The driver and front passenger heated seats are controlled by separate heated seat switches. The switches are located on the center console. When a heated seat switch is pressed, ground is momentarily applied through the switch contacts and the switch signal circuit to the heated seat module. In response to this signal, the heated seat module applies battery voltage through the element supply voltage circuits to the seat cushion and seat back heating elements. The module then supplies a ground through the indicator control circuits to the heated seat switch illuminating the appropriate temperature indicators.

Schematic Reference

Heated/Cooled Seat Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Heated Seats Description and Operation

Electrical Information Reference

1. Ignition ON, cycle the appropriate heated seat switch through the high, medium and low temperature positions. The heated seat should operate in all positions.

⇒	If the heated seat is inoperative or are always ON, refer to Heated Seats Malfunction.

2. Cycle the appropriate heated seat switch through the high, medium and low positions. The heated seat switch temperature indicators should illuminate.

⇒	If the indicators are inoperative or are always ON, refer to Headed Seat Switch Temperature Indicator Malfunction.

Heated Seats Malfunction

1. Ignition OFF, disconnect the harness connector at the appropriate heated seat switch.
2. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 3 and ground.

⇒	If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.

3. Ignition OFF, connect the harness connector at the heated seat switch and disconnect the harness connector at the appropriate heated seat module.
4. Test for less than 5 Ω between the ground circuit terminal 5 and ground.

⇒	If greater than the specified range, test the ground circuit for an open/high resistance.

5. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 4 and ground.

⇒	If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the HTD/SEAT fuse is open, test the control circuit terminal 3 for a short to ground.

6. Verify that a test lamp illuminates between the ignition circuit terminal 10 and ground.

⇒	If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.

7. Connect a test lamp between the signal circuit terminal 2 and ground.
8. Press and release the heated seat switch. The test lamp should turn ON and OFF when the switch is pressed and released.

⇒	If the test lamp is always OFF when the switch is pressed, test the signal circuit for a short to ground or an open/high resistance. If the circuit test normal test or replace the heated seat switch.

⇒	If the test lamp is always ON when the switch is released, test the signal circuit for an short to voltage. If the circuit test normal test or replace the heated seat switch.

9. Ignition OFF, disconnect the harness connector at the seat cushion heater element.
10. Test for less than 5 Ω between the ground circuit terminal 2 and ground.

⇒	If greater than the specified range, test the ground circuit for an open/high resistance.

11. Connect the harness connector at the seat cushion heater element and disconnect the harness connector at the seat back heater element.
12. Test for 1 - 5 Ω between terminal 1 and terminal 4.

⇒	If not within the specified range, test or replace the seat back heater element.

13. Connect the harness connector at the seat back heater element.
14. At the heated seat module harness connector, test for infinite resistance between terminals listed below and ground:

•	Heater element control circuit terminal 3

•	Heated seat temperature sensor signal circuit terminal 1

⇒	If not the specified value, test the appropriate circuit for a short to ground.

15. Ignition ON, verify that a test lamp does not illuminate between the terminals listed below and ground:

•	Heater element control circuit terminal 3

•	Heated seat temperature sensor signal circuit terminal 1

⇒	If the test lamp illuminates, test the appropriate circuit for a short to voltage.

Note:  When measuring resistance, the resistance values are based on the seat being at room temperature of 20°C (68°F).

16. Test for 1.2 k - 30 kΩ between the signal circuit terminal 1 and the low reference circuit terminal 6.

⇒	If less than the specified range, test for a short between the signal and low reference circuits. If the circuits test normal, test or replace the seat back heater element.

⇒	If greater than the specified range, test the signal circuit and the low reference circuit for a short to voltage or open/high resistance. If the circuits test normal, test or replace the seat back heater element.

17. Test for 2 - 5 Ω between the control circuit terminal 3 and the ground circuit terminal 5.

⇒	If less than the specified range, test for a short between the control and ground circuits. If the circuits test normal, test or replace the seat cushion heater element.

⇒	If greater than the specified range, test the control circuit and ground circuit for an open/high resistance. If the circuits test normal, test or replace the seat cushion heater element.

18. If all circuits test normal, replace the heated seat module.

Headed Seat Switch Temperature Indicator Malfunction

1. Ignition OFF, disconnect the harness connector at the appropriate heated seat switch.
2. Test for less than 5 Ω between the ground circuit terminal 2 and ground.

⇒	If greater than the specified range, test the ground circuit for an open/high resistance.

3. Ignition ON, verify that a test lamp illuminates between the control circuit terminal 1 and ground.

⇒	If the test lamp does not illuminate, refer to Interior Backlighting Malfunction.

4. Ignition OFF, connect the harness connector at the heated seat switch and disconnect the harness connector at the heated seat module.
5. Ignition ON, connect a test lamp between the control circuit terminals listed below and ground. The appropriate indicator should turn ON and OFF when the test lamp is connected and disconnected.

•	Low control circuit terminal 9

•	Medium control circuit terminal 8

•	High control circuit terminal 7

⇒	If the indicator is always ON, test the appropriate control circuit for a short to ground. If the circuit tests normal, test or replace the heated seat switch.

⇒	If the indicator is always OFF, test the appropriate control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, test or replace the heated seat switch.

6. If all circuits test normal, replace the heated seat module.

Heated Seat Switch

1. Ignition OFF, disconnect the harness connector at the appropriate heated seat switch switch.
2. Test for infinite resistance between the B+ terminal 3 and the signal terminal 4 with the switch in the open position.

⇒	If not the specified value, replace the heated seat switch switch.

3. Test for less than 2 Ω between the B+ terminal 3 and the signal terminal 4 with the switch in the closed position.

⇒	If greater than the specified range, replace the heated seat switch.

4. Install a 3 A fused jumper wire between B+ and the B+ terminal 3.
5. Connect a test lamp between the control terminals listed below and ground. The appropriate indicator should illuminate.

•	Terminal 7

•	Terminal 8

•	Terminal 9

⇒	If any indicator does not illuminate, replace the heated seat switch.

Seat Heater Elements

1. Ignition OFF, disconnect the harness connector at the seat cushion and seat back heater elements.
2. Test for 1 - 5 Ω between the seat cushion harness connector terminal 2 and the seat back harness connector terminal 1.

⇒	If not within the specified range, replace the seat cushion heater element.

3. Test for 1 - 5 Ω between the seat back harness connector terminal 1 and terminal 4.

⇒	If not within the specified range, replace the seat back heater element.

Note:  When measuring resistance, the resistance values are based on the seat being at room temperature of 20°C (68°F).

4. Test for 1.2 k - 30 kΩ between the seat back harness connector terminal 2 and terminal 3.

⇒	If not within the specified range, replace the seat back heater element.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.