Inspection Procedure

WARNING: This page is about a different car, the 2006 Lexus RX 400h. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT POSITION CONTROL ECU AND SWITCH ASSEMBLY (POWER SEAT CONTROL SWITCH AND ECU POWER SOURCE CIRCUIT)

Disconnect the position control ECU and switch assembly connectors.

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

Voltage

POSITION CONTROL ECU AND SWITCH ASSEMBLY (POWER SEAT CONTROL SWITCH AND ECU POWER SOURCE CIRCUIT)

Tester Connection	Condition	Specified Condition
P33-5(+B) - Body ground	Always	10 to 14 V
P32-4(IG) - Body ground	Ignition switch on	10 to 14 V
P32-8(SYSB) - Body ground	Always	10 to 14 V

Fig 1: Inspecting Position Control ECU And Switch Assembly (Power Seat Control Switch And ECU Power Source Circuit)

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NG : REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

OK : GO TO NEXT STEP.

INSPECT POSITION CONTROL ECU AND SWITCH ASSEMBLY (POWER SEAT CONTROL SWITCH AND ECU GROUND CIRCUIT)

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

Resistance

POSITION CONTROL ECU AND SWITCH ASSEMBLY (POWER SEAT CONTROL SWITCH AND ECU GROUND CIRCUIT)

Tester Connection	Condition	Specified Condition
P33-1(GND) - Body ground	Always	Below 1 Ω

Fig 2: Inspecting Position Control ECU And Switch Assembly (Power Seat Control Switch And ECU Ground Circuit)

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND CIRCUIT)

OK : PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE