Pinpoint Test G: The Power Seat Does Not Operate Correctly - Driver Seat With Power Recline
Seats
Pinpoint Tests
Pinpoint Test G: The Power Seat Does Not Operate Correctly - Driver Seat With Power Recline
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 battery voltage on circuit SBB14 (BN/RD) and ground on circuit GD133 (BK). When pressed, the seat control switch supplies that 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 that 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 mechanism
PINPOINT TEST G: THE POWER SEAT DOES NOT OPERATE CORRECTLY - DRIVER SEAT WITH POWER RECLINE
NOTE: The air bag warning indicator illuminates when the correct Restraints Control Module (RCM) fuse is removed and the ignition switch 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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G1 CHECK THE HORIZONTAL DIRECTION MOTOR FOR CORRECT OPERATION
- Operate the driver power seat forward and rearward.
- Will the seat move horizontally?
Yes
GO to G2.
No
GO to G3.
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G2 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 G6.
No
GO to G13.
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G3 CHECK VOLTAGE TO THE DRIVER 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: Driver Seat Safety Belt Buckle Pretensioner C3201.
- Disconnect: Driver Seat Side Air Bag C3049.
- Disconnect: Driver Seat Motor C353.
- 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 driver seat motor C353-6, circuit CPS28 (GN), harness side and C353-3, 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 switch is pushed forward, greater than +10 volts when the switch is pushed rearward and 0 volt when the switch is in a 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 safety belt buckle and pretensioner C3201.
CONNECT driver seat side air bag module C3049.
REPOWER the SRS. REFER to Restraint Systems.
No
GO to G4.
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G4 CHECK CIRCUIT CPS28 (GN) FOR AN OPEN AND SHORT TO GROUND
- Disconnect: Driver Seat Control Switch C352.
- Measure the resistance between:
- driver seat control switch C352-9, circuit CPS28 (GN), harness side and driver seat motor C353-6, circuit CPS28 (GN), harness side.
- driver seat control switch C352-9, circuit CPS28 (GN), harness side and ground.
- Is the resistance less than 5 ohms between the driver seat motor and the driver seat control switch; and greater than 10,000 ohms between the driver seat control switch and ground?
Yes
GO to G5.
No
REPAIR the circuit. TEST the system for normal operation.
DISCONNECT the battery ground cable.
CONNECT driver safety belt buckle and pretensioner C3201.
CONNECT driver seat side air bag module C3049.
REPOWER the SRS. REFER to Restraint Systems.
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G5 CHECK CIRCUIT CPS23 (GN/VT) FOR AN OPEN AND SHORT TO GROUND
- Measure the resistance between:
- driver seat control switch C352-4, circuit CPS23 (GN/VT), harness side and driver seat motor C353-3, circuit CPS23 (GN/VT), harness side.
- driver seat control switch C352-4, circuit CPS23 (GN/VT), harness side and ground.
- Is the resistance less than 5 ohms between the driver seat motor and the driver seat control switch; and greater than 10,000 ohms between the driver seat control switch and ground?
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 safety belt buckle and pretensioner C3201.
CONNECT driver seat side air bag module C3049.
REPOWER the SRS. REFER to Restraint Systems.
No
REPAIR the circuit. TEST the system for normal operation.
DISCONNECT the battery ground cable.
CONNECT driver safety belt buckle and pretensioner C3201.
CONNECT driver seat side air bag module C3049.
REPOWER the SRS. REFER to Restraint Systems.
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G6 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 G7.
If only the rear height adjust motor operates, GO to G10.
No
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 safety belt buckle and pretensioner C3201.
CONNECT driver seat side air bag module C3049.
REPOWER the SRS. REFER to Restraint Systems.
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G7 CHECK THE VOLTAGE TO THE DRIVER 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: Driver Seat Safety Belt Buckle Pretensioner C3201.
- Disconnect: Driver Seat Side Air Bag C3049.
- Disconnect: Driver Seat Motor C353.
