Inspection Procedure

WARNING: This page is about a different car, the 2007 Lexus GX 470. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT FUSE (ACC, ECU-IG, RADIO NO. 2)

Disconnect the ACC and ECU-IG fuses from the driver side junction block.
Disconnect the RADIO NO. 2 fuse from the engine room relay block.

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

Standard resistance

FUSE (ACC, ECU-IG, RADIO NO. 2)

Tester Connection	Condition	Specified Condition
ACC fuse	Always	Below 1 Ω
ECU-IG fuse	Always	Below 1 Ω
RADIO NO. 2 fuse	Always	Below 1 Ω

NG: REPLACE FUSE

OK: Go to Next Step

INSPECT RELAY (Marking: ACC CUT)

Disconnect the ACC CUT relay from the engine room relay block.

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

Standard resistance

RELAY (MARKING: ACC CUT)

Tester Connection	Condition	Specified Condition
3 - 4	Always	Below 1 Ω
3 - 4	Battery voltage is applied to terminals 1 - 2	10 kΩ or higher

Fig 1: Identifying Relay (Marking: ACC CUT)

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NG: REPLACE RELAY

OK: Go to Next Step

CHECK HARNESS AND CONNECTOR (MULTI-DISPLAY - BATTERY AND BODY GROUND)

Disconnect the M21 display connector.

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

Standard resistance

MULTI-DISPLAY - BATTERY AND BODY GROUND RESISTANCE

Tester Connection	Condition	Specified Condition
M21-1 (GND1) - Body ground	Always	Below 1 Ω

Fig 2: Identifying Harness & Connector (Multi-Display - Battery & Body Ground)

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

Standard voltage

MULTI-DISPLAY - BATTERY AND BODY GROUND VOLTAGE

Tester Connection	Switch Condition	Specified Condition
M21-3 (+B1) - Body ground	Always	11 to 14 V
M21-2 (ACC) - Body ground	Ignition switch ACC	11 to 14 V
M21-10 (IG) - Body ground	Ignition switch ON	11 to 14 V

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

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