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Home >> Jeep >> 2017 >> Compass Trailhawk >> Repair and Diagnosis >> Steering >> Steering Column >> (Comfort Seats And Wheel Module (CSWM) - Electrical Diagnostics) - Mp >> DTC Troubleshooting >> B1EB2-1B-Front Right Seat Heater Sensor - Circuit Resistance Above Threshold >> Diagnostic Test

Diagnostic Test

  1. CHECK FOR AN ACTIVE DTC 
    1. With the scan tool, read Comfort Seat Wheel Module (CSWM)) DTCs and record on the repair order.
    2. With the scan tool, erase CSWM DTCs.
    3. Turn the ignition off.
    4. Turn the ignition on.
    5. With the scan tool, read CSWM DTCs.

      Did the DTC return?

      Yes 

      • Go To  2

      No 

      • Go To  6
  2. CHECK THE (P688) RIGHT FRONT HEATED SEAT TEMP SENSE CIRCUIT FOR A SHORT TO VOLTAGE 
    1. Turn the ignition off.
    2. Disconnect the CSWM C2 harness connector.
    3. Start the Engine.
    4. Measure the voltage between ground and the (P688) Right Front Heated Seat Temp Sense circuit at the CSWM C2 harness connector.

      Is there any voltage present?

      Yes 

      • Repair the (P688) Right Front Heated Seat Temp Sense circuit or the (P968) Heated Seat Sensor Return circuit for a short to voltage.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

      No 

      • Go To  3
  3. CHECK THE HEATED SEAT TEMPERATURE SENSOR RESISTANCE 
    Temperature Sensor Resistance
    °C °F Nominal (Ohms) Minimum (Ohms) Maximum (Ohms)
    -40 -40 336500 306959 366042
    -35 -31 242589 222163 263015
    -30 -22 177000 162706 191294
    -25 -13 130370 120273 140467
    -20 -4 97070 89860 104280
    -15 5 72929 67735 78124
    -10 14 55330 51551 59108
    -5 23 42315 39545 45085
    0 32 32650 30601 34699
    5 41 25388 23861 26914
    10 50 19900 18754 21046
    15 59 15708 14842 16574
    20 68 12490 11831 13149
    25 77 10000 9500 10500
    30 86 8057 7632 8482
    35 95 6531 6173 6889
    40 104 5327 5024 5630
    45 113 4369 4111 4626
    50 122 3603 3384 3822
    55 131 2986 2799 3174
    60 140 2488 2327 2649
    65 149 2083 1945 2221
    70 158 1752 1633 1871
    75 167 1481 1378 1585
    80 176 1258 1168 1348
    85 185 1072 994.2 1151
    90 194 917.7 849.4 986.0
    95 203 788.5 728.6 848.4
    100 212 680.0 627.4 732.6
    1. Turn the ignition off.
    2. Measure the resistance between the (P688) Right Front Heated Seat Temp Sense circuit and the (P968) Heated Seat Sensor Return circuit at the CSWM C2 harness connector.
    3. Compare the measured resistance to the Temperature Sensor Resistance chart.

      Is the resistance within the specifications listed in the chart?

      Yes 

      • Using the schematics as a guide, check the CSWM pins, terminals, and connectors for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits and repair as necessary. If no problems are found, 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 

      • Go To  4
  4. CHECK THE (P688) RIGHT FRONT HEATED SEAT TEMP SENSE CIRCUIT OR AN OPEN 
    1. Disconnect the Right Front Seat Cushion Heater harness connector.
    2. Measure the resistance of the (P688) Right Front Heated Seat Temp Sense circuit between the CSWM C2 harness connector and the Right Front Seat Cushion Heater harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  5

      No 

      • Repair the (P688) Right Front Heated Seat Temp Sense circuit for an open.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  5. CHECK THE (P968) HEATED SEAT SENSOR RETURN CIRCUIT FOR AN OPEN 
    1. Measure the resistance of the (P968) Heated Seat Sensor Return circuit between the CSWM C2 harness connector and the Right Front Seat Cushion Heater harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      No 

      • Repair the (P968) Heated Seat Sensor Return circuit for an open.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  6. CHECK THE WIRING AND CONNECTORS 
    1. The conditions necessary to set the DTC are not present at this time.
    2. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle the wiring and connectors while checking for shorted and open circuits. Attempt to reproduce the condition by adjusting the seat(s).
    3. Check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension. Verify the seat wiring harness is routed correctly to the Comfort Seat Wheel Module (CSWM).
    4. With the scan tool, check for any Environmental Data to help identify the conditions in which the DTC was set.
    5. Check Service Bulletins for any possible causes that may apply.

      Were any problems found?

      Yes 

      No 

      • Test complete.
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