Seat Temperature Element: Testing and Inspection

SEAT HEATER SYSTEM

INSPECTION

1. WIRING DIAGRAM

[Ref. to WI-99, WIRING DIAGRAM, Seat Heater System.] Diagrams By Diagram Name

2. SEAT HEATER UNIT

Disconnect the seat heater unit connector, check the continuity between terminals of connector.

Connector & terminal
No.1 - No.3:
No.1 - No.4:
No.3 - No.4:







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 zero, replace the seat heater switch.