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Home >> Ford >> 2009 >> Flex Limited, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1093 (Body Panel System - Body Closures) >> Diagnostic Tests >> Power Liftgate >> Pinpoint Tests >> Pinpoint Test I: Liftgate/Trunk Module (LTM) DTC B117C - Latch Centering Switch Invalid >> Pinpoint Test I: Liftgate/Trunk Module (LTM) DTC B117C - Latch Centering Switch Invalid

Pinpoint Test I: Liftgate/Trunk Module (LTM) DTC B117C - Latch Centering Switch Invalid

WARNING: This page is about a different car, the 2007 Lincoln MKX and 2007 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.
  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
    • Key in ON position.
      • Fig 1: Measuring Voltage Between Power Liftgate Latch/Unlatch Assembly C4188-6, Circuit CPR67 (VT)
      GF0030630Courtesy of FORD MOTOR CO.
    • 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.
    • Is the voltage greater than 10 volts for both measurements? 
    1. YES  : Go to  I4.
    2. NO  : Go to  I2.
  2. I2 CHECK CIRCUITS CPR67 (VT) AND CPR68 (YE) FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: LTM C4174B
      • Fig 2: Measuring Resistance Between LTM C4174B-15, Circuit CPR67 (VT), Harness Side & Ground
      GF0021172Courtesy of FORD MOTOR CO.
    • 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.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  I3.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  3. I3 CHECK CIRCUITS CPR67 (VT) AND CPR68 (YE) FOR AN OPEN 
      Fig 3: Measuring Resistance Between LTM C4174B-15, Circuit CPR67 (VT) & Power Liftgate Latch/Unlatch Assembly C4188-6
      GF0030631Courtesy of FORD MOTOR CO.
    • Measure the resistance between LTM C4174B-15, circuit CPR67 (VT), harness side and power liftgate latch/unlatch assembly C4188-6, circuit CPR67 (VT), harness side; and between LTM C4174B-26, circuit CPR68 (YE), harness side and power liftgate latch/unlatch assembly C4188-7, circuit CPR68 (YE), harness side.
    • Is the resistance less than 5 ohms for both measurements? 
    1. 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) . TEST the system for normal operation.

    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  4. I4 CHECK CIRCUITS CPR67 (VT) AND CPR68 (YE) FOR A SHORT TO VOLTAGE 
    • Key in OFF position.
    • Disconnect: LTM C4174B
    • Key in ON position.
      • Fig 4: Measuring Voltage Between Power Liftgate Latch/Unlatch Assembly C4188-6, Circuit CPR67 (VT)
      GF0030630Courtesy of FORD MOTOR CO.
    • 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.
    • Is voltage present for both measurements? 
    1. YES  : REPAIR the circuit. TEST the system for normal operation.
    2. 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 . TEST the system for normal operation.

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