Toyota Corolla Cross: System Description
SYSTEM DESCRIPTION
IMMOBILISER SYSTEM DESCRIPTION
The immobiliser system is designed to prevent the vehicle from being stolen. This system uses the transponder key ECU assembly that stores the key ID codes of authorized ignition keys. If an attempt is made to start the engine using an unauthorized door control transmitter assembly, the transponder key ECU assembly sends a signal to the ECM to prohibit fuel delivery and ignition, effectively disabling the engine.
FUNCTION OF MAIN COMPONENTS
|
Component | Outline |
|---|---|
|
Transponder key ECU assembly |
|
| Transponder key coil |
When a door control transmitter assembly is inserted into the ignition key cylinder, the transponder key amplifier receives the key ID code from the transponder chip in the door control transmitter assembly grip and outputs it to the transponder key ECU assembly. |
|
ECM | The ECM receives key ID code verification results from the transponder key ECU assembly. The ECM also verifies the ECUs. Then judgment of whether to immobilise the engine is made. |
|
Unlock warning switch assembly | The unlock warning switch assembly detects if the door control transmitter assembly is in the ignition key cylinder and outputs the result to the transponder key ECU assembly. |
SYSTEM FUNCTION
(a) When the transponder key ECU assembly detects that the unlock warning switch assembly is on, the transponder key ECU assembly applies current to the transponder key coil and produces a magnetic field around the antenna coil. A transponder chip in the door control transmitter assembly grip outputs a key ID code signal using electromotive force generated by the magnetic field. The transponder key coil receives the signal and sends it to the transponder key ECU assembly. The transponder key ECU assembly checks if the key ID code received from the transponder key coil matches the registered key ID code.
When the engine is started, the ECM communicates with the transponder key ECU assembly and checks the door control transmitter assembly verification result. In addition, the ECM checks if the engine ID codes stored in the transponder key ECU assembly and ECM match. If they do not match, the ECM prohibits engine start.
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How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT
HINT:
Use the following procedure to troubleshoot the immobiliser system.
*: Use the GTS.
PROCEDURE
1. VEHICLE BROUGHT TO WORKSHOP
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Registration
REGISTRATION PROCEDURE 1. REPAIR INSTRUCTION
NOTICE: PRECAUTION WHEN REPLACING PARTS
Code registration is necessary when any of the following parts is replaced with a new one. After replacing a
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
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Camera "A" Heater Control Circuit Short to Battery or Open (C00CA15)
DESCRIPTION
Forward recognition camera controls the current to the windshield
glass (heater). Forward recognition camera stores DTC C00CA15 when it detects a
malfunction in the drive circuit of the windshield glass (heater).
DTC No.
Detection Item
DTC Detection
Inspection
INSPECTION
PROCEDURE
1. INSPECT REAR DRIVE SHAFT ASSEMBLY
(a) Check that there is no excessive play in the radial direction of
the outboard joint.
(b) Check that the inboard joint slides smoothly in the thrust direction.
(c) Check that th
