Inspection Procedure

WARNING: This page is about a different car, the 2008 Lexus IS F. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT BATTERY
1. Check the battery voltage.
  Standard Voltage: 11 to 14 V
NG: RECHARGE OR REPLACE BATTERY

OK: Go to next step

INSPECT FUSE (ECU-IG LH)

Remove the ECU-IG LH fuse from the cowl side junction block LH

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

Standard Resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
ECU-IG LH Fuse	Always	Below 1 Ω

Fig 1: Identifying ECU-IG LH Fuse

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE FUSE

OK: Go to next step

INSPECT TIRE PRESSURE WARNING ECU AND RECEIVER

Remove the tire pressure warning ECU and receiver with the connectors being connected
Turn the engine switch on (IG)

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

Standard Voltage

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Switch Condition	Specified Condition
J49-1 (IG) - J49-6 (GND)	Engine switch on (IG)	10 to 16 V

Fig 2: Identifying Terminals Of Pressure Warning ECU And Receiver Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: Go to step 4

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

CHECK HARNESS AND CONNECTOR (BATTERY - TIRE PRESSURE WARNING ECU AND RECEIVER)

Disconnect the tire pressure warning ECU and receiver J49 connector
Turn the engine switch on (IG)

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

Standard Voltage

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Switch Condition	Specified Condition
J49-1 (IG) - Body ground	Engine switch on (IG)	10 to 16 V

Fig 3: Identifying Terminals Of Pressure Warning ECU And Receiver J49 Connector

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

CHECK HARNESS AND CONNECTOR (TIRE PRESSURE WARNING ECU AND RECEIVER - BODY GROUND)

Disconnect the tire pressure warning ECU and receiver J49 connector

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

Standard Resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
J49-6 (GND) - Body ground	Always	Below 1 Ω

Fig 4: Identifying Terminals Of Pressure Warning ECU And Receiver J49 Connector

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER (See REMOVAL )