Pinpoint Test B: The Power Seat Does Not Move Horizontally/Vertically - Driver

Seats

Pinpoint Test B: The Power Seat Does Not Move Horizontally/Vertically - Driver

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

Normal Operation

When pressed in 1 of 6 possible directions, the seat control switch supplies battery voltage and ground to horizontal motor circuits 980 (YE/WH) and 981 (RD/WH), front height motor circuits 978 (YE/LB) and 979 (RD/LB) or rear height motor circuits 982 (YE/LG) and 983 (RD/LG). The seat control switch is normally closed to ground on all 6 of the seat motor circuits. When the seat control switch is toggled in one direction to supply voltage to a motor circuit, the opposite motor circuit is already connected to ground through the switch supplying voltage and ground to the motor to move the seat. Toggling the seat control switch in the opposite direction reverses polarity to the motor moving the seat in the opposite direction.

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

PINPOINT TEST B: THE POWER SEAT DOES NOT MOVE HORIZONTALLY/VERTICALLY - DRIVER

WARNING: Remove restraint system diagnostic tools from the vehicle prior to road testing. If tools are not removed, the supplemental restraint system (SRS) device may not deploy in a crash. Failure to follow this instruction may result in serious personal injury or death in a crash and possibly violate vehicle safety standards.

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

NOTICE: Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the pinpoint test. Inspection and Verification

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B1 CHECK THE HORIZONTAL MOTOR FOR CORRECT OPERATION

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

Yes
GO to B5.

No
GO to B2.

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B2 CHECK THE VOLTAGE TO THE DRIVER SEAT HORIZONTAL MOTOR

- Ignition OFF.
- Depower the Supplemental Restraint System (SRS). Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Air Bag Systems.
- Disconnect: Driver Seat Side Air Bag C315.
- Connect: Restraint System Diagnostic Service Tool 418-133 to Driver Seat Side Air Bag C315.
- Disconnect: Driver Power 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.
- Measure voltage between driver power seat motor C353-4, circuit 980 (YE/WH), harness side and C353-1, circuit 981 (RD/WH), 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 toggled in both directions and 0 volt in the rest position?

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

DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic service tool from driver seat side air bag module C315. CONNECT driver seat side air bag module C315. REPOWER the SRS. REFER to Air Bag Systems.

No
GO to B3.

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B3 CHECK THE HORIZONTAL MOTOR CIRCUIT 980 (YE/WH) FOR AN OPEN

- Disconnect: Driver Seat Control Switch C519.
- Measure resistance between driver seat control switch C519-8, circuit 980 (YE/WH), harness side and driver power seat motor C353-4, circuit 980 (YE/WH), harness side.

- Is the resistance less than 5 ohms?

Yes
GO to B4.

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

DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic service tool from driver seat side air bag module C315. CONNECT driver seat side air bag module C315. REPOWER the SRS. REFER to Air Bag Systems.

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B4 CHECK HORIZONTAL MOTOR CIRCUIT 981 (RD/WH) FOR AN OPEN

- Measure resistance between driver seat control switch C519-9, circuit 981 (RD/WH), harness side and driver power seat motor C353-1, circuit 981 (RD/WH), harness side.

- Is the resistance less than 5 ohms?

Yes
INSTALL a new seat control switch. REFER to Seat Control Switch Seat Control Switch. TEST the system for normal operation.

DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic service tool from driver seat side air bag module C315. CONNECT driver seat side air bag module C315. REPOWER the SRS. REFER to Air Bag Systems.

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

DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic service tool from driver seat side air bag module C315. CONNECT driver seat side air bag module C315. REPOWER the SRS. REFER to Air Bag Systems.

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B5 DETERMINE THE SEAT HEIGHT ADJUST FAILURE

- Determine the seat height adjust failure.
- Does the seat front or rear height adjust up and down?

Yes
If only the front height adjust operates, GO to B6.

If only the rear height adjust operates, GO to B9.

No
INSTALL a new seat control switch. REFER to Seat Control Switch Seat Control Switch. TEST the system for normal operation.

DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic service tool from driver seat side air bag module C315. CONNECT driver seat side air bag module C315. REPOWER the SRS. REFER to Air Bag Systems.

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B6 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 Air Bag Systems.
- Disconnect: Driver Seat Side Air Bag C315.
- Connect: Restraint System Diagnostic Service Tool 418-133 to Driver Seat Side Air Bag C315.
- Disconnect: Driver Power 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 voltage between driver power seat motor C353-6, circuit 982 (YE/LG), harness side and C353-5, circuit 983 (RD/LG), 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 toggled in both directions and 0 volt in the rest position?

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

DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic service tool from driver seat side air bag module C315. CONNECT driver seat side air bag module C315. REPOWER the SRS. REFER to Air Bag Systems.

No
GO to B7.

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B7 CHECK REAR HEIGHT MOTOR CIRCUIT 982 (YE/LG) FOR AN OPEN

- Disconnect: Driver Seat Control Switch C519.
- Measure resistance between driver seat control switch C519-5, circuit 982 (YE/LG), harness side and driver power seat motor C353-6, circuit 982 (YE/LG), harness side.

- Is the resistance less than 5 ohms?

Yes
GO to B8.

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

DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic service tool from driver seat side air bag module C315. CONNECT driver seat side air bag module C315. REPOWER the SRS. REFER to Air Bag Systems.

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B8 CHECK REAR HEIGHT MOTOR CIRCUIT 983 (RD/LG) FOR AN OPEN

- Measure resistance between driver seat control switch C519-4, circuit 983 (RD/LG), harness side and driver power seat motor C353-5, circuit 983 (RD/LG), harness side.

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

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

DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic service tool from driver seat side air bag module C315. CONNECT driver seat side air bag module C315. REPOWER the SRS. REFER to Air Bag Systems.

No
GO to B10.

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B10 CHECK FRONT HEIGHT MOTOR CIRCUIT 978 (YE/LB) FOR AN OPEN

- Disconnect: Driver Seat Control Switch C519.
- Measure resistance between driver seat control switch C519-7, circuit 978 (YE/LB), harness side and driver power seat motor C353-2, circuit 978 (YE/LB), harness side.

- Is the resistance less than 5 ohms?

Yes
GO to B11.

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

DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic service tool from driver seat side air bag module C315. CONNECT driver seat side air bag module C315. REPOWER the SRS. REFER to Air Bag Systems.

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B11 CHECK FRONT HEIGHT MOTOR CIRCUIT 979 (RD/LB) FOR AN OPEN

- Measure resistance between driver seat control switch C519-1, circuit 979 (RD/LB) harness side, and driver power seat motor C353-3, circuit 979 (RD/LB), harness side.