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Pinpoint Test I: The Rear Audio And Temperature Control (RATC) Module Does Not Respond To The Scan Tool

WARNING: This page is about a different car, the 2010 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
  1. I1 CHECK THE RATC MODULE VOLTAGE SUPPLY CIRCUIT FOR AN OPEN 
    • Key in OFF position.
    • Disconnect the scan tool cable from the data link connector (DLC).
    • Disconnect: RATC Module C3160b
    • Key in ON position.
    • Measure the voltage between the RATC module C3160b-2, circuit 1499 (PK/LG), harness side and ground.
      • Fig 1: Checking Circuit For Open
      GF0019126Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  I2.
    2. NO  : VERIFY the central junction box (CJB) F32 (7.5A) is OK. If OK, REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
  2. I2 CHECK THE RATC MODULE GROUND CIRCUIT FOR AN OPEN 
    • Key in OFF position.
    • Measure the resistance between the RATC module C3160a-3, circuit 676 (PK/OG), harness side and ground.
      • Fig 2: Checking Circuit For Open
      GF0019127Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  I3.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
  3. I3 CHECK THE SCP CIRCUITS BETWEEN THE DLC AND THE RATC MODULE FOR AN OPEN 
    • Disconnect: RATC Module C3160a
    • Measure the resistance between the RATC module C3160a-1, circuit 914 (TN/OG), harness side and the DLC C251-2, circuit 914 (TN/OG), harness side.
      • Fig 3: Checking Circuit For Open
      GF0019128Courtesy of FORD MOTOR CO.
    • Measure the resistance between the RATC module C3160a-2, circuit 915 (PK/LB), harness side and the DLC C251-10, circuit 915 (PK/LB), harness side.
      • Fig 4: Checking Circuit For Open
      GF0019129Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
    1. YES  : Go to  I4.
    2. NO  : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
  4. I4 CHECK FOR CORRECT RATC MODULE OPERATION 
    • Disconnect all the RATC module connectors.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect all the RATC module connectors and make sure they seat correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    1. YES  : INSTALL a new RATC module. REFER to MULTIFUNCTION ELECTRONIC MODULES article. CLEAR the DTCs. REPEAT the network test with the scan tool.
    2. 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.
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