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Pinpoint Test Ar: DTC B2730 - Back Over-Temp Detected (Driver)

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. AR1 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 B2730 retrieved during the self-test? 
    1. YES  : Go to  AR2.
    2. NO  : Go to  AR4.
  2. AR2 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: Backrest TED C3322
      • 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-9 & C3036B-10, Circuit VHS35 (VT/OG) & RHS15 (GY/BN)
      GF0021451Courtesy of FORD MOTOR CO.
    • Measure the resistance between CCSM C3036b-9, circuit VHS35 (VT/OG), harness side and ground and between CCSM C3036b-10, circuit RHS15 (GY/BN), harness side and ground.
    • Are the resistances greater than 10,000 ohms? 
    1. YES  : Go to  AR3.
    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. AR3 CHECK THE TED THERMISTOR 
      Fig 2: Measuring Resistance Between Backrest TED C3322 Pin 5 & Pin 8, Component Side
      GF0021408Courtesy of FORD MOTOR CO.
    • Measure the resistance between backrest TED C3322 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 backrest TED. REFER to Seat Backrest 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. AR4 CONFIRM THE FAULT 
    • Verify with the customer that the concern is the seat shuts OFF in heat mode.
      • NOTE: A crushed seat backrest 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 shutting OFF in heat mode or was the fault recreated? 
    1. YES  : Go to  AR5.
    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. AR5 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 backrest and compare it to the airflow from the passenger seat backrest.
    • Is the airflow exhausting from the driver seat backrest comparable to the airflow exhausting from the passenger seat backrest? 
    1. YES  : Go to  AR14.
    2. NO  : Go to  AR6.
  6. AR6 CHECK THE BACKREST BLOWER FOR AN OBSTRUCTION OR RESTRICTED FILTER 
    • Key in OFF position.
    • Inspect the blower of the backrest 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  AF7.
  7. AF7 CHECK THE BACKREST 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 backrest blower for operation.
    • Does the backrest blower operate? 
    1. YES  : Go to  AR14.
    2. NO  : Go to  AR8.
  8. AR8 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: Backrest TED C3322
      • 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-12, Circuit VHS16 (BU/GN) & Backrest TED C3322-7
      GF0021452Courtesy of FORD MOTOR CO.
    • Measure the resistance between CCSM C3036c-12, circuit VHS16 (BU/GN), harness side and backrest TED C3322-7, circuit VHS16 (BU/GN), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  AR9.
    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. AR9 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  AR10.
  10. AR10 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  AR11.
    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. AR11 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) & Backrest TED C3322-2
      GF0021453Courtesy of FORD MOTOR CO.
    • Measure the resistance between CCSM C3036c-16, circuit CHS03 (GN/BN), harness side and backrest TED C3322-2, circuit CHS03 (GN/BN), harness side; and between CCSM C3036c-15, circuit RHS03 (GY/OG), harness side and backrest TED C3322-4, circuit RHS03 (GY/OG), harness side.
    • Are the resistances less than 5 ohms? 
    1. YES  : Go to  AR12.
    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. AR12 CHECK THE BLOWER RESISTANCE 
      Fig 7: Measuring Resistance Between Backrest TED C3322 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 backrest TED C3322 pin 2 and pin 4, component side.
    • Is the resistance between 6,000 ohms and 9,000 ohms? 
    1. YES  : Go to  AR13.
    2. NO  : INSTALL a new backrest TED. REFER to Seat Backrest 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. AR13 CHECK THE BLOWER SPEED CONTROL RESISTANCE 
      Fig 8: Measuring Resistance Between Backrest TED C3322 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 backrest TED C3322 pin 7 and pin 4, component side.
    • Is the resistance between 290K ohms and 420K ohms? 
    1. YES  : Go to  AR14.
    2. NO  : INSTALL a new backrest TED. REFER to Seat Backrest 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. AR14 CHECK THE TED INSTALLATION AND FOR CRUSHED SEAT BACKREST 
    • 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 backrest trim cover. Refer to Seat Backrest Cover - Front, Without Fold Flat .
    • Inspect the seat backrest for the following:
      • 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 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.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

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

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

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