LEMON Manuals: Even more car manuals for everyone
Home >> Ford >> 2009 >> Flex Limited, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1111 (Seat System) >> Diagnostic Tests >> Seats >> Pinpoint Tests >> Pinpoint Test AN: DTC B272A - Passenger Cushion Over-Temp Detected >> Pinpoint Test An: DTC B272A - Passenger Cushion Over-Temp Detected

Pinpoint Test An: DTC B272A - Passenger Cushion Over-Temp Detected

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.
NOTE: The air bag warning indicator illuminates when the restraints control module (RCM) fuse is removed and the ignition switch is ON. This is normal operation and does not indicate a supplemental restraint system (SRS) fault.
NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
  1. AN1 CHECK THE CCSM FOR DTCS 
    • Enter the following diagnostic mode on the diagnostic tool: Climate Controlled Seat Module (CCSM) Self Test/Retrieve DTCs
    • Was DTC B272A retrieved during the self-test? 
    1. YES  : Go to  AN2.
    2. NO  : Go to  AN4.
  2. AN2 CHECK THE TED THERMISTOR CIRCUITS FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of SUPPLEMENTAL RESTRAINT SYSTEM .
    • Disconnect: Passenger seat side air bag C327
    • Disconnect: Passenger seat safety belt buckle pretensioner C3202
    • Disconnect: CCSM C3036b
    • Disconnect: Cushion TED C3328
      • 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.
      • Fig 1: Measuring Resistance Between CCSM C3036B-2 & C3036B-3, Circuit VHS27 (WH/OG) & RHS10 (BU/OG)
      GF0021403Courtesy of FORD MOTOR CO.
    • Measure the resistance between CCSM C3036b-2, circuit VHS27 (WH/OG), harness side and ground and between CCSM C3036b-3, circuit RHS10 (BU/OG), harness side and ground.
    • Are the resistances greater than 10,000 ohms? 
    1. YES  : Go to  AN3.
    2. NO  : REPAIR the affected circuit. REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable.

      CONNECT passenger safety belt buckle pretensioner C3202. CONNECT passenger seat side air bag module C327.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  3. AN3 CHECK THE TED THERMISTOR 
      Fig 2: Measuring Resistance Between Cushion TED C3328 Pin 5 & Pin 8, Component Side
      GF0021408Courtesy of FORD MOTOR CO.
    • Measure the resistance between cushion TED C3328 pin 5 and pin 8, component side. Note the ambient temperature and refer to the following table.
      Temperature Resistance
      0-10°C (32-50°F) 2782-1663 ohms
      10-20°C (50-68°F) 1837-1140 ohms
      20-30°C (68-86°F) 1260-806 ohms
      30-40°C (86-104°F) 893-570 ohms
      40-50°C (104-122°F) 630-428 ohms
    • Is the resistance within the limits indicated? 
    1. YES  : REPAIR the affected open circuit. REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable.

      CONNECT passenger safety belt buckle pretensioner C3202. CONNECT passenger seat side air bag module C327.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

    2. NO  : INSTALL a new cushion TED. REFER to Seat Cushion Thermo-Electric Device . REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable.

      CONNECT passenger safety belt buckle pretensioner C3202. CONNECT passenger seat side air bag module C327.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  4. AN4 CONFIRM THE FAULT 
    • Verify with the customer that the concern is the seat shuts OFF in heat mode.
      • 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.
    • Attempt to recreate the fault. Start the vehicle and set the passenger seat to high heat for at least 15 minutes.
    • Is the customer concern with the seat shutting OFF in heat mode or was the fault recreated? 
    1. YES  : Go to  AN5.
    2. NO  : Fault not present. Fault may have been set due to a past failure or incorrect use of the climate controlled seat system by repeated switching between heat and cool modes. REPEAT the self-test. CLEAR the DTCs.
  5. AN5 CHECK OPERATION OF THE SEAT 
    • Key in ON position.
    • With the engine running, set both front seats to high cool (3 LEDs illuminated on EATC module).
    • Compare the airflow from the passenger seat cushion and compare it to the airflow from the driver seat cushion.
    • Is the airflow exhausting from the passenger seat cushion comparable to the airflow exhausting from the driver seat cushion? 
    1. YES  : Go to  AN14.
    2. NO  : Go to  AN6.
  6. AN6 CHECK THE CUSHION BLOWER FOR AN OBSTRUCTION OR RESTRICTED FILTER 
    • Key in OFF position.
    • Inspect the blower of the cushion TED assembly for an obstruction or for a restricted filter.
    • Is the blower obstructed or the filter restricted? 
    1. YES  : REMOVE the obstruction or INSTALL a new filter. REPEAT the self-test. CLEAR the DTCs.
    2. NO  : Go to  AN7.
  7. AN7 CHECK THE CUSHION FAN OPERATION 
    • Key in ON position.
    • With the engine running, set both front seats to high cool (3 LEDs illuminated on EATC module).
    • Inspect the cushion blower for operation.
    • Does the cushion blower operate? 
    1. YES  : Go to  AN14.
    2. NO  : Go to  AN8.
  8. AN8 CHECK THE BLOWER SPEED CONTROL CIRCUIT FOR AN OPEN 
    • Key in OFF position.
    • Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of SUPPLEMENTAL RESTRAINT SYSTEM .
    • Disconnect: Passenger seat safety belt buckle pretensioner C3202
    • Disconnect: Passenger seat side air bag C327
    • Disconnect: CCSM C3036c
    • Disconnect: Cushion TED C3328
      • 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.
      • Fig 3: Measuring Resistance Between CCSM C3036C-3, Circuit VHS23 (BN/BU) & Cushion TED C3328-7
      GF0030829Courtesy of FORD MOTOR CO.
    • Measure the resistance between CCSM C3036c-3, circuit VHS23 (BN/BU), harness side and cushion TED C3328-7, circuit VHS23 (BN/BU), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  AN9.
    2. NO  : REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable.

