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Pinpoint Test T: The Power Lumbar Is Inoperative - With Massage




Seating

Pinpoint Test T: The Power Lumbar Is Inoperative - With Massage

Refer to Wiring Diagram Set 120, Power Seats for schematic and connector information. Diagrams By Number

Normal Operation

The lumbar control module is supplied battery voltage when the engine is running and ground. A momentary voltage signal is supplied from the seat control switch activating the lumbar control module. Voltage and ground are then supplied to the lumbar pump. Air pressure is then directed through a hose attached from the pump to the lumbar control module.

This pinpoint test is intended to diagnose the following:

- Fuse

- Wiring, terminals or connectors

- Seat control switch

- Power lumbar assembly with massage

PINPOINT TEST T : THE POWER LUMBAR IS INOPERATIVE - WITH MASSAGE

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.

T1 CHECK THE POWER SEAT TRACK OPERATION

- Operate the power seat track.

Does the power seat track operate?

Yes
GO to T2.

No
GO to the appropriate power seat is inoperative test or memory seat test. GO to Symptom Chart or Driver Seat Module (DSM) DTC Chart. Symptom Related Diagnostic Procedures Seats

T2 CHECK THE SEAT CONTROL SWITCH

- Ignition OFF.

- Depower the SRS (Supplemental Restraint System). Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Restraints and Safety Systems &/or Air Bag Systems.

- Disconnect: Driver Seat Side Air Bag C3051 or Passenger Seat Side Air Bag C339.

- Disconnect: Driver Seat Safety Belt Buckle Pretensioner C3065 or Passenger Seat Safety Belt Buckle Pretensioner C3066.

- Disconnect: Driver Seat Control Switch C3387A or Passenger Seat Control Switch C3388A.

- Disconnect: Driver Seat Control Switch C3387B or Passenger Seat Control Switch C3388B.

- Check the seat control switch.

Is the seat control switch OK?

Yes
GO to T3.

No
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 safety belt buckle pretensioner C3065 or passenger safety belt buckle pretensioner C3066.

CONNECT driver seat side air bag module C3051 or passenger seat side air bag module C339.

REPOWER the SRS (Supplemental Restraint System). REFER to Restraints and Safety Systems &/or Air Bag Systems.

T3 CHECK FOR VOLTAGE TO THE LUMBAR CONTROL MODULE

- Remove the front seat backrest. Refer to Seat Backrest- Front .

- Disengage the backrest cover lower J-clips and route the wire harness(es) and air hoses out of the hole(s) in the backrest cover.





- On each side, separate the backrest cover clip and hook-and-loop strips.





- NOTE: Passenger seat shown, driver similar.

Access the lumbar control module electrical connectors in the seat backrest.
- NOTICE: Use care when separating the backrest cover from the hook-and-loop strip, or the hook-and-loop strip can be torn from the backrest foam pad.

If necessary, separate the hook-and-loop strips and invert the backrest cover up.





- Disconnect: Driver Seat Lumbar Control Module C3385A or Passenger Seat Lumbar Control Module C3386A.

- Disconnect: Driver Seat Lumbar Control Module C3385B or Passenger Seat Lumbar Control Module C3386B.

- Connect: Driver Seat Backrest-to-Cushion C3050 or Passenger Seat Backrest-to-Cushion C340.

- Position the seat in the vehicle.

- Connect: Driver Seat-to-Body C300 and C311 or Passenger Seat-to-body C312.

- 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.

Connect the battery ground cable.

- Start the engine.

- Measure the voltage between lumbar control module C3385A-1 (driver) or C3386A-1 (passenger), circuit SBX06 (GY/RD), harness side and ground.





Are the voltages greater than 10 volts?

Yes
GO to T4.

No
VERIFY SJB (Smart Junction Box) fuse 35 (10A) is OK. If OK, REPAIR the circuit(s). If fuse is not OK, Refer to the Wiring Diagrams to identify possible causes of the circuit short. TEST the system for normal operation. Diagrams By Number

DISCONNECT the battery ground cable.

CONNECT driver safety belt buckle pretensioner C3065 or passenger safety belt buckle pretensioner C3066.

CONNECT driver seat side air bag module C3051 or passenger seat side air bag module C339.

REPOWER the SRS (Supplemental Restraint System). REFER to Restraints and Safety Systems &/or Air Bag Systems.

T4 CHECK THE LUMBAR CONTROL MODULE GROUND CIRCUIT FOR AN OPEN

- Ignition OFF.

- Measure the resistance between lumbar control module C3385A-3 (driver) or C3386A-3 (passenger), circuit GD904 (BK/BU), harness side and ground.





Is the resistance less than 5 ohms?

Yes
GO to T5.

No
REPAIR the circuit(s). TEST the system for normal operation.

