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

Seats

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

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

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 track

- Seat control switch

- Power seat motor

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

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 Restraints and Safety Systems &/or Air Bag Systems.

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 (Supplemental Restraint System) fault.

NOTE: The SRS (Supplemental Restraint System) must be fully operational and free of faults before releasing the vehicle to the customer.

E1 CHECK THE HORIZONTAL MOTOR FOR CORRECT OPERATION

- Operate the driver seat forward and rearward.

Will the seat move horizontally?

Yes
GO to E5.

No
GO to E2.

E2 CHECK FOR VOLTAGE TO THE DRIVER SEAT HORIZONTAL MOTOR

- 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 C328.

- 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.

- 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 CPS28 (GN), harness side and C362-2, circuit CPS23 (GN/VT), harness side, while pushing the driver seat control switch forward and rearward.

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 Track . TEST the system for normal operation.

DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C328.

REPOWER the SRS (Supplemental Restraint System). REFER to Restraints and Safety Systems &/or Air Bag Systems.

No
GO to E3.

E3 CHECK THE HORIZONTAL MOTOR CIRCUIT FOR AN OPEN

- Disconnect: Driver Seat Control Switch C352.

- Measure the resistance between driver seat control switch C352-6, circuit CPS28 (GN), harness side and driver seat horizontal motor C362-1, circuit CPS28 (GN), harness side.

Is the resistance less than 5 ohms?

Yes
GO to E4.

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 (Supplemental Restraint System). REFER to Restraints and Safety Systems &/or Air Bag Systems.

E4 CHECK THE HORIZONTAL MOTOR CIRCUIT FOR AN OPEN

- Measure the resistance between driver seat control switch C352-3, circuit CPS23 (GN/VT), harness side and driver seat horizontal motor C362-2, circuit CPS23 (GN/VT), harness side.

Is the resistance less than 5 ohms?

Yes
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 seat side air bag module C328.

REPOWER the SRS (Supplemental Restraint System). REFER to Restraints and Safety Systems &/or Air Bag 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 (Supplemental Restraint System). REFER to Restraints and Safety Systems &/or Air Bag Systems.

E5 DETERMINE THE SEAT HEIGHT ADJUST FAILURE

- Operate the seat front and rear height adjustments.

Are both front and rear seat height adjustments inoperative?

Yes
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 seat side air bag module C328.

REPOWER the SRS (Supplemental Restraint System). REFER to Restraints and Safety Systems &/or Air Bag Systems.

No
If only the front height adjust motor operates, GO to E6.

If only the rear height adjust motor operates, GO to E9.

E6 CHECK FOR VOLTAGE TO THE REAR HEIGHT MOTOR

- 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 C328.

- 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.

- 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 C363-2, circuit CPS26 (YE/BU), harness side and C363-1, circuit CPS27 (BU/BN), harness side, while pressing the rear height adjust switch 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 seat track assembly. REFER to Seat Track . TEST the system for normal operation.

DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C328.

REPOWER the SRS (Supplemental Restraint System). REFER to Restraints and Safety Systems &/or Air Bag Systems.

No
GO to E7.

E7 CHECK THE REAR HEIGHT MOTOR CIRCUIT FOR AN OPEN

- Disconnect: Driver Seat Control Switch C352.

- Measure the resistance between driver seat control switch C352-7, circuit CPS26 (YE/BU), harness side and driver seat rear height motor C363-2, circuit CPS26 (YE/BU), harness side.

Is the resistance less than 5 ohms?

Yes
GO to E8.

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 (Supplemental Restraint System). REFER to Restraints and Safety Systems &/or Air Bag Systems.

E8 CHECK THE REAR HEIGHT MOTOR CIRCUIT FOR AN OPEN

- Measure the resistance between driver seat control switch C352-5, 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
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 seat side air bag module C328.

REPOWER the SRS (Supplemental Restraint System). REFER to Restraints and Safety Systems &/or Air Bag 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 (Supplemental Restraint System). REFER to Restraints and Safety Systems &/or Air Bag Systems.

E9 CHECK FOR VOLTAGE TO THE DRIVER SEAT FRONT HEIGHT MOTOR

- 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 C328.

- 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.

- 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 CPS25 (WH/VT), harness side and C382-2, circuit CPS24 (GY), while pressing the front height adjust switch 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 seat track assembly. REFER to Seat Track . TEST the system for normal operation.

DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C328.

REPOWER the SRS (Supplemental Restraint System). REFER to Restraints and Safety Systems &/or Air Bag Systems.

No
GO to E10.

E10 CHECK THE FRONT HEIGHT MOTOR CIRCUIT FOR AN OPEN

- Disconnect: Driver Seat Control Switch C352.

- Measure the resistance between driver seat control switch C352-8, circuit CPS24 (GY), harness side and driver seat front height motor C382-2, circuit CPS24 (GY), harness side.

Is the resistance less than 5 ohms?

Yes
GO to E11.

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 (Supplemental Restraint System). REFER to Restraints and Safety Systems &/or Air Bag Systems.

E11 CHECK THE FRONT HEIGHT MOTOR CIRCUIT FOR AN OPEN

- Measure the resistance between driver seat control switch C352-1, circuit CPS25 (WH/VT), harness side, and driver seat front height motor C382-1, circuit CPS25 (WH/VT), harness side.