Pinpoint Test I: The Power Lumbar Is Inoperative - Passenger

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.

I1 CHECK FOR VOLTAGE TO THE LUMBAR MOTOR
- Ignition OFF.
- Depower the SRS . Refer to Supplemental Restraint System (SRS) Depowering and Repowering .
- Disconnect: Passenger Seat Side Air Bag C337.
- Disconnect: Passenger Safety Belt Buckle C3066.
- Disconnect: Passenger Seat Power Lumbar Motor C3216.
- WARNING: Make sure no one is in the vehicle and there is nothing blocking or placed in front of any airbag 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 Removal and Installation .
- NOTE: During the following step, the voltage being measured changes polarity dependent upon which direction the seat control switch is activated.
  
  Measure voltage between power lumbar motor C3216-B , circuit CPS18 (BN/GN), harness side and power lumbar motor C3216-A , circuit CPS19 (GY/VT), harness side.
  
  Fig 1: Measuring Voltage Between Power Lumbar Motor C3216-B, Circuit CPS18 (BN/GN) And Power Lumbar Motor C3216-A, Circuit CPS19 (GY/VT)
  Courtesy of FORD MOTOR CO.
- Operate the seat control switch in both directions.
Is the voltage greater than 11 volts in both directions?
- Yes : INSTALL a new power lumbar assembly. REFER to LUMBAR ASSEMBLY - POWER in this article. TEST the system for normal operation.
  DISCONNECT the battery ground cable. CONNECT passenger seat side air bag C337 and passenger safety belt buckle C3066. REPOWER the SRS . REFER to Supplemental Restraint System (SRS) Depowering and Repowering .
- No : GO to I2 .
I2 CHECK THE LUMBAR MOTOR CIRCUITS FOR AN OPEN
- Disconnect: Passenger Seat Control Switch C330.
- Measure the resistance between:
  - seat control switch C330-10 , circuit CPS20 (VT), harness side and power lumbar motor C3216-B , circuit CPS18 (BN/GN), harness side.
  - seat control switch C330-7 , circuit CPS21 (WH/OG), harness side and power lumbar motor C3216-A , circuit CPS19 (GY/VT), harness side.
    
    Fig 2: Measuring Resistance Between Seat Control Switch C330-7, Circuit CPS21 (WH/OG) And Power Lumbar Motor C3216-A, Circuit CPS19 (GY/VT)
    Courtesy of FORD MOTOR CO.
Are the resistances less than 3 ohms?
- Yes : INSTALL a new seat control switch. REFER to SEAT CONTROL SWITCH - FRONT in this article. TEST the system for normal operation.
  DISCONNECT the battery ground cable. CONNECT passenger seat side air bag C337 and passenger safety belt buckle C3066. 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 passenger seat side air bag C337 and passenger safety belt buckle C3066. REPOWER the SRS . REFER to Supplemental Restraint System (SRS) Depowering and Repowering .