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Pinpoint Test AP: DTC B272D

WARNING: This page is about a different car, the 2010 Mercury Milan, 2010 Lincoln MKZ, and 2010 Ford Fusion. 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 switch is ON.
NOTE: The Supplemental Restraint System (SRS) must be fully operational and free of faults before releasing the vehicle to the customer.
  1. AP1 CHECK THE DCSM FOR DTCs 
    • Enter the following diagnostic mode on the scan tool: Self Test - DCSM  .
    • Was DTC B272A or B272B retrieved? 
  1. AP2 MONITOR THE TED TEMPERATURE PIDs 
    • Enter the following diagnostic mode on the scan tool: DataLogger - DCSM  - PIDs.
      • Passenger cushion thermal electric device (TED) temperature (PCSHTMP)
      • Passenger back TED temperature (PBKTMP)
      • Seat cushion thermal electric device temperature (CSHTEMP)
      • Seat back thermal electric device temperature (BK_TEMP)
        NOTE: Make sure the temperature of the climate controlled seats has stabilized before monitoring the PIDs. Not allowing stabilization can cause incorrect readings and lead to incorrect identification of components that are not faulty.
    • Monitor the TED temperature PIDs with the climate controlled seats OFF. Compare the PIDs of the front passenger seat to those of the driver seat, this can help identify if there is a concern with the front passenger seat cushion or backrest PID readings.
    • Are both front passenger seat TED temperature PIDs within 10°C (18°F) of the ambient temperature? 
  1. AP3 CONFIRM THE FAULT IS IN THE SEAT CUSHION OR BACKREST TED 
    • Ignition OFF.
    • Ignition ON.
      NOTE: A crushed seat cushion foam pad or a crushed climate controlled seat manifold may be the cause of the fault. It may be necessary to sit on the seat or place something of reasonable size and weight on the seat to recreate the fault.
      NOTE: If the seat shuts down before a 15-minute heat cycle has timed-out, carry out the DCSM  self-test and go to the DUAL CLIMATE CONTROLLED SEAT MODULE (DCSM) DTC TABLE  to continue diagnostics.
    • After cycling the ignition and with the engine running, set the driver seat to high heat (3 indicators illuminated on HVAC module). Allow the seat to heat for at least 15 minutes while monitoring the TED temperature PIDs of the driver seat. If necessary, when the seat times-out after 15 minutes, set the driver seat to high heat once again.
    • Do the driver seat cushion TED and backrest TED PIDs vary more than 60°C (108°F) from each other? 
  1. AP4 CHECK THE TEDs COOLING PERFORMANCE 
  1. AP5 CHECK FOR CORRECT TED INSTALLATION AND FOR CRUSHED FOAM 
    • Ignition OFF.
    • Remove the seat. Refer to SEAT - FRONT .
    • Remove the seat cushion trim cover. Refer to SEAT CUSHION COVER - FRONT .
    • Inspect the seat cushion for the following:
      • Is the cushion blower obstructed?
      • Is the blower filter restricted or plugged?
      • Is the TED correctly installed?
      • Is the seat cushion foam pad crushed or restricted?
      • Is the climate controlled seat manifold crushed or restricted?
    • Is the TED correctly installed and the foam pad and manifold OK? 
  1. AP6 CHECK THE BACKREST TED GROUND CIRCUIT FOR A SHORT TO VOLTAGE 
    • Ignition OFF.
    • Position the front passenger seat in the vehicle and connect the seat-to-floor connectors.
    • Depower the SRS  . Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
    • Disconnect: Passenger Seat Side Air Bag C313.
    • Disconnect: DCSM  C3305a.
      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  C3305a-D, circuit RHS06 (WH), harness side and ground.
      Fig 1: Measuring Voltage Between DCSM C3305A-D, Circuit RHS06 (WH), Harness Side And Ground
      G06259409Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
  1. AP7 CHECK THE BACKREST TED FEED CIRCUIT FOR A SHORT TO GROUND 
    • Ignition OFF.