DISCONNECT the battery ground cable.

CONNECT driver safety belt buckle pretensioner C3065 or passenger safety belt buckle pretensioner C3066.

CONNECT driver seat side air bag module C3051 or passenger seat side air bag module C339.

REPOWER the SRS (Supplemental Restraint System). REFER to Restraints and Safety Systems &/or Air Bag Systems.

T5 CHECK THE MOTION/MASSAGE CIRCUIT FOR AN OPEN AND A SHORT TO GROUND

- For driver seat, measure the resistance between:
- seat control switch C3387B-3, circuit CPT36 (WH), harness side and lumbar control module C3385B-3, circuit CPT36 (WH), harness side.

- seat control switch C3387B-3, circuit CPT36 (WH), harness side and ground.






- For passenger seat, measure the resistance between:
- seat control switch C3388B-3, circuit CPT36 (BU/WH), harness side and lumbar control module C3386B-3, circuit CPT36 (WH), harness side.

- seat control switch C3388B-3, circuit CPT36 (BU/WH), harness side and ground.


Is the resistance less than 5 ohms between driver seat C3387B-3 and C3385B-3 or passenger seat C3388B-3 and C3386B-3, and greater than 10,000 ohms between driver seat C3387B-3 or passenger seat C3388B-3 and ground?

Yes
GO to T6.

No
REPAIR the circuit(s). TEST the system for normal operation.

DISCONNECT the battery ground cable.

CONNECT driver safety belt buckle pretensioner C3065 or passenger safety belt buckle pretensioner C3066.

CONNECT driver seat side air bag module C3051 or passenger seat side air bag module C339.

REPOWER the SRS (Supplemental Restraint System). REFER to Restraints and Safety Systems &/or Air Bag Systems.

T6 CHECK THE LUMBAR PUMP VOLTAGE CIRCUIT FOR AN OPEN AND A SHORT TO GROUND

- NOTE: Passenger seat shown, driver similar.

Access the lumbar pump electrical connectors from the back of the backrest.
- NOTICE: Use care when separating the backrest cover from the hook-and-loop strip, or the hook-and-loop strip can be torn from the backrest foam pad.

If necessary, separate the hook-and-loop strips and invert the backrest cover up.





- Disconnect: Driver Seat Lumbar Pump C3383 or Passenger Seat Lumbar Pump C3384.

- Measure the resistance between:
- lumbar control module C3385A-4 (driver) or C3386A-4 (passenger), circuit CPT05 (YE), harness side and lumbar pump C3383-1 (driver) or C3384-1 (passenger), circuit CPT05 (YE), harness side.

- lumbar control module C3385A-4 (driver) or C3386A-4 (passenger), circuit CPT05 (YE), harness side and ground.






Is the resistance less than 5 ohms between C3385A-4 (driver) or C3386A-4 (passenger) and C3383-1 (driver) or C3384-1 (passenger), and greater than 10,000 ohms between driver seat C3385A-4 or passenger seat C3386A-4 and ground?

Yes
GO to T7.

No
REPAIR the circuit. TEST the system for normal operation.

DISCONNECT the battery ground cable.

CONNECT driver safety belt buckle pretensioner C3065 or passenger safety belt buckle pretensioner C3066.

CONNECT driver seat side air bag module C3051 or passenger seat side air bag module C339.

REPOWER the SRS (Supplemental Restraint System). REFER to Restraints and Safety Systems &/or Air Bag Systems.

T7 CHECK THE LUMBAR PUMP GROUND CIRCUIT FOR AN OPEN

- Measure the resistance between lumbar control module C3385A-6 (driver) or C3386A-6 (passenger), circuit RPT05 (BU), harness side and lumbar pump C3383-2 (driver) or C3384-2 (passenger), circuit RPT05 (BU), harness side.





Is the resistance less than 5 ohms?

Yes
INSTALL a new power lumbar assembly. REFER to Lumbar Assembly - Power, with Massage . TEST the system for normal operation.

DISCONNECT the battery ground cable.

CONNECT driver safety belt buckle pretensioner C3065 or passenger safety belt buckle pretensioner C3066.

CONNECT driver seat side air bag module C3051 or passenger seat side air bag module C339.

REPOWER the SRS (Supplemental Restraint System). REFER to Restraints and Safety Systems &/or Air Bag Systems.

No
REPAIR the circuit. TEST the system for normal operation.

DISCONNECT the battery ground cable.

CONNECT driver safety belt buckle pretensioner C3065 or passenger safety belt buckle pretensioner C3066.

CONNECT driver seat side air bag module C3051 or passenger seat side air bag module C339.

REPOWER the SRS (Supplemental Restraint System). REFER to Restraints and Safety Systems &/or Air Bag Systems.

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