Every torque figure, clearance and service specification in this manual is tied to the 1990 Lexus LS 400 as Lexus built it that year, right down to the 4.0L V8 (1UZ-FE) and the Base trim, rather than a close-enough number carried over from an adjacent model year.
Engines
- 4.0L V8 GAS Naturally Aspirated
Trims
- Base
Known issues on the 1990 LS 400. One recall is on federal record for this model year, filed under exterior lighting and the brake light switch: the lamp housing of the center high mounted stop lamp could become distorted after prolonged illumination, particularly under high temperatures. Owners have filed 24 complaints for the year, and Lexus has issued no technical service bulletins for it. The diagnostic and repair procedures behind that exterior lighting system are here.
Whether you are chasing a stop-lamp fault, servicing the 4.0L V8, or following a scheduled maintenance interval, it keeps you on the OEM procedure and the correct specification for this 1990 LS 400.
LAMP HOUSING OF CENTER HIGH MOUNTED STOP LAMP COULD BECOME DISTORTED AFTER PROLONGED ILLUMINATION, PARTICULARLY UNDER HIGH TEMPERATURES.
REPLACE LAMP HOUSING WITH ONE OF HIGHER TEMPERATURE RESISTANT MATERIAL.
Lexus Safety Recall and Service Campaign - Technician Certification Requirements 4.13.2022
POL: This consolidated Tire Warranty Guide contains the complete warranty terms for all brands of ground and spare tires currently in use by Lexus. This information must be kept near the point of vehicle sale and be available to any custome
Brake Pedal Force Gauge SST for Parking Brake Inspection.
Auto matic Transmission Replacement kPrecautions
Windshield Wiper Blade Maintenance and cleaning
Safety Recall and Service Campaign - Technician Certification Requirements
TSB: SUPERSESSION NOTICE The information contained in this bulletin supersedes Service Bulletin Nos. L-SB-0048-08, PG007-07, PG016-01, PG015-01, PG004-97, PG003-97, PG003-93, PG002-90, L-SB-0048-08, PG007-07, PG016-01, PG015-01, PG004-97, P
TSB: OBSOLETE NOTICE April 06, 2020: This bulletin is now obsolete. Please see L-SB-0008-20. Replacement Certification Labels and VIN Plates
Showing the 8 most recent of 25 technical service bulletins on file with NHTSA.
CONSUMER STATED WHILE TRAVELING AT 30 MPH, ANOTHER VEHICLE RAN A LIGHT AND THE CONSUMER HIT THE VEHICLE. CONSUMER'S VEHICLE WAS TOTALED. THE DRIVER SIDE AIRBAG DID NOT DEPLOYED. THE PASSENGERS NECK AND BACK WAS INJURED AS A RESULT. PASSENGERS WERE WEARING SEAT BELTS. *PH *TS *JB
WHILE DRIVING 30MPH ANOTHER VEHICLE PULLED IN FRONT OF CONSUMER, AND CONSUMER REARENDED VEHICLE. CONSUMER'S AIRBAG DIDNOT DEPLOY.*AK
SPEED WAS ABOUT 20-35 MPH. ENGINE RACED AND CAR SURGED FORWARD INTO CAR AH EAD, PUSHING THE CAR AHEAD FORWARD. BRAKING WAS VERY DIFFICULT. THE AIR BAG DID NOT DEPLOY. MY MECHANIC INSPECTED THE CAR AND FOUND THAT THE TRANSMISSION MOUNT BRACKET WAS SHEARED IN TWO WHICH CAUSED THE TRANSMISSION TO SHIFT FORWARD ACCELERATING THE CAR.
