Pinpoint Test F: The Power Seat Does Not Move Horizontally/Vertically/Recline - Driver Without Memory

Seats

Pinpoint Tests

Pinpoint Test F: The Power Seat Does Not Move Horizontally/Vertically/Recline - Driver Without Memory

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

Normal Operation

The driver seat control switch is supplied voltage and ground. 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). There is an additional motor in the seat recliner mechanism to move the seat backrest forward and rearward. If a new motor on the seat track needs to be installed, it is necessary to install an entire seat track assembly.

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

PINPOINT TEST F: THE POWER SEAT DOES NOT MOVE HORIZONTALLY/VERTICALLY/RECLINE - DRIVER, WITHOUT MEMORY

NOTICE: Use the correct probe adapter(s) from the Flex Probe Kit when taking measurements. Failure to use the correct probe adapter(s) may damage the connector.

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F1 CHECK THE HORIZONTAL MOTOR FOR CORRECT OPERATION

NOTE: If a seat equipped with a seat mounted side air bag is being serviced, 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.

- Ignition OFF.

- 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.

- For vehicles equipped with seat side air bags, carry out the following:
- Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
- Disconnect the driver seat side air bag module C3051.
- Connect the battery ground cable. Refer to Battery, Mounting and Cables Battery Disconnect / Connect.
- Operate the driver power seat forward and rearward.
- Will the seat move horizontally?

Yes
GO to F2.

No
GO to F3.

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F2 CHECK THE RECLINER MOTOR FOR CORRECT OPERATION

- Recline the driver backrest forward and rearward.
- Will the seat backrest recline forward and rearward?

Yes
GO to F6.

No
GO to F13.

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F3 CHECK VOLTAGE TO THE HORIZONTAL MOTOR

- Ignition OFF.
- Disconnect: Driver Seat Horizontal Motor C362.

- 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 one direction, - 10V when the seat control switch is operated in the opposite direction, and 0 volt in the rest position?

Yes
INSTALL a new driver seat track assembly. REFER to Seat Cushion - Front, Bucket Seat Bucket Seat. TEST the system for normal operation.

For vehicles equipped with seat side air bags, 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 F4.

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F4 CHECK THE HORIZONTAL MOTOR CIRCUIT FOR AN OPEN

- Disconnect: Driver Seat Control Switch C369.
- Measure the resistance between driver seat control switch C369-4, 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 F5.

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

For vehicles equipped with seat side air bags, 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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F5 CHECK THE HORIZONTAL MOTOR CIRCUIT FOR AN OPEN

- Measure the resistance between driver seat control switch C369-9, 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 Backrest - Front, Bucket Seat Bucket Seat. TEST the system for normal operation.

For vehicles equipped with seat side air bags, 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.

For vehicles equipped with seat side air bags, 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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F6 DETERMINE THE SEAT HEIGHT ADJUST FAILURE

- Operate the front and rear seat height adjustments.
- Does the seat front and rear height adjust up and down?

Yes
If only front height adjust operates, GO to F7.

If only rear height adjust operates, GO to F10.

No
INSTALL a new driver seat control switch. REFER to Seat Backrest - Front, Bucket Seat Bucket Seat. TEST the system for normal operation.

For vehicles equipped with seat side air bags, 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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F7 CHECK VOLTAGE TO THE REAR HEIGHT MOTOR

- Disconnect: Driver Rear Height Motor C363.

- 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 pressing the seat control switch rear height adjust up and down.

- Is the voltage greater than 10 volts when the seat control switch is operated and 0 volt in the rest position?

Yes
INSTALL a new driver seat track assembly. REFER to Seat Cushion - Front, Bucket Seat Bucket Seat. TEST the system for normal operation.

For vehicles equipped with seat side air bags, 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 F8.

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F8 CHECK THE REAR SEAT HEIGHT MOTOR CIRCUIT FOR AN OPEN

- Disconnect: Driver Seat Control Switch C369.
- Measure the resistance between driver seat control switch C369-1, 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 F9.

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

For vehicles equipped with seat side air bags, 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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F9 CHECK THE REAR SEAT HEIGHT MOTOR CIRCUIT FOR AN OPEN

- Measure the resistance between driver seat control switch C369-12, circuit CPS26 (YE/BU), harness side and driver seat rear height motor C363-5, circuit CPS26 (YE/BU), harness side.

- Is the voltage greater than 10 volts when the seat control switch is operated and 0 volt in the rest position?

Yes
INSTALL a new seat track assembly. REFER to Seat Cushion - Front, Bucket Seat Bucket Seat. TEST the system for normal operation.

For vehicles equipped with seat side air bags, 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 F11.

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F11 CHECK THE FRONT HEIGHT MOTOR CIRCUIT FOR AN OPEN

- Disconnect: Driver Seat Control Switch C369.
- Measure the resistance between driver seat control switch C369-6, circuit CPS24 (GY), harness side and front height motor C382-1, circuit CPS24 (GY), harness side.

- Is the resistance less than 5 ohms?

Yes
GO to F12.

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

For vehicles equipped with seat side air bags, 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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F12 CHECK THE FRONT HEIGHT MOTOR CIRCUIT FOR AN OPEN

- Measure the resistance between driver seat control switch C369-2, circuit CPS25 (WH/VT), harness side, and front height motor C382-2, circuit CPS25 (WH/VT), harness side.

- Is the voltage greater than 10 volts when the seat control switch is operated and 0 volt in the rest position?

Yes
INSTALL a new seat recliner motor. REFER to Seat Backrest - Front, Bucket Seat Bucket Seat. TEST the system for normal operation.

For vehicles equipped with seat side air bags, 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 F14.

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F14 CHECK THE RECLINER MOTOR CIRCUIT FOR AN OPEN

- Disconnect: Driver Seat Control Switch C369.
- Measure the resistance between driver seat control switch C369-11, circuit CPS29 (WH/BN), harness side and seat recliner motor C3187-1, circuit CPS07 (GY/BN), harness side.

- Is the resistance less than 5 ohms?

Yes
GO to F15.

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

For vehicles equipped with seat side air bags, 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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F15 CHECK THE RECLINER MOTOR CIRCUIT FOR AN OPEN

- Measure the resistance between driver seat control switch C369-8, circuit CPS30 (VT/BN) harness side, and seat recliner motor C3187-3, circuit CPS08 (VT/OG), harness side.