Pinpoint Test AE: U0258:87 Or U1A00:00

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

AE1 CHECK IF THE RTM (RADIO TRANSCEIVER MODULE) AND THE BCM (BODY CONTROL MODULE) PASS THE NETWORK TEST
- Ignition ON.
- Using a diagnostic tool, perform the network test.
Does the RTM and the BCM pass the network test?

Yes GO to AE2

No REFER to: Communications Network .

AE2 CHECK THE LIN (LOCAL INTERCONNECT NETWORK) CIRCUIT FOR A SHORT TO VOLTAGE

NOTE: It is necessary to place the passive key in the backup starting location to transition the ignition on. To identify the backup starting location, refer to and "backup slot" in the Owner's Literature.

Ignition OFF.

Disconnect: RTM C9026.

Disconnect: BCM C2280D.

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C9026-2	Courtesy of FORD MOTOR COMPANY	Ground

Is any voltage present?

Yes	REPAIR the circuit.

GO to AE3

AE3 CHECK THE LIN (LOCAL INTERCONNECT NETWORK) CIRCUIT FOR A SHORT TO GROUND

Ignition OFF.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C9026-2	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance greater than 10, 000 ohms?

Yes

GO to AE4

No	REPAIR the circuit.

AE4 CHECK THE LIN (LOCAL INTERCONNECT NETWORK) CIRCUIT FOR AN OPEN

Measure:

Positive Lead	Measurement / Action	Negative Lead
C9026-2	Courtesy of FORD MOTOR COMPANY	C2280D-33

Is the resistance less than 3 ohms?

Yes

GO to AE5

No	REPAIR the circuit.

AE5 CHECK FOR CORRECT RTM (RADIO TRANSCEIVER MODULE) OPERATION

Disconnect and inspect the RTM 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 RTM 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 RTM. TEST the system for normal operation. If the concern is still present, GO to AE6

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.

AE6 CHECK FOR CORRECT BCM (BODY CONTROL MODULE) OPERATION

Disconnect and inspect all the BCM connectors.

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 connectors and make sure they seat and latch 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.