Pinpoint Test Y: DTC B103D

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.

Y1 CHECK THE BLOWER MOTOR FEED CIRCUIT FOR A SHORT TO GROUND
- Ignition OFF.
- Depower the SRS . Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
- Disconnect: Driver Seat Side Air Bag Module C327.
- Disconnect: Passenger Seat Side Air Bag Module C313.
- Disconnect: DCSM C3305c.
- Disconnect: Cushion TED C3300.
- Disconnect: Backrest TED C3310.
- Measure the resistance between DCSM C3305c-16, circuit CHS03 (GN/BN), harness side and ground.
  
  Fig 1: Measuring Resistance Between DCSM C3305C-16, Circuit CHS03 (GN/BN), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance greater than 10,000 ohms?

Yes : GO to Y2.
No : REPAIR the circuit. REPEAT the self-test.
DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C327. CONNECT passenger seat side air bag module C313. REPOWER the SRS . REFER to GENERAL PROCEDURES

Y2 CHECK FOR A SHORT BETWEEN THE BLOWER MOTOR FEED AND GROUND CIRCUITS
- Measure the resistance between DCSM C3305c-15, circuit RHS03 (GY/OG), harness side and C3305c-16, circuit CHS03 (GN/BN), harness side.
  
  Fig 2: Measuring Resistance Between DCSM C3305C-15, Circuit RHS03 (GY/OG) And C3305C-16, Circuit CHS03 (GN/BN), Harness Side
  Courtesy of FORD MOTOR CO.
- Is the resistance greater than 10,000 ohms?

Yes : GO to Y3.
No : REPAIR the circuits. REPEAT the self-test. CLEAR the DTCs.
DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C327. CONNECT passenger seat side air bag module C313. REPOWER the SRS . REFER to GENERAL PROCEDURES

Y3 CHECK THE BACKREST AND CUSHION BLOWER MOTOR RESISTANCE
NOTE: The ohmmeter must be connected with the positive lead to pin 2 and the negative lead to pin 4 when measuring. Ohmmeter leads incorrectly connected will result in false readings and lead to incorrect identification of components that are not faulty.
- Measure the resistance between:
  - backrest TED C3310 pin 2 and pin 4, component side.
  - cushion TED C3300 pin 2 and pin 4, component side.
  Fig 3: Checking Backrest And Cushion Blower Motor Resistance
  Courtesy of FORD MOTOR CO.
- Are the resistances between 4,000 and 10,000 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. CONNECT passenger seat side air bag module C313. REPOWER the SRS . REFER to GENERAL PROCEDURES
No : If cushion TED resistance is not between 4,000 and 10,000 ohms, INSTALL a new cushion TED . REFER to SEAT CUSHION THERMO-ELECTRIC DEVICE . REPEAT the self-test. CLEAR the DTCs.
If backrest TED resistance is not between 4,000 and 10,000 ohms, INSTALL a new backrest TED . REFER to SEAT BACKREST THERMO-ELECTRIC DEVICE . REPEAT the self-test. CLEAR the DTCs.

DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C327. CONNECT passenger seat side air bag module C313. REPOWER the SRS . REFER to GENERAL PROCEDURES