Repair manual
Lexus LS I Repair Manual
Step-by-step repair and maintenance instructions for the Lexus LS I (1989–1994): removal, installation, adjustment, diagnostics and parameter checks with illustrations.
- INTRODUCTION
- CONTROL UNIT
- ES250 POWER CIRCUITS
- ES250 GROUND CIRCUITS
- LS400 GROUND CIRCUITS
- AIRFLOW METER AIR TEMPERATURE SENSOR RESISTANCE
- ES250 AIRFLOW METER MEASURING PLATE RESISTANCE
- ES250 CLUTCH START SWITCH
- NEUTRAL START SWITCH
- THROTTLE POSITION SENSOR (TPS)
- CIRCUIT OPENING RELAY
- EFI MAIN RELAY
- STARTER RELAY
- FUEL CONTROL SYSTEM
- FUEL CUT SYSTEM
- FUEL PRESSURE CONTROL SYSTEM
- IGNITION COILS SYSTEM
- ADVANCE COMPONENTS
- VACUUM MODULATOR CHECK
- ES250 BIMETALLIC VACUUM SWITCHING VALVE
- LS400 VACUUM SWITCHING VALVE
- EVAP CANISTER
- BIMETALLIC VACUUM SWITCHING VALVE
- EVAP VACUUM CONTROL VALVE (LS400)
- PCV VALVE
- DASHPOT
- A/C CLUTCH CONTROL
- A/C CLUTCH RELAY CONTROL
- LS400 A/C PRESSURE SWITCH
- ES250 COOLING FAN ECU
- ES250 WATER TEMPERATURE SENSOR
- LS400 WATER TEMPERATURE SWITCH
- ES250 & LS400 ENGINE MAIN & LS400 COOLING FAN RELAY NO. 3
- COOLING FAN RELAY NO. 1 (ES250 & LS400) & NO. 2 (LS400)
- ES250 COOLING FAN RELAY NO. 2
- ES250 COOLING FAN RELAY NO. 3
- COOLING FAN MOTORS NO. 1 & NO. 2
- FAILURE SYMPTOMS & CIRCUIT TESTS
- ES250 THEFT DETERRENT ECU POWER CIRCUIT TEST
- LS400 THEFT DETERRENT ECU POWER CIRCUIT TEST
- ES250 THEFT DETERRENT IGNITION SWITCH CIRCUIT TEST
- LS400 THEFT DETERRENT IGNITION SWITCH CIRCUIT TEST
- ES250 THEFT DETERRENT KEY UNLOCK WARNING SWITCH CIRCUIT TEST
- LS400 THEFT DETERRENT KEY UNLOCK WARNING SWITCH CIRCUIT TEST
- ES250 THEFT DETERRENT STARTER CUT SYSTEM CIRCUIT TEST
- LS400 THEFT DETERRENT STARTER CUT SYSTEM CIRCUIT TEST
- LS400 THEFT DETERRENT ECU OPERATION TEST
- LS400 THEFT DETERRENT ECU GROUND CIRCUIT TEST
- CIRCUIT DIAGNOSIS CHARTS (LS400)
- EFI ECU TERMINAL IDENTIFICATION
- CIRCUIT DIAGNOSIS CHARTS
- DESCRIPTION & OPERATION
- Power Seat Switch
- Lumbar Support Switch
- Slide & Vertical Switch
- Front Vertical, Rear Vertical, Lumbar Support, Reclining & Headrest Motor
- Seat Heater Switch
- Seat Heater Relay
- Seat Heater
- PRELIMINARY INSPECTION
- POWER SEAT CONTROL SYSTEM
- FRONT SEATS
- SEAT HEATER SYSTEM
- Continuity
- Circuit
- Operation
- Circuit Breaker Operation
- Switch Circuit
- Operation (Driver's Seat)
- Operation (Passenger's Seat)
- Circuit Breaker Operation (Driver's Seat)
- Circuit Breaker Operation (Passenger's Seat)
- Continuity (Seat Cushion)
- Continuity (Seat Back)
- Indicator
- Continuity (Driver's Side)
- Circuit (Front Seat Right Wire Harness Side)
- Circuit (Floor Wire Harness)
- Continuity (Passenger's Side)
- Circuit (Front Seat Right Wire Harness Slide)
- Operation (Slide Motor)
- Circuit Breaker Operation (Slide Motor)
- Operation (Front Vertical Motor)
- Circuit Breaker (Front Vertical Motor)
- Operation (Rear Vertical Motor)
- Circuit Breaker Operation (Rear Vertical Motor)
- REMOVAL & INSTALLATION
- Removal
- Disassembly
- Reassembly
- Installation
