Power seats without memory are completely controlled through the seat adjuster switch. Battery voltage is supplied at all times to the seat adjuster switch from the PWR/SEAT 25A circuit breaker that is located in the I/P fuse block. When the seat adjuster switches are in an inactive state, the switch contacts are closed to the switch ground circuit. When a power seat switch is pressed to an active state the switch contact is closed to the battery voltage supply circuit. Each seat adjuster motor is controlled by the power seat switch through 2 motor control circuits. The seat adjuster motors are bidirectional and the direction of adjuster motor rotation is determined by which of the adjuster motor control circuits is switched to battery voltage while the other remains grounded.

Schematic Reference

Passenger Seat Schematics

Connector End View Reference

Power Seat Connector End Views

Electrical Information Reference

1. Disconnect the harness connector at the seat adjuster switch.
2. Test for less than 1 ohm of resistance between the ground circuit terminal B and ground.

⇒	If greater than 1 ohm, test the ground circuit for an open/high resistance.

3. Verify that a test lamp illuminates between the B+ circuit terminal and ground.

⇒	If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.

4. Connect the harness connector at the seat adjuster switch.
5. Disconnect the harness connector at the inoperative seat motor assembly.
6. Connect a test lamp across the inoperative motor control circuit terminals.
7. Verify that the test lamp illuminates while pressing the appropriate seat switch in both directions.

⇒	If the test lamp does not illuminate for both directions, test the motor circuits for a short to ground or an open/high resistance. If the circuits test normal replace the seat adjuster switch.

8. If the circuits test normal replace the inoperative motor assembly.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.