Pinpoint Test D: The Power Seat Is Inoperative - Fusion/MILAN, Passenger

WARNING: This page is about a different car, the 2011 Mercury Milan, 2011 Lincoln MKZ, and 2011 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: If a seat equipped with a seat mounted side air bag is being serviced, the Supplemental Restraint System (SRS) must be depowered. Refer to SUPPLEMENTAL RESTRAINT SYSTEM -- FUSION, MILAN & MKZ article.

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.

D1 CHECK FOR VOLTAGE AT THE SEAT CONTROL SWITCH
- Ignition OFF.
- Depower the SRS. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING article.
- Disconnect: Passenger Seat Side Air Bag C313.
- Disconnect: Passenger Seat Control Switch C330.
- Connect the battery ground cable. Refer to BATTERY, MOUNTING & CABLES -- FUSION, MILAN & MKZ article.
- Measure the voltage between passenger seat control switch C330-5, circuit SBB31 (WH/RD), harness side and ground.
  
  Fig 1: Measuring Voltage Between Passenger Seat Control Switch C330-5, Circuit SBB31 (WH/RD), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
1. Yes : GO to D2 .
2. No : VERIFY Battery Junction Box (BJB) fuse 31 (30A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the SYSTEM WIRING DIAGRAMS article to identify the possible causes of the circuit short. TEST the system for normal operation.
  DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM -- FUSION, MILAN & MKZ article.
D2 CHECK FOR GROUND TO THE SEAT CONTROL SWITCH
- Measure the resistance between passenger seat control switch C330-3, circuit GD139 (BK/YE), harness side and ground.
  
  Fig 2: Measuring Resistance Between Passenger Seat Control Switch C330-3, Circuit GD139 (BK/YE), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
1. Yes : INSTALL a new passenger seat control switch. REFER to SEAT CONTROL SWITCH in this service information. TEST the system for normal operation.
  DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM -- FUSION, MILAN & MKZ article.
2. No : REPAIR the circuit. TEST the system for normal operation.
  DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM -- FUSION, MILAN & MKZ article.