Trouble Shooting

NOTE: Prior to trouble shooting, ensure no problems exist in multiplex communications. If problems exist, repair multiplex control system before trouble shooting. See appropriate MULTIPLEX CONTROL SYSTEMS article.

NOTE: Check circuits and components in listed order. If circuits or components are okay, return to trouble shooting and identify next circuit to be checked.

SYMPTOM DIAGNOSIS (DOOR LOCK CONTROL SYSTEM)

Problem

Inspect

Lock Or Unlock Cannot Be Operated With Door Lock Control Switch

⁽²⁾ Driver Door ECU
⁽²⁾ Passenger Door ECU
⁽³⁾ Body Control ECU

Door Key Link Function Does Not Operate

⁽²⁾ Driver Door ECU
⁽²⁾ Passenger Door ECU
⁽³⁾ Body Control ECU

Key Confinement Prevention Function Does Not Operate

⁽¹⁾ Key Unlock Warning Switch Circuit
⁽³⁾ Body Control ECU

⁽¹⁾	Perform appropriate circuit test under CIRCUIT TESTS . If more than one circuit test is listed, perform tests in order listed.

⁽²⁾	See appropriate wiring diagram in POWER DOOR LOCKS, TRUNK LID & FUEL DOOR RELEASE article.

⁽³⁾	Perform BODY CONTROL ECU PIN VOLTAGE TESTS under COMPONENT TESTS.

SYMPTOM DIAGNOSIS (WIRELESS DOOR LOCK CONTROL SYSTEM)

Problem

Inspect

Wireless Door Lock Control System Does Not Operate

⁽¹⁾ Wireless Door Lock Transmitter
⁽²⁾ Wireless Door Lock Tuner Circuit
⁽²⁾ Key Unlock Warning Switch Circuit
⁽³⁾ Body Control ECU

Lock Or Unlock Function Does Not Operate

⁽²⁾ Driver Door Unlock Detection Switch Circuit
⁽²⁾ Passenger Door Unlock Detection Switch Circuit
⁽²⁾ Left Rear Door Unlock Detection Switch Circuit
⁽²⁾ Right Rear Door Unlock Detection Switch Circuit
⁽⁴⁾ Driver Door ECU
⁽⁴⁾ Passenger Door ECU
⁽⁴⁾ Left Rear Door ECU
⁽⁴⁾ Right Rear Door ECU
⁽³⁾ Body Control ECU

Auto Lock Function Operates When Any Door Is Opened Within 30 Seconds After Unlocking All Doors With Wireless Door Lock Control System

⁽²⁾ Driver Door Courtesy Light & Courtesy Switch Circuit
⁽²⁾ Passenger Door Courtesy Light & Courtesy Switch Circuit
⁽²⁾ Left Rear Door Courtesy Light & Courtesy Switch Circuit
⁽²⁾ Right Rear Door Courtesy Light & Courtesy Switch Circuit
⁽⁴⁾ Driver Door ECU
⁽⁴⁾ Passenger Door ECU
⁽⁴⁾ Left Rear Door ECU
⁽⁴⁾ Right Rear Door ECU
⁽³⁾ Body Control ECU

Wireless Door Lock Operates, But Buzzer Does Not Sound

⁽²⁾ Wireless Door Lock Buzzer Circuit
⁽³⁾ Body Control ECU

Buzzer Sounds, But Wireless Door Lock Function Does Not Operate

⁽³⁾ Body Control ECU

⁽¹⁾	Check transmitter operation.

⁽²⁾	Perform appropriate circuit test under CIRCUIT TESTS . If more than one circuit test is listed, perform tests in order listed.

⁽³⁾	Perform BODY CONTROL ECU PIN VOLTAGE TESTS under COMPONENT TESTS.

⁽⁴⁾	See appropriate wiring diagram in POWER DOOR LOCKS, TRUNK LID & FUEL DOOR RELEASE article.

SYMPTOM DIAGNOSIS (ANTI-THEFT SYSTEM)

Problem

Inspect

System Cannot Be Set

⁽¹⁾ Anti-Theft Indicator Circuit
⁽¹⁾ Key Unlock Warning Switch Circuit
⁽¹⁾ Driver Door Courtesy Light & Courtesy Switch Circuit
⁽¹⁾ Passenger Door Courtesy Light & Courtesy Switch Circuit
⁽¹⁾ Left Rear Door Courtesy Light & Courtesy Switch Circuit
⁽¹⁾ Right Rear Door Courtesy Light & Courtesy Switch Circuit
⁽¹⁾ Driver Door Unlock Detection Switch Circuit
⁽¹⁾ Passenger Door Unlock Detection Switch Circuit
⁽¹⁾ Left Rear Door Unlock Detection Switch Circuit
⁽¹⁾ Right Rear Door Unlock Detection Switch Circuit
⁽¹⁾ Engine Hood Courtesy Switch Circuit
⁽¹⁾ Back Door Courtesy Switch Circuit
⁽²⁾ Driver Door ECU
⁽²⁾ Passenger Door ECU
⁽²⁾ Left Rear Door ECU
⁽²⁾ Right Rear Door ECU
⁽³⁾ Body Control ECU

System Cannot Be Canceled When Ignition Is In ON Position

⁽¹⁾ Key Unlock Warning Switch Circuit
⁽⁴⁾ Ignition Switch Circuit
⁽³⁾ Body Control ECU

