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Home >> Jeep >> 2013 >> Compass Limited, AWD, Trans Mfr CD CVT2 >> Repair and Diagnosis >> External Pages >> Different car >> Section 180 (Driver Door Module (DDM) (DMFL/R) - Electrical Diagnostics) >> DTC Troubleshooting >> B1858-Driver Window Position Sensor Power Supply Low >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2012 Jeep Liberty. However, it is still accessible from the selected car via links, so may be relevant.
  1. TEST FOR INTERMITTENT CONDITION 
    1. Turn the ignition on.
    2. With the scan tool, record and erase the DTCs
    3. Operate the Driver Window up and down several times.
    4. Wait 30 seconds.
    5. With the scan tool, read the DTCs.

      Does the scan tool display B1858-DRIVER WINDOW POSITION SENSOR POWER SUPPLY LOW?

      Yes 

      • Go To  2.

      No 

      • The conditions that caused this code to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  2. WINDOW MOTOR SHORTED 
    Fig 1: Checking Window Motor For A Short
    GC0096495Courtesy of CHRYSLER GROUP, LLC
    1. With the scan tool, erase the DTC's.
    2. Turn the ignition off.
    3. Disconnect the Driver Window Motor connector.
    4. Turn the ignition on.
    5. Operate the driver window switch up and down several times.
    6. With the scan tool, read the DTCs.

      Does the scan tool display B1858-DRIVER WINDOW POSITION SENSOR POWER SUPPLY LOW?

      No 

      • Replace the Window Motor (regulator) in accordance with the Service Information.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

      Yes 

      • Go To  3.
  3. (Q305) DRIVER WINDOW HALL SENSOR SUPPLY CIRCUIT SHORT TO GROUND 
    Fig 2: Checking Driver Window Hall Sensor Supply Circuit For A Short To Ground
    GC0090038Courtesy of CHRYSLER GROUP, LLC
    1. Turn the ignition off.
    2. Disconnect the Driver Door Module C4 connector.
    3. Measure the resistance between Ground and the (Q305) Driver Window Hall Sensor Supply circuit.

      Is the resistance below 1, 000 ohms?

      Yes 

      • Repair the (Q305) Driver Window Hall Sensor Supply circuit for a short to ground.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

      No 

      • Replace the Driver Door Module in accordance with the Service Information.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
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