Pinpoint Test C: The Power Seat Does Not Move Horizontally/Vertically - Driver, With Manual Recliner

Seats

Pinpoint Tests

Pinpoint Test C: The Power Seat Does Not Move Horizontally/Vertically - Driver, With Manual Recliner

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

Normal Operation

When the driver seat control switch is activated, voltage and ground is supplied to the applicable seat track motor to move the seat to the desired position. There are 3 seat track motors that combine to move the seat cushion horizontally (forward/rearward) and vertically (front up/down and rear up/down). If a new seat track motor needs to be installed, it is necessary to install an entire seat track assembly.

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

PINPOINT TEST C: THE POWER SEAT DOES NOT MOVE HORIZONTALLY/VERTICALLY - DRIVER, WITH MANUAL RECLINER

NOTE: If a seat equipped with a seat mounted side air bag is being repaired, the Supplemental Restraint System (SRS) must be depowered. Refer to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.

NOTE: The air bag warning lamp illuminates when the Restraints Control Module (RCM) fuse is removed and the ignition switch is ON. This is normal operation and does not indicate an SRS fault.

NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.

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C1 CHECK THE HORIZONTAL MOTOR FOR CORRECT OPERATION

- Operate the driver power seat forward and rearward.
- Will the seat move horizontally?

Yes
GO to C5.

No
GO to C2.

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C2 CHECK VOLTAGE TO THE HORIZONTAL MOTOR

- Ignition OFF.
- Depower the SRS. Refer to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
- Disconnect: Driver Seat Side Air Bag Module C3051.
- Disconnect: Driver Seat Horizontal Motor C362.

- 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, Mounting and Cables Battery Disconnect.

- NOTE: During the following step, the voltage being measured changes polarity dependent upon which direction the seat control switch is activated.

- Measure the voltage between driver seat horizontal motor C362-1, circuit CPS23 (GN/VT), harness side and C362-2, circuit CPS28 (GN), harness side, while pressing the driver seat control switch forward and rearward.

- 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 driver seat track assembly. REFER to Seat Track Seat Track. TEST the system for normal operation.

DISCONNECT the battery ground cable.

CONNECT driver seat side air bag module C3051.

REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.

No
GO to C3.

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C3 CHECK THE HORIZONTAL MOTOR CIRCUIT FOR AN OPEN

- Disconnect: Driver Seat Control Switch C360.
- Measure the resistance between driver seat control switch C360-3, circuit CPS23 (GN/VT), harness side and driver seat horizontal motor C362-1, circuit CPS23 (GN/VT), harness side.

- Is the resistance less than 5 ohms?

Yes
GO to C4.

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

DISCONNECT the battery ground cable.

CONNECT driver seat side air bag module C3051.

REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.

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C4 CHECK THE HORIZONTAL MOTOR CIRCUIT FOR AN OPEN

- Measure the resistance between driver seat control switch C360-6, circuit CPS28 (GN), harness side and driver seat horizontal motor C362-2, circuit CPS28 (GN), harness side.

- Is the resistance less than 5 ohms?

Yes
INSTALL a new driver seat control switch. REFER to Seat Control Switch Seat Control Switch. TEST the system for normal operation.

DISCONNECT the battery ground cable.

CONNECT driver seat side air bag module C3051.

REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.

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

DISCONNECT the battery ground cable.

CONNECT driver seat side air bag module C3051.

REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.

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C5 DETERMINE THE SEAT HEIGHT ADJUST FAILURE

- Operate the front and rear seat height adjustments.
- Are both front and rear seat height adjustments inoperative?

Yes
INSTALL a new driver seat control switch. REFER to Seat Control Switch Seat Control Switch. TEST the system for normal operation.

DISCONNECT the battery ground cable.

CONNECT driver seat side air bag module C3051.

REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.

No
If only front height adjust operates, GO to C6.

If only rear height adjust operates, GO to C9.

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C6 CHECK VOLTAGE TO THE REAR HEIGHT MOTOR

- Ignition OFF.
- Depower the SRS. Refer to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
- Disconnect: Driver Seat Side Air Bag Module C3051.
- Disconnect: Driver Seat Rear Height Motor C363.

- 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, Mounting and Cables Battery Disconnect.

- NOTE: During the following step, the voltage being measured changes polarity dependent upon which direction the seat control switch is activated.

- Measure the voltage between driver seat rear height motor C363-5, circuit CPS26 (YE/BU), harness side and C363-1, circuit CPS27 (BU/BN), harness side, while operating the seat control switch rear height adjust up and down.

- 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 driver seat track assembly. REFER to Seat Track Seat Track. TEST the system for normal operation.

DISCONNECT the battery ground cable.

CONNECT driver seat side air bag module C3051.

REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.

No
GO to C7.

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C7 CHECK THE REAR HEIGHT MOTOR CIRCUIT FOR AN OPEN

- Disconnect: Driver Seat Control Switch C360.
- Measure the resistance between driver seat control switch C360-5, circuit CPS27 (BU/BN), harness side and driver seat rear height motor C363-1, circuit CPS27 (BU/BN), harness side.

- Is the resistance less than 5 ohms?

Yes
GO to C8.

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

DISCONNECT the battery ground cable.

CONNECT driver seat side air bag module C3051.

REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.

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C8 CHECK THE REAR HEIGHT MOTOR CIRCUIT FOR AN OPEN

- Measure the resistance between driver seat control switch C360-7, circuit CPS26 (YE/BU), harness side and driver seat rear height motor C363-5, circuit CPS26 (YE/BU), harness side.

- Is the resistance less than 5 ohms?

Yes
INSTALL a new driver seat control switch. REFER to Seat Control Switch Seat Control Switch. TEST the system for normal operation.

DISCONNECT the battery ground cable.

CONNECT driver seat side air bag module C3051.

REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.

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

DISCONNECT the battery ground cable.

CONNECT driver seat side air bag module C3051.

REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.

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C9 CHECK VOLTAGE TO THE FRONT HEIGHT MOTOR

- Ignition OFF.
- Depower the SRS. Refer to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
- Disconnect: Driver Seat Side Air Bag Module C3051.
- Disconnect: Driver Seat Front Height Motor C382.

- 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, Mounting and Cables Battery Disconnect.

- NOTE: During the following step, the voltage being measured changes polarity dependent upon which direction the seat control switch is activated.

- Measure the voltage between driver seat front height motor C382-1, circuit CPS24 (GY), harness side and C382-2, circuit CPS25 (WH/VT), while operating the seat control switch front height adjust up and down.

- 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 driver seat track assembly. REFER to Seat Track Seat Track. TEST the system for normal operation.

DISCONNECT the battery ground cable.

CONNECT driver seat side air bag module C3051.

REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.

No
GO to C10.

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C10 CHECK THE FRONT HEIGHT MOTOR CIRCUIT FOR AN OPEN

- Disconnect: Driver Seat Control Switch C360.
- Measure the resistance between driver seat control switch C360-1, circuit CPS25 (WH/VT), harness side and driver seat front height motor C382-2, circuit CPS25 (WH/VT), harness side.

- Is the resistance less than 5 ohms?

Yes
GO to C11.

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

DISCONNECT the battery ground cable.

CONNECT driver seat side air bag module C3051.

REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.

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C11 CHECK THE FRONT HEIGHT MOTOR CIRCUIT FOR AN OPEN

- Measure the resistance between driver seat control switch C360-8, circuit CPS24 (GY) harness side, and driver seat front height motor C382-1, circuit CPS24 (GY), harness side.