Pinpoint Test Am: DTC B19A4

WARNING: This page is about a different car, the 2010 Lincoln MKX and 2010 Ford Edge. 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: 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.

AM1 CHECK BACKREST TED BLOWER SPEED CONTROL CIRCUIT VHS16 (BU/GN) FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Depower the SRS . Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
- Disconnect: Driver Seat Side Air Bag C328.
- Disconnect: Passenger Seat Side Air Bag C327.
- Disconnect: DCSM C3036c.
- Connect the battery ground cable. Refer to BATTERY, MOUNTING AND CABLES .
- Ignition ON.
- Measure the voltage between C3036c-12, circuit VHS16 (BU/GN), harness side and ground.
  
  Fig 1: Measuring Voltage Between C3036c-12, Circuit VHS16 (BU/GN), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Is any voltage present?
- Yes: GO to AM2 .
- No: GO to AM3.
AM2 CHECK BACKREST TED BLOWER SPEED CONTROL CIRCUIT VHS16 (BU/GN) FOR A SHORT TO VOLTAGE
- Disconnect: Backrest TED C3034.
- Measure the voltage between C3265c-12, circuit VHS16 (BU/GN), harness side and ground.
  
  Fig 2: Measuring Resistance Between DCSM C3036c-3, Circuit VHS23 (BN/BU) And C3036c-8, Circuit CHS08 (BN/YE)
  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 driver seat side air bag module C328 and passenger seat side air bag module C327.
  
  REPOWER the SRS . REFER to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
- No: GO to AM3 .
AM3 CHECK BACKREST TED BLOWER SPEED CONTROL AND BLOWER OUTPUT CIRCUITS VHS16 (BU/GN) AND CHS03 (GN/BN) FOR A SHORT TOGETHER
- Ignition OFF.
- Disconnect: Backrest TED C3322.
- Measure the resistance between DCSM C3036c-12, circuit VHS16 (BU/GN), harness side and C3036c-16, circuit CHS03 (GN/BN), harness side.
  
  Fig 3: Measuring Resistance Between DCSM C3036c-12, Circuit VHS16 (BU/GN) And C3036c-16, Circuit CHS03 (GN/BN)
  Courtesy of FORD MOTOR CO.
- Is the resistance greater than 10,000 ohms?
- Yes: GO to AM4 .
- No: REPAIR the circuits. REPEAT the self-test. CLEAR the DTCs.
  DISCONNECT the battery ground cable.
  
  CONNECT driver seat side air bag module C328 and passenger seat side air bag module C327.
  
  REPOWER the SRS . REFER to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
AM4 CHECK THE BACKREST TED RESISTANCE FOR AN INTERNAL SHORT
- Measure the resistance between backrest TED C3322 pin 2 and pin 7, component side.
  
  Fig 4: Measuring Resistance Between Cushion TED C3328 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 driver seat side air bag module C328 and passenger seat side air bag module C327.
  
  REPOWER the SRS . REFER to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
- No: INSTALL a new backrest TED . REFER to SEAT BACKREST THERMO-ELECTRIC DEVICE . REPEAT the self-test. CLEAR the DTCs.
  CONNECT driver seat side air bag module C328 and passenger seat side air bag module C327.
  
  REPOWER the SRS . REFER to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .