Pinpoint Test T: The Remote Function Actuator (RFA) Module Does Not Respond To The Scan Tool
Communications Network
Pinpoint Tests
Pinpoint Test T: The Remote Function Actuator (RFA) Module Does Not Respond To The Scan Tool
Refer to Wiring Diagram Set 14, Module Communications Network for schematic and connector information. Diagrams By Number
Normal Operation
The Remote Function Actuator (RFA) module communicates with the scan tool through the High Speed Controller Area Network (HS-CAN). Circuits VDB04 (WH/BU) (HS-CAN +) and VDB05 (WH) (HS-CAN -) provide the HS-CAN connection to the RFA module and circuits VDB06 (GY/OG) (MS-CAN +) and VDB07 (VT/OG) (MS-CAN -) provide the Medium Speed Controller Area Network (MS-CAN) connection to the RFA module. Voltage for the RFA module is provided by circuits SBP12 (GN/RD) and SBP27 (BU/RD). Circuits GD114 (BK/BU) and GD116 (BK/VT) provides ground.
This pinpoint test is intended to diagnose the following:
- Fuse
- Wiring, terminals or connectors
- RFA module
PINPOINT TEST T: THE RFA MODULE DOES NOT RESPOND TO THE SCAN TOOL
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
-------------------------------------------------
T1 CHECK THE RFA MODULE VOLTAGE SUPPLY CIRCUIT FOR AN OPEN
- Ignition OFF.
- Disconnect: RFA Module C2153c (Blue Hardshell).
- Ignition ON.
- Measure the voltage between the RFA module C2153c-1, circuit SBP27 (BU/RD), harness side and ground; and between the RFA module C2153c-2, circuit SBP12 (GN/RD), harness side and ground.
- Is the voltage greater than 10 volts?
Yes
GO to T2.
No
VERIFY the Smart Junction Box (SJB) fuse 12 (7.5A) or 27 (20A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the Wiring Diagrams to identify the possible causes of the short circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
-------------------------------------------------
T2 CHECK THE RFA MODULE GROUND CIRCUIT FOR AN OPEN
- Measure the resistance between the RFA module C2153c-4, circuit GD116 (BK/VT), harness side and ground; and between the RFA module C2153c-5, circuit GD114 (BK/BU), harness side and ground.
- Is the resistance less than 5 ohms?
Yes
GO to T3.
No
REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
-------------------------------------------------
T3 CHECK THE MS-CAN CIRCUITS BETWEEN THE RFA MODULE AND THE DLC FOR AN OPEN
- Disconnect: RFA Module C2153d (Natural Hardshell).
- Measure the resistance between the RFA module C2153d-12, circuit VDB06 (GY/OG), harness side and the DLC C251-3, circuit VDB06 (GY/OG), harness side.
- Measure the resistance between the RFA module C2153d-13, circuit VDB07 (VT/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side.
- Are the resistances less than 5 ohms?
Yes
GO to T4.
No
REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
-------------------------------------------------
T4 CHECK THE HS-CAN CIRCUITS BETWEEN THE RFA MODULE AND THE DLC FOR AN OPEN
- Measure the resistance between the RFA module C2153d-21, circuit VDB04 (WH/BU), harness side and the DLC C251-6, circuit VDB04 (WH/BU), harness side.
- Measure the resistance between the RFA module C2153d-22, circuit VDB05 (WH), harness side and the DLC C251-14, circuit VDB05 (WH), harness side.
- Are the resistances less than 5 ohms?
Yes
GO to T5.
No
REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
-------------------------------------------------
T5 CHECK FOR CORRECT RFA MODULE OPERATION
- Disconnect all the RFA module connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the RFA module connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
Yes
INSTALL a new RFA module. CLEAR the DTCs. REPEAT the network test with the scan tool.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the network test with the scan tool.
-------------------------------------------------