Inspection Procedure

WARNING: This page is about a different car, the 2004 Lexus LX 470. However, it is still accessible from the selected car via links, so may be relevant.

Check voltage between terminals B1, ACC, IG and GND of multi-display assembly.

Disconnect the connector from the multi-display assembly.

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

Standard:

MULTI-DISPLAY ASSEMBLY B1, ACC, IG AND GND TERMINALS VOLTAGE

Tester connection	Condition	Specified condition
B1 - GND1	Always	10 to 14 V
ACC - GND1	Ignition SW ACC	10 to 14 V
IG - GND1	Ignition SW ON	10 to 14 V

Fig 1: Checking Voltage Between Terminals B1, ACC, IG And GND Of Multi-Display Assembly

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OK: Proceed to next circuit inspection shown in. (See PROBLEM SYMPTOMS TABLE
NG

Check continuity between terminal GND1 of multi-display assembly and body ground.

Disconnect the connector from the multi-display assembly.

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

Standard:

MULTI-DISPLAY ASSEMBLY GND1 TERMINAL AND BODY GROUND RESISTANCE

Tester connection	Condition	Specified condition
GND1 - Body ground	Always	Below 1 Ω

Fig 2: Checking Continuity Between Terminal GND1 Of Multi-Display Assembly And Body Ground

OK: Repair or replace harness or connector between navigation ECU and fuse.
NG: Repair or replace harness or connector between navigation ECU and body ground.