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Home >> Dodge and Ram >> 2024 >> ProMaster 2500 Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 40 (Brake System Control Module (BSCM) - DTCS C2112-00 To U0140-00) >> DTC Troubleshooting >> P2534-00 Ignition Switch On/Start Position Circuit Low >> Diagnostic Test

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 
    NOTE:

    This DTC must be active for the results of this test to be valid. 

    1. Perform any Service Bulletins that may apply.
    2. Turn the ignition on.
    3. For future reference, with the scan tool, run and save a vehicle Scan Report and all related recorded data.
    4. With the scan tool, read DTCs and record on the repair order.
    5. With the scan tool, read and record Environmental Data to help identify the conditions in which the DTC was set.
    6. With the scan tool, erase all DTCs.
    7. Cycle the ignition from off to on.
    8. With the scan tool, read BSCM DTCs.

      Did the DTC return?

      Yes 

      • Go To Next Step.

      No 

  2. CHECK FOR BODY CONTROL MODULE (BCM) DTCS 
    1. Refer to the recorded DTCs.

      Are there any BCM DTCs present?

      Yes 

      No 

      • Go To Next Step.
  3. CHECK FOR POWERTRAIN CONTROL MODULE (PCM) DTCS 
    1. Refer to the recorded DTCs.

      Are there any PCM DTCs present?

      Yes 

      • Perform the applicable diagnostic procedure(s). Refer to the appropriate Diagnostic Information .

      No 

      • Go To Next Step.
  4. CHECK THE FUSES FOR POWER 
    1. Turn the ignition on.
    2. Using a 12-volt test light connected to ground, check the F23 (10A) F86 (50A) and F88 (50A) fuses for power.

      Are the fuses good?

      Yes 

      • Go To Next Step.

      No 

      • If the fuses are open, check the related circuits for a short to ground. Note:  Use the wiring diagram as a guide to follow the path of the circuit.
      • Perform the BSCM VERIFICATION TEST. Refer to BSCM VERIFICATION TEST .
  5. ISOLATE AND CHECK THE (F942) FUSED IGNITION CIRCUIT FOR AN OPEN/HIGH RESISTANCE BY LOAD TESTING THE CIRCUIT 
    1. Disconnect the component harness connector to isolate the 12.0 volt supply circuit.
    2. Connect the positive lead of the load test tool to the Fused Ignition circuit at the component 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  CIRCUIT LOAD TESTING PROCEDURES  . 

      NOTE:

      A 12-volt test light can be substituted for the load test tool, but only if the test light draws enough current to effectively load test the circuit. Many high impedance test lights draw very little amperage (less than 0.1 amps) and are not reliable to load test a circuit. To perform a proper load test of a circuit, the tool being used should draw more than approximately 0.75 amps. 

      NOTE:

      Why perform a Voltage Drop Test? To verify with certainty there is not any resistance in the circuit being tested, perform a simple voltage drop test across the 3156 bulb of the load test tool. To do so perform the following: 

      • Connect the leads of a DVOM to the alligator clips on the load test tool while the load test tool is connected in series with the circuit.
      • Compare the voltage drop across the bulb to the voltage reading across the Battery terminals.
      • The voltage dropped across the bulb should be equal to the voltage reading across the Battery terminals if there is no resistance in the circuit being tested. Refer to CIRCUIT LOAD TESTING PROCEDURES
      NOTE:

      When probing a circuit at an Electronic Control Unit (ECU) harness connector, always use an appropriate back probing tool to prevent any possible damage to the ECU terminals. 

      NOTE:

      Compare the brightness of the bulb in the load test tool to that of a direct connection to Battery. 

      GC0174938Courtesy of CHRYSLER GROUP, LLC

      Is the load test bulb illuminated and bright?

      Yes 

      • Go To Next Step.

      No 

      • Repair the 12.0 volt circuit for an open or high resistance.
      • Perform the BSCM VERIFICATION TEST. Refer to BSCM VERIFICATION TEST .
  6. CHECK THE FUSED B(+) CIRCUITS FOR AN OPEN/HIGH RESISTANCE BY LOAD TESTING THE CIRCUIT 
    1. Disconnect the component harness connector to isolate the 12.0 volt supply circuits. Note:  Use the wiring diagram as a guide to follow the path of the circuit.
    2. Connect the positive lead of the load test tool to the 12.0 volt supply circuit at the component 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  CIRCUIT LOAD TESTING PROCEDURES  . 

