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Pinpoint Test Aw: DTC B272F

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: When taking measurements at Dual Climate Controlled Seat Module (DCSM) harness connectors, do not insert the electrical probes into the female connector pins. Inserting the probes into connector pins can cause intermittent or open electrical connections after reassembly resulting in Diagnostic Trouble Codes (DTCs) and system failure. Touching the tip of these connector pins is recommended instead.
NOTE: The air bag warning indicator illuminates when the correct Restraints Control Module (RCM) fuse is removed and the ignition is ON.
NOTE: The Supplemental Restraint System (SRS) must be fully operational and free of faults before releasing the vehicle to the customer.
  1. AW1 CHECK DCSM PASSENGER TED HEAT MODE (TED_HEAT_P) PID 
    • Access the cushion and backrest TEDs  and remove the filters to watch the TED  fans.
    • Connect the scan tool.
    • Enter the following diagnostic mode on the scan tool: DataLogger - DCSM  PID TED_HEAT_P.
      • NOTE: The DCSM  active command TED_HEAT_P is limited to 15 seconds in the ON state.
    • Operate the climate controlled seat using the active command while monitoring the cushion and backrest TEDs  for fan movement.
    • Did both fans turn on? 
  2. AW2 CHECK FOR AN INTERMITTENT CONNECTION AT THE DCSM 
    • Ignition OFF.
    • Disconnect: DCSM  C3036c.
    • Connect: DCSM  C3036c.
    • With the engine running and using the switches on the HVAC module, turn the passenger climate controlled seat system on while monitoring the cushion and backrest fans for movement.
      • If there is fan movement, run the passenger climate controlled seat system for 2 minutes.
    • Did the climate controlled seat operate correctly? 
    • Yes:  The fault is intermittent. CHECK for causes of the intermittent fault at C3036c and REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.
    • No:  GO to AW3  .
  3. AW3 CHECK FOR AN INTERMITTENT CONNECTION AT THE CUSHION TED 
    • Ignition OFF.
    • Disconnect: Cushion TED  C3328.
    • Connect: Cushion TED  C3328.
    • With the engine running and using the switches on the HVAC module, turn the passenger climate controlled seat system on while monitoring the cushion and backrest fans for movement.
      • If there is fan movement, run the passenger climate controlled seat system for 2 minutes.
    • Did the climate controlled seat operate correctly? 
    • Yes:  The fault is intermittent. CHECK for causes of the intermittent fault at C3328 and REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.
    • No:  GO to AW4  .
  4. AW4 CHECK FOR AN INTERMITTENT CONNECTION AT THE BACKREST TED 
    • Ignition OFF.
    • Disconnect: Backrest TED  C3326.
    • Connect: Backrest TED  C3326.
    • With the engine running and using the switches on the HVAC module, turn the passenger climate controlled seat system on while monitoring the cushion and backrest fans for movement.
      • If there is fan movement, run the passenger climate controlled seat system for 2 minutes.
    • Did the climate controlled seat operate correctly? 
    • Yes:  The fault is intermittent. CHECK for causes of the intermittent fault at C3326 and REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.
    • No:  GO to AW5  .
  5. AW5 CHECK BLOWER CIRCUIT CHS08 (BN/YE) FOR A SHORT TO VOLTAGE 
    • Ignition OFF.
    • Depower the SRS  . Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
    • Disconnect: Passenger Seat Side Air Bag C327.
    • Disconnect: DCSM  C3036c.
    • Disconnect: Cushion TED  C3328.
    • Disconnect: Backrest TED  C3326.
      • WARNING: Make sure no one is in the vehicle and there is nothing blocking or placed in front of any air bag module when the battery is connected. Failure to follow these instructions may result in serious personal injury in the event of an accidental deployment.
    • Connect the battery ground cable. Refer to BATTERY, MOUNTING AND CABLES .
    • Ignition ON.
    • Measure the voltage between DCSM  C3036c-8, circuit CHS08 (BN/YE), harness side and ground.
      Fig 1: Measuring Voltage Between DCSM C3036c-8, Circuit CHS08 (BN/YE), Harness Side And Ground
      G06077028Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
  6. AW6 CHECK CUSHION TED BLOWER CIRCUITS CHS08 (BN/YE) AND RHS08 (VT/WH) FOR AN OPEN 
    • Measure the resistance between:
      • DCSM  C3036c-8, circuit CHS08 (BN/YE), harness side and cushion TED  C3328-2, circuit CHS08 (BN/YE), harness side.
      • DCSM  C3036c-7, circuit RHS08 (VT/WH), harness side and cushion TED  C3328-4, circuit RHS08 (VT/WH), harness side.
        Fig 2: Measuring Resistance Between DCSM C3036c-8, Circuit CHS08 (BN/YE) And Cushion TED C3328-2, Circuit CHS08 (BN/YE)
        G06077029Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
  7. AW7 CHECK BACKREST TED BLOWER CIRCUITS CHS08 (BN/YE) AND RHS08 (VT/WH) FOR AN OPEN 
    • Measure the resistance between:
      • DCSM  C3036c-8, circuit CHS08 (BN/YE), harness side and backrest TED  C3326-2, circuit CHS08 (BN/YE), harness side.
      • DCSM  C3036c-7, circuit RHS08 (VT/WH), harness side and backrest TED  C3326-4, circuit RHS08 (VT/WH), harness side.
        Fig 3: Measuring Resistance Between DCSM C3036c-8, Circuit CHS08 (BN/YE) And Cushion TED C3328-2, Circuit CHS08 (BN/YE)
        G06077029Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
  8. AW8 CHECK THE BLOWER RESISTANCE 
      NOTE: The ohmmeter must be connected with the positive lead to pin 2 and the negative lead to pin 4 when measuring. Ohmmeter leads incorrectly connected will result in false readings and lead to incorrect identification of components that are not faulty.
    • Measure the resistance between cushion TED  C3328 pin 2 and pin 4, component side and between backrest TED  C3326 pin 2 and pin 4, component side.
      Fig 4: Measuring Resistance Between Cushion TED C3327 Pin 2 And Pin 4, Component Side
      G06077017Courtesy of FORD MOTOR CO.
    • Are the resistances between 4,000 ohms and 10,000 ohms? 
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