Toyota 4Runner: Problem Symptoms Table

Toyota 4Runner Service Manual / Vehicle Interior / Door Lock / Power Door Lock Control System / Problem Symptoms Table

PROBLEM SYMPTOMS TABLE

HINT:

Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
Inspect the fuses and relays related to this system before inspecting the suspected areas below.

Power Door Lock Control System

Symptom	Suspected Area	See page
No Door Lock/Unlock Functions Operate Via Master Switch or Driver Side Door Key Cylinder	Proceed to "All Doors LOCK/UNLOCK Functions Operate Via Master Switch or Driver Side Door Key Cylinder"
Only Driver Door Lock/Unlock Functions do not Operate	Front door lock assembly LH
	Harness or connector	-
	Main body ECU (Multiplex network body ECU)	-
	Driver side junction block assembly	-
Only Passenger Door Lock/Unlock Functions do not Operate	Front door lock assembly RH
	Harness or connector	-
	Main body ECU (Multiplex network body ECU)	-
	Driver side junction block assembly	-
Only Rear Door LH Lock/Unlock Functions do not Operate	Rear door lock assembly LH
	Harness or connector	-
	Main body ECU (Multiplex network body ECU)	-
	Driver side junction block assembly	-
Only Rear Door RH Lock/Unlock Functions do not Operate	Rear door lock assembly RH
	Harness or connector	-
	Main body ECU (Multiplex network body ECU)	-
	Driver side junction block assembly	-
Only Back Door cannot be Operated	Proceed to "Only Back Door cannot be Operated"

Initialization

INITIALIZATION 1. PROCEDURES NECESSARY WHEN CABLE IS DISCONNECTED/RECONNECTED TO BATTERY TERMINAL NOTICE: After the battery is reconnected, be sure to wait 10 seconds or more before att ...

Terminals Of Ecu

TERMINALS OF ECU 1. CHECK DRIVER SIDE JUNCTION BLOCK ASSEMBLY AND MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) (a) Remove the main body ECU (multiplex network body ECU) (See page ). (b) Measure ...

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If a warning light turns on or a warning buzzer sounds
Calmly perform the following actions if any of the warning lights comes on or flashes. If a light comes on or flashes, but then goes off, this does not necessarily indicate a malfunction in the system. However, if this continues to occur, have the vehicle ...