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lexpert
lexpert, Lexus Master tech
Category: Lexus
Satisfied Customers: 9974
Experience:  Master Certified with lexus, 8 years experience with Lexus
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1993 lexus: 4 door v8 has a problem with the dash instruments

Resolved Question:

my 1993 lexus 4 door v8 has a problem with the dash instruments. They come on, but not until the engine is hot or, if it's a hot day. what could cause this?
Submitted: 7 years ago.
Category: Lexus
Expert:  marcpod replied 7 years ago.
Welcome to just answer. What is the model?
Expert:  lexpert replied 7 years ago.

This is a major and common issue on the 1993-1995 LS400.

What happens is the printed circuit board in the instrument cluster develops a hairline crack on the circuit board and as heat/cold causes the part to expand and contract the circuit opens and closes a complete circuit.

Long story short here the solution is to replace the circuit board. This is a dealer specific part and several undred dollars just for the part, to replace requires cluster removal and complete tear down. The retainer screws and internal components of this cluster are very sensitive and fragile (very similar to disassembling a complex computer) and should only be done so by qualified and trained technicians that are familiar with these units.

lexpert, Lexus Master tech
Category: Lexus
Satisfied Customers: 9974
Experience: Master Certified with lexus, 8 years experience with Lexus
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