Pinpoint Test H: The Power Seat Does Not Move Horizontally/Vertically/Recline - Passenger

Seats

Pinpoint Tests

Pinpoint Test H: The Power Seat Does Not Move Horizontally/Vertically/Recline - Passenger

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

Normal Operation

The passenger seat control switch is powered by battery voltage on circuit SBB61 (GY/RD) and is supplied ground on circuit GD145 (BK/BU). When pressed, the seat control switch supplies voltage and ground to a power seat track motor or power recliner motor to move the seat or backrest. When pressed in the opposite direction, the seat control switch reverses the polarity to the same power seat track motor or power recliner motor, which moves the seat or backrest in the opposite direction. There are 3 power 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 power recliner mechanism to move the seat backrest forward and rearward. If a new seat track motor needs to be installed, it is necessary to install an entire power seat track. The power recline motor is serviced separately.

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

PINPOINT TEST H: THE POWER SEAT DOES NOT MOVE HORIZONTALLY/VERTICALLY/RECLINE - PASSENGER

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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H1 CHECK THE HORIZONTAL MOTOR FOR CORRECT OPERATION

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

Yes
GO to H2.

No
GO to H3.

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H2 CHECK THE RECLINER MOTOR FOR CORRECT OPERATION

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

Yes
GO to H6.

No
GO to H13.

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H3 CHECK FOR VOLTAGE TO THE PASSENGER SEAT HORIZONTAL MOTOR

- Ignition OFF.
- Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Restraint Systems.
- Disconnect: Passenger Seat Side Air Bag C327.
- Disconnect: Passenger Seat Horizontal Motor C332.
- 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 passenger seat horizontal motor C332-1, circuit CPS38 (GN/BU), harness side and C332-2, circuit CPS33 (WH), harness side, while pushing the passenger 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 seat track assembly. REFER to Seat Track Seat Track. TEST the system for normal operation.

DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C327.

REPOWER the SRS. REFER to Restraint Systems.

No
GO to H4.

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H4 CHECK CIRCUIT CPS38 (GN/BU) FOR AN OPEN

- Disconnect: Passenger Seat Control Switch C3026.
- Measure the resistance between passenger seat control switch C3026-9, circuit CPS38 (GN/BU), harness side and passenger seat horizontal motor C332-1, circuit CPS38 (GN/BU), harness side.

- Is the resistance less than 5 ohms?

Yes
GO to H5.

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

DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C327.

REPOWER the SRS. REFER to Restraint Systems.

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H5 CHECK CIRCUIT CPS33 (WH) FOR AN OPEN

- Measure the resistance between passenger seat control switch C3026-4, circuit CPS33 (WH), harness side and passenger seat horizontal motor C332-2, circuit CPS33 (WH), harness side.

- Is the resistance 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 passenger seat side air bag module C327.

REPOWER the SRS. REFER to Restraint Systems.

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

DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C327.

REPOWER the SRS. REFER to Restraint Systems.

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H6 DETERMINE THE SEAT HEIGHT ADJUST FAILURE

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

Yes
If only the front height adjust motor operates, GO to H7.

If only the rear height adjust motor operates, GO to H10.

No
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 passenger seat side air bag module C327.

REPOWER the SRS. REFER to Restraint Systems.

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H7 CHECK FOR VOLTAGE TO THE PASSENGER SEAT REAR HEIGHT MOTOR

- Ignition OFF.
- Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Restraint Systems.
- Disconnect: Passenger Seat Side Air Bag C327.
- Disconnect: Passenger Seat Rear Height Motor C3075.
- 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 passenger seat rear height motor C3075-2, circuit CPS36 (YE/GY), harness side and C3075-1, circuit CPS37 (WH/BU), harness side, while depressing the rear height adjust switch 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 seat track assembly. REFER to Seat Track Seat Track. TEST the system for normal operation.

DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C327.

REPOWER the SRS. REFER to Restraint Systems.

No
GO to H8.

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H8 CHECK CIRCUIT CPS36 (YE/GY) FOR AN OPEN

- Disconnect: Passenger Seat Control Switch C3026.
- Measure the resistance between passenger seat control switch C3026-1, circuit CPS36 (YE/GY), harness side and passenger seat rear height motor C3075-2, circuit CPS36 (YE/GY), harness side.

- Is the resistance less than 5 ohms?

Yes
GO to H9.

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

DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C327.

REPOWER the SRS. REFER to Restraint Systems.

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H9 CHECK CIRCUIT CPS37 (WH/BU) FOR AN OPEN

- Measure the resistance between passenger seat control switch C3026-12, circuit CPS37 (WH/BU), harness side and passenger seat rear height motor C3075-1, circuit CPS37 (WH/BU), 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 seat track assembly. REFER to Seat Track Seat Track. TEST the system for normal operation.

DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C327.

REPOWER the SRS. REFER to Restraint Systems.

No
GO to H11.

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H11 CHECK CIRCUIT CPS34 (GY/BU) FOR AN OPEN

- Disconnect: Passenger Seat Control Switch C3026.
- Measure the resistance between passenger seat control switch C3026-2, circuit CPS34 (GY/BU), harness side and passenger seat front height motor C3074-2, circuit CPS34 (GY/BU), harness side.

- Is the resistance less than 5 ohms?

Yes
GO to H12.

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

DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C327.

REPOWER the SRS. REFER to Restraint Systems.

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H12 CHECK CIRCUIT CPS35 (VT/GN) FOR AN OPEN

- Measure the resistance between passenger seat control switch C3026-6, circuit CPS35 (VT/GN) harness side, and passenger seat front height motor C3074-1, circuit CPS35 (VT/GN), 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 seat recliner motor. REFER to Seat Recliner Motor Seat Recliner Motor. TEST the system for normal operation.

DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C327.

REPOWER the SRS. REFER to Restraint Systems.

No
GO to H14.

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H14 CHECK CIRCUIT CPS39 (GY/YE) FOR AN OPEN

- Disconnect: Passenger Seat Control Switch C3026.
- Measure the resistance between passenger seat control switch C3026-11, circuit CPS39 (GY/YE), harness side and passenger seat recliner motor C338-2, circuit CPS39 (GY/YE), harness side.

- Is the resistance less than 5 ohms?

Yes
GO to H15.

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

DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C327.

REPOWER the SRS. REFER to Restraint Systems.

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H15 CHECK CIRCUIT CPS40 (VT/GY) FOR AN OPEN

- Measure the resistance between passenger seat control switch C3026-8, circuit CPS40 (VT/GY) harness side, and passenger seat recliner motor C338-1, circuit CPS40 (VT/GY), harness side.

- Is the resistance less than 5 ohms between the passenger seat recliner motor and the passenger seat control switch?

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 passenger seat side air bag module C327.

REPOWER the SRS. REFER to Restraint Systems.

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

DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C327.

REPOWER the SRS. REFER to Restraint Systems.

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