Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Sienna 2004-2007 Approved SRM 36 72 20twy i740001
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72-60
SEAT - SEAT HEATER SYSTEM
720IX-01
INSPECTION
1. INSPECT SEAT HEATER SWITCH LH
(a) Measure the resistance of the seat heater switch when
the switch is operated.
ON 42_ Standard:
Tester Connection Switch Condition Specified Condition
21_ ON
OFF 2-3 2.72 to 4.08 k
(min.)
ON
2-3 0.28 to o.42 k
(max.)
ON
3-4 Below 1
(min.)
ON
3-4 Below 1
(k) (max.)
2.72 to 4.08 2-3 OFF 10 k or higher
3-4 OFF 10 k or higher
If the result is not as specified, replace the switch.
0.28 to 0.42 HINT:
As the dial is being turned, the resistance changes gradually.
0 21 63 (_)
OFF ON (Min.) ON (Max.)
B87782
(b) Push the seat heater switch ON and check that the seat
heater switch indicator illuminates when the switch is op-
erated.
L
OK:
Measurement Condition Switch Condition Specified Condition
Battery positive (+) Terminal 3
ON Illuminates
Battery negative (-) Terminal 1
If the result is not as specified, replace the switch.
B68335
(c) Check the seat heater switch illumination.
OK:
Measurement Condition Switch Condition Specified Condition
L
Battery positive (+) Terminal 6
Always Illuminates
Battery negative (-) Terminal 5
If the result is not as specified, replace the seat heater switch
or bulb.
B65621
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 3306
72-61
SEAT - SEAT HEATER SYSTEM
2. INSPECT SEAT HEATER SWITCH RH
(a) Measure the resistance of the seat heater switch when
the switch is operated.
ON 42_ Standard:
Tester Connection Switch Condition Specified Condition
21_ ON
OFF 2-3 2.72 to 4.08 k
(min.)
ON
2-3 0.28 to o.42 k
(max.)
ON
3-4 Below 1
(min.)
ON
3-4 Below 1
(k) (max.)
2.72 to 4.08 2-3 OFF 10 k or higher
3-4 OFF 10 k or higher
If the result is not as specified, replace the switch.
0.28 to 0.42 HINT:
As the dial is being turned, the resistance changes gradually.
0 21 63 (_)
OFF ON (Min.) ON (Max.)
B87782
(b) Push the seat heater switch ON and check that the seat
heater switch indicator illuminates when the switch is op-
erated.
R
OK:
Measurement Condition Switch Condition Specified Condition
Battery positive (+) Terminal 3
ON Illuminates
Battery negative (-) Terminal 1
If the result is not as specified, replace the switch.
B68335
(c) Check the seat heater switch illumination.
OK:
Measurement Condition Switch Condition Specified Condition
R
Battery positive (+) Terminal 6
Always Illuminates
Battery negative (-) Terminal 5
If the result is not as specified, replace the seat heater switch
or bulb.
B65621
3. INSPECT FRONT SEATBACK HEATER ASSY LH
(a) Measure the resistance of the seatback heater.
Standard:
Tester Connection Condition Specified Condition
1-2 20_C (77_F) 0.4 to 1.4
If the result is not as specified, replace the seatback heater
assy.
B88037
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 3307
72-62
SEAT - SEAT HEATER SYSTEM
4. INSPECT FRONT SEATBACK HEATER ASSY RH
(a) Measure the resistance of the seatback heater.
Standard:
Tester Connection Condition Specified Condition
1-2 20_C (77_F) 0.4 to 1.4
If the result is not as specified, replace the seatback heater
assy.
B88037
5. INSPECT FRONT SEAT CUSHION HEATER ASSY LH
(a) Measure the resistance of the seat cushion heater.
Standard:
A B
Tester Connection Condition Specified Condition
A1 - B1 20_C (77_F) 0.7 to 1.7
A2 - A3 20_C (77_F) 4.5 to 5.5 k
A4 - B2 Always Below 1
If the result is not as specified, replace the seat cushion heater
B88038 assy.
6. INSPECT FRONT SEAT CUSHION HEATER ASSY RH
(a) Measure the resistance of the seat cushion heater.
Standard:
A B
Tester Connection Condition Specified Condition
A1 - B1 20_C (77_F) 0.7 to 1.7
A2 - A3 20_C (77_F) 4.5 to 5.5 k
A4 - B2 Always Below 1
If the result is not as specified, replace the seat cushion heater
B88038 assy.
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 3308
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