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.

CHECK HARNESS AND CONNECTOR (OVERHEAD JUNCTION BLOCK - MULTI-DISPLAY)

Disconnect the overhead junction block connector and multi-display connector.

Fig 1: Identifying Terminals Of Overhead Junction Block Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Standard Resistance

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Condition	Specified Condition
R5-15 (ACC) - J51-9 (MACC)	Always	Below 1 Ω
R5-16 (MI1+) - J51-11 (MIN+)	Always	Below 1 Ω
R5-17 (MIC-) - J51-10 (MIN-)	Always	Below 1 Ω
J51-5 (TSW-) - J51-12 (SGND)	Always	Below 1 Ω
R5-15 (ACC) - Body ground	Always	10 kΩ or higher
R5-16 (MI1+) - Body ground	Always	10 kΩ or higher
R5-17 (MIC-) - Body ground	Always	10 kΩ or higher

Fig 2: Identifying Terminals Of Multi-Display Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to Next Step

INSPECT MULTI-DISPLAY

Reconnect the multi-display connector.

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

Standard Voltage

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Switch Condition	Specified Condition
J51-9 (MACC) - Body ground	Engine switch on (ACC)	4 to 6 V

Fig 3: Identifying Terminals Of Multi-Display Connector

NG: REPLACE MULTI-DISPLAY (See REMOVAL )

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