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Home >> Dodge and Ram >> 2024 >> ProMaster 2500 Base >> Repair and Diagnosis >> Accessories & Equipment >> Entertainment Systems >> Audio (Radio) (ETM) - DTCS B15A1-00 To U0140-00 >> DTC Troubleshooting >> B280B-00 NTSC Video Input >> Diagnostic Test

Diagnostic Test

  1. CHECK FOR AN ACTIVE DTC 
    1. With the scan tool, read Radio DTCs and record on the repair order.
    2. With the scan tool, erase DTCs.
    3. Turn the ignition on.
    4. Turn the Radio on.
    5. With the scan tool, read Radio DTCs.

      Did the DTC return?

      Yes 

      • Go To  2

      No 

  2. CHECK THE (FUSED B+) POWER SUPPLY TO THE FUSE FOR THE REAR VIDEO CAMERA 
    NOTE:

    Make sure the battery voltage is between 10.0 and 16.0 volts. 

    1. Using a 12-volt test light connected to ground, check the voltage supply to the related fuse in the BCM.

      Does the test light illuminate brightly?

      Yes 

      • Go To  3

      No 

  3. ISOLATE AND LOAD TEST ALL POWER SUPPLY (FUSED B+/IGNITION) RELATED CIRCUITS TO THE REAR VIDEO CAMERA FOR A SHORT TO GROUND, OPEN, OR HIGH RESISTANCE 
    1. Check the fuse for an open. If the fuse is open, make sure to check for a short to ground prior to replacing the fuse.
    2. The ignition must be off when performing a load test on a circuit.
    3. Isolate the circuit(s) by disconnecting the Electronic Control Unit (ECU) and all other harness connectors containing the circuit(s) being tested.
    4. Connect the positive lead of the load test tool to the positive side of the Battery (A). Refer to the diagram below.
    5. Using an approved back probe tool, connect the negative lead of the load test tool to the circuit being tested at the ECU harness connectors (B).
    6. Using an approved back probe tool and a fused jumper wire, connect the circuit being tested to the negative side of the Battery or a known good ground at the other ECU/Power Distribution Center (PDC) harness connector (C and D).
    7. The bulb on the load test tool should be illuminated and bright if there is no resistance in the circuit.
      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: 

      • 1. 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.
      • 2. Compare the voltage drop across the bulb to the voltage reading across the Battery terminals.
      • 3. 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.
      Example: 2.0 Ohms of resistance in the circuit being tested will cause the voltage measurement across the bulb to be 25% less than when compared to Battery voltage. The reason for this is that the 2.0 Ohms in the circuit makes up 25% of the total circuit resistance of 8.0 Ohms. 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 .

      WARNING:

      To avoid possible serious or fatal injury, DO NOT load test any air bag/restraint system components or circuits using the procedures listed here. Refer to the Service Information for proper air bag/restraint system testing procedures. 

      CAUTION:

      Do not load test any circuits with components still connected to the circuit. 

      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. 

      GC0174954Courtesy of CHRYSLER GROUP, LLC

      Is the load test bulb illuminated and bright?

      Yes 

      • Go To  4

      No 

  4. CHECK THE GROUND CIRCUIT(S) TO THE REAR VIDEO CAMERA BY LOAD TESTING THE CIRCUIT FOR AN OPEN OR HIGH RESISTANCE 
    1. Disconnect the ECU harness connector to isolate the ground circuit(s).
    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 at the ECU 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: 

      • 1. 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.
      • 2. Compare the voltage drop across the bulb to the voltage reading across the Battery terminals.
      • 3. 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.
      Example: 2.0 Ohms of resistance in the circuit being tested will cause the voltage measurement across the bulb to be 25% less than when compared to Battery voltage. The reason for this is that the 2.0 Ohms in the circuit makes up 25% of the total circuit resistance of 8.0 Ohms. 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:

      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  5

      No 

  5. CHECK THE (X970), (X971) AND (X972) RADIO CIRCUITS FOR A SHORT TO VOLTAGE IN THE HARNESS 
    1. Turn the ignition off.
    2. Disconnect the Radio C1 harness connectors.
    3. Disconnect the Camera harness connector.
    4. Turn the ignition on.
    5. Check for voltage present on the (X970), (X971) and (X972) Camera circuits at the Camera harness connector.

      Is there any voltage present?

      Yes 

      No 

      • Go To  6
  6. CHECK THE (X970), (X971) AND (X972) CAMERA CIRCUITS FOR A SHORT TO GROUND IN THE HARNESS 
    1. Turn the ignition off.
    2. Disconnect the Radio harness C1 connector.
    3. Disconnect the Camera harness connector.
    4. Turn the ignition on.
    5. Check for continuity between ground and the (X970), (X971) and (X972) Camera circuits at the Radio harness C1 connector.

      Is there continuity between ground and the (X970), (X971) and (X972) Camera circuits?

      Yes 

      No 

      • Go To  7
  7. CHECK THE (X970), (X971) AND (X972) CAMERA CIRCUITS FOR A SHORT TOGETHER 
    1. Disconnect the Radio harness C1 connector.
    2. Check for continuity between the (X970), (X971) and (X972) Camera circuits at the Radio C1 harness connector.

      Is there continuity between the (X970), (X971) and (X972) Camera circuits?

      Yes 

      No 

      • Go To  8
  8. CHECK THE (X970), (X971) AND (X972) CAMERA CIRCUITS FOR AN OPEN IN THE HARNESS 
    1. Turn the ignition off.
    2. Measure the resistance of the (X970), (X971) and (X972) Camera circuits between the Camera harness connector and the Radio C1 harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  9

      No 

  9. REPLACE THE BACK UP CAMERA 
    1. Replace the Backup Camera in accordance with the service information.
    2. With the scan tool, erase DTCs.
    3. Turn the ignition on.
    4. Turn the Radio on.
    5. With the scan tool, read DTCs.

      Did the DTC return?

      Yes 

      • Go To  10

      No 

  10. CHECK RELATED HARNESS CONNECTIONS 
    1. Disconnect all Radio harness connectors.
    2. Disconnect all related in-line harness connections (if equipped).
    3. Disconnect the related component harness connectors.
    4. 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.

    5. Reconnect all Radio harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
    6. Reconnect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
    7. Reconnect all related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
    8. With the scan tool, erase DTCs.
    9. Using the recorded Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
    10. With the scan tool, read Radio DTCs.

      Did the DTC return?

      Yes 

      No 

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