AIR BAG DEPLOYMENT WAS VIOLENT, RESULTING IN AN INJURY. *AK
WHEN DRIVER SWERVED TO AVOID HITTING A ANIMAL IN THE ROAD, THE VEHICLE CRASHED INTO A TELEPHONE POLE HEAD-ON, AND THE DRIVER'S SIDE AIR BAG DID NOT DEPLOY. THE VEHICLE IS BEING REPAIRED. *AK
BRAKES FAILED, CAUSING ACCIDENT. *SD
THE ENGINE CAUGHT ON FIRE WHILE THE VEHICLE WAS PARKED. CAUSE UNKNOWN. PLEASE DESCRIBE. TT
I HAVE A 1990 LEXUS LS 400 AND I HAVE HAD TO CHANGE MY ALTERNATOR AND POWER STEERING PUMP 3 TIMES DUE TO THE POWER STEERING PUMP HAVING A LEAK AND THERE ARE MILLIONS HAVING THE SAME PROBLEM AND IT COST A LOT OF MONEY I THINK LEXUS SHOULD HAVE RECALLED THEIR PUMPS TO CORRECT THIS PROBLEM PLEASE HELP ME THIS IS BECOMING RIDICULOUS. EVERY YEAR I HAVE TO CHANGE MY PUMP DUE TO THIS PROBLEM THEY COST 600 DOLLARS JUST THE PART SOMEONE SHOULD TAKE SOME KIND OF NOTICE TO THIS MAJOR PROBLEM. *TR
WHEN CLOSING THE FRONT DOORS THE HANDLE SEPARATED FROM THE FRAME.*AK
S10 APPROPRIATE HANDLING - ENCLOSING AN AGENDA REPORT SERVICE HISTORY MAY 2014 - MAY/JUNE 2016 ON BLACK 1990 LEXUS LS 400. *SMD THE CONSUMER STATED EACH TIME THE REPAIR SHOP PERFORMED SERVICES ON HER VEHICLE, IT LED TO ANOTHER PROBLEM(S). A CLAMP WAS MISSING. A WIRE LEFT DANGLING, A HOSE WAS NOT PLACED ON CORRECTLY OR IT WAS THE WRONG HOSE AND/OR A GOOD HOSE WAS TORN, BROKEN OR TATTERED. A SCREW WAS LEFT MISSING. A PART OR COMPONENT WAS NOT PUT IN PROPERLY. THE CONSUMER STATED SHE WAS AFRAID T
MY CAR, MADE BY TOYOTA, HAS ALL THE SAME PROBLEMS, FAULTY PARTS, AS THE CARS THAT WERE RECALLED FOR SUDDEN ACCELERATION. I HAVE HAD THE SUDDEN ACCELERATION PROBLEM HAPPEN TWICE AND I AM CURRENTLY UNABLE TO DRIVE THE CAR BECAUSE OF A FAULTY RESISTOR THAT CONTROLS THE FUEL FEED TOT THE FUEL PUMP KEEPS CAUSING THE CAR TO ACT LIKE IT IS RUNNING OUT OF GAS. VERY DANGEROUS. LEXUS HAS REFUSED TO FIX IT EVEN THOUGH I AM WILLING TO PAY. THEY WANT NOTHING TO DO WITH CARS WITH THE SAME PARTS AS SUDDEN
IN APPROXIMATELY 1995, I EXPERIENCED THE "SUDDEN ACCELERATION" PROBLEM TWICE WITH MY LEXUS LS. AT THE TIME, NO ONE HAD EVER HEARD OF IT AND THE DEALER SAID HE COULD NOT REPRODUCE IT AND COULD DO NOTHING. AFTER THAT I WAS MORE CAREFUL WITH THE FLOOR MATS AND THOUGHT I HAD SOLVED THE PROBLEM. FOR THE LAST 7 TO 8 YEARS, THE CAR SUDDENLY SLOWS AND STALLS. I HAVE REPEATEDLY COMPLAINED TO NEW COUNTRY LEXUS BUT THEY JUST SAY THAT THEY CANNOT REPRODUCE THE PROBLEM AND DON'T KNOW WHAT IT IS.
BENDS AFTER DRIVING ON A CROWN ROAD......3X.....BCP IN SMYRNA DE WILL NOT GIVE ME ANOTHER CHANGED LEFT AND RIGHT TIE ROD ENDS TWIICE AND STILL CANNOT KEEP THE VEHICLE ON THE ROAD.
INSTRUMENT PANEL LIGHTS DON'T WORK (SPEEDOMETER) ON 90 LEXUS LS400. APPARENTLY IT'S HAPPENED TO ALL OF THEM OR IS HAPPENING TO ALL OF THEM. COST $2000 TO REPAIR! NOT SAFE DRIVING WITHOUT SEEING SPEED. (ENTIRE CLUSTER IS ELECTRONIC SO CAN'T SEE EVEN IN DAYLIGHT.*AK
TL* THE CONTACT OWNS A 1990 LEXUS LS400. THE CONTACT STATED THAT THE FRONT DRIVERS SIDE DOOR FAILED TO UNLOCK FROM THE INSIDE OR OUTSIDE OF THE VEHICLE. THE CONTACT ATTEMPTED BOTH AUTOMATICALLY AND MANUALLY BUT THE DOOR FAILED TO UNLOCK AND OPEN. THE CONTACT STATED THAT HE HAD NO ALTERNATIVE BUT TO EXIT THROUGH THE PASSENGERS SIDE DOOR. THE VEHICLE WAS TAKEN TO A DEALER WHERE THE FAILURE WAS UNABLE TO BE REPLICATED. THE MANUFACTURER WAS NOT NOTIFIED OF THE FAILURE. THE VEHICLE WAS NOT REPAIRED
Showing the 15 most serious of 24 complaints filed with NHTSA.
