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Pinpoint Test Ab: The RHVAC Module Does Not Respond To The Scan Tool

WARNING: This page is about a different car, the 2011 Lincoln MKT. 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. AB1 CHECK THE RHVAC MODULE VOLTAGE SUPPLY CIRCUIT FOR AN OPEN 
    • Ignition OFF.
    • Disconnect: Rear Heating Ventilation Air Conditioning (RHVAC) Module C3198.
    • Ignition ON.
    • Measure the voltage between the RHVAC module C3198-6, circuit SBP16 (VT/RD), harness side and ground.
      Fig 1: Measuring Voltage Between RHVAC Module C3198-6, Circuit SBP16 (VT/RD), Harness Side And Ground
      G06284115Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. Yes  : GO to AB2.
    2. No  : VERIFY the Smart Junction Box (SJB) fuse 16 (15A) is OK. If OK, REPAIR the circuit in question. If not OK, REFER to the SYSTEM WIRING DIAGRAMS article to identify the possible causes of the circuit short. CLEAR the DTCs. REPEAT the network test with the scan tool.
  2. AB2 CHECK THE RHVAC MODULE GROUND CIRCUIT FOR AN OPEN 
    • Ignition OFF.
    • Measure the resistance between the RHVAC module C3198-5, circuit GD114 (BK/BU), harness side and ground.
      Fig 2: Measuring Resistance Between RHVAC Module C3198-5, Circuit GD114 (BK/BU), Harness Side And Ground
      G06284116Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes  : GO to AB3.
    2. No  : REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
  3. AB3 CHECK THE MS-CAN CIRCUITS BETWEEN THE RHVAC MODULE AND THE DLC FOR AN OPEN 
    • Measure the resistance between the RHVAC module C3198-1, circuit VDB06 (GY/OG), harness side and the DLC C251-3, circuit VDB06 (GY/OG), harness side.
      Fig 3: Measuring Resistance Between RHVAC Module C3198-1 And DLC C251-3, Circuit VDB06 (GY/OG), Harness Side
      G06284117Courtesy of FORD MOTOR CO.
    • Measure the resistance between the RHVAC module C3198-2, circuit VDB07 (VT/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side.
      Fig 4: Measuring Resistance Between RHVAC Module C3198-2 And DLC C251-11, Circuit VDB07 (VT/OG), Harness Side
      G06284118Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
    1. Yes  : GO to AB4.
    2. No  : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
  4. AB4 CHECK FOR CORRECT RHVAC MODULE OPERATION 
    • Disconnect the RHVAC module connector.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect the RHVAC module connector and make sure it seats correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    1. Yes  : INSTALL a new RHVAC module. REFER to HVAC - AUXILLARY CLIMATE CONTROL 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.
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