    • Measure the resistance between DCSM  C3305a-C, circuit CHS06 (BU/BN), harness side and ground.
      Fig 2: Measuring Resistance Between DCSM C3305A-C, Circuit CHS06 (BU/BN), Harness Side And Ground
      G06259410Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
  1. AP8 CHECK THE RESISTANCE OF THE BACKREST TED AND WIRING 
    • Measure the resistance between DCSM  C3305a-C, circuit CHS06 (BU/BN), harness side and DCSM  C3305a-D, circuit RHS06 (WH), harness side.
      Fig 3: Checking Resistance Of Backrest TED And Wiring
      G06259411Courtesy of FORD MOTOR CO.
    • Is the resistance between 0.9 and 10 ohms? 
  1. AP9 CHECK THE RESISTANCE OF THE BACKREST TED 
    • Disconnect: Backrest TED C3311.
    • Measure the resistance between backrest TED C3311 pin 1 and pin 3, component side.
      Fig 4: Measuring Resistance Between Backrest TED C3311 Pin 1 And Pin 3, Component Side
      G06259412Courtesy of FORD MOTOR CO.
    • Is the resistance between 0.9 and 10 ohms? 
  1. AP10 CHECK THE BLOWER MOTOR FEED AND SPEED CONTROL CIRCUITS FOR A SHORT TO VOLTAGE 
    • Disconnect: DCSM  C3305c.
    • Ignition ON.
    • Measure the voltage between:
      • DCSM  C3305c-8, circuit CHS08 (BN/YE), harness side and ground.
      • DCSM  C3305c-3, circuit VHS23 (BN/BU), harness side and ground.
      Fig 5: Checking Blower Motor Feed And Speed Control Circuits For Short To Voltage
      G06259413Courtesy of FORD MOTOR CO.
    • Is voltage present on either circuit? 
  1. AP11 CHECK THE BLOWER MOTOR FEED AND SPEED CONTROL CIRCUITS FOR A SHORT TO GROUND 
    • Ignition OFF.
    • Measure the resistance between:
      • DCSM  C3305c-8, circuit CHS08 (BN/YE), harness side and ground.
      • DCSM  C3305c-3, circuit VHS23 (BN/BU), harness side and ground.
      Fig 6: Checking Blower Motor Feed And Speed Control Circuits For Short To Ground
      G06259414Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10,000 ohms? 
  1. AP12 CHECK THE BLOWER MOTOR AND WIRING RESISTANCE 
    NOTE: The ohmmeter must be connected with the positive lead to DCSM  C3305c-8, circuit CHS08 (BN/YE) and the negative lead to DCSM  C3305c-7, circuit RHS08 (VT/WH) 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 DCSM  C3305c-8, circuit CHS08 (BN/YE), harness side and DCSM  C3305c-7, circuit RHS08 (VT/WH), harness side.
      Fig 7: Checking Blower Motor And Wiring Resistance
      G06259415Courtesy of FORD MOTOR CO.
    • Is the resistance between 4,000 and 10,000 ohms? 
  1. AP13 CHECK THE BLOWER MOTOR RESISTANCE 
    • Disconnect: Cushion TED C3303.
      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 C3303 pin 2 and pin 4, component side.
      Fig 8: Measuring Resistance Between Cushion TED C3303 Pin 2 And Pin 4, Component Side
      G06259416Courtesy of FORD MOTOR CO.
    • Is the resistance between 4,000 and 10,000 ohms? 
  1. AP14 CHECK THE BLOWER MOTOR SPEED CONTROL AND CIRCUIT RESISTANCE 
    • NOTE: The ohmmeter must be connected with the positive lead to C3305c-3, circuit VHS23 (BN/BU), harness side and the negative lead to C3305c-7, circuit RHS08 (VT/WH), harness side 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 DCSM  C3305c-3, circuit VHS23 (BN/BU), harness side and DCSM  C3305c-7, circuit RHS08 (VT/WH), harness side.
      Fig 9: Checking Blower Motor Speed Control And Circuit Resistance
      G06259417Courtesy of FORD MOTOR CO.