System Does Not Cancel When Back Door Is Opened With Key

⁽¹⁾ Back Door Key Lock & Unlock Switch Circuit
⁽³⁾ Body Control ECU

Headlights Do Not Operate Properly With System

⁽¹⁾ Headlight Relay Circuit
⁽³⁾ Body Control ECU

Taillights Do Not Operate Properly With System

⁽¹⁾ Taillight Relay Circuit
⁽³⁾ Body Control ECU

Anti-Theft Horn & Standard Horn Does Not Sound

⁽¹⁾ Anti-Theft Horn Circuit
⁽¹⁾ Standard Horn Circuit
⁽³⁾ Body Control ECU

Hazards Do Not Operate Properly With System

⁽¹⁾ Hazard Switch Circuit
⁽³⁾ Body Control ECU

During Warning Condition, System Cannot Be Canceled By Unlocking Door With Key

⁽¹⁾ Driver Door Key Lock & Unlock Switch Circuit
⁽¹⁾ Passenger Door Key Lock & Unlock Switch Circuit
⁽²⁾ Driver Door ECU
⁽²⁾ Passenger Door ECU
⁽³⁾ Body Control ECU

During Warning Condition, System Cannot Be Canceled By Unlocking Door With Transmitter

⁽⁵⁾ Wireless Door Lock Transmitter
⁽¹⁾ Wireless Door Lock Tuner Circuit
⁽³⁾ Body Control ECU

During Warning Condition, System Cannot Be Canceled By Turning Ignition To ACC Or ON Position Using Key

⁽⁴⁾ Ignition Switch Circuit
⁽¹⁾ Key Unlock Warning Switch Circuit
⁽³⁾ Body Control ECU

Horns Sounded For More Than 60 Seconds

⁽³⁾ Body Control ECU

⁽¹⁾	Perform appropriate circuit test under CIRCUIT TESTS . If more than one circuit test is listed, perform tests in order listed.

⁽²⁾	See appropriate wiring diagram in POWER DOOR LOCKS, TRUNK LID & FUEL DOOR RELEASE article.

⁽³⁾	Perform BODY CONTROL ECU PIN VOLTAGE TESTS under COMPONENT TESTS.

⁽⁴⁾	Check ignition switch. See STEERING COLUMN SWITCHES article.

⁽⁵⁾	Check transmitter operation.

SYMPTOM DIAGNOSIS (REAR WIPER/WASHER SYSTEM)

Problem

Inspect

Rear Wipers Do Not Operate

⁽¹⁾ Wiper/Washer Switch Circuit
⁽¹⁾ Rear Wiper Motor Circuit
⁽²⁾ Body Control ECU

Rear Washers Do Not Operate

⁽¹⁾ Wiper/Washer Switch Circuit
⁽¹⁾ Rear Washer Motor Circuit
⁽³⁾ Wiring Harness

⁽¹⁾	Perform appropriate circuit test under CIRCUIT TESTS . If more than one circuit test is listed, perform tests in order listed.

⁽²⁾	Perform BODY CONTROL ECU PIN VOLTAGE TESTS under COMPONENT TESTS.

⁽³⁾	Check wiring harness for opens or shorts. See WIRING DIAGRAMS in appropriate WIPER/WASHER SYSTEMS article. Repair or replace as necessary, and retest system operation.

SYMPTOM DIAGNOSIS (LIGHT CONTROL SYSTEM)

Problem

Inspect

Automatic Light Control Does Not Operate

⁽¹⁾ Light Sensor Circuit
⁽¹⁾ Headlight Control Switch Circuit
⁽²⁾ Body Control ECU

Automatic Turn Off Does Not Operate

⁽¹⁾ Driver Door Courtesy Switch Circuit
⁽³⁾ Ignition Switch
⁽²⁾ Driver Door ECU
⁽⁴⁾ Body Control ECU

⁽¹⁾	Perform appropriate circuit test under CIRCUIT TESTS . If more than one circuit test is listed, perform tests in order listed.

⁽²⁾	See appropriate wiring diagram in POWER DOOR LOCKS, TRUNK LID & FUEL DOOR RELEASE article.

⁽³⁾	Check ignition switch. See STEERING COLUMN SWITCHES article.

⁽⁴⁾	Perform BODY CONTROL ECU PIN VOLTAGE TESTS under COMPONENT TESTS.

SYMPTOM DIAGNOSIS (ILLUMINATED ENTRY CONTROL SYSTEM)

Problem

Inspect

Illuminated Entry Does Not Operate Properly

⁽¹⁾ Illumination Circuit
⁽²⁾ Body Control ECU

⁽¹⁾	Perform appropriate circuit test under CIRCUIT TESTS . If more than one circuit test is listed, perform tests in order listed.

⁽²⁾	Perform BODY CONTROL ECU PIN VOLTAGE TESTS under COMPONENT TESTS.

SYMPTOM DIAGNOSIS (MISCELLANEOUS)

Problem

Inspect

A/C Control Panel & Multi Display Does Not Deteriorate

⁽¹⁾ Rheostat Light Control Circuit
⁽²⁾ Body Control ECU

Body Control ECU Does Not Operate

⁽¹⁾ ECU Power Source Circuit
⁽²⁾ Body Control ECU

⁽¹⁾	Perform appropriate circuit test under CIRCUIT TESTS . If more than one circuit test is listed, perform tests in order listed.

⁽²⁾	Perform BODY CONTROL ECU PIN VOLTAGE TESTS under COMPONENT TESTS.