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HOMESERVICE MANUALSJEEP2024GRAND CHEROKEE L LIMITED, RWDREPAIR AND DIAGNOSISBRAKESTRACTION CONTROLBRAKE SYSTEM CONTROL MODULE (BSCM) - DTCS U0594-00 TO U3009-00DTC TROUBLESHOOTINGU3007-00-CONTROL MODULE INPUT POWER "B" CIRCUIT/OPENDIAGNOSTIC TEST
2024 Jeep Grand Cherokee L Limited, RWD

Diagnostic Test

2024 Jeep Grand Cherokee L Limited, RWDSECTION Diagnostic Test
  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  2

      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  3

      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 (F942) FUSED IGNITION CIRCUIT FOR HIGH RESISTANCE BY LOAD TESTING THE CIRCUIT 
    1. Disconnect the harness connector to isolate the 12.0 volt supply circuit.
    2. Connect the positive lead of the load test tool to the 12.0 volt supply circuit at the BSCM harness connector (A). Note:  refer to the diagram below.
    3. Connect the negative lead of the load test tool to the ground circuit of the Battery or a good chassis ground.
    4. Make sure that the circuit being tested is being powered on. If the 12.0 volt circuit being tested is an ignition feed for example, the ignition must be on. If testing an output from a relay, verify that the relay is energized and on.
    5. 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 VOLTAGE DROP TEST PROCEDURE and 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.