should exist.
PIIB2165E
LOW
23 (R/W) – 23 (R/W) : Continuity should exist.
HIGH
24 (R/Y) – 24 (R/Y) : Continuity should exist.
PIIB8704E