Lexus IS250 IS220d GSE20 ALE20 - SEAT

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT FRONT POWER SEAT SWITCH (POSITION CONTROL ECU POWER SOURCE CIRCUIT)

INSPECT FRONT POWER SEAT SWITCH (POSITION CONTROL ECU GROUND CIRCUIT)

FRONT POWER SEAT CONTROL SYSTEM (w/ Seat Position Memory System) - Driver Side ECU Power Source Circuit

DESCRIPTION

The driver side position control ECU is contained in the driver 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 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 driver side front power seat switch (position control ECU).

• HINT:

Lumbar support operation can be performed at all times.

WIRING DIAGRAM

INSPECTION PROCEDURE

LHD

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

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	10 to 14 V
  U7-4 (IG) - Body ground	Engine switch on (IG)	10 to 14 V
  U7-8 (SYSB) - Body ground	Always	10 to 14 V

RHD

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

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	10 to 14 V
  T7-4 (IG) - Body ground	Engine switch on (IG)	10 to 14 V
  T7-8 (SYSB) - Body ground	Always	10 to 14 V

LHD

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

RHD

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