    • Is the resistance between 240 kohms and 4 megohms? 
  1. AP15 CHECK THE BLOWER MOTOR SPEED CONTROL RESISTANCE 
    • Disconnect: Cushion TED C3303.
      NOTE: The ohmmeter must be connected with the positive lead to pin 7 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 C3303 pin 7 and pin 4, component side.
      Fig 10: Measuring Resistance Between Cushion TED C3303 Pin 7 And Pin 4, Component Side
      G06259418Courtesy of FORD MOTOR CO.
    • Is the resistance between 240 kohms and 4 megohms? 
  1. AP16 CHECK THE THERMISTOR FEED CIRCUIT 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 C313.
    • Disconnect: DCSM  C3305b.
      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  C3305b-2, circuit VHS27 (WH/OG), harness side and ground.
      Fig 11: Measuring Voltage Between DCSM C3305B-2, Circuit VHS27 (WH/OG), Harness Side And Ground
      G06259419Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
  1. AP17 CHECK THE THERMISTOR FEED CIRCUIT FOR A SHORT TO GROUND 
    • Ignition OFF.
    • Measure the resistance between DCSM  C3305b-2, circuit VHS27 (WH/OG), harness side and ground.
      Fig 12: Measuring Resistance Between DCSM C3305B-2, Circuit VHS27 (WH/OG), Harness Side And Ground
      G06259420Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
  1. AP18 CHECK THE THERMISTOR AND WIRING RESISTANCE 
    • Measure the resistance between DCSM  C3305b-2, circuit VHS27 (WH/OG), harness side and DCSM  C3305b-3, circuit RHS10 (BU/OG), harness side. Note the ambient temperature and compare result to the following table:
      TEMPERATURE RESISTANCE REFERENCE TABLE

      Temperature Resistance
      0-10°C (32-50°F) 2,782-1,663 ohms
      10-20°C (50-68°F) 1,837-1,140 ohms
      20-30°C (68-86°F) 1,260-806 ohms
      30-40°C (86-104°F) 893-570 ohms
      40-50°C (104-122°F) 630-428 ohms
      Fig 13: Checking Thermistor And Wiring Resistance
      G06259421Courtesy of FORD MOTOR CO.
    • Is the resistance within the limits indicated? 
  1. AP19 CHECK THE THERMISTOR RESISTANCE 
    • Disconnect: Cushion TED C3303.
    • Measure the resistance between cushion TED pin 5 and pin 8, component side. Note the ambient temperature and compare result to the following table:
      TEMPERATURE RESISTANCE REFERENCE TABLE

      Temperature Resistance
      0-10°C (32-50°F) 2,782-1,663 ohms
      10-20°C (50-68°F) 1,837-1,140 ohms
      20-30°C (68-86°F) 1,260-806 ohms
      30-40°C (86-104°F) 893-570 ohms
      40-50°C (104-122°F) 630-428 ohms
      Fig 14: Measuring Resistance Between Cushion TED Pin 5 And Pin 8, Component Side
      G06259422Courtesy of FORD MOTOR CO.
    • Is the resistance within the limits indicated? 
  1. AP20 CHECK FOR CORRECT TED INSTALLATION AND FOR CRUSHED FOAM 
    • Ignition OFF.
    • Remove the seat. Refer to SEAT - FRONT .
    • Remove the seat backrest trim cover. Refer to SEAT BACKREST COVER - FRONT, WITHOUT FOLD FLAT .
    • Inspect the seat backrest for the following:
      • Is the backrest blower obstructed?
      • Is the blower filter restricted or plugged?
      • Is the TED correctly installed?
      • Is the seat backrest foam pad crushed or restricted?
      • Is the climate controlled seat manifold crushed or restricted?
    • Is the TED correctly installed and the foam pad and manifold OK? 
  1. AP21 CHECK THE CUSHION TED GROUND CIRCUIT FOR A SHORT TO VOLTAGE 
    • Ignition OFF.
    • Position the front passenger seat in the vehicle and connect the seat-to-floor connectors.