      NOTE:

      A 12-volt test light can be substituted for the load test tool, but only if the test light draws enough current to effectively load test the circuit. Many high impedance test lights draw very little amperage (less than 0.1 amps) and are not reliable to load test a circuit. To perform a proper load test of a circuit, the tool being used should draw more than approximately 0.75 amps. 

      NOTE:

      Why perform a Voltage Drop Test? To verify with certainty there is not any resistance in the circuit being tested, perform a simple voltage drop test across the 3156 bulb of the load test tool. To do so perform the following: 

      • Connect the leads of a DVOM to the alligator clips on the load test tool while the load test tool is connected in series with the circuit.
      • Compare the voltage drop across the bulb to the voltage reading across the Battery terminals.
      • The voltage dropped across the bulb should be equal to the voltage reading across the Battery terminals if there is no resistance in the circuit being tested. Refer to CIRCUIT LOAD TESTING PROCEDURES
      NOTE:

      When probing a circuit at an Electronic Control Unit (ECU) harness connector, always use an appropriate back probing tool to prevent any possible damage to the ECU terminals. 

      NOTE:

      Compare the brightness of the bulb in the load test tool to that of a direct connection to Battery. 

      GC0174938Courtesy of CHRYSLER GROUP, LLC

      Is the load test bulb illuminated and bright?

      Yes 

      • Go To Next Step.

      No 

      • Repair the Fused (B+) circuit(s) for an open or high resistance.
      • Perform the BSCM VERIFICATION TEST. Refer to BSCM VERIFICATION TEST .
  7. CHECK THE (Z947) GROUND CIRCUIT(S) FOR HIGH RESISTANCE BY LOAD TESTING THE CIRCUIT 
    1. Disconnect the component 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 circuit(s) 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  . 

      NOTE:

      A 12-volt test light can be substituted for the load test tool, but only if the test light draws enough current to effectively load test the circuit. Many high impedance test lights draw very little amperage (less than 0.1 amps) and are not reliable to load test a circuit. To perform a proper load test of a circuit, the tool being used should draw more than approximately 0.75 amps. 

      NOTE:

      Why perform a Voltage Drop Test: To verify with certainty there is not any resistance in the circuit being tested, perform a simple voltage drop test across the 3156 bulb of the load test tool. To do so perform the following: 

      • Connect the leads of a DVOM to the alligator clips on the load test tool while the load test tool is connected in series with the circuit.
      • Compare the voltage drop across the bulb to the voltage reading across the Battery terminals.
      • The voltage dropped across the bulb should be equal to the voltage reading across the Battery terminals if there is no resistance in the circuit being tested. Refer to CIRCUIT LOAD TESTING PROCEDURES
      NOTE:

      When probing a circuit at an Electronic Control Unit (ECU) harness connector, always use an appropriate back probing tool to prevent any possible damage to the ECU terminals. 

      NOTE:

      Compare the brightness of the bulb in the load test tool to that of a direct connection to Battery. 

      GC0174957Courtesy of CHRYSLER GROUP, LLC

      Is the load test bulb illuminated and bright?

      Yes 

      • Go To Next Step.

      No 

      • Repair the Ground circuit(s) for an open or high resistance.
      • Perform the BSCM VERIFICATION TEST. Refer to BSCM VERIFICATION TEST .
  8. CHECK RELATED HARNESS CONNECTIONS 
    1. Turn the ignition off.
    2. Disconnect the BSCM harness connector.
    3. Disconnect all related in-line harness connections (if equipped).
    4. Disconnect the related component harness connectors.
    5. 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.
      • Perform a terminal drag test on each connector terminal to verify proper terminal tension.

      Repair any conditions that are found.

    6. Connect the BSCM harness connector. Be certain that the harness connector is fully seated and the connector lock is fully engaged.
    7. Connect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
    8. Connect the related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
    9. With the scan tool, erase DTCs.
      WARNING:

      To avoid possible serious or fatal injury, check brake capability is available before road testing.

    10. Using the recorded Event and Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
    11. With the scan tool, read BSCM DTCs.

      Did the DTC return?

      Yes 

      No 

      • The wiring or poor connection problem has been repaired.
      • Perform the BSCM VERIFICATION TEST. Refer to BSCM VERIFICATION TEST .
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