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Home >> Dodge and Ram >> 2023 >> ProMaster 2500 >> Repair and Diagnosis >> Accessories & Equipment >> Infotainment >> Audio (Radio) (ETM) - DTCS B1400-11 To B157A-13 >> DTC Troubleshooting >> B156B-1A-Satellite Radio Antenna - Circuit Resistance Below Threshold >> Diagnostic Test

Diagnostic Test

  1. CHECK THE ANTENNA CONNECTION 
    1. Turn the ignition off.
    2. Disconnect the Satellite Radio Antenna connections.
    3. Inspect the Satellite Radio Antenna connections.

      Are the Antenna connections clean and secure?

      Yes 

      • Go To  2

      No 

      • Repair the Antenna connection as needed.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  2. CHECK THE ANTENNA AND CABLE 
    1. Connect the Radio Diagnostic Tool to the Satellite Antenna connection on the back of the Radio.

      (special tool #9977-6-SATXM, Antenna, Satellite/Sirus XM)

    2. Make sure one of the front doors is still open.
    3. Using the scan tool, erase the DTCs.
    4. Turn the ignition on.
    5. Turn the Radio on.
    6. Using the scan tool, read the active Radio DTCs.
      NOTE:

      While using the 9977-6-SAT test antenna the GPS reception will not be available and GPS faults may occur. The 9977-6-SAT test tool will only enable satellite radio reception to work. For GPS reception concerns use test antenna 9977-6-GPS-GLO.

      Does the scan tool display: B156B-1A -SATELLITE RADIO ANTENNA-CIRCUIT RESISTANCE BELOW THRESHOLD as active?

      Yes 

      • Replace the Radio in accordance with the Service Information.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

      No 

      • Go To  3
  3. TEST THE SATELLITE ANTENNA CABLE 
    1. Disconnect the Satellite Antenna cable at the Satellite Antenna.
    2. Connect the appropriate Radio Diagnostic Tool adapter to the Satellite Antenna cable at the back of the Radio.

      (special tool #9977-6-1, Adapter) or (special tool #9977-6-3, Adapter)

    3. Connect the appropriate Radio Diagnostic Tool jumper to the Satellite Antenna cable at the Satellite Antenna.

      (special tool #9977-6-4, Jumper) or (special tool #9977-6-2, Jumper)

    4. Measure the Resistance across the terminals on the tool.

      Is the resistance below 47.5 Ohms?

      Yes 

      • Use the Radio Diagnostic Tool to locate the short together, repair or replace the Satellite Antenna cable as necessary.

        (special tool #9977-6, Kit, Radio Antenna Diagnostic)

      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

      No 

      • Replace the Satellite Antenna in accordance with the Service Information.

        Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

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