Aura L4-2.4L (2008)
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 5 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. Disconnect the harness connector C1 at the appropriate heated seat module.
4. Test for less than 1 ohm between the ground circuit terminal 1 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.
6. 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.
7. Press and release the heated seat switch. Verify that a test lamp illuminates between the control circuit terminal 2 and ground each time the switch
is pressed.
‹› If the test lamp does not illuminate 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 switch.
‹› If the test lamp remains illuminated, test the control circuit for an short to voltage. If the circuit test normal test or replace the switch.
8. Ignition OFF, connect the harness connector at the heated seat module. Disconnect the harness connector at the appropriate heated seat
element-cushion.
9. Test for 1200-10K ohms between the signal circuit terminal 3 and the low reference circuit terminal 2.
‹› If not within the specified range, test the signal and low reference circuits for a short to ground or open/high resistance. If the circuits test
normal, test or replace the heated seat element - cushion.
10. Test for 8-15 ohms between the control circuit terminal 4 and the supply voltage circuit terminal 1.
‹› If not within the specified range, test the control and supply voltage circuits for a short to ground or open/high resistance. If the circuits test
normal, test or replace the heated seat element - cushion.
11. Connect the harness connector at the heated seat element-cushion. Disconnect the harness connector at the appropriate heated seat element-back.
12. Test for 8-15 ohms between the control circuit terminal 1 and the supply voltage circuit terminal 2.
‹› If not within the specified range, test the control and supply voltage circuits for a short to ground or open/high resistance. If the circuits test
normal, test or replace the heated seat element - back.
13. If all circuits test normal, replace the heated seat module.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Diagnostic Trouble
Code Tests and Associated Procedures/Verification Tests and Procedures) after completing the diagnostic procedure.
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Driver Seat and Passenger Seat Back Cushion Heater Replacement (See: Service and Repair/Driver Seat and Passenger Seat Back Cushion Heater
Replacement)
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Heated Seat Switch Replacement (See: Seat Heater Switch/Service and Repair)
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Front Seat Heater Control Module Replacement (See: Seat Heater Control Module/Service and Repair)
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Driver Seat Cushion Heater Replacement (See: Service and Repair/Driver Seat Cushion Heater Replacement)
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Passenger Seat Cushion Heater Replacement (See: Service and Repair/Passenger Seat Cushion Heater Replacement)