    • Depower the SRS  . Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
    • Disconnect: Passenger Seat Side Air Bag C313.
    • Disconnect: DCSM  C3305a.
      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  C3305a-B, circuit RHS07 (BU), harness side and ground.
      Fig 15: Measuring Voltage Between DCSM C3305A-B, Circuit RHS07 (BU), Harness Side And Ground
      G06259423Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
  1. AP22 CHECK THE CUSHION TED FEED CIRCUIT FOR A SHORT TO GROUND 
    • Ignition OFF.
    • Measure the resistance between DCSM  C3305a-A, circuit CHS07 (GY/BU), harness side and ground.
      Fig 16: Measuring Resistance Between DCSM C3305A-A, Circuit CHS07 (GY/BU), Harness Side And Ground
      G06259424Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
  1. AP23 CHECK THE CUSHION TED AND WIRING RESISTANCE 
    • Measure the resistance between DCSM  C3305a-A circuit CHS07 (GY/BU), harness side and DCSM  C3305a-B, circuit RHS07 (BU), harness side.
      Fig 17: Checking Cushion TED And Wiring Resistance
      G06259425Courtesy of FORD MOTOR CO.
    • Is the resistance between 0.9 and 10 ohms? 
  1. AP24 CHECK THE CUSHION TED RESISTANCE 
    • Disconnect: Cushion TED C3303.
    • Measure the resistance between cushion TED C3303 pin 1 and pin 3, component side.
      Fig 18: Measuring Resistance Between Cushion TED C3303 Pin 1 And Pin 3, Component Side
      G06259426Courtesy of FORD MOTOR CO.
    • Is the resistance between 0.9 and 10 ohms? 
  1. AP25 CHECK THE BLOWER MOTOR FEED AND SPEED CONTROL CIRCUITS FOR A SHORT TO VOLTAGE 
    • Disconnect: DCSM  C3305c.
    • Ignition ON.
    • Measure the voltage between:
      • DCSM  C3305c-8, circuit CHS08 (BN/YE), harness side and ground.
      • DCSM  C3305c-4, circuit VHS21 (BU/WH), harness side and ground.
      Fig 19: Checking Blower Motor Feed And Speed Control Circuits For Short To Voltage
      G06259427Courtesy of FORD MOTOR CO.
    • Is voltage present on either circuit? 
  1. AP26 CHECK THE BLOWER MOTOR FEED AND SPEED CONTROL CIRCUITS FOR A SHORT TO GROUND 
    • Ignition OFF.
    • Measure the resistance between:
      • DCSM  C3305c-8, circuit CHS08 (BN/YE), harness side and ground.
      • DCSM  C3305c-4, circuit VHS21 (BU/WH), harness side and ground.
      Fig 20: Checking Blower Motor Feed And Speed Control Circuits For Short To Ground
      G06259428Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10,000 ohms? 
  1. AP27 CHECK THE BLOWER MOTOR AND WIRING RESISTANCE 
    NOTE: The ohmmeter must be connected with the positive lead to DCSM  C3305c-8, circuit CHS08 (BN/YE) and the negative lead to DCSM  C3305c-7, circuit RHS08 (VT/WH) 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 DCSM  C3305c-8, circuit CHS08 (BN/YE), harness side and DCSM  C3305c-7, circuit RHS08 (VT/WH), harness side.
      Fig 21: Checking Blower Motor And Wiring Resistance
      G06259429Courtesy of FORD MOTOR CO.
    • Is the resistance between 4,000 and 10,000 ohms? 
  1. AP28 CHECK THE BLOWER MOTOR RESISTANCE 
    • Disconnect: Backrest TED C3311.
      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 backrest TED C3311 pin 2 and pin 4, component side.
      Fig 22: Measuring Resistance Between Backrest TED C3311 Pin 2 And Pin 4, Component Side
      G06259430Courtesy of FORD MOTOR CO.
    • Is the resistance between 4,000 and 10,000 ohms? 
