Pinpoint Test O : The Power Lumbar Is Inoperative - Driver
WARNING: This page is about a different car, the 2016 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
The airbag warning indicator illuminates when the correct RCM fuse is removed and the ignition is ON.
NOTE:
The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
- O1 CHECK OTHER SEAT CONTROL SWITCH FEATURES FOR CORRECT OPERATION
- Operate the seat horizontally and vertically.
Does the seat operate horizontally and vertically?
Yes GO to O2. No For seat with memory, GO to Pinpoint Test L to diagnose the inoperative seat.For seat without memory, GO to Pinpoint Test A to diagnose the inoperative seat. - O2 CHECK FOR VOLTAGE TO THE LUMBAR MOTOR
- Ignition OFF.
- Depower the SRS. Refer to SRS Depowering and Repowering in the General Procedures portion of Supplemental Restraint System .
- Disconnect: Driver Seat Side Airbag C3051.
- Disconnect: Power Lumbar Motor C3215.
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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 Battery, Mounting and Cables .
- While toggling the power lumbar switch, measure the voltage between power lumbar motor C3215-B , circuit CPS18 (BN/GN), harness side and power lumbar motor C3215-A , circuit CPS19 (GY/VT), harness side.
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 . TEST the system for normal operation.DISCONNECT the battery ground cable.CONNECT driver seat side airbag C3051.REPOWER the SRS. REFER to Supplemental Restraint System . No GO to O3. - O3 CHECK THE LUMBAR MOTOR CIRCUITS FOR AN OPEN
- Disconnect: Seat Control Switch C3016.
- Measure the resistance between:
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 airbag C3051.REPOWER the SRS. REFER to Supplemental Restraint System . No REPAIR the circuit(s). TEST the system for normal operation.DISCONNECT the battery ground cable.CONNECT driver seat side airbag C3051.REPOWER the SRS. REFER to Supplemental Restraint System .