Diagnostic Test

1. With the scan tool, read DTCs in all Electronic Control Units (ECUs) and record on the repair order.
2. With the scan tool, run a vehicle Scan Report, or record the Environmental Data related to the DTCs.
3. With the scan tool, erase all DTCs.
4. Turn the ignition off for a minimum of 10.0 seconds.
5. Start the Engine.
6. Turn the Right Front Heated Seat on.
7. Using the recorded Environmental Data and the When Monitored Conditions, operate the vehicle in the conditions that set the DTC.
8. With the scan tool, read CSWM DTCs.

Is the same DTC active?

Yes 

• Go To  2

No 

• Perform the appropriate INTERMITTENT CONDITION diagnostic procedure. Refer to TESTING FOR AN INTERMITTENT CONDITION .

1. Turn the ignition off.
2. Disconnect the CSWM C3 harness connector.
3. Start the Engine.
4. Measure the voltage between ground and the (P417) Right Front Heated Seat Cushion Temp Sense circuit at the CSWM C3 harness connector.

Is there any voltage present?

Yes 

• Repair the (P417) Right Front Heated Seat Cushion Temp Sense circuit for a short to voltage.
• Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

No 

• Go To  3

1. The ignition must be off when checking the continuity of a circuit.
2. Isolate the circuit by disconnecting the Electronic Control Unit (ECU) and the component harness connector containing the circuit being tested. Note:  Use the appropriate wiring diagram as a guide to follow the path of the circuit.
3. Before measuring the resistance of any circuit, first measure the resistance between the two leads of the DVOM. Note:  The meter leads can add resistance to the measurement value.
4. Connect one lead of the DVOM to the circuit being tested at the component harness connector.
5. Connect the other lead to the circuit being tested at the ECU harness connector and measure the resistance of the circuit.

Is the resistance below 3.0 Ohms?

Yes 

• Go To  4

No 

• Repair the (P417) Right Front Heated Seat Cushion Temp Sense circuit for an open or high resistance.
• Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

1. The ignition must be off when checking the continuity of a circuit.
2. Isolate the circuit by disconnecting the Electronic Control Unit (ECU) and the component harness connector containing the circuit being tested. Note:  Use the appropriate wiring diagram as a guide to follow the path of the circuit.
3. Before measuring the resistance of any circuit, first measure the resistance between the two leads of the DVOM. Note:  The meter leads can add resistance to the measurement value.
4. Connect one lead of the DVOM to the circuit being tested at the component harness connector.
5. Connect the other lead to the circuit being tested at the ECU harness connector and measure the resistance of the circuit.

Is the resistance below 3.0 Ohms?

Yes 

• Go To  5

No 

• Repair the (P419) Heated Seat Sensor Return circuit for an open or high resistance.
• Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

1. Turn the ignition off.
2. Replace the Right Front Heated Seat Cushion Temperature Sensor (Right Front Seat Cushion Heater Element) in accordance with the Service Information. Refer to PAD, HEATER, CUSHION, REMOVAL AND INSTALLATION .
3. Connect the Right Front Heated Seat Cushion Temperature Sensor (Right Front Seat Cushion Heater Element) and CSWM harness connectors.
4. Turn the ignition on.
5. With the scan tool, erase CSWM DTCs.
6. Turn the ignition off for 10.0 seconds.
7. Start the Engine.
8. Turn the Right Front Heated Seat on.
9. Using the Environmental Data or When Monitored Conditions above, operate the vehicle within the conditions that set the DTC.
10. With the scan tool, read CSWM DTCs.

Is the same DTC active?

Yes 

• Go To  6

No 

• Replacing the Right Front Heated Seat Cushion Temperature Sensor (Right Front Seat Cushion Heater Element) repaired the fault.
• Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

1. Turn the ignition off.
2. Disconnect all CSWM harness connectors.
3. Disconnect all related in-line harness connections (if equipped).
4. Disconnect the related component harness connectors.
5. Inspect harness connectors, component connectors, and all male and female terminals for the following conditions:
   • Proper connector installation.
   • Damaged connector locks.
   • Corrosion.
   • Other signs of water intrusion.
   • Weather seal damage (if equipped).
   • Bent terminals.
   • Overheating due to a poor connection (terminal may be discolored due to excessive current draw).
   • Terminals that have been pushed back into the connector cavity.
   • Perform a terminal drag test on each connector terminal to verify proper terminal tension.

   Repair any conditions that are found.

6. Reconnect all CSWM harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
7. Reconnect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
8. Reconnect all related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
9. With the scan tool, erase CSWM DTCs.
10. Turn the ignition off for 10.0 seconds.
11. Start the Engine.
12. Turn the Right Front Heated Seat on.
13. With the scan tool, read CSWM DTCs.

    Is the same DTC active?

    Yes 

    • Replace the Comfort Seat Wheel Module (CSWM) in accordance with the Service Information. Refer to MODULE, COMFORT SEAT AND WHEEL (CSWM), REMOVAL AND INSTALLATION .
    • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

    No 

    • Repairing the wiring harness or connections corrected the problem.
    • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .