Section 391 (Audio & Visual System): Inspection

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

INSPECT MAIN SWITCH ASSY

Inspect the continuity between terminals at each switch position shown in the chart.

SPECIFIED TESTER CONDITION

Switch operation	Tester connection	Specified condition
OFF	3 <=> 4	No continuity
ON	3 <=> 4	Continuity

If continuity is not as specified, replace the main switch assy.

Fig 1: Inspect Main Switch Assembly Connector

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Inspect the bulb state when connecting the battery to each terminal.

BATTERY SPECIFIED CONDITION

Inspection item	Battery connection	Specified condition
Indicator	Battery positive terminal <=> 3 Battery negative terminal <=> 6	Comes on
Illumination	Battery positive terminal <=> 1 Battery negative terminal <=> 2	Comes on

If operation is not as specified, check the faulty bulb.

Inspect continuity of the bulb by connecting the tester as shown in the illustration.

If continuity exists, replace the main switch assy.

If no continuity exists, replace the bulb.

Fig 2: Inspecting Continuity Of Bulb By Connecting Tester

INSPECT POWER POINT SOCKET RELAY

Inspect continuity between terminals according to the conditions in the chart.

SPECIFIED TESTER CONDITION

Condition	Tester connection	Specified condition
Always	1 <=> 2	Continuity
Always	3 <=> 5	No continuity
Apply B+ between terminal 1 and 2	3 <=> 5	Continuity

If continuity is not as specified, replace the point socket relay.

Fig 3: Inspecting Power Point Socket Relay Connector