LEMON Manuals: Even more car manuals for everyone
Home >> Lincoln >> 2012 >> MKZ Hybrid >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Seat System - Seats >> Diagnosis And Testing >> Seats >> Pinpoint Tests >> Pinpoint Test AS: DTC B2730 >> Pinpoint Test As: DTC B2730

Pinpoint Test As: DTC B2730

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. AS1 CHECK THE DCSM FOR ON-DEMAND DTCs 
    • Start the vehicle and set the driver seat to HIGH heat.
    • Enter the following diagnostic mode on the scan tool: Self Test - DCSM.
    • Was DTC B2730 retrieved on-demand during the self-test? 
      • Yes:  GO to  AS2.
      • No:  GO to  AS5.
  2. AS2 CHECK THE DRIVER SEAT BACKREST TED THERMISTOR CIRCUITS FOR A SHORT TO GROUND 
    • Ignition OFF.
    • 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 C327 and Passenger Seat Side Air Bag C313.
    • Disconnect: DCSM C3305B.
    • Disconnect: Driver Seat Backrest TED C3310.
      • 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 .
    • Measure the resistance between:
      • DCSM C3305B-9, circuit VHS35 (VT/OG), harness side and ground.
      • DCSM C3305B-10, circuit RHS15 (GY/BN), harness side and ground.
      Fig 1: Checking Driver Seat Backrest TED Thermistor Circuits For Short To Ground
      G06134527Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10, 000 ohms? 
      • Yes:  GO to  AS3.
      • No:  REPAIR the circuit(s). CLEAR the DTCs. REPEAT the self-test.

        DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C327 and passenger seat side air bag module C313.

        REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  3. AS3 CHECK THE DRIVER SEAT BACKREST TED THERMISTOR AND WIRING 
    • Connect: Driver Seat Backrest TED C3310.
    • Measure the resistance between DCSM C3305B-9, circuit VHS35 (VT/OG), harness side and DCSM C3305B-10, circuit RHS15 (GY/BN), harness side. Note the ambient temperature and refer to the following 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 2: Checking Driver Seat Backrest TED Thermistor And Wiring
      G06134489Courtesy of FORD MOTOR CO.
    • Is the resistance within the limits indicated? 
      • Yes:  GO to  AS18.
      • No:  GO to  AS4.
  4. AS4 CHECK THE DRIVER SEAT BACKREST TED THERMISTOR 
    • Disconnect: Driver Seat Backrest TED C3310.
    • Measure the resistance between driver seat backrest TED C3310 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) 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 3: Checking Driver Seat Backrest TED Thermistor
      G06134440Courtesy of FORD MOTOR CO.
    • Is the resistance within the limits indicated? 
      • Yes:  REPAIR circuit VHS35 (VT/OG) or RHS15 (GY/BN) for an open or high resistance. CLEAR the DTCs. REPEAT the self-test.

        DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C327 and passenger seat side air bag module C313.

        REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

      • No:  INSTALL a new driver seat backrest TED. REFER to Seat Backrest Thermo-Electric Device  . CLEAR the DTCs. REPEAT the self-test.

        DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C327 and passenger seat side air bag module C313.

        REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  5. AS5 CONFIRM THE FAULT WHILE MONITORING THE DCSM SEAT BACK THERMAL ELECTRIC DEVICE TEMPERATURE (BK_TEMP) AND SEAT CUSHION THERMAL ELECTRIC DEVICE TEMPERATURE (CSHTEMP) PIDs 
    • Set the driver seat to OFF.
    • Enter the following diagnostic mode on the scan tool: Clear DTCs - DCSM.
    • Enter the following diagnostic mode on the scan tool: DataLogger - DCSM.
    • Monitor the DCSM PIDs BK_TEMP and CSHTEMP.
      • NOTE: A crushed seat backrest foam pad or a crushed climate controlled seat manifold may be the cause of the fault making it necessary to occupy the seat to recreate and identify the fault.
    • Attempt to recreate the fault. Start the vehicle and set the driver seat to HIGH heat for at least 15 minutes while occupying the seat.
    • Do the PIDs increase incrementally (gradually) and stay within 15°C (27°F) of each other? 
      • Yes:  Fault not present at this time. Fault may have been set due to a past failure, incorrect use of the climate controlled seat system by repeated switching between heat and cool modes or due to excessive driver compartment temperature. CLEAR the DTCs. REPEAT the self-test.
      • No:  If the BK_TEMP PID increases incrementally and is greater than 15°C (27°F) of the CSHTEMP PID, GO to  AS6.

