Pinpoint Test AF: DTC B19A4

WARNING: This page is about a different car, the 2010 Mercury Milan, 2010 Lincoln MKZ, and 2010 Ford Fusion. 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.

AF1 CHECK THE BACKREST 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 .
- Disconnect: Driver Seat Side Air Bag C327.
- Disconnect: Passenger Seat Side Air Bag C313.
- Disconnect: DCSM C3305c.
  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 .
- Ignition ON.
- Measure the voltage between C3305c-12, circuit VHS16 (BU/GN), harness side and ground.
  
  Fig 1: Measuring Voltage Between C3305C-12, Circuit VHS16 (BU/GN), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Is any voltage present?

Yes : GO to AF2.
No : GO to AF3.

AF2 CHECK THE BACKREST TED BLOWER MOTOR SPEED CONTROL CIRCUIT FOR A SHORT TO VOLTAGE
- Disconnect: Backrest TED C3310.
- Measure the voltage between C3305c-12, circuit VHS16 (BU/GN), harness side and ground.
  
  Fig 2: Measuring Voltage Between C3305C-12, Circuit VHS16 (BU/GN), 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 driver seat side air bag module C327 and passenger seat side air bag module C313.

REPOWER the SRS . REFER to GENERAL PROCEDURES
No : GO to AF3.

AF3 CHECK THE BACKREST TED BLOWER MOTOR SPEED CONTROL AND BLOWER MOTOR FEED CIRCUITS FOR A SHORT TOGETHER
- Ignition OFF.
- Disconnect: Backrest TED C3310.
- Measure the resistance between DCSM C3305c-12, circuit VHS16 (BU/GN), harness side and C3305c-16, circuit CHS03 (GN/BN), harness side.
  
  Fig 3: Checking Backrest TED Blower Motor Speed Control And Blower Motor Feed Circuits For Short Together
  Courtesy of FORD MOTOR CO.
- Is the resistance greater than 10,000 ohms?

Yes : GO to AF4.
No : REPAIR the circuits. REPEAT the self-test. CLEAR the DTCs.
DISCONNECT the battery ground cable.

CONNECT driver seat side air bag module C327 and passenger seat side air bag module C313.

REPOWER the SRS . REFER to GENERAL PROCEDURES

AF4 CHECK THE BACKREST TED RESISTANCE FOR AN INTERNAL SHORT
- Measure the resistance between backrest TED C3310 pin 2 and pin 7, component side.
  
  Fig 4: Measuring Resistance Between Backrest TED C3310 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 C327 and passenger seat side air bag module C313.

REPOWER the SRS . REFER to GENERAL PROCEDURES
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 C327 and passenger seat side air bag module C313.

REPOWER the SRS . REFER to GENERAL PROCEDURES