- 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 driver seat motor C353-1, circuit CPS27 (BU/BN), harness side and C353-4, circuit CPS26 (YE/BU), harness side, while depressing the rear tilt switch up and down.
- Is the voltage greater than -10 volts when the rear tilt switch is pressed down, greater than +10 volts when the rear tilt switch is pressed up and 0 volt when the switch is 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 safety belt buckle and pretensioner C3201.
CONNECT driver seat side air bag module C3049.
REPOWER the SRS. REFER to Restraint Systems.
No
GO to G8.
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G8 CHECK CIRCUIT CPS27 (BU/BN) FOR AN OPEN AND SHORT TO GROUND
- Disconnect: Driver Seat Control Switch C352.
- Measure the resistance between:
- driver seat control switch C352-1, circuit CPS27 (BU/BN), harness side and driver seat motor C353-1, circuit CPS27 (BU/BN), harness side.
- driver seat control switch C352-1, circuit CPS27 (BU/BN), harness side and ground.
- Is the resistance less than 5 ohms between the driver seat motor and the driver seat control switch; and greater than 10,000 ohms between the driver seat control switch and ground?
Yes
GO to G9.
No
REPAIR the circuit. TEST the system for normal operation.
DISCONNECT the battery ground cable.
CONNECT driver safety belt buckle and pretensioner C3201.
CONNECT driver seat side air bag module C3049.
REPOWER the SRS. REFER to Restraint Systems.
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G9 CHECK CIRCUIT CPS26 (YE/BU) FOR AN OPEN AND SHORT TO GROUND
- Measure the resistance between:
- driver seat control switch C352-12, circuit CPS26 (YE/BU), harness side and driver seat rear motor C353-4, circuit CPS26 (YE/BU), harness side.
- driver seat control switch C352-12, circuit CPS26 (YE/BU), harness side and ground.
- Is the resistance less than 5 ohms between the driver seat motor and the driver seat control switch; and greater than 10,000 ohms between the driver seat control switch and ground?
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 safety belt buckle and pretensioner C3201.
CONNECT driver seat side air bag module C3049.
REPOWER the SRS. REFER to Restraint Systems.
No
REPAIR the circuit. TEST the system for normal operation.
DISCONNECT the battery ground cable. CONNECT driver safety belt buckle and pretensioner C3201.
CONNECT driver seat side air bag module C3049.
REPOWER the SRS. REFER to Restraint Systems.
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G10 CHECK VOLTAGE TO DRIVER SEAT FRONT 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: Driver Seat Safety Belt Buckle Pretensioner C3201.
- Disconnect: Driver Seat Side Air Bag C3049.
- Disconnect: Driver Seat Motor C353.
- 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 driver seat motor C353-2, circuit CPS25 (WH/VT), harness side and C353-5, circuit CPS24 (GY), while pushing the front tilting switch up and down.
- Is the voltage greater than +10 volts when the front tilt switch is pressed down, greater than -10 volts when the front tilt switch is pressed up and 0 volt when the switch is 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 safety belt buckle and pretensioner C3201.
CONNECT driver seat side air bag module C3049.
REPOWER the SRS. REFER to Restraint Systems.
No
GO to G11.
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G11 CHECK CIRCUIT CPS25 (WH/VT) FOR AN OPEN AND SHORT TO GROUND
- Disconnect: Driver Seat Control Switch C369.
- Measure the resistance between:
- driver seat control switch C352-2, circuit CPS25 (WH/VT), harness side and driver seat motor C353-2, circuit CPS25 (WH/VT), harness side.
- driver seat control switch C352-2, circuit CPS25 (WH/VT), harness side and ground.
- Is the resistance less than 5 ohms between the driver seat motor and the driver seat control switch; and greater than 10,000 ohms between the driver seat control switch and ground?
Yes
GO to G12.
No
REPAIR the circuit. TEST the system for normal operation.
DISCONNECT the battery ground cable.
CONNECT driver safety belt buckle and pretensioner C3201.
CONNECT driver seat side air bag module C3049.
