Inspect Power Window Master Switch Illumination

WARNING: This page is about a different car, the 2003 Lexus GS 430 and 2003 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.

Set the window lock switch to the unlock position.
Connect the positive (+) lead from the battery to terminal 15 and the negative (-) lead to terminal 16, and check that all the illuminations light up.
Connect the positive (+) lead from the voltmeter to terminal 15 and negative (-) lead to terminal 2, and check that the voltage meter needle indicates battery positive voltage.

Fig 1: Inspecting Power Window Master Switch Illumination (1 Of 2)
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Set the window lock switch to the lock position, check that all the passenger's power window switch illuminations go out.
Then, check that the voltage meter needle indicates no voltage.

If operation is not as specified, replace the master switch.

Fig 2: Inspecting Power Window Master Switch Illumination (2 Of 2)