Seat Temperature Element: Testing and Inspection

INSPECTION

1. WIRING DIAGRAM

Refer to "Seat Heater System"in the wiring diagram. [Ref. to WIRING DIAGRAM, Seat Heater System.]

2. DIAGNOSTIC CHART







3. CHECK SEAT HEATER FUSE

Remove the seat heater fuse and inspect visually.

Is the fuse blown out?
- Yes -> Replace the fuse.
- No -> Check the power supply and ground circuits.

4. CHECK SEAT HEATER RELAY

1. Remove the seat heater relay from the relay holder.
2. Measure the resistance between seat heater relay terminals.

Preparation tool: Circuit tester







3. Replace the seat heater relay if the inspection result is not within the standard.

5. CHECK POWER SUPPLY AND GROUND CIRCUIT

1. Check power supply circuit
1. Disconnect the harness connector of seat heater switch.
2. Turn the ignition switch to ON.
3. Measure the voltage between harness connector terminal and chassis ground.

Connector & terminal
(R43) No. 7 (+) - Chassis ground (-):

Is the voltage 12 V or more?
- Yes -> Go to step 2.
- No -> Check the harness between the seat heater switch and fuse.

2. Check ground circuit
Measure the resistance between harness connector terminal and chassis ground.

Connector & terminal
(R43) No. 2 - Chassis ground:

Is the resistance less than 10 Ohms?
- Yes -> Go to step 3.
- No -> Repair the harness.

3. Check ground circuit
Measure the resistance between seat heater switch terminals.

Connector & terminal
(R43) No. 7 - (R43) No. 2:

Is the resistance less than 10 Ohms?
- Yes -> The power supply and ground circuits are normal.
- No -> Replace the seat heater switch.

6. SEAT HEATER UNIT

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

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

LOW
No. 1 - No. 4:







2. If no continuity exists, replace the seat heater module with a new part.

7. SEAT HEATER SWITCH

1. Inspect the continuity between the seat heater switch terminals.







Connector & terminal
HI
No. 7 - No. 2:
No. 7 - No. 4:
No. 7 - No. 8:

LOW
No. 7 - No. 1:
No. 7 - No. 2:
No. 7 - No. 3:

2. If no continuity exists, replace the seat heater switch with a new part.