REPOWER the SRS. REFER to Restraint Systems.
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G12 CHECK CIRCUIT CPS24 (GY) FOR AN OPEN AND SHORT TO GROUND
- Measure the resistance between:
- driver seat control switch C352-6, circuit CPS24 (GY), harness side, and driver seat motor C353-5, circuit CPS24 (GY), harness side.
- driver seat control switch C352-6, circuit CPS24 (GY), harness side and ground.
- Is the resistance less than 5 ohms between the driver seat motor and the driver seat control switch; and greater than 10,000 ohms between the driver seat control switch and ground?
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 safety belt buckle and pretensioner C3201.
CONNECT driver seat side air bag module C3049.
REPOWER the SRS. REFER to Restraint Systems.
No
REPAIR the circuit. TEST the system for normal operation.
DISCONNECT the battery ground cable.
CONNECT driver safety belt buckle and pretensioner C3201.
CONNECT driver seat side air bag module C3049.
REPOWER the SRS. REFER to Restraint Systems.
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G13 CHECK VOLTAGE TO THE DRIVER SEAT RECLINER MOTOR
- Ignition OFF.
- Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Restraint Systems.
- Disconnect: Driver Seat Safety Belt Buckle Pretensioner C3201.
- Disconnect: Driver Seat Side Air Bag C3049.
- Disconnect: Driver Seat Recliner Motor C3187.
- 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 driver seat recliner motor C3187-1, circuit CPS29 (WH/BN), harness side and C3187-5, circuit CPS30 (VT/BN), while pushing the recline switch forward and rearward.
- Is the voltage greater than +10 volts when the switch is pushed forward, greater than -10 volts when the switch is pushed rearward and 0 volt when the switch is in a rest position?
Yes
INSTALL a new driver seat recliner motor. REFER to Seat Recliner Motor Seat Recliner Motor. TEST the system for normal operation.
DISCONNECT the battery ground cable.
CONNECT driver safety belt buckle and pretensioner C3201.
CONNECT driver seat side air bag module C3049.
REPOWER the SRS. REFER to Restraint Systems.
No
GO to G14.
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G14 CHECK CIRCUIT CPS29 (WH/BN) FOR AN OPEN AND SHORT TO GROUND
- Disconnect: Driver Seat Control Switch C352.
- Measure the resistance between:
- driver seat control switch C352-11, circuit CPS29 (WH/BN), harness side and driver seat recliner motor C3187-1, circuit CPS29 (WH/BN), harness side.
- driver seat control switch C352-11, circuit CPS29 (WH/BN), harness side and ground.
- Is the resistance less than 5 ohms between the driver seat recliner motor and the driver seat control switch; and greater than 10,000 ohms between the driver seat control switch and ground?
Yes
GO to G15.
No
REPAIR the circuit. TEST the system for normal operation.
DISCONNECT the battery ground cable.
CONNECT driver safety belt buckle and pretensioner C3201.
CONNECT driver seat side air bag module C3049.
REPOWER the SRS. REFER to Restraint Systems.
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G15 CHECK CIRCUIT CPS30 (VT/BN) FOR AN OPEN AND SHORT TO GROUND
- Measure the resistance between:
- driver seat control switch C352-8, circuit CPS30 (VT/BN), harness side, and driver seat recliner motor C3187-5, circuit CPS30 (VT/BN), harness side.
- driver seat control switch C352-8, circuit CPS30 (VT/BN), harness side and ground.
- Is the resistance less than 5 ohms between the driver seat recliner motor and the driver seat control switch; and greater than 10,000 ohms between the seat control switch and ground?
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 safety belt buckle and pretensioner C3201.
CONNECT driver seat side air bag module C3049.
REPOWER the SRS. REFER to Restraint Systems.
No
REPAIR the circuit. TEST the system for normal operation.
DISCONNECT the battery ground cable.
CONNECT driver safety belt buckle and pretensioner C3201.
CONNECT driver seat side air bag module C3049.
REPOWER the SRS. REFER to Restraint Systems.
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