Pinpoint Test Ac: DTC B19A1

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: If a seat equipped with a seat mounted side air bag is being serviced, the Supplemental Restraint System (SRS) must be depowered. Refer to SUPPLEMENTAL RESTRAINT SYSTEM .

NOTE: The air bag warning lamp illuminates when the Restraints Control Module (RCM) fuse is removed and the ignition switch is ON. This is normal operation and does not indicate an SRS fault.

NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.

AC1 CHECK THE CUSHION TED BLOWER MOTOR SPEED CONTROL CIRCUIT FOR A SHORT TO VOLTAGE
- Ignition OFF.
- 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 C313.
- Disconnect: DCSM C3305C.
- Connect the battery ground cable. Refer to BATTERY, MOUNTING AND CABLES .
- Ignition ON.
- Measure the voltage between C3305C-3, circuit VHS23 (BN/BU), harness side and ground.
  
  Fig 1: Measuring Voltage Between C3305C-3, Circuit VHS23 (BN/BU), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Is any voltage present?
  - Yes: GO to AC2.
  - No: GO to AC3.
AC2 CHECK THE CUSHION TED BLOWER MOTOR SPEED CONTROL CIRCUIT FOR A SHORT TO VOLTAGE
- Disconnect: Cushion TED C3303.
- Measure the voltage between DCSM C3305C-3, circuit VHS23 (BN/BU), harness side and ground.
  
  Fig 2: Measuring Voltage Between DCSM C3305C-3, Circuit VHS23 (BN/BU), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Is any voltage present?
  - 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 .
  - No: GO to AC3.
AC3 CHECK THE CUSHION TED BLOWER MOTOR SPEED CONTROL AND BLOWER MOTOR FEED CIRCUITS FOR A SHORT TOGETHER
- Ignition OFF.
- Disconnect: Cushion TED C3303.
- Measure the resistance between DCSM C3305C-3, circuit VHS23 (BN/BU), harness side and C3305C-8, circuit CHS08 (BN/YE), harness side.
  
  Fig 3: Measuring Resistance Between DCSM C3305C-3, Circuit VHS23 (BN/BU) And C3305C-8, Circuit CHS08 (BN/YE)
  Courtesy of FORD MOTOR CO.
- Is the resistance greater than 10, 000 ohms?
  - Yes: GO to AC4.
  - No: REPAIR the circuits. 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 .
AC4 CHECK THE CUSHION TED RESISTANCE FOR AN INTERNAL SHORT
- Measure the resistance between cushion TED C3303 pin 2 and pin 7, component side.
  
  Fig 4: Measuring Resistance Between Cushion TED C3303 Pin 2 And Pin 7, Component Side
  Courtesy of FORD MOTOR CO.
- Is the resistance greater than 2, 000, 000 ohms?
  - Yes: INSTALL a new DCSM. 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 .
  - 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 seat side air bag module C313.
    
    REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .