Page 3345 of 3502

AIR MASSAGE SEAT
SE-89
C
D
E
F
G
H
J
K
L
MA
B
SE
AIR MASSAGE SEATPFP:876B1
System Description BIS0013R
Air bladder is built in seatback.
There are four bladder in each seatback.
Upper air bladder and lower air bladder are inflated by turns.
Air bladder is inflated with air by air massage seat pump.
Air massage seat pump is controlled by air massage seat con-
trol unit.
Air massage seat pump has two operation pattern, LOW and
HIGH.
Air massage seat solenoid performs the change of LOW and
HIGH.
Air massage seat solenoid is built in air massage seat control
unit.
Front air massage seat switch is LOW and HIGH switch.
FRONT AIR MASSAGE SEAT OPERATION
With the ignition switch to ON or START position, power is supplied
through 15A fuse [No.15, located in the fuse block (J/B)]
to air massage seat control unit terminal 15, and
to front air massage seat switch terminal 1.
Ground is supplied
through air massage seat control unit terminal 18,
through body grounds B214 and B217.
When front air massage seat switch is LOW position, power is suppled
through front air massage seat switch terminal 2,
to air massage seat control unit terminal 16,
Then front air massage seat LOW function is activated.
When front air massage seat switch is HIGH position, power is suppled
through front air massage seat switch terminal 3,
to air massage seat control unit terminal 17,
Then front air massage seat HIGH function is activated.
PIIB8709E
Page 3346 of 3502
SE-90
AIR MASSAGE SEAT
Component Parts and Harness Connector LocationBIS0013S
PIIB8710E
1. Fuse block (J/B) 2.a: Air massage seat pump
b: Air massage seat control unit
(Air massage seat solenoid is unified)
B320
Page 3347 of 3502
AIR MASSAGE SEAT
SE-91
C
D
E
F
G
H
J
K
L
MA
B
SE
Wiring Diagram — M/SEAT —BIS0013U
TIWM1795E
Page 3348 of 3502
SE-92
AIR MASSAGE SEAT
TIWM1796E
Page 3349 of 3502

AIR MASSAGE SEAT
SE-93
C
D
E
F
G
H
J
K
L
MA
B
SE
Terminal and Reference Value For Air Massage Seat Control Unit BIS0013Y
Work FlowBIS00140
1. Check the symptom and customer's requests.
2. Understand the outline of system. Refer to SE-89, "
System Description" .
3. According to the trouble diagnosis chart, repair or replace the cause of the malfunction. Refer to SE-93,
"Trouble Diagnoses Symptom Chart" .
4. Does air massage seat operate normally? YES: GO TO 5, NO: GO TO 3.
5. INSPECTION END.
Trouble Diagnoses Symptom ChartBIS00141
Check that other systems using the signal of the following systems operate normally.
Te r m i -
nalWire
ColorItemSignal
Input/OutputConditionVoltage (V)
(Approx.)
15 L Ignition switch power supply Input Ignition switch ON or START Battery voltage
16 GRAir massage seat power supply
(LOW)OutputIgnition switch
ON or STARTAir massage seat switch
is in LOW positionBattery voltage
Except above 0
17 BRAir massage seat power supply
(HIGH)OutputIgnition switch
ON or STARTAir massage seat switch
is in HIGH positionBattery voltage
Except above 0
18 LG Ground — — 0
Symptom Diagnoses procedureReference
page
Front air massage seat dose not activate.1. Check air massage seat control unit power supplySE-94
2. Check air massage seat control unit power supply and
ground circuit SE-94
3. Check front air massage seat switch circuit SE-95
4. Check air bladder, air pump, air tube.SE-101
5. If the above systems are normal, replace air massage
seat control unitSE-90
Low function of front air massage seat dose not activate.1. Check front air massage seat switch circuit check
(LOW position circuit)SE-952. Check air bladder, air pump, air tube.SE-101
3. If the above systems are normal, replace air massage
seat control unit SE-90
High function of front air massage seat dose not activate.1. Check front air massage seat switch circuit check
(HIGH position circuit)SE-952. Check air bladder, air pump, air tube.SE-101
3. If the above systems are normal, replace air massage
seat control unit SE-90
Page 3350 of 3502

