Subaru 2009 IMPREZA Service Manual page 3105

SEATS
4. Seat Heater System
A: REMOVAL
1. SEAT HEATER UNIT
1) Remove the front seats. <Ref. to SE-6, REMOV-
AL, Front Seat.>
2) Remove the backrest cover of front seat and
seat cushion cover. <Ref. to SE-6, DISASSEM-
BLY, Front Seat.>
3) Remove the seat heater unit.
2. SEAT HEATER SWITCH
1) Remove the console box. <Ref. to EI-48, RE-
MOVAL, Console Box.>
2) Remove the seat heater switch from the console
box.
B: INSTALLATION
Install in the reverse order of removal.
Seat Heater System
C: INSPECTION
1. WIRING DIAGRAM
<Ref. to WI-99, WIRING DIAGRAM, Seat Heater
System.>
2. SEAT HEATER UNIT
Disconnect the seat heater unit connector, and
check the continuity between terminals of connec-
tor.
Connector & terminal
No. 1 — No. 3:
No. 1 — No. 4:
No. 3 — No. 4:
SE-00082
If no continuity exists, replace the seat heater unit
with a new part.
3. SEAT HEATER SWITCH
• CHECK THERMISTOR OUTPUT VOLTAGE
1) Connect the battery to the connector.
Connector terminals No. 2 (+):
2) Measure the voltage between connector and
chassis ground.
Connector & terminal:
LHD side seat
(R43) No. 4 (+) — Chassis ground (–):
RHD side seat
(R42) No. 4 (+) — Chassis ground (–):
If voltage is not 1.5 V or more, replace the seat
heater switch.
• CHECK SWITCH OUTPUT VOLTAGE
1) Connect the battery to the connector.
Connector terminals No. 2 (+):
2) Measure the voltage between connector and
chassis ground while turning the switch to ON.
Connector & terminal:
LHD side seat
(R43) No. 3 (+) — Chassis ground (–):
RHD side seat
(R42) No. 3 (+) — Chassis ground (–):
If voltage does not change from 10 V or more to ze-
ro, replace the seat heater switch.
SE-14
2 1
3
4
SE-00765