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System Trouble Shooting

NOTE: Body Electronic Control Unit (ECU) is connected to multiplex communication system. Ensure no faults exist in multiplex communication system before performing trouble shooting.

Trouble shooting is available for the following systems: anti-theft, automatic light control, illuminated entry, keyless entry, power door locks and rear wiper/washer. Determine under what conditions that system does not operate or malfunctions and then perform specified test(s) listed under SYSTEM TESTS . If more than one circuit is to be inspected, perform tests in order listed. See appropriate TROUBLE SHOOTING SYMPTOMS table.

TROUBLE SHOOTING SYMPTOMS (ANTI-THEFT SYSTEM)

Problem (1) Circuit To Be Inspected Go To Test No.
Anti-Theft System Cannot Be Set
SECURITY Indicator Light Circuit (2)
Key Unlock Warning Switch Circuit 9 
Door Courtesy Switch Circuit 12 
Door Unlock Detection Switch Circuit 14 
Engine Hood Courtesy Switch Circuit (2)
Body ECU 18 
Alarm Sounds For More Than 60 Seconds
Body ECU 18 
(1) If more than one circuit is to be inspected, perform test on each circuit in the order listed.
(2) See appropriate ANTI-THEFT SYSTEMS article for test procedure.
TROUBLE SHOOTING SYMPTOMS (AUTOMATIC LIGHT CONTROL SYSTEM)

Problem (1) Circuit To Be Inspected Go To Test No.
Auto Turn-Off Function Does Not Operate
Driver's Door Courtesy Switch Circuit 12 
Ignition Switch Power Source 2 
Body ECU 18 
(1) If more than one circuit is to be inspected, perform test on each circuit in the order listed.
TROUBLE SHOOTING SYMPTOMS (ILLUMINATED ENTRY SYSTEM)

Problem (1) Circuit To Be Inspected Go To Test No.
Illuminated Entry System Inoperative
Illumination Circuit 3 
Body ECU 18 
(1) If more than one circuit is to be inspected, perform test on each circuit in the order listed.
TROUBLE SHOOTING SYMPTOMS (KEYLESS ENTRY SYSTEM)

Problem (1) Circuit To Be Inspected Go To Test No.
All Keyless Entry System Functions Inoperative
Transmitter (2)
Key Unlock Warning Switch Circuit 9 
Wireless Door Lock ECU (2)
Body ECU (3)
Lock Or Unlock Function Inoperative
Door Key Lock & Unlock Switch Circuit 15 
Door Unlock Detection Switch Circuit 14 
Body ECU 18 
Automatic Lock Function (4)
Door Courtesy Switch Circuit 12 
Body ECU 18 
(1) If more than one circuit is to be inspected, perform test on each circuit in the order listed.
(2) See appropriate KEYLESS ENTRY SYSTEMS article.
(3) Substitute a known-good door lock ECU and retest.
(4) Automatic lock function operates even if any door is opened within 30 seconds after all doors are unlocked with keyless remote.
TROUBLE SHOOTING SYMPTOMS (POWER DOOR LOCK SYSTEM)

Problem (1) Circuit To Be Inspected Go To Test No.
Lock Or Unlock Won't Operate W/Door Lock Control Switch
Door Lock Control Switch Circuit 11 
Body ECU 18 
Doors Do Not Unlock Properly When Using Key
Door Key Lock & Unlock Switch Circuit 15 
Body ECU 18 
Doors Lock With Key In Ignition
Key Unlock Warning Switch Circuit 9 
Body ECU 18 
(1) If more than one circuit is to be inspected, perform test on each circuit in the order listed.
TROUBLE SHOOTING SYMPTOMS (REAR WIPER/WASHER SYSTEM)

Problem (1) Circuit To Be Inspected Go To Test No.
Rear Wiper Inoperative
Rear Wiper Switch Circuit 4 
Rear Wiper Motor Circuit 5 
Body ECU 18 
Rear Washer Inoperative
Rear Washer Switch Circuit 4 
Rear Washer Motor (2)
Rear Wiper Does Not Only On High Speed
Body ECU 18 
Rear Wiper Does Not Work W/Washer Switch ON
Rear Wiper Switch Circuit 4 
Body ECU 18 
(1) If more than one circuit is to be inspected, perform test on each circuit in the order listed.
(2) See WIPER/WASHER SYSTEMS article for testing of rear washer motor. If rear washer motor is okay, check for defective wiring harness.
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