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Home >> Jeep >> 2017 >> Wrangler Sahara, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 88 ((Comfort Seat & Wheel Module (CSWM) - Electrical Diagnostics)) >> DTC Troubleshooting >> B1E99-12-Front Left Heater Control Circuit - Circuit Short To Battery >> Diagnostic Test

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.
  1. CHECK FOR AN ACTIVE DTC 
    NOTE:

    Seat and steering wheel heaters must remain OFF during this test.

    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.
    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 

  2. CHECK THE (P187) LEFT FRONT SEAT HEATER CONTROL CIRCUIT FOR A SHORT TO VOLTAGE 
    1. Turn the ignition off.
    2. Disconnect the Comfort Seat Wheel Module (CSWM) C2 harness connector.
    3. Start the Engine.
    4. Measure the voltage between ground and the (P187) Left Front Seat Heater Control circuit in the CSWM C2 harness connector.

      Is the voltage 9.0 volts or above?

      Yes 

      • Repair the (P187) Left Front Seat Heater Control circuit for a short to voltage.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

      No 

      • Go To  3
  3. CHECK THE (P187) LEFT FRONT SEAT HEATER CONTROL CIRCUIT FOR A SHORT TO VOLTAGE DURING SEAT ADJUSTMENT 
    1. Measure the voltage between ground and the (P187) Left Front Seat Heater Control circuit at the CSWM C2 harness connector while adjusting the seat in all positions.

      Is the voltage 9.0 volts or above any time during the seat adjustment?

      Yes 

      • Repair the (P187) Left Front Seat Heater Control circuit for a short to voltage.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

      No 

      • Go To  4
  4. CHECK THE (P187) LEFT FRONT SEAT HEATER CONTROL CIRCUIT FOR A SHORT TO ANOTHER CIRCUIT 
    1. Turn the ignition off.
    2. Disconnect the Left Front Seat Back Heater harness connector.
    3. Disconnect the Left Front Seat Cushion Heater harness connector.
    4. Check for continuity between the (P187) Left Front Seat Heater Control circuit and all other circuits in the CSWM C2 harness connector.

      Is there continuity between the (P187) Left Front Seat Heater Control circuit and any other circuit?

      Yes 

      • Repair the (P187) Left Front Seat Heater Control circuit for a short to another circuit.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

      No 

      • Go To  5
  5. 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 DTCs.

      Is the same DTC active?

      Yes 

      No 

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