Pinpoint Test Aa: DTC B111C

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.

AA1 CHECK THE TED CIRCUITS FOR AN OPEN

Ignition OFF.
Depower the SRS . Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
Disconnect: Passenger Seat Side Air Bag Module C313.
Disconnect: DCSM C3305a.
Disconnect: Cushion TED C3303.
Disconnect: Backrest TED C3311.

Measure the resistance between DCSM C3305a, harness side and cushion TED C3303, harness side; and between DCSM C3305a, harness side and backrest TED C3311, harness side using the following table below:

CONNECTOR REFERENCE TABLE

DCSM Connector	Circuit	TED Connector
C3305a-A	CHS07 (GY/BU)	C3303-1
C3305a-B	RHS07 (BU)	C3303-3
C3305a-C	CHS06 (BU/BN)	C3311-1
C3305a-D	RHS06 (WH)	C3311-3

Fig 1: Checking TED Circuits For Open

Courtesy of FORD MOTOR CO.

Are the resistances less than 5 ohms?

Yes : GO to AA2.
No : REPAIR the circuit(s). 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 GENERAL PROCEDURES

AA2 CHECK THE TED CIRCUITS FOR A SHORT TO VOLTAGE

Connect the battery ground cable. Refer to BATTERY, MOUNTING AND CABLES .
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.
Ignition ON.

Measure the voltage between DCSM C3305a, harness side and ground using the following table below:

CONNECTOR REFERENCE TABLE

Connector	Circuit
C3305a-A	CHS07 (GY/BU)
C3305a-B	RHS07 (BU)
C3305a-C	CHS06 (BU/BN)
C3305a-D	RHS06 (WH)

Fig 2: Measuring Voltage Between DCSM C3305A, Harness Side And Ground

Courtesy of FORD MOTOR CO.

Is voltage present on any circuits?

Yes : REPAIR the circuit(s). 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 GENERAL PROCEDURES
No : GO to AA3.

AA3 CHECK THE BACKREST AND CUSHION TED RESISTANCE
- Ignition OFF.
- Measure the resistance between:
  - backrest TED C3311 pin 1 and pin 3, component side.
  - cushion TED C3311 pin 1 and pin 3, component side.
  Fig 3: Checking Backrest And Cushion TED Resistance
  Courtesy of FORD MOTOR CO.
- Are the resistances between 0.9 and 10 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 GENERAL PROCEDURES
No : If backrest TED resistance is not between 0.9 and 10 ohms, INSTALL a new backrest TED . REFER to SEAT BACKREST THERMO-ELECTRIC DEVICE . REPEAT the self-test. CLEAR the DTCs.
If cushion TED resistance is not between 0.9 and 10 ohms, 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 GENERAL PROCEDURES