SE-94
AIR MASSAGE SEAT
Check Air Massage Seat Control Unit Power Supply BIS00142
1. CHECK FUSE
Check the following fuse.
OK or NG
OK >> Check power supply harness.
NG >> If fuse is blown, be sure to eliminate cause of malfunction before installing new fuse, refer to PG-
3, "POWER SUPPLY ROUTING CIRCUIT" .
Check Air Massage Seat Control Unit Power Supply and Ground Circuit BIS00145
1. CHECK AIR MASSAGE SEAT CONTROL UNIT POWER SUPPLY CIRCUIT
1. Turn ignition switch ON.
2. Check voltage between air massage seat control unit harness
connector B320 terminal 15 and ground.
OK or NG
OK >> GO TO 2.
NG >> Check harness between air massage seat control unit
and fuse block.
2. CHECK AIR MASSAGE SEAT CONTROL UNIT GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect air massage seat control unit connector.
3. Check continuity between air massage seat control unit harness
connector B320 terminal 18 and ground.
OK or NG
OK >> Air massage seat control unit power supply and ground
circuit are OK.
NG >> Repair or replace harness.
Component parts Fuse No. Ampere
Fuse block (J/B) 15 15A
15 (L) – Ground : Battery voltage.
PIIB8706E
18 (LG) – Ground : Continuity should exist.
PIIB2090E
Page 3351 of 3502

AIR MASSAGE SEAT
SE-95
C
D
E
F
G
H
J
K
L
MA
B
SE
Check Front Air Massage Seat Switch Circuit BIS00146
1. CHECK FRONT AIR MASSAGE SEAT SWITCH CIRCUIT 1
1. Turn ignition switch OFF.
2. Disconnect front air massage seat switch connector.
3. Turn ignition switch ON.
4. Check voltage between front air massage seat switch harness
connector M90 terminal 1 and ground.
OK or NG
OK >> GO TO 2.
NG >> Check harness between front air massage seat switch
and fuse block.
2. CHECK FRONT AIR MASSAGE SEAT SWITCH CIRCUIT 2
1. Turn ignition switch OFF.
2. Connect front air massage seat switch connector.
3. Turn ignition switch ON.
4. Check voltage between front air massage seat switch harness
connector and ground.
OK or NG
OK >> GO TO 4.
NG >> GO TO 3.
3. CHECK FRONT AIR MASSAGE SEAT SWITCH
1. Turn ignition switch OFF.
2. Disconnect front air massage seat switch connector.
3. Check continuity between front air massage seat switch termi-
nals.
OK or NG
OK >> GO TO 4.
NG >> Replace front air massage seat switch.1 (GR) – Ground : Battery voltage.
PIIB2085E
ConnectorTerminals
(Wire color)
Switch conditionVoltage [V]
(Approx.)
(+) (-)
M902 (BR/Y)
GroundLOW position
Battery voltage
3 (LG/R) HIGH position
PIIB2086E
Terminal Switch condition Continuity
1 - 2LOW position. Yes
Except above. No
1 - 3HIGH position. Yes
Except above. No
PIIB2087E
Page 3352 of 3502
SE-96
AIR MASSAGE SEAT
4. CHECK FRONT AIR MASSAGE SEAT SWITCH CIRCUIT (CONTINUITY)
1. Turn ignition switch OFF.
2. Disconnect air massage seat control unit connector.
3. Check continuity between front air massage seat switch harness
connector M90 terminal 2, 3 and air massage seat control unit
harness connector B320 terminal 16, 17.
4. Check continuity between front air massage seat switch harness
connector M90 terminal 2, 3 and ground.
OK or NG
OK >> Check harness connection.
If it is OK, replace air massage seat control unit.
If it is NG, repair or replace malfunction part.
NG >> Repair or replace harness.LOW
2 (BR/Y) – 16 (GR) : Continuity should exist.
HIGH
3 (LG/R) – 17 (BR) : Continuity should exist.
LOW
2 (BR/Y) - Ground : Continuity should not exist.
HIGH
3 (LG/R) - Ground : Continuity should not exist.
PIIB2091E