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Pinpoint Test T: The Heated Seats Are Inoperative - Front

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. T1 CHECK THE VOLTAGE TO THE HEATED SEAT MODULE 
    • 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: Heated Seat Module C329
      • 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.
    • Key in ON position.
      • Fig 1: Measuring Voltage Between Heated Seat Module C329-2 & C329-1, Circuit CBP35 (YE/GY) & SBB16 (VT/RD)
      GF0016377Courtesy of FORD MOTOR CO.
    • Measure the voltage between heated seat module C329-2, circuit CBP35 (YE/GY), harness side and ground; and between heated seat module C329-1, circuit SBB16 (VT/RD), harness side and ground.
    • Are the voltages greater than 10 volts? 
    1. YES  : Go to  T2.
    2. NO  : VERIFY battery junction box (BJB) fuse 16 (30A) and smart power distribution junction box (SPDJB) fuse 35 (10A) are OK. If OK, REPAIR the affected circuit. TEST the system for normal operation.

      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. T2 CHECK THE HEATED SEAT MODULE GROUND 
    • Key in OFF position.
      • Fig 2: Measuring Resistance Between Heated Seat Module C329-7, Circuit GD133 (BK) & Ground
      GF0016378Courtesy of FORD MOTOR CO.
    • Measure the resistance between heated seat module C329-7, circuit GD133 (BK), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  T3.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.

      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. T3 CHECK THE SENSOR RETURN CIRCUIT FOR SHORT TO VOLTAGE 
    • Key in ON position.
      • Fig 3: Measuring Resistance Between Heated Seat Module C329-13, Circuit RHS05 (YE/VT) & Ground
      GF0030783Courtesy of FORD MOTOR CO.
    • Measure the voltage between heated seat module C329-13, circuit RHS05 (YE/VT), harness side and ground.
    • Is voltage present? 
    1. YES  : REPAIR the circuit. TEST the system for normal operation.

      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  T4.
  4. T4 CHECK THE SENSOR RETURN CIRCUIT FOR SHORT TO GROUND 
    • Key in OFF position.
      • Fig 4: Measuring Resistance Between Heated Seat Module C329-13, Circuit RHS05 (YE/VT) & Ground
      GF0030784Courtesy of FORD MOTOR CO.
    • Measure the resistance between heated seat module C329-13, circuit RHS05 (YE/VT), harness side and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  T5.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.

      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 .

  5. T5 CHECK THE SENSOR RETURN CIRCUIT FOR AN OPEN 
    • Disconnect: Passenger Heated Seat C3284
      • Fig 5: Measuring Resistance Between Heated Seat Module C329-13, Circuit RHS05 (YE/VT) & Passenger Heated Seat C3284-3
      GF0030785Courtesy of FORD MOTOR CO.
    • Measure the resistance between heated seat module C329-13, circuit RHS05 (YE/VT), harness side and passenger heated seat C3284-3, circuit RHS05 (YE/VT), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  T6.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.

      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 .

  6. T6 CHECK THE HEATED SEAT GROUND 
      Fig 6: Measuring Resistance Between Heated Seat C3284-4, Circuit GD145 (BK/BU) & Ground
      GF0030786Courtesy of FORD MOTOR CO.
    • Measure the resistance between heated seat C3284-4, circuit GD145 (BK/BU), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : INSTALL a new heated seat module. REFER to Heated Seat Module - Front . TEST the system for normal operation.

      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  : REPAIR the circuit. TEST the system for normal operation.

      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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