FRONT POWER SEAT CONTROL SYSTEM Front Passenger Side ECU Power Source Circuit

DESCRIPTION

The front passenger side position control ECU is contained in the front passenger side front power seat switch.

During manual operation, only one switch signal is accepted. If signals are input from 2 or more switches simultaneously, all of them are ignored, except when signals are input from the front vertical switch and lifter switch simultaneously. In this case, the signal from the lifter switch will operate.

During automatic operation, a manual switch input will override any other operations, i.e. automatic operations will stop and the manual input operation only will be accepted. For example, if a manual switch input is activated during a seat store/restore operation, the previous operation will cease and manual operation will be performed. After the manual operation is performed, the previous automatic operation will not resume.

The power mirror store/restore operation is unaffected by manual switch inputs.

The front passenger side front power seat switch does not allow the restore operation of the power seat when the system detects that the voltage of terminal SYSB is less than 8.0 +/- 0.5 V for 30 msec. or is more than 10 +- 0.5 V for 30 msec.

This circuit is the power source circuit for the front passenger side front power seat switch (position control ECU).

Tech Tips


  • Manual adjustment of the slide, reclining, or lumbar can be performed even when the front passenger side front power seat switch is not functional if current is allowed to flow into terminals +B and SYSB.

Lumbar support operation can be performed at all times.

WIRING DIAGRAM

A01601SE05
A015ZJAE05

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Check for DTCs B2271, B2272 and B2274.

      Result
      Result Proceed to
      No DTC is output A
      Any of DTC is output B

    B

    GO TO ENTRY AND START SYSTEM Click here

    A

  2. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU - BATTERY)


    1. A015ZS8E02

      for LHD:


      1. Disconnect the front power seat switch RH (position control ECU) connectors.

      2. Measure the voltage according to the value(s) in the table below.

        Standard Voltage
        Tester Connection Condition Specified Condition
        T6-5 (+B) - Body ground Always 11 to 14 V
        T7-4 (IG) - Body ground Engine switch on (IG) 11 to 14 V
        T7-8 (SYSB) - Body ground Always 11 to 14 V
    2. A015ZS8E01

      for RHD:


      1. Disconnect the front power seat switch LH (position control ECU) connectors.

      2. Measure the voltage according to the value(s) in the table below.

        Standard Voltage
        Tester Connection Condition Specified Condition
        U6-5 (+B) - Body ground Always 11 to 14 V
        U7-4 (IG) - Body ground Engine switch on (IG) 11 to 14 V
        U7-8 (SYSB) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

    OK

  3. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU - GROUND)


    1. A0161E5E02

      for LHD:


      1. Measure the resistance according to the value(s) in the table below.

        Standard Resistance
        Tester Connection Condition Specified Condition
        T6-1 (GND) - Body ground Always Below 1 Ω
    2. A0161E5E01

      for RHD:


      1. Measure the resistance according to the value(s) in the table below.

        Standard Resistance
        Tester Connection Condition Specified Condition
        U6-1 (GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND CIRCUIT)

    OK

    PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Click here