1990LS400

For the past several years the keyless entry in my 90 LS400 has functioned only in winter. It now functions only when the temperature is below about 32Fº. The colder the weather, the more reliably the keyless entry works. My guess is that the keyless entry stops working as the interior temperature of the car rises although I have never tried leaving the heater off to verify this and it is a long time until winter.

My local repair shop is baffled and does not seem to really want to chase electrical problems. Any ideas?

The A/C in my 90 LS400 was recently converted to R134a by a non-dealer Lexus repair shop for about $200 (US) including charging and seems to be providing plenty of cold air in current 100+ Kansas temperatures.

Wow! Yesterday (July 5) in 100+ degree Kansas City weather, my 90 LS400 started exhibiting this exact same problem with the "R" (reverse) dash light coming on whenever I pressed the brake pedal while the shift level was in "D" (drive) and with irregular shifts between gears.

And for the past three years or so, the "light out" indicator in the instrument cluster had frequently illuminated even thought no exterior lights were out. My local non-dealer repair shop tried several times to trouble shoot to no avail.

The solution from Lextek was exactly correct. This morning I found that, while the insulation for the "white with black stripe" ground wire was still intact, it was obvious that the wire core had broken at the point where the wire makes that 360 degree turn in the trunk lid hinge. What a quick fix for a nagging problem!

Thanks for the help!!! We still love this car after 13 years of ownership.