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Pinpoint Test Am: DTC B2729 - Driver 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. AM1 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 B2729 retrieved during the self-test? 
    1. YES  : Go to  AM2.
    2. NO  : Go to  AM4.
  2. AM2 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: Driver seat side air bag C328
    • Disconnect: Driver seat safety belt buckle pretensioner C3201
    • Disconnect: Passenger seat side air bag C327
    • Disconnect: Passenger seat safety belt buckle pretensioner C3202
    • Disconnect: CCSM C3036b
    • Disconnect: Cushion TED C3327
      • 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-7 & C3036B-8, Circuit VHS26 (VT) & RHS05 (YE/VT)
      GF0021396Courtesy of FORD MOTOR CO.
    • Measure the resistance between CCSM C3036b-7, circuit VHS26 (VT), harness side and ground and between CCSM C3036b-8, circuit RHS05 (YE/VT), harness side and ground.
    • Are the resistances greater than 10,000 ohms? 
    1. YES  : Go to  AM3.
    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.

      CONNECT driver safety belt buckle pretensioner C3201. CONNECT driver seat side air bag module C328.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  3. AM3 CHECK THE TED THERMISTOR 
      Fig 2: Measuring Resistance Between Cushion TED C3327 Pin 5 & Pin 8, Component Side
      GF0021408Courtesy of FORD MOTOR CO.
    • Measure the resistance between cushion TED C3327 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.

      CONNECT driver safety belt buckle pretensioner C3201. CONNECT driver seat side air bag module C328.

      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.

      CONNECT driver safety belt buckle pretensioner C3201. CONNECT driver seat side air bag module C328.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  4. AM4 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 driver seat to high heat for at least 15 minutes.
    • Is the customer concern with the seat hutting OFF in heat mode or was the fault recreated? 
    1. YES  : Go to  AM5.
    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. AM5 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 driver seat cushion and compare it to the airflow from the passenger seat cushion.
    • Is the airflow exhausting from the driver seat cushion comparable to the airflow exhausting from the passenger seat cushion? 
    1. YES  : Go to  AM14.
    2. NO  : Go to  AM6.
  6. AM6 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  AM7.
  7. AM7 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  AM14.
    2. NO  : Go to  AM8.
  8. AM8 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: Driver seat side air bag C328
    • Disconnect: Driver seat safety belt buckle pretensioner C3201
    • Disconnect: Passenger seat side air bag C327
    • Disconnect: Passenger seat safety belt buckle pretensioner C3202
    • Disconnect: CCSM C3036c
    • Disconnect: Cushion TED C3327
      • 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 C3265C-11, Circuit VHS18 (BN/GN) & Cushion TED C3035-7
      GF0030828Courtesy of FORD MOTOR CO.
    • Measure the resistance between CCSM C3265c-11, circuit VHS18 (BN/GN), harness side and cushion TED C3035-7, circuit VHS18 (BN/GN), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  AM9.
    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.

      CONNECT driver safety belt buckle pretensioner C3201. CONNECT driver seat side air bag module C328.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  9. AM9 CHECK THE BLOWER CIRCUIT RHS03 (GY/OG) FOR A SHORT TO VOLTAGE 
    • Key in ON position.
      • Fig 4: Measuring Voltage Between CCSM C3036C-15, Circuit RHS03 (GY/OG), Harness Side & Ground
      GF0021399Courtesy of FORD MOTOR CO.
    • Measure the voltage between CCSM C3036c-15, circuit RHS03 (GY/OG), 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.

      CONNECT driver safety belt buckle pretensioner C3201. CONNECT driver seat side air bag module C328.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

    2. NO  : Go to  AM10.
  10. AM10 CHECK THE BLOWER CIRCUIT CHS03 (GN/BN) FOR A SHORT TO GROUND 
    • Key in OFF position.
      • Fig 5: Measuring Resistance Between CCSM C3036C-16, Circuit CHS03 (GN/BN), Harness Side & Ground
      GF0021386Courtesy of FORD MOTOR CO.
    • Measure the resistance between CCSM C3036c-16, circuit CHS03 (GN/BN), harness side and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  AM11.
    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.

      CONNECT driver safety belt buckle pretensioner C3201. CONNECT driver seat side air bag module C328.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  11. AM11 CHECK THE BLOWER CIRCUITS RHS03 (GY/OG) AND CHS03 (GN/BN) FOR AN OPEN 
      Fig 6: Measuring Resistance Between CCSM C3036C-16, Circuit CHS03 (GN/BN) & Cushion TED C3327-2
      GF0021453Courtesy of FORD MOTOR CO.
    • Measure the resistance between CCSM C3036c-16, circuit CHS03 (GN/BN), harness side and cushion TED C3327-2, circuit CHS03 (GN/BN), harness side; and between CCSM C3036c-15, circuit RHS03 (GY/OG), harness side and cushion TED C3327-4, circuit RHS03 (GY/OG), harness side.
    • Are the resistances less than 5 ohms? 
    1. YES  : Go to  AM12.
    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.

      CONNECT driver safety belt buckle pretensioner C3201. CONNECT driver seat side air bag module C328.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  12. AM12 CHECK THE BLOWER RESISTANCE 
      Fig 7: Measuring Resistance Between Cushion TED C3327 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 C3327 pin 2 and pin 4, component side.
    • Is the resistance between 6,000 ohms and 9,000 ohms? 
    1. YES  : Go to  AM13.
    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.

      CONNECT driver safety belt buckle pretensioner C3201. CONNECT driver seat side air bag module C328.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  13. AM13 CHECK THE BLOWER SPEED CONTROL RESISTANCE 
      Fig 8: Measuring Resistance Between Cushion TED C3327 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 C3327 pin 7 and pin 4, component side.
    • Is the resistance between 290K ohms and 420K ohms? 
    1. YES  : Go to  AM14.
    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.

      CONNECT driver safety belt buckle pretensioner C3201. CONNECT driver seat side air bag module C328.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  14. AM14 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  : DISCONNECT the battery ground cable.

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

      CONNECT driver safety belt buckle pretensioner C3201. CONNECT driver seat side air bag module C328.

      ASSEMBLE the driver seat. INSTALL the driver seat into the vehicle. Do not REPOWER or PROVE OUT the SRS at this time 

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

      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.

      CONNECT driver safety belt buckle pretensioner C3201. CONNECT driver seat side air bag module C328.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

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