Pinpoint Test O: The Power Lumbar Is Inoperative - Driver

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: The air bag warning indicator illuminates when the correct Restraints Control Module (RCM) fuse is removed and the ignition is ON.

NOTE: The Supplemental Restraint System (SRS) must be fully operational and free of faults before releasing the vehicle to the customer.

O1 CHECK CIRCUIT SBP12 (GN/RD) FOR AN OPEN
- Ignition OFF.
- Depower the SRS . Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
- Disconnect: Driver Seat Side Air Bag C328.
- Disconnect: Seat Control Switch C3016.
- Connect the battery ground cable. Refer to BATTERY, MOUNTING AND CABLES .
- Measure the voltage between seat control switch C3016-5, circuit SBP12 (GN/RD), harness side and ground.
  
  Fig 1: Measuring Voltage Between Seat Control Switch C3016-5, Circuit SBP12 (GN/RD), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
- Yes: GO to O2 .
- No: VERIFY Smart Junction Box (SJB) fuse 12 (7.5A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the SYSTEM WIRING DIAGRAMS for Edge or SYSTEM WIRING DIAGRAMS for MKX to identify possible causes of the circuit short. TEST the system for normal operation.
  DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C328.
  
  REPOWER the SRS . REFER to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
O2 CHECK CIRCUIT GD133 (BK) FOR AN OPEN
- Measure the resistance between seat control switch C3016-3, circuit GD133 (BK), harness side and ground.
  
  Fig 2: Measuring Resistance Between Seat Control Switch C3016-3, Circuit GD133 (BK), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes: GO to O3 .
- No: REPAIR the circuit. TEST the system for normal operation.
  DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C328.
  
  REPOWER the SRS . REFER to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
O3 CHECK THE LUMBAR MOTOR
- Connect: Seat Control Switch C3016.
- Disconnect: Power Lumbar Motor C3215.
- While operating the seat control switch in both directions, measure the voltage between power lumbar motor C3215-1, circuit CPS18 (BN/GN), harness side and power lumbar motor C3215-2, circuit CPS19 (GY/VT), harness side.
  
  Fig 3: Measuring Voltage Between Power Lumbar Motor C3215-1, Circuit CPS18 (BN/GN) And Power Lumbar Motor C3215-2, Circuit CPS19 (GY/VT)
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts when the seat control switch is operated in both directions and 0 volt in the rest position?
- Yes: INSTALL a new power lumbar assembly. REFER to LUMBAR ASSEMBLY - POWER . TEST the system for normal operation.
  DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C328.
  
  REPOWER the SRS . REFER to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
- No: GO to O4 .
O4 CHECK CIRCUITS CPS19 (GY/VT) AND CPS18 (BN/GN) FOR A SHORT TO GROUND
- Disconnect: Seat Control Switch C3016.
- Measure the resistance between:
  - seat control switch C3016-10, circuit CPS18 (BN/GN), harness side and ground.
  - seat control switch C3016-7, circuit CPS19 (GY/VT), harness side and ground.
    
    Fig 4: Measuring Resistance Between Seat Control Switch C3016-10, Circuit CPS18 (BN/GN), Harness Side And Ground
    Courtesy of FORD MOTOR CO.
- Are the resistances greater than 10,000 ohms?
- Yes: GO to O5 .
- No: REPAIR the circuit. TEST the system for normal operation.
  DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C328.
  
  REPOWER the SRS . REFER to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
O5 CHECK CIRCUITS CPS19 (GY/VT) AND CPS18 (BN/GN) FOR AN OPEN
- Measure the resistance between:
  - seat control switch C3016-10, circuit CPS18 (BN/GN), harness side and power lumbar motor C3215-1, circuit CPS18 (BN/GN), harness side.
  - seat control switch C3016-7, circuit CPS19 (GY/VT), harness side and power lumbar motor C3215-2, circuit CPS19 (GY/VT), harness side.
    
    Fig 5: Measuring Resistance Between Seat Control Switch C3016-10 And Power Lumbar Motor C3215-1
    Courtesy of FORD MOTOR CO.
- Are the resistances less than 5 ohms?
- Yes: INSTALL a new seat control switch. REFER to SEAT CONTROL SWITCH - FRONT . TEST the system for normal operation.
  DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C328.
  
  REPOWER the SRS . REFER to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
- No: REPAIR the circuit. TEST the system for normal operation.
  DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C328.
  
  REPOWER the SRS . REFER to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .