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Home >> Dodge and Ram >> 2023 >> ProMaster 2500 >> Repair and Diagnosis >> Accessories & Equipment >> Drivers Assistance Systems - ADAS >> (Active Cruise Control (Acc) Module - Electrical Diagnostics) >> DTC Troubleshooting >> U1700-87-Body Control Module (BCM) - Missing Message >> Diagnostic Test

Diagnostic Test

  1. CHECK FOR AN ACTIVE DTC 
    1. With the scan tool, read RBSS DTCs and record on the repair order.
    2. With the scan tool, erase DTCs.
    3. Cycle the ignition from on to off, wait five seconds and then back to on.
    4. With the scan tool, read RBSS DTCs.

      Did the DTC return?

      Yes 

      • Go To  2

      No 

  2. CHECK THE CAN CIRCUITS FROM THE RBSS TO THE BCM 
    1. Turn the ignition off.
    2. Disconnect the RBSS Module harness connector and the BCM harness connector.
    3. Check the circuits for opens or shorts.

      Are there any circuits shorted or open?

      Yes 

      • Repair the circuits that are open or shorted.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

      No 

      • Go To  3
  3. CHECK BCM AND RBSS HARNESS CONNECTORS 
    1. Check the RBSS and BCM harness connectors.

      Are there any problems with the harness connectors?

      Yes 

      • Restore the correct function of the connector.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

      No 

      • Go To  4
  4. CHECK THE BCM POWER SUPPLY CIRCUITS 
    1. Turn the ignition off.
    2. Disconnect the BCM harness connector.
    3. Check the BCM power supply circuits with a test light.

      Does the test light illuminate brightly?

      Yes 

      • Go To  5

      No 

  5. CHECK THE RBSS POWER SUPPLY CIRCUITS 
    1. Turn the ignition off.
    2. Disconnect the RBSS harness connector.
    3. Check the RBSS power supply circuits with a test light.

      Does the test light illuminate brightly?

      Yes 

      • Go To  6

      No 

      • Repair the RBSS Power supply circuits.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  6. CHECK THE BCM FUNCTIONALITY 
    1. Check for proper operation of the BCM.

      Does the BCM operate correctly?

      Yes 

      • Go To  7

      No 

  7. CHECK THE RBSS FUNCTIONALITY 
    1. Check for proper operation of the RBSS.

      Does the RBSS operate correctly?

      Yes 

      • Test complete.

      No