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

Seats

Pinpoint Tests

Pinpoint Test I: 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

The driver seat control switch is powered by battery voltage on circuit SBB74 (YE/RD) and is supplied ground on circuit GD143 (BK/VT). When pressed, the seat control switch supplies that voltage and ground to a power seat track motor to move the seat. When pressed in the opposite direction, the seat control switch reverses the polarity to that same power seat track motor, which moves the seat 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). If a new motor needs to be installed, it is necessary to install an entire power seat track.

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

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

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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I1 CHECK THE HORIZONTAL MOTOR FOR CORRECT OPERATION

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

Yes
GO to I5.

No
GO to I2.

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I2 CHECK FOR VOLTAGE TO THE HORIZONTAL MOTOR

- Ignition OFF.
- 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: Driver Seat Safety Belt Buckle Pretensioner C3049.
- Disconnect: Driver Seat Side Air Bag 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.
- Measure the voltage between driver seat horizontal motor C362-3, circuit CPS28 (GN), harness side and C362-4, 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 in both directions and 0 volt in the rest position?

Yes
INSTALL a new driver seat track assembly. REFER to Seat Track - Power Seat Track - Power. TEST the system for normal operation.

DISCONNECT the battery ground cable. CONNECT driver safety belt buckle pretensioner C3049.

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 I3.

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I3 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 C362-3, circuit CPS28 (GN), harness side.

- Is the resistance less than 5 ohms?

Yes
GO to I4.

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

DISCONNECT the battery ground cable. CONNECT driver safety belt buckle pretensioner C3049.

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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I4 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 C362-4, circuit CPS23 (GN/VT), harness side.

- Is the resistance less than 5 ohms?

Yes
INSTALL a new driver 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 safety belt buckle pretensioner C3049.

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 safety belt buckle pretensioner C3049.

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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I5 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 I6.

If only rear height adjust operates, GO to I9.

No
INSTALL a new driver 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 safety belt buckle pretensioner C3049.

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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I6 CHECK FOR VOLTAGE TO THE REAR HEIGHT MOTOR

- Ignition OFF.
- 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: Driver Seat Safety Belt Buckle Pretensioner C3049.
- Disconnect: Driver Seat Side Air Bag 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.
- Measure the voltage between driver seat rear height motor C363-3, circuit CPS27 (BU/BN), harness side and C363-4, circuit CPS26 (YE/BU), harness side, while depressing 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 - Power Seat Track - Power. TEST the system for normal operation.

DISCONNECT the battery ground cable. CONNECT driver safety belt buckle pretensioner C3049.

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 I7.

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I7 CHECK THE REAR HEIGHT MOTOR CIRCUIT FOR AN OPEN

- Disconnect: Driver Seat Control Switch C352.
- Measure the resistance between driver seat control switch C352-5, circuit CPS27 (BU/BN), harness side and driver seat rear height motor C363-3, circuit CPS27 (BU/BN), harness side.

- Is the resistance less than 5 ohms?

Yes
GO to I8.

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

DISCONNECT the battery ground cable. CONNECT driver safety belt buckle pretensioner C3049.

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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I8 CHECK THE REAR HEIGHT MOTOR CIRCUIT FOR AN OPEN

- Measure the resistance between driver seat control switch C352-7, circuit CPS26 (YE/BU), harness side and driver seat rear height motor C363-4, 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 - Front Seat Control Switch - Front. TEST the system for normal operation.

DISCONNECT the battery ground cable. CONNECT driver safety belt buckle pretensioner C3049.

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 safety belt buckle pretensioner C3049.

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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I9 CHECK FOR VOLTAGE TO THE FRONT HEIGHT MOTOR

- Ignition OFF.
- 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: Driver Seat Safety Belt Buckle Pretensioner C3049.
- Disconnect: Driver Seat Side Air Bag 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.
- Measure the voltage between driver seat front height motor C382-3, circuit CPS25 (WH/VT), harness side and C382-4, circuit CPS24 (GY), while pushing 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 - Power Seat Track - Power. TEST the system for normal operation.

DISCONNECT the battery ground cable. CONNECT driver safety belt buckle pretensioner C3049.

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 I10.

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I10 CHECK THE FRONT HEIGHT MOTOR CIRCUIT FOR AN OPEN

- Disconnect: Driver Seat Control Switch C352.
- Measure the resistance between driver seat control switch C352-1, circuit CPS25 (WH/VT), harness side and driver seat front height motor C382-3, circuit CPS25 (WH/VT), harness side.

- Is the resistance less than 5 ohms?

Yes
GO to I11.

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

DISCONNECT the battery ground cable. CONNECT driver safety belt buckle pretensioner C3049.

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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I11 CHECK THE FRONT HEIGHT MOTOR CIRCUIT FOR AN OPEN

- Measure the resistance between driver seat control switch C352-8, circuit CPS24 (GY), harness side, and driver seat front height motor C382-4, circuit CPS24 (GY), harness side.