One Or More Power Seat Motors Do Not Operate
SEAT: FRONT POWER SEAT CONTROL SYSTEM (w/ Seat Position Memory System): One or more Power Seat Motors do not Operate
One or more Power Seat Motors do not Operate
DESCRIPTION
When the power seat control switch is operated, a command signal is sent to the position control ECU. The position control ECU then controls the appropriate seat motor as needed. This memory system does not use a seat position sensor. The seat position is detected by counting pulses that are output when the motor turns. If there is no pulse output from the motor, the motor will stop operating. The position control ECU is designed so that a malfunction of the seat memory system will not interfere with manual seat control.
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
1. CHECK FRONT POWER SEAT OPERATION
(a) Check that each function of the power seat operates normally by using the front power seat switches.
Result:
B -- CHECK WIRE HARNESS (LUMBAR FRONT POWER SEAT SWITCH - LUMBAR FRONT POWER SEAT SWITCH AND BODY GROUND)
A -- Continue to next step.
2. READ VALUE USING TECHSTREAM (FRONT POWER SEAT SWITCH)
(a) Check the DATA LIST for proper functioning of the front power seat switch.
Position control ECU & switch assembly LH, RH:
OK:
On tester screen, each item changes between ON and OFF according to above chart.
NG -- REPLACE POSITION CONTROL ECU & SWITCH ASSEMBLY
OK -- Continue to next step.
3. PERFORM ACTIVE TEST USING TECHSTREAM (POWER SEAT MOTOR)
(a) Select the ACTIVE TEST, use the Techstream to generate a control command, and then check that the power seat motors operate.
Position control ECU & switch assembly (driver, passenger side):
OK:
The power seat motors operate normally.
Result:
C -- REPLACE POSITION CONTROL ECU & SWITCH ASSEMBLY
B -- INSPECT FRONT SEAT FRAME WITH ADJUSTER RH (PASSENGER SIDE) (SLIDE MOTOR, FRONT VERTICAL MOTOR, LIFTER MOTOR, RECLINING MOTOR)
A -- Continue to next step.
4. INSPECT FRONT SEAT FRAME WITH ADJUSTER LH (DRIVER SIDE) (SLIDE MOTOR, FRONT VERTICAL MOTOR, LIFTER MOTOR, RECLINING MOTOR)
(a) Remove the front seat adjuster LH.
(b) Check operation of the slide motor.
(1) Check if the seat adjuster moves smoothly when the battery is connected to the slide motor connector terminals.
OK:
(c) Check operation of the front vertical motor.
(1) Check if the seat adjuster moves smoothly when the battery is connected to the front vertical motor connector terminals.
OK:
(d) Check operation of the lifter motor.
(1) Check if the seat adjuster moves smoothly when the battery is connected to the lifter motor connector terminals.
OK:
(e) Check operation of the reclining motor.
(1) Check if the seat adjuster moves smoothly when the battery is connected to the reclining motor connector terminals.
OK:
OK -- CHECK WIRE HARNESS (POSITION CONTROL ECU & SWITCH ASSEMBLY - POWER SEAT MOTOR ASSEMBLY AND BODY GROUND)
NG -- REPLACE FRONT SEAT FRAME WITH ADJUSTER LH
5. INSPECT FRONT SEAT FRAME WITH ADJUSTER RH (PASSENGER SIDE) (SLIDE MOTOR, FRONT VERTICAL MOTOR, LIFTER MOTOR, RECLINING MOTOR)
(a) Remove the front seat adjuster RH.
(b) Check operation of the slide motor.
(1) Check if the seat adjuster moves smoothly when the battery is connected to the slide motor connector terminals.
OK:
(c) Check operation of the front vertical motor.
(1) Check if the seat adjuster moves smoothly when the battery is connected to the front vertical motor connector terminals.
OK:
(d) Check operation of the lifter motor.
(1) Check if the seat adjuster moves smoothly when the battery is connected to the lifter motor connector terminals.
OK:
(e) Check operation of the reclining motor.
(1) Check if the seat adjuster moves smoothly when the battery is connected to the reclining motor connector terminals.
OK:
NG -- REPLACE FRONT SEAT FRAME WITH ADJUSTER RH
OK -- Continue to next step.
6. CHECK WIRE HARNESS (POSITION CONTROL ECU & SWITCH ASSEMBLY - POWER SEAT MOTOR ASSEMBLY AND BODY GROUND)
(a) Disconnect the b8 or a6 switch connector.
(b) Disconnect the b3, b4, b10, b15, a1, a4, a10 or a15 motor connector.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:
Driver side:
Passenger side:
NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- REPLACE POSITION CONTROL ECU & SWITCH ASSEMBLY
7. CHECK WIRE HARNESS (LUMBAR FRONT POWER SEAT SWITCH - LUMBAR FRONT POWER SEAT SWITCH AND BODY GROUND)
(a) Disconnect the b6 or a8 switch connector.
(b) Measure the voltage and resistance of the wire harness side connectors.
Standard voltage:
Driver side:
Passenger side
Standard resistance:
Driver side:
Passenger side:
NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.
8. INSPECT LUMBAR FRONT POWER SEAT SWITCH
(a) Remove the switch.
(b) Measure the resistance between the terminals when the switch is operated.
Standard resistance:
Driver side:
Passenger side:
NG -- REPLACE LUMBAR FRONT POWER SEAT SWITCH
OK -- Continue to next step.
9. INSPECT LUMBAR SUPPORT ADJUSTER ASSEMBLY
(a) Remove the lumbar support adjuster.
(b) Check operation of the lumbar support adjuster.
(1) Check that the lumbar support adjuster moves smoothly when the battery is connected to the lumbar support adjuster motor connector terminals.
OK:
NG -- REPLACE LUMBAR SUPPORT ADJUSTER ASSEMBLY
OK -- REPAIR OR REPLACE HARNESS AND CONNECTOR (LUMBAR FRONT POWER SEAT SWITCH - LUMBAR SUPPORT ADJUSTER ASSEMBLY)