Pinpoint Test O: The Power Lumbar is Inoperative - Driver

Seats

Pinpoint Tests

Pinpoint Test O: The Power Lumbar is Inoperative - Driver

Refer to Wiring Diagram Set 123, Memory Seats for schematic and connector information. Diagrams By Number

Normal Operation

The seat control switch is powered by battery voltage on circuit SBP12 (GN/RD) and is supplied ground on circuit GD133 (BK). When the lumbar knob on the seat control switch is pressed, voltage and ground are supplied to the power lumbar motor. When pressing the lumbar knob in the opposite direction, the seat control switch reverses the polarity to the power lumbar motor, which moves the lumbar mechanism in the opposite direction.

This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Seat control switch
- Power lumbar motor assembly



PINPOINT TEST O: THE POWER LUMBAR IS INOPERATIVE - DRIVER

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.

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O1 CHECK CIRCUIT SBP12 (GN/RD) FOR AN OPEN


- Ignition OFF.
- Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Restraint Systems.
- Disconnect: Driver Seat Side Air Bag C328.
- Disconnect: Seat Control Switch C3016.
- 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. Refer to Battery.
- Measure the voltage between seat control switch C3016-5, circuit SBP12 (GN/RD), harness side and ground.




- 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 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 seat side air bag module C328.

REPOWER the SRS. REFER to Restraint Systems.

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O2 CHECK CIRCUIT GD133 (BK) FOR AN OPEN


- Measure the resistance between seat control switch C3016-3, circuit GD133 (BK), harness side and ground.




- 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 Restraint Systems.

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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.




- 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 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 Restraint Systems.

No
GO to O4.

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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.




- 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 Restraint Systems.

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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.




- Are the resistances less than 5 ohms?

Yes
INSTALL a new seat control switch. REFER to Seat Control Switch - Front 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 Restraint Systems.

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 Restraint Systems.

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