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Home >> Ford >> 2022 >> Transit Connect Titanium, Gas/Ethanol >> Repair and Diagnosis >> External Pages >> Different car >> Section 596 (Handles, Locks, Latches And Entry Systems) >> Diagnosis And Testing >> Locks, Latches and Entry Systems >> Pinpoint Tests >> Pinpoint Test U: U0258:87 Or U1A00:00

Pinpoint Test U: U0258:87 Or U1A00:00

WARNING: This page is about a different car, the 2021 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
  1. Refer to REMOTE KEYLESS ENTRY AND ALARM for schematic and connector information.

    Normal Operation and Fault Conditions 

    The RTM communicates with the BCM over a LIN-based circuit and, when the network is awake, over the CAN.

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    BCM U0258:87 Lost Communication With Radio Transceiver: Missing Message Sets when the BCM detects a communication fault with the RTM over the LIN-based circuit.
    RTM U1A00:00 Private Communication Network: No Sub Type Information Sets when the RTM detects a fault with the LIN-based circuit to the BCM.

    Possible Sources 

    • Wiring, terminals or connectors
    • RTM
    • BCM

  2. U1 CHECK IF THE RTM (RADIO TRANSCEIVER MODULE) AND THE BCM (BODY CONTROL MODULE) PASS THE NETWORK TEST

    • Ignition ON.

    • Using a diagnostic tool, carry out the network test.

    Does the RTM and the BCM pass the network test? 

    Yes  GO to  U2
    No  REFER to: ETHERNET MODULE COMMUNICATIONS NETWORK .

  3. U2 CHECK THE LIN (LOCAL INTERCONNECT NETWORK) CIRCUIT FOR A SHORT TO VOLTAGE

    • Ignition OFF:

    • Disconnect RTM C9026.

    • Disconnect BCM C2280B.

    • Ignition ON:

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C9026-2
      GFD561509Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPAIR the circuit.
    No  GO to  U3

  4. U3 CHECK THE LIN (LOCAL INTERCONNECT NETWORK) CIRCUIT FOR A SHORT TO GROUND

    • Ignition OFF.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C9026-2
      GFD561510Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to  U4
    No  REPAIR the circuit.

  5. U4 CHECK THE LIN (LOCAL INTERCONNECT NETWORK) CIRCUIT FOR AN OPEN

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C9026-2
      GFD561510Courtesy of FORD MOTOR COMPANY
      		 C2280B-26

    Is the resistance less than 3 ohms? 

    Yes  GO to  U5
    No  REPAIR the circuit.

  6. U5 CHECK FOR CORRECT RTM (RADIO TRANSCEIVER MODULE) OPERATION

    • Disconnect and inspect the BCM connector.

    • Repair:

      • corrosion (install new connectors or terminals - clean module pins)
      • damaged or bent pins - install new terminals pins
      • pushed-out pins - install new pins as necessary

    • Reconnect the BCM connector and make sure it seats and latches correctly.

    • Operate the system and determine if the concern is still present.

    Is the concern still present? 

    Yes  CHECK OASIS for any applicable service articles: TSB, GSB, SSM, or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new BCM. REFER to: Body Control Module (BCM) .
    No  The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.
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