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Pinpoint Test I: DTC B117C - Latch Centering Switch Invalid

WARNING: This page is about a different car, the 2010 Lincoln MKX and 2010 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Use the correct probe adapter(s) from the Flex Probe Kit when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
  1. I1 CHECK THE SECTOR GEAR SWITCH CIRCUITS 
    NOTE: If any other power liftgate related DTCs are present, diagnose those first before proceeding with this pinpoint test. Refer to the LIFTGATE/TRUNK MODULE (LTM) DTC CHART .
    • Disconnect: Latch/Unlatch Assembly C4188.
    • Ignition ON.
    • Measure the voltage between power liftgate latch/unlatch assembly C4188-6, circuit CPR67 (VT), harness side and ground; and between C4188-7, circuit CPR68 (YE), harness side and ground.
      Fig 1: Checking Sector Gear Switch Circuits
      G06284384Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts for both measurements? 
    • Yes:  GO to  I4.
    • No:  GO to I2  .
  2. I2 CHECK CIRCUITS CPR67 (VT) AND CPR68 (YE) FOR A SHORT TO GROUND 
    • Ignition OFF.
    • Disconnect: LTM  C4174B.
    • Measure the resistance between LTM  C4174B-15, circuit CPR67 (VT), harness side and ground; and between LTM  C4174B-26, circuit CPR68 (YE), harness side and ground.
      Fig 2: Checking Circuits CPR67 (VT) And CPR68 (YE) For Short To Ground
      G06070763Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    • Yes:  GO to I3  .
    • No:  REPAIR the circuit. CLEAR the DTCs. REPEAT the LTM  self-test.
  3. I3 CHECK CIRCUITS CPR67 (VT) AND CPR68 (YE) FOR AN OPEN 
    • Measure the resistance between LTM  C4174B, harness side and power liftgate latch/unlatch assembly C4188, harness side using the following chart:
      POWER LIFTGATE LATCH/UNLATCH ASSEMBLY REFERENCE CHART

      LTM  Circuit Power Liftgate Latch/Unlatch Assembly
      C4174B-15 CPR67 (VT) C4188-6
      C4174B-26 CPR68 (YE) C4188-7
      Fig 3: Measuring Resistance Between LTM C4174B And Power Liftgate Latch/Unlatch Assembly C4188, Harness Side
      G06505793Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms for both measurements? 
    • Yes:  CHECK the LTM  connector for bent or corroded connections on the component side and harness side. REPAIR as necessary.

      CLEAR the DTCs. REPEAT the LTM  self-test.

      IF DTC B117C returns, INSTALL a new LTM  . REFER to LIFTGATE/TRUNK MODULE (LTM) . CLEAR the DTCs. REPEAT the LTM  self-test.

    • No:  REPAIR the circuit. CLEAR the DTCs. REPEAT the LTM  self-test.
  4. I4 CHECK CIRCUITS CPR67 (VT) AND CPR68 (YE) FOR A SHORT TO VOLTAGE 
    • Ignition OFF.
    • Disconnect: LTM  C4174B.
    • Ignition ON.
    • Measure the voltage between power liftgate latch/unlatch assembly C4188-6, circuit CPR67 (VT), harness side and ground; and between C4188-7, circuit CPR68 (YE), harness side and ground.
      Fig 4: Checking Sector Gear Switch Circuits
      G06284384Courtesy of FORD MOTOR CO.
    • Is voltage present for both measurements? 
    • Yes:  REPAIR the circuit. CLEAR the DTCs. REPEAT the LTM  self-test.
    • No:  CHECK the power liftgate latch connector for bent or corroded connections on the component side and harness side. REPAIR as necessary.

      INSTALL a new power liftgate latch. REFER to HANDLES, LOCKS, LATCHES AND ENTRY SYSTEMS . CLEAR the DTCs. REPEAT the LTM  self-test.

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