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.

NOTE:

When replacing the tire pressure warning ECU and receiver, read the IDs stored in the ECU using the Techstream and note them down before removal.
It is necessary to perform initialization (See INITIALIZATION ) after registration (See REGISTRATION ) of the transmitter IDs into the tire pressure warning ECU and receiver if the ECU and/or one of the valve and transmitters have been replaced.

CHECK WIRE HARNESS AND CONNECTOR (TIRE PRESSURE WARNING ECU - TIRE PRESSURE ANTENNA)

Disconnect the tire pressure warning ECU and receiver J49 connector and tire pressure warning antenna A38 and Q29 connectors

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

HINT.

Because the coaxial cable that is used for the tire pressure warning antenna consists of a center conductor and an outer shielding layer (-), this measurement should be performed to ensure that there is no malfunction in the coaxial cable

Standard Resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
A38-1 (ANFR) - J49-8 (ANT2)	Always	Below 1 Ω
Q29-1 (ANRL) - J49-9 (ANT3)	Always	Below 1 Ω
A38-1 (shielded wire) - J49-8 (shielded wire)	Always	Below 1 Ω
Q29-1 (shielded wire) - J49-9 (shielded wire)	Always	Below 1 Ω
A38-1 (ANFR) - A38-1 (shielded wire)	Always	10 kΩ or higher
Q29-1 (ANRL) - Q29-1 (shielded wire)	Always	10 kΩ or higher

Fig 1: Identifying Terminals Of Tire Pressure Warning ECU And Receiver J49 And Tire Pressure Warning Antenna A38 And Q29 Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

INSPECT TIRE PRESSURE WARNING ANTENNA

Disconnect the tire pressure warning antenna A38 and Q29 connectors.

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

HINT.

Coaxial cable is used for the antenna

Standard Resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
A38-1 (antenna cable core) - Shielded wire	Always	Below 1 Ω
Q29-1 (antenna cable core) - Shielded wire	Always	Below 1 Ω

Fig 2: Identifying Terminals Of Tire Pressure Warning Antenna A38 And Q29 Connectors

NG: REPLACE TIRE PRESSURE WARNING ANTENNA (See REMOVAL )

OK: Go to next step

CHECK DTC

Check for a Test Mode DTC (See TEST MODE PROCEDURE )

Result

RESULT REFERENCE

Condition	Proceed to
DTC C2195/95 is output	A
DTC C2195/95 is not output	B

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

B: END