Toyota Corolla Cross: System Description
SYSTEM DESCRIPTION
CXPI COMMUNICATION SYSTEM DESCRIPTION
(a) The multiplex communication system [CXPI] is used for communication systems between body system components. When communication fails due to an open circuit, etc. on the communication line, the function that outputs a DTC related to the circuit according to the control master ECU and the fail-safe function that maintains minimum performance and protects the system activate. (The following shows the communication system and connected ECUs.)
HINT:
- Each component has a fail-safe function which activates to maintain the minimum performance of the system and protect the system.
- In the following table, "○" indicates that the function applies, and "-" indicates that it does not.
|
Component |
Master Control |
CXPI Communication DTC Output Function |
|---|---|---|
|
Main body ECU (multiplex network body ECU) |
○ |
Output function enabled |
|
Power distribution box assembly |
- |
Output function disabled |
|
Windshield wiper relay assembly |
- |
Output function disabled |
|
Headlight assembly RH*1 |
- |
Output function disabled |
|
Headlight assembly LH*1 |
- |
Output function disabled |
- *1: for LED Type Parking Light without AFS
LOAD OPERATION OUTPUT
(a) Controls the load on and off based on multiplex communication signals.
|
Load |
Power distribution box assembly |
Supports operation signal communication |
|---|---|---|
|
Rear Window Defogger |
○ |
Supported |
|
Back-up Light |
○ |
Supported |
|
Dome Cut |
○ |
Supported |
|
Tail Light |
○ |
Supported |
|
Seat Heater*1 |
○ |
Supported |
|
Front Fog Light*2 |
○ |
Supported |
|
Panel Illumination |
○ |
Supported |
|
Passenger Seat Buckle Switch Delegated Input |
○ |
Not supported |
|
Passenger Seat Occupant Detection Sensor Delegated Input |
○ |
Not supported |
|
Rear Seat RH Buckle Switch Delegated Input |
○ |
Not supported |
|
Rear Seat CTR Buckle Switch Delegated Input |
○ |
Not supported |
|
Rear Seat LH Buckle Switch Delegated Input |
○ |
Not supported |
|
IGR Relay*3 |
○ |
Not supported |
|
+BA Relay |
○ |
Not supported |
- *1: w/ Fog Light
- *2: w/ Seat Heater System
- *3: w/o Smart Key System
READ NEXT:
How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT
HINT:
Use these procedures to troubleshoot the CXPI communication system.
*: Use the GTS.
PROCEDURE
1.
VEHICLE BROUGHT TO WORKSHOP
Terminals Of Ecu
TERMINALS OF ECU
NOTICE:
After the ignition switch is turned off, there may be a waiting time before
disconnecting the negative (-) auxiliary battery terminal.
Click here
When disconn
Fail-safe Chart
FAIL-SAFE CHART
CXPI COMMUNICATION FAIL-SAFE
(a) When there is a CXPI communication malfunction (communication stop), each
load operates as follows.
Power distribution box assembly
Lo
SEE MORE:
Parts Location
PARTS LOCATION
ILLUSTRATION
*1
FORWARD RECOGNITION CAMERA
*2
ELECTRIC BRAKE BOOSTER (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY)
*3
SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY)
*4
HEADLAMP ECU SUB-ASSEMB
Problem Symptoms Table
PROBLEM SYMPTOMS TABLE
NOTICE:
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 su