  1. AP29 CHECK THE BLOWER MOTOR GROUND CIRCUIT TO BLOWER MOTOR SPEED CONTROL CIRCUIT RESISTANCE 
    NOTE: The ohmmeter must be connected with the positive lead to C3305c-4, circuit VHS21 (BU/WH), harness side and the negative lead to C3305c-7, circuit RHS08 (VT/WH), harness side 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 DCSM  C3305c-4, circuit VHS21 (BU/WH), harness side and DCSM  C3305c-7, circuit RHS08 (VT/WH), harness side.
      Fig 23: Checking Blower Motor Ground Circuit To Blower Motor Speed Control Circuit Resistance
      G06259431Courtesy of FORD MOTOR CO.
    • Is the resistance between 240 kohms and 4 megohms? 
  1. AP30 CHECK THE BLOWER MOTOR SPEED CONTROL RESISTANCE 
    • Disconnect: Backrest TED C3311.
      NOTE: The ohmmeter must be connected with the positive lead to pin 7 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 backrest TED C3311 pin 7 and pin 4, component side.
      Fig 24: Measuring Resistance Between Backrest TED C3311 Pin 7 And Pin 4, Component Side
      G06259432Courtesy of FORD MOTOR CO.
    • Is the resistance between 240 kohms and 4 megohms? 
  1. AP31 CHECK THE THERMISTOR FEED CIRCUIT FOR A SHORT TO VOLTAGE 
    • Disconnect: DCSM  C3305b.
    • Ignition ON.
    • Measure the voltage between DCSM  C3305b-4, circuit VHS36 (YE/BU), harness side and ground.
      Fig 25: Measuring Voltage Between DCSM C3305B-4, Circuit VHS36 (YE/BU), Harness Side And Ground
      G06259433Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
  1. AP32 CHECK THE THERMISTOR FEED CIRCUIT FOR A SHORT TO GROUND 
    • Ignition OFF.
    • Depower the SRS  . Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
    • Disconnect: Passenger Seat Side Air Bag Module C313.
    • Measure the resistance between DCSM  C3305b-4, circuit VHS36 (YE/BU), harness side and ground.
      Fig 26: Measuring Resistance Between DCSM C3305B-4, Circuit VHS36 (YE/BU), Harness Side And Ground
      G06259434Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
  1. AP33 CHECK THE THERMISTOR AND WIRING RESISTANCE AT THE DCSM 
    • Measure the resistance between DCSM  C3305b-4, circuit VHS36 (YE/BU), harness side and DCSM  C3305b-5, circuit RHS20 (GN/BU), harness side. Note the ambient temperature and compare result to the following table:
      TEMPERATURE RESISTANCE REFERENCE TABLE

      Temperature Resistance
      0-10°C (32-50°F) 2,782-1,663 ohms
      10-20°C (50-68°F) 1,837-1,140 ohms
      20-30°C (68-86°F) 1,260-806 ohms
      30-40°C (86-104°F) 893-570 ohms
      40-50°C (104-122°F) 630-428 ohms
      Fig 27: Checking Thermistor And Wiring Resistance DCSM
      G06259435Courtesy of FORD MOTOR CO.
    • Is the resistance within the limits indicated? 
  1. AP34 CHECK THE TED THERMISTOR RESISTANCE 
    • Disconnect: Backrest TED C3311.
    • Measure the resistance between backrest TED pin 5 and pin 8, component side. Note the ambient temperature and compare result to the following table:
      TEMPERATURE RESISTANCE REFERENCE TABLE

      Temperature Resistance
      0-10°C (32-50°F) 2,782-1,663 ohms
      10-20°C (50-68°F) 1,837-1,140 ohms
      20-30°C (68-86°F) 1,260-806 ohms
      30-40°C (86-104°F) 893-570 ohms
      40-50°C (104-122°F) 630-428 ohms
      Fig 28: Measuring Resistance Between Backrest TED Pin 5 And Pin 8, Component Side
      G06259436Courtesy of FORD MOTOR CO.
    • Is the resistance within the limits indicated? 
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