1996 Lexus SC 400FACTORY OEM SERVICE PROCEDURE

System Testing: Notes

NOTE: Unless specified otherwise, use a DVOM with a minimum input impedance of 10-megohms. For electrical component locations, see ELECTRICAL COMPONENT LOCATIONSΒ  under DESCRIPTION & OPERATION.

Identify symptom and perform corrective action as necessary. See appropriate SYSTEM TESTS INDEX & TROUBLE SHOOTING GUIDEΒ  table.

SYSTEM TESTS INDEX & TROUBLE SHOOTING GUIDE

Component Symptom Action Or Fig. No.
All Meters, Gauges & Lights No Display At All See Figure
" 4 Indicator Needles Do Not Illuminate Replace Circuit Plate
" One Indicator Needle Does Not Illuminate See Figure
" Entire Character Plate Does Not Illuminate Replace Circuit Plate
" Character Plate Not Illuminated At One Or More Locations See Figure
" Brightness Does Not Change With Lights In OFF Or TAIL See Figure
" Brightness Does Not Change When Rheostat Is Turned See Figure
" Brightness Remains Dim With Light Switch OFF Replace Circuit Plate
" Brightness Does Not Go Out When Starter Is Operated See Figure
Speedometer Does Not Operate While Driving See Figure
" Display Is Faulty Replace Meter Lens
" Vehicle Speed Signal (4P) Faulty See Figure
Tachometer Does Not Operate While Engine Is Running See Figure
" Display Is Faulty Replace Meter Lens
Fuel Gauge Does Not Operate Or Operation Is Abnormal See Figure
Fuel Level Warning Warning Does Not Illuminate Or Always Illuminated See Figure
Engine Coolant Temp. Gauge Does Not Operate Or Operation Is Abnormal See Figure
Odometer & Twin Trip Meter Display Does Not Change While Driving See Figure
Twin Trip Meter Display Is Reset When Ignition Turned Off See Figure
" Abnormal Display Replace Odo & Twin Trip Meter
Outside Air Temp. Display Abnormal Display See Figure
Engine Oil Level Warning Warning Does Not Illuminate See Figure
" Warning Always Illuminated See Figure
Transmission PWR Indicator Abnormal Operation Or Indicator Does Not Illuminate See Figure
CRUISE MAIN Indicator Abnormal Operation Or Indicator Does Not Illuminate See Figure
O/D OFF Indicator Abnormal Operation Or Indicator Does Not Illuminate See Figure
Shift Position Indicator Abnormal Operation Or Indicator Does Not Illuminate See Figure
TRAC OFF Indicator Abnormal Operation Or Indicator Does Not Illuminate See Figure
ABS Warning Abnormal Operation Or Warning Does Not Illuminate See Figure
Hi-Beam Indicator Abnormal Operation Or Indicator Does Not Illuminate See Figure
Turn Signal Indicator Abnormal Operation Or Indicator Does Not Illuminate See Figure
Window Washer Warning Abnormal Operation Or Warning Does Not Illuminate See Figure
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.

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