Trouble Shooting

NOTE: Before proceeding with trouble shooting, check multiplex system for faults. See MULTIPLEX CONTROL SYSTEMS - LS400 article. If no faults are found in multiplex system, proceed with trouble shooting.

Ensure all component terminals and ground connections are clean and tight. Check possible faults in order listed. See SYMPTOM DIAGNOSIS table. Repair or replace components and/or circuits as necessary.

SYMPTOM DIAGNOSIS

Symptom

Inspect

All Windows Inoperative

⁽¹⁾ PWS Circuit
⁽²⁾ Master Switch Circuit
⁽³⁾ Body Control ECU

Individual Window Inoperative

⁽²⁾ Master Switch Circuit
⁽⁴⁾ Window Motor Circuit
⁽³⁾ Driver Door ECU

AUTO UP/DOWN Inoperative

⁽²⁾ Master Switch Circuit
⁽³⁾ Driver Door ECU

Jam Protection & AUTO UP/DOWN Inoperative

⁽⁵⁾ Jam Protection Limit Switch Circuit
⁽⁶⁾ Jam Protection Pulse Switch Circuit
⁽³⁾ Driver Door ECU

Windows Inoperative When Using Master Switch

All Windows Inoperative

⁽³⁾ Body Control ECU
⁽⁷⁾ Master Switch
⁽⁸⁾ Open Or Shorted Wire Harness

All Windows Inoperative (Except Driver's)

⁽⁷⁾ Master Switch
⁽⁸⁾ Open Or Shorted Wire Harness

Single Window Inoperative (Auto & Manual Function)

⁽⁹⁾

Single Window Inoperative (Auto Function)

⁽⁷⁾ Master Switch
⁽¹⁰⁾ Passenger's Switch
⁽³⁾ Door ECU
⁽⁸⁾ Open Or Shorted Wire Harness

Windows (Except Driver's) Inoperative From Master Switch (Individual Switch Operation Normal)

All Windows Inoperative

⁽⁷⁾ Master Switch

Front Passenger's Window Completely Inoperative

⁽³⁾ Driver Door ECU
⁽⁷⁾ Master Switch
⁽⁸⁾ Open Or Shorted Wire Harness

Front Passenger's Window UP, DOWN Or AUTO DOWN Inoperative

⁽⁷⁾ Master Switch

Right Rear Passenger's Window Completely Inoperative

⁽³⁾ Driver Door ECU
⁽⁷⁾ Master Switch
⁽⁸⁾ Open Or Shorted Wire Harness

Right Rear Passenger's Window UP, DOWN Or AUTO DOWN Inoperative

⁽⁷⁾ Master Switch

Left Rear Passenger's Window Completely Inoperative

⁽³⁾ Driver Door ECU
⁽⁷⁾ Master Switch
⁽⁸⁾ Open Or Shorted Wire Harness

Left Rear Passenger's Window UP, DOWN Or AUTO DOWN Inoperative

⁽⁷⁾ Master Switch

Window UP Inoperative (All Passenger's Windows)

⁽⁷⁾ Master Switch
⁽³⁾ Driver Door ECU
⁽⁸⁾ Open Or Shorted Wire Harness

Window UP Inoperative (Individual Window)

⁽⁷⁾ Master Switch

Window DOWN Inoperative (All Passenger's Windows)

⁽⁷⁾ Master Switch
⁽³⁾ Driver Door ECU
⁽⁸⁾ Open Or Shorted Wire Harness

Window DOWN Inoperative (Individual Window)

⁽⁷⁾ Master Switch

Window AUTO DOWN Inoperative (All Passenger's Windows)

⁽⁷⁾ Master Switch
⁽³⁾ Driver Door ECU
⁽⁸⁾ Open Or Shorted Wire Harness

Window AUTO DOWN Inoperative (Individual Window)

⁽⁷⁾ Master Switch

Door Key Window Function Inoperative (Master Switch Operation Normal)

Door Key Lock & Window Functions Inoperative

⁽³⁾

Door Key Window Function Inoperative (Door Key Lock Operation Normal)

⁽¹¹⁾

Windows Inoperative Using Multi-Remote Transmitter (Master Switch Operation Normal)

Remote Operation of Door Lock & Luggage Compartment Inoperative

⁽¹²⁾

Only Remote Operation Of Luggage Compartment Operates Normally

Check Wireless Door Lock Transmitter

Remote Operation Of Door Lock & Luggage Compartment Operates Normally

⁽¹¹⁾

Window Switches To Down Operation During Up Operation

Window Begins Down Operation After Window Reaches Fully Closed Position

⁽¹³⁾ Window Motor Limit Switch Adjustment
⁽³⁾ Driver Door ECU

Window Begins Down Operation During Up Operation

⁽¹⁴⁾

⁽¹⁾	See PWS CIRCUIT under CIRCUIT TESTS.

⁽²⁾	See MASTER SWITCH CIRCUIT under CIRCUIT TESTS.

⁽³⁾	See BODY CONTROL SYSTEMS - LS400 article.

⁽⁴⁾	See WINDOW MOTOR CIRCUIT under CIRCUIT TESTS.

⁽⁵⁾	See JAM PROTECTION LIMIT SWITCH CIRCUIT under CIRCUIT TESTS.

⁽⁶⁾	See JAM PROTECTION PULSE SWITCH CIRCUIT under CIRCUIT TESTS.

⁽⁷⁾	See MASTER SWITCH under COMPONENT TESTS.

⁽⁸⁾	See WIRING DIAGRAMS.

⁽⁹⁾	See SINGLE WINDOW INOPERATIVE (AUTOMATIC & MANUAL OPERATION) under SYMPTOM TESTS.

⁽¹⁰⁾	See PASSENGER'S SWITCH under COMPONENT TESTS.

⁽¹¹⁾	See MULTIPLEX CONTROL SYSTEMS - LS400 article.

⁽¹²⁾	See POWER DOOR LOCKS, TRUNK LID & FUEL DOOR RELEASE article.

⁽¹³⁾	See WINDOW MOTOR LIMIT SWITCH under ADJUSTMENTS.

⁽¹⁴⁾	See WINDOW BEGINS DOWN OPERATION DURING UP OPERATION under SYMPTOM TESTS.