      CONNECT passenger safety belt buckle pretensioner C3202. CONNECT passenger seat side air bag module C327.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  9. AN9 CHECK THE BLOWER CIRCUIT RHS08 (VT/WH) FOR A SHORT TO VOLTAGE 
    • Key in ON position.
      • Fig 4: Measuring Voltage Between CCSM C3036C-7, Circuit RHS08 (VT/WH) & Ground
      GF0021405Courtesy of FORD MOTOR CO.
    • Measure the voltage between CCSM C3036c-7, circuit RHS08 (VT/WH), harness side and ground.
    • Is voltage greater than 1 volt? 
    1. YES  : REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable.

      CONNECT passenger safety belt buckle pretensioner C3202. CONNECT passenger seat side air bag module C327.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

    2. NO  : Go to  AN10.
  10. AN10 CHECK THE BLOWER CIRCUIT CHS08 (BN/YE) FOR A SHORT TO GROUND 
    • Key in OFF position.
      • Fig 5: Measuring Resistance Between CCSM C3036C-8, Circuit CHS08 (BN/YE) & Ground
      GF0021394Courtesy of FORD MOTOR CO.
    • Measure the resistance between CCSM C3036c-8, circuit CHS08 (BN/YE), harness side and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  AN11.
    2. NO  : REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable.

      CONNECT passenger safety belt buckle pretensioner C3202. CONNECT passenger seat side air bag module C327.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  11. AN11 CHECK THE BLOWER CIRCUITS CHS08 (BN/YE) AND RHS08 (VT/WH) FOR AN OPEN 
      Fig 6: Measuring Resistance Between CCSM C3036C-8 & , Circuit CHS08 (BN/YE) & Cushion TED C3328-2
      GF0021410Courtesy of FORD MOTOR CO.
    • Measure the resistance between CCSM C3036c-8, circuit CHS08 (BN/YE), harness side and cushion TED C3328-2, circuit CHS08 (BN/YE), harness side; and between CCSM C3036c-7, circuit RHS08 (VT/WH), harness side and cushion TED C3328-4, circuit RHS08 (VT/WH), harness side.
    • Are the resistances less than 5 ohms? 
    1. YES  : Go to  AN12.
    2. NO  : REPAIR the affected circuit. REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable.

      CONNECT passenger safety belt buckle pretensioner C3202. CONNECT passenger seat side air bag module C327.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  12. AN12 CHECK THE BLOWER RESISTANCE 
      Fig 7: Measuring Resistance Between Cushion TED C3328 Pin 2 & Pin 4, Component Side
      GF0021411Courtesy of FORD MOTOR CO.
      CAUTION: 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.
    • Is the resistance between 6,000 ohms and 9,000 ohms? 
    1. YES  : Go to  AN13.
    2. NO  : INSTALL a new cushion TED. REFER to Seat Cushion Thermo-Electric Device . REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable.

      CONNECT passenger safety belt buckle pretensioner C3202. CONNECT passenger seat side air bag module C327.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  13. AN13 CHECK THE BLOWER SPEED CONTROL RESISTANCE 
      Fig 8: Measuring Resistance Between Cushion TED C3328 Pin 7 & Pin 4, Component Side
      GF0021412Courtesy of FORD MOTOR CO.
      CAUTION: 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 C3328 pin 7 and pin 4, component side.
    • Is the resistance between 290K ohms and 420K ohms? 
    1. YES  : Go to  AN14.
    2. NO  : INSTALL a new cushion TED. REFER to Seat Cushion Thermo-Electric Device . REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable.

      CONNECT passenger safety belt buckle pretensioner C3202. CONNECT passenger seat side air bag module C327.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  14. AN14 CHECK THE TED INSTALLATION AND FOR CRUSHED SEAT CUSHION 
    • Key in OFF position.
    • Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of SUPPLEMENTAL RESTRAINT SYSTEM .
    • 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 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 are there no signs of damage to the foam pad and manifold? 
    1. YES  : CONNECT the battery ground cable.

      CARRY OUT programmable module installation (PMI) and INSTALL a new CCSM. REFER to Climate Controlled Seat Module . REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable.

      CONNECT passenger safety belt buckle pretensioner C3202. CONNECT passenger seat side air bag module C327.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

    2. NO  : CORRECTLY install the cushion TED or INSTALL a new seat cushion foam pad and/or climate controlled seat manifold. CONNECT the battery ground cable. REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable.

      CONNECT passenger safety belt buckle pretensioner C3202. CONNECT passenger seat side air bag module C327.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

scientia non olet · About LEMON Manuals