Pinpoint Test Ag: DTC B19A4

WARNING: This page is about a different car, the 2012 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.

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 repaired, 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.

AG1 CHECK THE BACKREST TED BLOWER SPEED CONTROL CIRCUIT FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Depower the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .
- Disconnect: Driver Seat Side Air Bag Module C3051.
- Disconnect: Passenger Seat Side Air Bag Module C339.
- Disconnect: DCSM C3265C.
- Connect the battery ground cable. REFER to BATTERY, MOUNTING AND CABLES .
- Ignition ON.
- Measure the voltage between C3265C-12, circuit CHS09 (GY), harness side and ground.
  
  Fig 1: Measuring Voltage Between C3265C-12, Circuit CHS09 (GY), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Is any voltage present?
  1. Yes : GO to AG2.
  2. No : GO to AG3.
AG2 CHECK THE BACKREST TED BLOWER SPEED CONTROL CIRCUIT FOR A SHORT TO VOLTAGE
- Disconnect: Backrest TED C3034.
- Measure the voltage between C3265C-12, circuit CHS09 (GY), harness side and ground.
  
  Fig 2: Measuring Voltage Between C3265C-12, Circuit CHS09 (GY), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Is any voltage present?
  1. Yes : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
    DISCONNECT the battery ground cable.
    
    CONNECT driver seat side air bag module C3051 and passenger seat side air bag module C339.
    
    REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .
  2. No : GO to AG3.
AG3 CHECK THE BACKREST TED BLOWER SPEED CONTROL AND BLOWER OUTPUT CIRCUITS FOR A SHORT TOGETHER
- Ignition OFF.
- Disconnect: Backrest TED C3034.
- Measure the resistance between DCSM C3265C-12, circuit CHS09 (GY), harness side and C3265C-16, circuit CHS03 (GN/BN), harness side.
  
  Fig 3: Measuring Resistance Between DCSM C3265C-12, Circuit CHS09 (GY) And C3265C-16, Circuit CHS03 (GN/BN)
  Courtesy of FORD MOTOR CO.
- Is the resistance greater than 10, 000 ohms?
  1. Yes : GO to AG4.
  2. No : REPAIR the circuits. CLEAR the DTCs. REPEAT the self-test.
    DISCONNECT the battery ground cable.
    
    CONNECT driver seat side air bag module C3051 and passenger seat side air bag module C339.
    
    REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .
AG4 CHECK THE BACKREST TED RESISTANCE FOR AN INTERNAL SHORT
- Measure the resistance between backrest TED C3034 pins 2 and 7, component side.
  
  Fig 4: Measuring Resistance Between Backrest TED C3034 Pins 2 And 7, Component Side
  Courtesy of FORD MOTOR CO.
- Is the resistance greater than 10, 000 ohms?
  1. Yes : INSTALL a new DCSM. REFER to DUAL CLIMATE CONTROLLED SEAT MODULE (DCSM) . CLEAR the DTCs. REPEAT the self-test.
    DISCONNECT the battery ground cable.
    
    CONNECT driver seat side air bag module C3051 and passenger seat side air bag module C339.
    
    REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .
  2. No : INSTALL a new backrest TED. REFER to SEAT BACKREST THERMO-ELECTRIC DEVICE . CLEAR the DTCs. REPEAT the self-test. CONNECT driver seat side air bag module C3051 and passenger seat side air bag module C339. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .