Diagnostic Test

WARNING: This page is about a different car, the 2017 Jeep Cherokee. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FOR AN ACTIVE DTC
1. With the scan tool, read DTCs and record on the repair order.
2. Record the Environmental Data.
3. With the scan tool, erase DTCs.
4. Start the engine.
  NOTE:
  The Heated Steering Wheel should be in the off position and remain off for the results to be valid.
5. Using the recorded Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
6. With the scan tool, read CSWM DTCs.
  Is the same DTC active?
  
  Yes
  - Go To 2
  No
  - Perform the TESTING FOR AN INTERMITTENT CONDITION procedure. Refer to TESTING FOR AN INTERMITTENT CONDITION .
CHECK THE (C91) HEATED STEERING WHEEL FEED AND (C986) RETURN CIRCUITS FOR A SHORT TO VOLTAGE AT THE CSWM C4 HARNESS CONNECTOR
1. Turn the ignition off.
2. Disconnect the CSWM C4 harness connector.
3. Turn the ignition on.
4. Measure the voltage of the (C91) Heated Steering Wheel Feed circuit at the CSWM C4 harness connector.
5. Measure the voltage of the (C986) Heated Steering Wheel Return circuit at the CSWM C4 harness connector.
  NOTE:
  When probing a circuit at an Electronic Control Unit (ECU) connector, always use an appropriate probing tool to prevent any possible damage to the ECU terminals.
  
  Is there voltage present on either circuit?
  
  Yes
  - Go To 3
  No
  - Go To 6
CHECK THE (C91) HEATED STEERING WHEEL FEED AND (C986) RETURN CIRCUITS FOR A SHORT TO VOLTAGE BETWEEN THE CSWM C4 HARNESS CONNECTOR AND THE SCCM C1 HARNESS CONNECTOR
WARNING:
Turn the ignition off, disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury.
1. Remove the Driver Airbag in accordance with the Service Information. Refer to AIR BAG, DRIVER, REMOVAL .
2. Disconnect the SCCM C1 harness connector.
  WARNING:
  Turn the ignition on, then reconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury.
3. Measure the voltage of the (C91) Heated Steering Wheel Feed circuit at the SCCM C1 harness connector.
4. Measure the voltage of the (C986) Heated Steering Wheel Return circuit at the SCCM C1 harness connector.
  NOTE:
  When probing a circuit at an Electronic Control Unit (ECU) connector, always use an appropriate probing tool to prevent any possible damage to the ECU terminals.
  
  Is there voltage present on either circuit?
  
  Yes
  - Repair the circuit(s) for a short to voltage.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 4
CHECK THE (C91) HEATED STEERING WHEEL FEED AND (C986) RETURN CIRCUITS FOR A SHORT TO VOLTAGE WITHIN THE SCCM
1. Turn the ignition off.
2. Disconnect the SCCM C4 harness connector.
3. Turn the ignition on.
4. Measure the voltage of the (C91) Heated Steering Wheel Feed circuit at either SCCM component connector.
5. Measure the voltage of the (C986) Heated Steering Wheel Return circuit at either SCCM component connector.
  NOTE:
  When probing a circuit at an Electronic Control Unit (ECU) connector, always use an appropriate probing tool to prevent any possible damage to the ECU terminals.
  
  Is there voltage present on either circuit?
  
  Yes
  - Replace the Steering Column Control Module (SCCM) in accordance with the Service Information. Refer to MODULE, STEERING COLUMN CONTROL (SCCM), REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 5
CHECK THE (C91) HEATED STEERING WHEEL FEED AND (C986) RETURN CIRCUITS FOR A SHORT TO VOLTAGE BETWEEN THE SCCM C4 HARNESS CONNECTOR AND THE HSW HARNESS CONNECTOR
1. Turn the ignition off.
2. Disconnect the HSW harness connector.
3. Turn the ignition on.
4. Measure the voltage of the (C91) Heated Steering Wheel Feed circuit at the HSW harness connector.
5. Measure the voltage of the (C986) Heated Steering Wheel Return circuit at the HSW harness connector.
  NOTE:
  When probing a circuit at an Electronic Control Unit (ECU) connector, always use an appropriate probing tool to prevent any possible damage to the ECU terminals.
  
  Is there voltage present on either circuit?
  
  Yes
  - Repair the circuit(s) for a short to voltage.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Replace the Heated Steering Wheel (HSW) in accordance with the Service Information. Refer to WHEEL, STEERING, REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK RELATED HARNESS CONNECTIONS
1. Disconnect all CSWM harness connectors.
2. Disconnect all related in-line harness connections (if equipped).
3. Disconnect the related component harness connectors.
4. 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.
  - Check for spread terminals and verify proper terminal tension.
  Repair any conditions that are found.
5. Connect all CSWM harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
6. Connect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
7. Connect all related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
8. With the scan tool, erase DTCs.
9. Test drive or operate the vehicle in accordance with the when monitored and set conditions.
10. 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 .
  - 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 .