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Pinpoint Test U: The Power Lumbar Does Not Operate Correctly - With Massage




Seating

Pinpoint Test U: The Power Lumbar Does Not Operate Correctly - With Massage

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

Normal Operation

The lumbar control module receives a momentary voltage signal from the seat control switch activating the lumbar control module. The module identifies the request and air pressure is then directed through hoses to the appropriate bladder from the lumbar control module.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors

- Seat control switch

- Power lumbar assembly with massage

- Massage seat cushion

PINPOINT TEST U : THE POWER LUMBAR DOES NOT OPERATE CORRECTLY - 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.

U1 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 U2.

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.

U2 CHECK THE SYSTEM FOR LEAKS

- Access the cushion and backrest bladders. Refer to Lumbar Assembly- Power, with Massage and Seat Cushion- Front, Massage .

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

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

- 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.

- NOTE: Cushion-to-backrest hose connections shown.





- NOTE: Cushion bladder and hoses shown.
Operate the power lumbar/massage seat and check for hose, hose connection, backrest bladder and cushion bladder leaks.






Are there any leaks?

Yes
If the cushion bladder or any associated hoses or connections leak, INSTALL a new cushion bladder. REFER to Seat Cushion - Front, Massage . TEST the system for normal operation.

If the backrest bladder or any associated hoses or connections leak, INSTALL a new power lumbar assembly. REFER to Lumbar Assembly - Power, with Massage .

TEST the system for correct 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
GO to U3.

U3 CHECK THE MOTION/MASSAGE CIRCUIT FOR AN OPEN AND A SHORT TO GROUND

- Ignition OFF.

- 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.





- 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.

- 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 U4.

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.

U4 CHECK THE LUMBAR DOWN CIRCUIT FOR AN OPEN AND A SHORT TO GROUND

- For driver seat, measure the resistance between:
- seat control switch C3387B-8, circuit CPS64 (BN/VT), harness side and lumbar control module C3385B-8, circuit CPS64 (BN/VT), harness side.

- seat control switch C3387B-8, circuit CPS64 (BN/VT), harness side and ground.






- For passenger seat, measure the resistance between:
- seat control switch C3388B-8, circuit CPS88 (GY/OG), harness side and lumbar control module C3386B-8, circuit CPS64 (BN/VT), harness side.

- seat control switch C3388B-8, circuit CPS88 (GY/OG), harness side and ground.


Is the resistance less than 5 ohms between driver seat C3387B-8 and C3385B-8 or passenger seat C3388B-8 and C3386B-8, and greater than 10,000 ohms between driver seat C3387B-8 or passenger seat C3388B-8 and ground?

Yes
GO to U5.

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.

U5 CHECK THE LUMBAR UP CIRCUIT FOR AN OPEN AND A SHORT TO GROUND

- For driver seat, measure the resistance between:
- seat control switch C3387B-4, circuit CPS65 (WH/GN), harness side and lumbar control module C3385B-4, circuit CPS65 (WH/GN), harness side.

- seat control switch C3387B-4, circuit CPS65 (WH/GN), harness side and ground.






- For passenger seat, measure the resistance between:
- seat control switch C3388B-4, circuit CPS89 (BU/BN), harness side and lumbar control module C3386B-4, circuit CPS65 (WH/GN), harness side.

- seat control switch C3388B-4, circuit CPS89 (BU/BN), harness side and ground.


Is the resistance less than 5 ohms between driver seat C3387B-4 and C3385B-4 or passenger seat C3388B-4 and C3386B-4, and greater than 10,000 ohms between driver seat C3387B-4 or passenger seat C3388B-4 and ground?

Yes
GO to U6.

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.

U6 CHECK THE LUMBAR DEFLATE CIRCUIT FOR AN OPEN AND A SHORT TO GROUND

- For driver seat, measure the resistance between:
- seat control switch C3387B-1, circuit CPS18 (BN/GN), harness side and lumbar control module C3385B-1, circuit CPS18 (BN/GN), harness side.

- seat control switch C3387B-1, circuit CPS18 (BN/GN), harness side and ground.






- For passenger seat, measure the resistance between:
- seat control switch C3388B-1, circuit CPS20 (VT), harness side and lumbar control module C3386B-1, circuit CPS18 (BN/GN), harness side.

- seat control switch C3388B-1, circuit CPS20 (VT), harness side and ground.


Is the resistance less than 5 ohms between driver seat C3387B-1 and C3385B-1 or passenger seat C3388B-1 and C3386B-1, and greater than 10,000 ohms between driver seat C3387B-1 or passenger seat C3388B-1 and ground?

Yes
GO to U7.

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.

U7 CHECK THE LUMBAR INFLATE CIRCUIT FOR AN OPEN AND A SHORT TO GROUND

- For driver seat, measure the resistance between:
- seat control switch C3387B-5, circuit CPS19 (GY/VT), harness side and lumbar control module C3385B-5, circuit CPS19 (GY/VT), harness side.

- seat control switch C3387B-5, circuit CPS19 (GY/VT), harness side and ground.






- For passenger seat, measure the resistance between:
- seat control switch C3388B-5, circuit CPS21 (WH/OG), harness side and lumbar control module C3386B-5, circuit CPS19 (GY/VT), harness side.

- seat control switch C3388B-5, circuit CPS21 (WH/OG), harness side and ground.


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

Yes
INSTALL a new backrest bladder. REFER to Lumbar Assembly - Power, with Massage . TEST the system for correct 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(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.

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