Position Sensor Circuit Test
NOTE:
Power seat ECU applies voltage to each position sensor. When a power seat motor turns one revolution, a position sensor returns a voltage pulse signal to power seat ECU. Power seat ECU uses pulse signals to determine the number of motor revolutions to return seat to memorized position. If power seat ECU does not receive a signal, it prevents seat from returning to memorized position, even if seat motor is okay.
- Connect an analog (needle-type) voltmeter between suspect position sensor harness connector terminals No. 2 and 3. See Fig 1. Operate seat motor by connecting battery power to motor.
- While motor is running, voltmeter needle should deflect every .25 second (okay indication). If voltmeter needle does not deflect every .25 second, replace position sensor (part of motor). If voltmeter indicates as specified, check for faulty circuit between position sensor and power seat ECU. See WIRING DIAGRAMS . If circuit is okay, replace power seat ECU.