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HOMESERVICE MANUALSDODGE AND RAM2024PROMASTER 3500 BASE, CUTAWAYREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 42 (BRAKE SYSTEM CONTROL MODULE (BSCM) - DTCS U1106-00 TO U35B9-00)DTC TROUBLESHOOTINGU3008-00 CONTROL MODULE GROUND "A"DIAGNOSTIC TEST
2024 Dodge and Ram ProMaster 3500 Base, Cutaway

Diagnostic Test

2024 Dodge and Ram ProMaster 3500 Base, CutawaySECTION Diagnostic Test
WARNING: This page is about a different car, the 2024 RAM ProMaster EV. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FOR AN ACTIVE DTC 
    1. Perform any Service Bulletins that may apply.
    2. Turn the ignition on.
    3. With the scan tool, read BSCM DTCs and record on the repair order.
    4. With the scan tool, read and record Environmental Data to help identify the conditions in which the DTC was set.
    5. With the scan tool, erase BSCM DTCs.
    6. Start the engine and allow it to idle for 5 minutes.
    7. With the scan tool, read BSCM DTCs.

      Did the DTC return?

      Yes 

      • Go To Next Step.

      No 

  2. CHECK THE BRAKE SYSTEM CONTROL MODULE (BSCM) FUSES 
    1. Turn the ignition on.
    2. With a 12-volt test light connected to ground, check the F23 (10A), F86 (50A) and F88 (50A) Fuses for power.

      Does the test light illuminate brightly?

      Yes 

      • Go To Next Step.

      No 

      • If the related fuse is open, check the circuit for a short to ground
      • Perform the BSCM VERIFICATION TEST. Refer to BSCM VERIFICATION TEST .
  3. CHECK THE GROUND CIRCUITS FOR HIGH RESISTANCE BY LOAD TESTING THE CIRCUIT 
    1. Disconnect the BSCM harness connector to isolate the ground circuit.
    2. Connect the positive lead of the load test tool to the positive side of the Battery.
    3. Connect the negative lead of the load test tool to the Ground circuits at the component harness connector (A). Note:  refer to the diagram below.
    4. The bulb on the load test tool should be illuminated and bright if there is no resistance in the circuitry.
      NOTE:

      Why load test a circuit? A load test is used to determine if a circuit is capable of carrying the amperage needed to perform properly. The 3156 bulb in the load tool illustrated, is a simple but effective method of testing circuit functionality. A 3156 Bulb has approximately 6.0 Ohms of resistance when the bulb is powered and draws approximately 2.0 amps of current. Read the CIRCUIT LOAD TESTING PROCEDURE for information on building a simple load test tool and for additional load testing information and alternative methods of load testing or voltage drop testing a circuit. Refer to  CIRCUIT LOAD TESTING PROCEDURES  . 

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.