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.

CHECK FUSES (MPX-B, IGN, AM2 No.1)
1. Remove the MPX-B, IGN fuses from the instrument panel J/B.
2. Remove the AM2 No.1 fuse from the fusible link block.
3. Measure the resistance of the fuses.
  Resistance:
  
  Below 1 Ω
NG : CHECK FOR SHORT IN ALL HARNESS AND CONNECTOR CONNECTED TO FUSE AND REPLACE FUSE

OK : GO TO NEXT STEP

CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU ASSEMBLY - BATTERY)

Disconnect T9 ECU connector.

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

Voltage

TRANSPONDER KEY ECU ASSEMBLY - BATTERY

Tester Connection	Condition	Specified Condition
T9-2 (IG) - Body ground	Ignition switch off	Below 1 V
T9-2 (IG) - Body ground	Ignition switch on	10 to 14 V
T9-1 (CPUB) - Body ground	Always	0 to 14 V

Fig 1: Checking Harness And Connector (Transponder Key ECU Assembly - Battery)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR

OK : GO TO NEXT STEP

CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU ASSEMBLY - BODY GROUND)

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

Resistance

TRANSPONDER KEY ECU ASSEMBLY - BODY GROUND

Tester Connection	Condition	Specified Condition
T9-14 (GND) - Body ground	Always	Below 1 Ω

Fig 2: Checking Harness And Connector (Transponder Key ECU Assembly - Body Ground)

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR

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