Toyota CH-R Service Manual: Problem Symptoms Table

Toyota CH-R Service Manual / Theft Deterrent / Keyless Entry / Theft Deterrent System / Problem Symptoms Table

PROBLEM SYMPTOMS TABLE

NOTICE:

Before replacing the main body ECU (multiplex network body ECU), refer to REGISTRATION*1.
Click here

*1: w/ Smart Key System
When replacing the combination meter assembly, always replace it with a new one. If a combination meter assembly which was installed to another vehicle is used, the information stored in it will not match the information from the vehicle and a DTC may be stored.

HINT:

Troubleshooting of the theft deterrent system is based on the premise that the power door lock control system and the wireless door lock control system are operating normally. Accordingly, before troubleshooting the theft deterrent system, first make certain that the power door lock control system and the wireless door lock control system are operating normally.
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.

Theft Deterrent System

Symptom	Suspected Area	Link
Theft deterrent system cannot be set	Immobiliser system (w/ Smart Key System)" security indicator light does not blink"
	Immobiliser system (w/o Smart Key System)" security indicator light does not blink"
	ACC signal circuit
	IG signal circuit
	Door unlock detection switch circuit
	Door courtesy switch circuit
	Back door courtesy switch circuit
	Engine hood courtesy switch circuit
	Unlock warning switch circuit (w/o Smart Key System)
	If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the main body ECU (multiplex network body ECU)
Security indicator light does not blink when theft deterrent system is set	Immobiliser system (w/ Smart Key System)" security indicator light does not blink"
	Immobiliser system (w/o Smart Key System)" security indicator light does not blink"
Theft deterrent system cannot be unset by turning the engine on.	Replace the main body ECU (multiplex network body ECU)
Theft deterrent system can be set even when door is open	Door courtesy switch circuit
	Back door courtesy switch circuit
	If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the main body ECU (multiplex network body ECU)
Theft deterrent system can be set even when hood is open	Engine hood courtesy switch circuit
Vehicle horns do not sound while theft deterrent system is in alarm sounding state	Horn circuit
Hazard warning lights do not flash while theft deterrent system is in alarm sounding state	Combination meter assembly
	If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the main body ECU (multiplex network body ECU)
Security horn does not sound while theft deterrent system is in alarm sounding state	Security horn circuit
Hazard warning lights flash even when theft deterrent system is not set	Combination meter assembly
	If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the main body ECU (multiplex network body ECU)
The vehicle does not enter the alarm sounding state as the battery is reconnected	Check the battery
	Power Source Circuit
The warning sounds itself	Improper Operation

Customize Parameters

CUSTOMIZE PARAMETERS CUSTOMIZE THEFT DETERRENT SYSTEM NOTICE: When the customer requests a change in a function, first make sure that the function can be customized. Be sure to make ...

Terminals Of Ecu

TERMINALS OF ECU CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY AND MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) *A Main Body ECU (Multiplex Network Body ECU) with 2 Connecto ...

Other materials:

Toyota CH-R Service Manual > Pre-collision System: Brake System Malfunction (C1A50)
DESCRIPTION When the pre-collision system is operating, the millimeter wave radar sensor assembly sends brake control signals to the skid control ECU (brake actuator assembly). When the millimeter wave radar sensor assembly receives a VSC system malfunction signal from the skid control ECU (br ...

Toyota CH-R Service Manual > Windshield Deicer System: How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT HINT: Use the following procedure to troubleshoot the windshield deicer system. *: Use the Techstream. PROCEDURE 1. VEHICLE BROUGHT TO WORKSHOP NEXT ...

Toyota CH-R Service Manual: Problem Symptoms Table

Customize Parameters

Terminals Of Ecu

Other materials:

Toyota C-HR (AX20) 2023-2025 Owner's Manual

Toyota CH-R Owners Manual

Toyota CH-R Service Manual