        If the BK_TEMP PID increases quickly (temperature "jumps" and does not increase incrementally) and is greater than 15°C (27°F) of the CSHTEMP PID, GO to  AS16.

  6. AS6 COMPARE OPERATION OF THE DRIVER AND PASSENGER SEATS 
    • With the engine running, set both front seats to HIGH cool.
    • Note the airflow exhausting from the driver seat backrest TED and compare it to the airflow exhausting from the passenger seat backrest TED.
    • Carry out a wiggle test of the wire harnesses between the DCSM and the driver seat backrest TED while monitoring blower operation of the TED. The blower should operate consistently and not change speeds
    • Is the airflow exhausting from the driver seat backrest TED comparable to the airflow exhausting from the passenger seat backrest TED with no change in operation when carrying out the wiggle test? 
      • Yes:  GO to  AS7.
      • No:  If the airflow exhausting from the driver seat backrest TED is not comparable to the airflow exhausting from the driver seat backrest TED, GO to  AS8.

        If the passenger seat backrest TED blower operation changed while carrying out the wiggle test, IDENTIFY and REPAIR the wiring fault. CLEAR the DTCs. REPEAT the self-test.

  7. AS7 COMPARE OPERATION OF THE DRIVER AND PASSENGER SEATS WHILE OCCUPIED 
    • Note the airflow exhausting from the passenger seat backrest TED with the driver seat occupied and compare it to the airflow exhausting from the passenger seat backrest TED with the passenger seat occupied.
    • Is the airflow exhausting from the driver seat backrest TED comparable to the airflow exhausting from the passenger seat backrest TED? 
      • Yes:  GO to  AS16.
      • No:  INSTALL a new driver seat backrest foam pad and/or climate controlled seat manifold. CLEAR the DTCs. REPEAT the self-test.
  8. AS8 CHECK THE DRIVER SEAT BACKREST BLOWER FOR AN OBSTRUCTION OR RESTRICTED FILTER 
    • Ignition OFF.
    • Inspect the blower of the driver seat backrest TED assembly for an obstruction or for a restricted filter.
    • Is the blower obstructed or the filter restricted? 
      • Yes:  REMOVE the obstruction or INSTALL a new filter. CLEAR the DTCs. REPEAT the self-test.
      • No:  GO to  AS9.
  9. AS9 CHECK THE DRIVER SEAT BACKREST BLOWER SPEED CONTROL CIRCUIT FOR AN OPEN 
    • 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 C327 and Passenger Seat Side Air Bag C313.
    • Disconnect: DCSM C3305C.
    • Disconnect: Driver Seat Backrest TED C3310.
      • 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 .
    • Measure the resistance between DCSM C3305C-12, circuit VHS16 (BU/GN), harness side and driver seat backrest TED C3310-7, circuit VHS16 (BU/GN), harness side.
      Fig 4: Measuring Resistance Between DCSM C3305C-12, Circuit VHS16 (BU/GN) And Driver Seat Backrest TED C3310-7, Circuit VHS16 (BU/GN)
      G08026960Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
      • Yes:  GO to  AS10.
      • No:  REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

        DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C327 and passenger seat side air bag module C313.

        REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  10. AS10 CHECK THE DRIVER SEAT BACKREST BLOWER CIRCUIT FOR A SHORT TO VOLTAGE 
    • Ignition ON.
    • Measure the voltage between DCSM C3305C-15, circuit RHS03 (GY/OG), harness side and ground.
      Fig 5: Measuring Voltage Between DCSM C3305C-15, Circuit RHS03 (GY/OG), Harness Side And Ground
      G06077035Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
      • Yes:  REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

        DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C327 and passenger seat side air bag module C313.

        REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

      • No:  GO to  AS11.
  11. AS11 CHECK THE DRIVER SEAT BACKREST BLOWER CIRCUIT FOR A SHORT TO GROUND 
    • Ignition OFF.
    • Measure the resistance between DCSM C3305C-16, circuit CHS03 (GN/BN), harness side and ground.
      Fig 6: Measuring Resistance Between DCSM C3305C-16, Circuit CHS03 (GN/BN), Harness Side And Ground
      G06134392Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10, 000 ohms? 
      • Yes:  GO to  AS12.
      • No:  REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

        DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C327 and passenger seat side air bag module C313.

        REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  12. AS12 CHECK THE DRIVER SEAT BACKREST BLOWER CIRCUITS FOR AN OPEN 
    • Measure the resistance between:
      • DCSM C3305C-16, circuit CHS03 (GN/BN), harness side and driver seat backrest TED C3310-2, circuit CHS03 (GN/BN), harness side.
      • DCSM C3305C-15, circuit RHS03 (GY/OG), harness side and driver seat backrest TED C3310-4, circuit RHS03 (GY/OG), harness side.
      Fig 7: Checking Driver Seat Backrest Blower Circuits For Open
      G06259374Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
      • Yes:  GO to  AS13.
      • No:  REPAIR the circuit(s). CLEAR the DTCs. REPEAT the self-test.

        DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C327 and passenger seat side air bag module C313.

        REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  13. AS13 CHECK THE DRIVER SEAT BACKREST 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 results in false readings and leads to incorrect identification of components that are not damaged.
      Fig 8: Measuring Resistance Between Driver Seat Backrest TED C3310 Pin 2 And Pin 4, Component Side
      G06134445Courtesy of FORD MOTOR CO.
    • Measure the resistance between driver seat backrest TED C3310 pin 2 and pin 4, component side.
    • Is the resistance between 4, 000 ohms and 10, 000 ohms? 
  14. AS14 CHECK THE DRIVER SEAT BACKREST BLOWER SPEED CONTROL RESISTANCE 
      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 results in false readings and leads to incorrect identification of components that are not damaged.
      Fig 9: Measuring Resistance Between Driver Seat Backrest TED C3310 Pin 7 And Pin 4, Component Side
      G06134446Courtesy of FORD MOTOR CO.
    • Measure the resistance between driver seat backrest TED C3310 pin 7 and pin 4, component side.
    • Is the resistance between 240K ohms and 400K ohms? 
  15. AS15 CHECK THE DRIVER SEAT BACKREST TED INSTALLATION AND FOR CRUSHED SEAT BACKREST 
    • Ignition OFF.
    • Remove the driver seat. Refer to Seat - Front  .
    • Remove the driver seat backrest cover. Refer to Seat Backrest Cover - Front  .
    • Inspect the driver seat backrest for the following:
      • Is the driver seat backrest TED correctly installed?
      • Is the driver seat backrest foam pad crushed or restricted?
      • Is the driver seat backrest climate controlled seat manifold crushed or restricted?
    • Is the driver seat backrest TED correctly installed and are there no signs of damage to the foam pad and manifold? 
      • Yes:  INSTALL the driver seat backrest cover and seat and GO to  AS18.
      • No:  CORRECTLY install the driver seat backrest TED or INSTALL a new driver seat backrest foam pad and/or climate controlled seat manifold. CONNECT the battery ground cable. REFER to BATTERY, MOUNTING AND CABLES . CLEAR the DTCs. REPEAT the self-test.

        DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C327 and passenger seat side air bag module C313.

        REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  16. AS16 CHECK THE DRIVER SEAT BACKREST TED THERMISTOR AND WIRING 
    • Ignition OFF.
    • 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 C327 and 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 .
    • Measure the resistance between DCSM C3305B-9, circuit VHS35 (VT/OG), harness side and C3305B-10 circuit RHS15 (GY/BN), harness side. Note the ambient temperature and refer to the following 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 10: Checking Driver Seat Backrest TED Thermistor And Wiring
      G06134489Courtesy of FORD MOTOR CO.
    • Is the resistance within the limits indicated? 
      • Yes:  GO to  AS18.
      • No:  GO to  AS17.
  17. AS17 CHECK THE DRIVER SEAT BACKREST TED THERMISTOR 
    • Measure the resistance between driver seat backrest TED C3310 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) 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 11: Checking Driver Seat Backrest TED Thermistor
      G06134440Courtesy of FORD MOTOR CO.
    • Is the resistance within the limits indicated? 
      • Yes:  REPAIR circuit VHS35 (VT/OG) or RHS15 (GY/BN) for an open or high resistance. CLEAR the DTCs. REPEAT the self-test.

        DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C327 and passenger seat side air bag module C313.

        REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

      • No:  INSTALL a new TED. REFER to Seat Backrest Thermo-Electric Device  . CLEAR the DTCs. REPEAT the self-test.

        DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C327 and passenger seat side air bag module C313.

        REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  18. AS18 CHECK THE DRIVER SEAT BACKREST TED HEATING/COOLING CIRCUITRY CURRENT DRAW 
    • Connect: All DCSM, TED and Body Harness-to-Seat Harness Connectors.
      • NOTE: It may be necessary to open the seat wire harness conduit to allow placing the inductive current probe around the circuit as described in the following step. Care must be taken when opening up the wire harness so as not to damage any wiring or connectors. Do not damage any wiring or induce stress on any wiring or connectors. Close up the wire harness once repairs to the seat are complete.
      NOTE: Use a commercially available inductive current probe (such as Electronic Specialties Current Probe/Multimeter 685 or a Fluke I410 [used with a digital multimeter]) or the low current probe from the Vehicle Measurement Module available for use with Integrated Diagnostic System (IDS). If these are unavailable, the inductive current probe feature from a battery tester may be substituted.
    • Place an inductive current probe around circuit CHS01 (GY/VT) near DCSM C3305A-J and monitor the current draw.
    • Start the vehicle and set the driver seat to HIGH heat.
    • Is the current draw less than 11 amps? 
  19. AS19 CHECK RESISTANCE OF THE DRIVER SEAT BACKREST TED AND WIRING 
    • Ignition OFF.
    • Disconnect: DCSM C3305A.
    • Measure the resistance between DCSM C3305A-J circuit CHS01 (GY/VT), harness side and C3305A-K, circuit RHS01 (WH/VT), harness side.
      Fig 12: Checking Resistance Of Driver Seat Backrest TED And Wiring
      G07934666Courtesy of FORD MOTOR CO.
    • Is the resistance between 0.9 and 10 ohms? 
      • Yes:  GO to  AS21.
      • No:  GO to  AS20.
  20. AS20 CHECK THE RESISTANCE OF THE DRIVER SEAT BACKREST TED 
    • Disconnect: Driver Seat Backrest TED C3310.
    • Measure the resistance between driver seat backrest TED C3310 pin 1 and pin 3, component side.
      Fig 13: Measuring Resistance Between Driver Seat Backrest TED C3310 Pin 1 And Pin 3, Component Side
      G06134384Courtesy of FORD MOTOR CO.
    • Is the resistance between 0.9 and 10 ohms? 
      • Yes:  REPAIR circuit CHS01 (GY/VT) or RHS01 (WH/VT) for an open or high resistance. CLEAR the DTCs. REPEAT the self-test.

        DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C327 and passenger seat side air bag module C313.

        REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

      • No:  INSTALL a new driver seat backrest TED. REFER to Seat Backrest Thermo-Electric Device  . CLEAR the DTCs. REPEAT the self-test.

        DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C327 and passenger seat side air bag module C313.

        REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  21. AS21 CHECK FOR CORRECT DCSM OPERATION 
    • Inspect the DCSM and driver seat backrest TED harness and component side connectors and the body harness-to-seat harness connectors for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect: All DCSM, TED and Body Harness-to-Seat Harness Connectors.
    • Make sure the connectors are seated correctly.
    • Start the engine.
    • Set the driver seat to OFF.
    • Enter the following diagnostic mode on the scan tool: Clear DTCs - DCSM.
    • Attempt to recreate the fault. With the engine still running set the driver seat to HIGH heat for at least 15 minutes.
    • Is the concern still present? 
      • Yes:  INSTALL a new DCSM. REFER to Dual Climate Controlled Seat Module (DCSM)  . REPEAT the self-test. TEST the system for normal operation.

        DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C327 and passenger seat side air bag module C313.

        REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

      • No:  The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.

        DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C3051 and passenger seat side air bag module C313.

        REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

scientia non olet · About LEMON Manuals