(1990-1994?) 1995-2000 LS400 employs a rotary potentiometer to adjust backlight brightness of instrument cluster/meter, climate control and radio display.

Some side play and rotary slop in the D-shaft that the control **** plugs onto.

A very simple fix is to replace affixing nut of the potentiometer with an APM-Hexseal rotary shaft seal. P.N. 1332/39 to apply rotary tension on the shaft to achieve feel of a precision potentiometer.


The lower cluster bezel assembly with potentiometer brightness control ****.


Backside depicting female connector and mounting screws.

Potentiometer removed from bezel. Potentiometer shown with jam nut that will be replaced with rotary shaft seal with insert molded nut.

APM-Hexseal rotary shaft seal 1332/39.with correct M7 X 0.75 metric threads.

Am removing the secondary sealing lip from the base of the rotary shaft seal nut because it is not necessary, I require the clearance, and because the nut must ground the wire lug below OEM nut to the bushing.

A side-by-side comparison of APM-Hexseal part and OEM jamb nut. Secondary seal at base of nut to be removed.

Have removed back cover of brighnrss control assembly to better illustrate fit of the APM part inside the **** cavity.. Here **** is not pushed in all the way.

Backside of control **** depicting casting flash that must be removed to allow clearance for APM nut assembly.

After molding flash removed with an exacto knife and slight radius applied to inside cavity and lower lip.of ****, it slips right over the APM nut.


Applied Toyota Rubber Grease to rotary shaft and seal lips to facilitate APM insertion over shaft and smooth rotation.




Available and in stock at Mouser Electronics.



The fix worked as planned. The **** turns in a more precision fashion, albeit with more rotary force required.

 

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