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

Seats

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

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

Normal Operation

When pressed in 1 of 6 available directions, the seat control switch supplies battery voltage and ground to horizontal motor circuits 986 (YE/WH) and 987 (RD/WH), front height motor circuits 984 (YE/LB) and 985 (RD/LB) or rear height motor circuits 988 (YE/LG) and 989 (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 C: THE POWER SEAT DOES NOT MOVE HORIZONTALLY/VERTICALLY - PASSENGER

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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C1 CHECK THE HORIZONTAL MOTOR FOR CORRECT OPERATION

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

Yes
GO to C5.

No
GO to C2.

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C2 CHECK THE VOLTAGE TO THE 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: Passenger Seat Side Air Bag C316.
- Connect: Restraint System Diagnostic Service Tool 418-133 to Passenger Seat Side Air Bag C316.
- Disconnect: Passenger Power Seat Motor C3015.

- 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 passenger power seat motor C3015-4, circuit 986 (YE/WH), harness side and C3015-1, circuit 987 (RD/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 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 passenger seat side air bag module C316. CONNECT passenger seat side air bag module C316. REPOWER the SRS. REFER to Air Bag Systems.

No
GO to C3.

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C3 CHECK HORIZONTAL MOTOR CIRCUIT 986 (YE/WH) FOR AN OPEN

- Disconnect: Passenger Seat Control Switch C627.
- Measure resistance between passenger seat control switch C627-8, circuit 986 (YE/WH), harness side and passenger power seat motor C3015-4, circuit 986 (YE/WH), harness side.

- Is the resistance less than 5 ohms?

Yes
GO to C4.

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

DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic service tool from passenger seat side air bag module C316. CONNECT passenger seat side air bag module C316. REPOWER the SRS. REFER to Air Bag Systems.

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C4 CHECK HORIZONTAL MOTOR CIRCUIT 987 (RD/WH) FOR AN OPEN

- Measure resistance between passenger seat control switch C627-9, circuit 987 (RD/WH), harness side and passenger power seat motor C3015-1, circuit 987 (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 passenger seat side air bag module C316. CONNECT passenger seat side air bag module C316. 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 passenger seat side air bag module C316. CONNECT passenger seat side air bag module C316. REPOWER the SRS. REFER to Air Bag Systems.

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C5 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 C6.

If only the rear height adjust operates, GO to C9.

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 passenger seat side air bag module C316. CONNECT passenger seat side air bag module C316. REPOWER the SRS. REFER to Air Bag Systems.

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C6 CHECK THE 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 Air Bag Systems.
- Disconnect: Passenger Seat Side Air Bag C316.
- Connect: Restraint System Diagnostic Service Tool 418-133 to Passenger Seat Side Air Bag C316.
- Disconnect: Passenger Power Seat Motor C3015.

- 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 passenger power seat motor C3015-6, circuit 988 (YE/LG), harness side and C3015-5, circuit 989 (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 passenger seat side air bag module C316. CONNECT passenger seat side air bag module C316. REPOWER the SRS. REFER to Air Bag Systems.

No
GO to C7.

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C7 CHECK REAR HEIGHT MOTOR CIRCUIT 988 (YE/LG) FOR AN OPEN

- Disconnect: Passenger Seat Control Switch C627.
- Measure resistance between passenger seat control switch C627-5, circuit 988 (YE/LG), harness side and passenger power seat motor C3015-6, circuit 988 (YE/LG), harness side.

- Is the resistance less than 5 ohms?

Yes
GO to C8.

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

DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic service tool from passenger seat side air bag module C316. CONNECT passenger seat side air bag module C316. REPOWER the SRS. REFER to Air Bag Systems.

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C8 CHECK REAR HEIGHT MOTOR CIRCUIT 989 (RD/LG) FOR AN OPEN

- Measure resistance between passenger seat control switch C627-4, circuit 989 (RD/LG), harness side and passenger power seat motor C3015-5, circuit 989 (RD/LG), 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 passenger seat side air bag module C316. CONNECT passenger seat side air bag module C316. 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 passenger seat side air bag module C316. CONNECT passenger seat side air bag module C316. REPOWER the SRS. REFER to Air Bag Systems.

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C9 CHECK THE 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 Air Bag Systems.
- Disconnect: Passenger Seat Side Air Bag C316.
- Connect: Restraint System Diagnostic Service Tool 418-133 to Passenger Seat Side Air Bag C316.
- Disconnect: Passenger Power Seat Motor C3015.

- 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.
- Disconnect: Passenger Power Seat Motor C3015.
- Measure voltage between passenger power seat motor C3015-2, circuit 984 (YE/LB), harness side and C3015-3, circuit 985 (RD/LB), 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 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 passenger seat side air bag module C316. CONNECT passenger seat side air bag module C316. REPOWER the SRS. REFER to Air Bag Systems.

No
GO to C10.

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C10 CHECK FRONT HEIGHT MOTOR CIRCUIT 984 (YE/LB) FOR AN OPEN

- Disconnect: Passenger Seat Control Switch C627.
- Measure resistance between passenger seat control switch C627-7, circuit 984 (YE/LB), harness side and passenger power seat motor C3015-2, circuit 984 (YE/LB), harness side.

- Is the resistance less than 5 ohms?

Yes
GO to C11.

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

DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic service tool from passenger seat side air bag module C316. CONNECT passenger seat side air bag module C316. REPOWER the SRS. REFER to Air Bag Systems.

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C11 CHECK FRONT HEIGHT MOTOR CIRCUIT 985 (RD/LB) FOR AN OPEN

- Measure resistance between passenger seat control switch C627-1, circuit 985 (RD/LB), harness side and passenger front height motor C3015-3, circuit 985 (RD/LB), harness side.