Toyota RAV4 manuals

Toyota Sienna Service Manual: Power Seat Motor Circuit

DESCRIPTION

When the power seat control switch is operated, a command signal is sent to the position control ECU and switch assembly (power seat control switch and ECU). The front power seat switch 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 and switch assembly (power seat control switch and ECU) is designed so that any malfunction of the seat memory system will not interfere with manual seat control.

If the position control ECU and switch assembly (power seat control switch and ECU) detects a low motor speed, abnormal activity, or sudden motor current fluctuation, the system will stop the motor. If the motor operates continuously for 120 seconds or more, the system will stop the motor until the switch is turned on again.

WIRING DIAGRAM

WIRING DIAGRAM

WIRING DIAGRAM

INSPECTION PROCEDURE

1 CHECK FRONT POWER SEAT OPERATION

  1. Check that each function of the power seat operates normally by using the front power seat switches.

Result

Result

2 READ VALUE OF INTELLIGENT TESTER (FRONT POWER SEAT SWITCH)

  1. Check the DATA LIST for proper functioning of the front power seat switch.

Position control ECU & switch assembly LH, RH

Position control ECU & switch assembly LH, RH

OK: On tester screen, each item changes between ON and OFF according to above chart.

3 PERFORM ACTIVE TEST BY ACTIVE TEST USING INTELLIGENT TESTER (POWER SEAT MOTOR)

  1. Select the ACTIVE TEST, use the intelligent tester to generate a control command, and then check that the power seat motors operate.

Position control ECU & switch assembly (driver, passenger side)

Position control ECU & switch assembly

Position control ECU & switch assembly

OK: The power seat motors operate normally.

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

4 INSPECT FRONT SEAT ADJUSTER SUB-ASSEMBLY (POWER SEAT MOTOR)

  1. Inspect the power seat motor.

OK: The power seat motor operates.

5 CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU AND SWITCH ASSEMBLY - POWER SEAT MOTOR)

CHECK HARNESS AND CONNECTOR

  1. Disconnect the position control ECU and switch assembly connector and power seat motor connectors.
  2.  Measure the resistance according to the value(s) in the table below.

Standard resistance

Standard resistance

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

6 CHECK WIRE HARNESS (POWER SEAT CONTROL SWITCH - BATTERY AND BODY GROUND)

CHECK WIRE HARNESS

  1. Disconnect the P49 switch connector.
  2.  Measure the voltage and resistance of the wire harness side connectors.

Standard voltage (Driver side)

Standard voltage

Standard resistance (Driver side)

Standard resistance

7 INSPECT POWER SEAT CONTROL SWITCH (LUMBER SUPPORT CONTROL)

  1. Inspect the power seat control switch

8 INSPECT FRONT SEAT ADJUSTER SUB-ASSEMBLY (POWER SEAT MOTOR)

  1. Inspect the power seat motor.

OK: The power seat motor operates

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SEAT CONTROL SWITCH - POWER SEAT MOTOR)

On-vehicle inspection
1. CHECK POWER SEAT FUNCTION  Check the basic functions.  Operate the power seat switches and check the following seat functions:  Sliding  Reclining &nbs ...

Driving Position Memory Switch Circuit (w/ Memory)
DESCRIPTION The seat memory switch sends signals to the outer mirror control ECU LH via the multiplex communication system to memorize a given seat position. This memory system does not use a po ...

Other materials:

Problem symptoms table
HINT:  Use the table below to help determine the cause of the problem symptom. The likely causes of the problem are indicated in descending order. Check each suspected area in order. Repair or replace faulty parts or perform adjustments as necessary.  Inspect the fuse and rel ...

Installation
1. INSTALL SPIRAL CABLE  Check that the front wheels are facing straight ahead.  Set the turn signal switch to the neutral position. NOTICE: If it is not in the neutral position, the pin of the turn signal switch may snap. Install the spiral cable. NOTICE: When ...

Basic inspection
When a malfunction is not confirmed by the DTC check, troubleshooting should be carried out in all circuits considered to be possible causes of the problem. In many cases, by carrying out the basic engine check shown in the following flowchart, the location of the problem can be found quickly a ...

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