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Home >> Mercury >> 2008 >> Milan Base, 2.3 Z, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 1394 (Seat System - Seating) >> Diagnostic Tests >> Seats >> Pinpoint Tests >> Pinpoint Test AE: DTC B272F - Passenger Ignition Run/Blower Circuit Short to Ground >> Pinpoint Test AE: DTC B272F - Passenger Ignition Run/Blower Circuit Short To Ground

Pinpoint Test AE: DTC B272F - Passenger Ignition Run/Blower Circuit Short To Ground

WARNING: This page is about a different car, the 2009 Mercury Milan, 2009 Lincoln MKZ, and 2009 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
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. AE1 CHECK DCSM PASSENGER TED HEAT MODE (TED_HEAT_P) PID 
    • Access the cushion and backrest TEDs and remove the filters to watch the TED fans.
    • Connect the diagnostic tool.
    • Enter the following diagnostic mode on the diagnostic tool: DataLogger/DCSM PID TED_HEAT_P
      • NOTE: The DCSM active command TED_HEAT_P is limited to 15 seconds in the ON state.
    • Operate the climate controlled seat using the active command while monitoring the cushion and backrest TEDs for fan movement.
    • Did both fans turn on? 
    1. YES  : CARRY OUT the network test. If DTCs are retrieved from the HVAC module, REFER to the DTC Chart in the Diagnosis and Testing portion of MULTIFUNCTION ELECTRONIC MODULES article. If no DTCs are retrieved, CARRY OUT the HVAC Module Cold Boot Process in the Diagnosis and Testing portion of CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS article.
    2. NO  : Go to  AE2.
  2. AE2 CHECK FOR AN INTERMITTENT CONNECTION AT THE DCSM 
    • Key in OFF position.
    • Disconnect: DCSM C3305c
    • Connect: DCSM C3305c
    • With the engine running and using the switches on the HVAC module, turn the passenger climate controlled seat system on while monitoring the cushion and backrest fans for movement.
      • If there is fan movement, run the passenger climate controlled seat system for 2 minutes.
    • Did the climate controlled seat operate correctly? 
    1. YES  : The fault is intermittent. CHECK for causes of the intermittent fault at C3305c and REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.
    2. NO  : Go to  AE3.
  3. AE3 CHECK FOR AN INTERMITTENT CONNECTION AT THE CUSHION TED 
    • Key in OFF position.
    • Disconnect: Cushion TED C3303
    • Connect: Cushion TED C3303
    • With the engine running and using the switches on the HVAC module, turn the passenger climate controlled seat system on while monitoring the cushion and backrest fans for movement.
      • If there is fan movement, run the passenger climate controlled seat system for 2 minutes.
    • Did the climate controlled seat operate correctly? 
    1. YES  : The fault is intermittent. CHECK for causes of the intermittent fault at C3303 and REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.
    2. NO  : Go to  AE4.
  4. AE4 CHECK FOR AN INTERMITTENT CONNECTION AT THE BACKREST TED 
    • Key in OFF position.
    • Disconnect: Backrest TED C3311
    • Connect: Backrest TED C3311
    • With the engine running and using the switches on the HVAC module, turn the passenger climate controlled seat system on while monitoring the cushion and backrest fans for movement.
      • If there is fan movement, run the passenger climate controlled seat system for 2 minutes.
    • Did the climate controlled seat operate correctly? 
    1. YES  : The fault is intermittent. CHECK for causes of the intermittent fault at C3311 and REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.
    2. NO  : Go to  AE5.
  5. AE5 CHECK BLOWER CIRCUIT CHS08 (BN/YE) FOR A SHORT TO VOLTAGE 
    • 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 article.
    • Disconnect the passenger seat side air bag C313.
    • Disconnect: DCSM C3305c
    • Disconnect: Cushion TED C3303
    • Disconnect: Backrest TED C3311
      • 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 article.
    • Key in ON position.
      • Fig 1: Measuring Voltage
      GF0041215Courtesy of FORD MOTOR CO.
    • Measure the voltage between DCSM C3305c-8, circuit CHS08 (BN/YE), harness side and ground.
    • Is any voltage present? 
    1. YES  : REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.

    2. NO  : Go to  AE6.
  6. AE6 CHECK CUSHION TED BLOWER CIRCUITS CHS08 (BN/YE) AND RHS08 (VT/WH) FOR AN OPEN 
      Fig 2: Checking Circuit For Open
      GF0021406Courtesy of FORD MOTOR CO.
    • Measure the resistance between DCSM C3305c-8, circuit CHS08 (BN/YE), harness side and cushion TED C3303-2, circuit CHS08 (BN/YE), harness side; and between DCSM C3305c-7, circuit RHS08 (VT/WH), harness side and cushion TED C3303-4, circuit RHS08 (VT/WH), harness side.
    • Are the resistances less than 5 ohms? 
    1. YES  : Go to  AE7.
    2. NO  : REPAIR the affected circuit. REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.

  7. AE7 CHECK BACKREST TED BLOWER CIRCUITS CHS08 (BN/YE)/CHS08 (GY/RD) AND RHS08 (VT/WH) FOR AN OPEN 
      Fig 3: Checking Circuit For Open
      GF0021406Courtesy of FORD MOTOR CO.
    • Measure the resistance between DCSM C3305c-8, circuit CHS08 (BN/YE), harness side and backrest TED C3311-2, circuit CHS08 (GY/RD), harness side; and between DCSM C3305c-7, circuit RHS08 (VT/WH), harness side and backrest TED C3311-4, circuit RHS08 (VT/WH), harness side.
    • Are the resistances less than 5 ohms? 
    1. YES  : Go to  AE8.
    2. NO  : REPAIR the affected circuit. REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.

  8. AE8 CHECK BLOWER RESISTANCE 
      Fig 4: Checking Blower Resistance
      GF0021401Courtesy of FORD MOTOR CO.
      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 and between backrest TED C3311 pin 2 and pin 4, component side.
    • Are the resistances between 6,000 ohms and 9,000 ohms? 
    1. YES  : INSTALL a new DCSM and CARRY OUT programmable module installation (PMI). REFER to Dual Climate Controlled Seat Module (DCSM) . REPEAT the self-test. CLEAR the DTCs.

      DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.

    2. NO  : If the resistance of the cushion TED was not  between 6,000 and 9,000 ohms, INSTALL a new cushion TED. REFER to Seat Cushion Thermo-Electric Device . REPEAT the self-test. CLEAR the DTCs.

      If the resistance of the backrest TED was not  between 6,000 and 9,000 ohms, 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 seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.

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