System Tests: Notes

NOTE: Check operation of driver's power seat in manual mode (using power seat switch) and in memory mode (using return switch). Memory problems with power seats may be caused by problems in power tilt/telescopic steering system.

SYSTEM TEST INDEX

Symptom

Test Or Action

Manual & Memory Modes Inoperative

Battery Power Source Circuit Test

DRIVER'S SEAT SWITCH TEST under COMPONENT TESTS

Motor Circuit Test

⁽¹⁾ Check Power Seat ECU

One Function Operation Inoperative

Motor Ckt Test

Replace Power Seat ECU

One Or More Functions Inoperative (Manual Mode Only)

DRIVER'S SEAT SWITCH TEST under COMPONENT TESTS

⁽¹⁾ Check Power Seat ECU

Memory Function Inoperative

DRIVER'S SEAT SWITCH TEST under COMPONENT TESTS

Ignition Switch Circuit Test

⁽¹⁾ Check Power Seat ECU

⁽²⁾ Check Instrument Panel ECU

Memory Function Does Not Stop When Brake Pedal Is Depressed

⁽¹⁾ Check Power Seat ECU

⁽²⁾ Check Instrument Panel ECU

Return Function Inoperative Or Intermittent (All Functions)

ECU Power Source Circuit Test

Position Sensor Power Source Circuit Test

⁽¹⁾ Check Power Seat ECU

⁽²⁾ Check Instrument Panel ECU

Return Function Inoperative Or Intermittent (One Function)

Position Sensor Circuit Test

⁽¹⁾	Check driver's seat ECU inputs. See CIRCUIT TESTS (PIN VOLTAGE TESTS) . If inputs are okay, replace ECU.

⁽²⁾	See INSTRUMENT PANELS article.

Fig 1: Driver's Seat ECU Harness Connector Terminals