Toyota Corolla Cross: Diagnosis System
DIAGNOSIS SYSTEM
DESCRIPTION
The main body ECU (multiplex network body ECU) and certification ECU (smart key
ECU assembly) control the LIN communication system. LIN communication system data
and Diagnostic Trouble Codes (DTCs) can be read through the Data Link Connector
3 (DLC3).
When the system seems to be malfunctioning, use the GTS to check for malfunctions
and perform repairs.
CHECK DLC3
(a) Check the DLC3.
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INSPECT AUXILIARY BATTERY VOLTAGE
(a) Measure the auxiliary battery voltage with the ignition switch off.
Standard Voltage:
11 to 14 V
If the voltage is below 11 V, recharge or replace the auxiliary battery.
READ NEXT:
DATA LIST / ACTIVE TEST
DATA LIST
NOTICE:
In the table below, the values listed under "Normal Condition" are reference
values. Do not depend solely on these reference values when decidi
DIAGNOSTIC TROUBLE CODE CHART
LIN Communication System
DTC No.
Detection Item
Link
B120687
P/W Master SW System Missing Message
DESCRIPTION
This DTC is stored when LIN communication between the main body ECU (multiplex
network body ECU) and multiplex network master switch assembly, front power window
regulator motor assem
SEE MORE:
ON-VEHICLE INSPECTION PROCEDURE
1. INSPECT VACUUM SENSOR ASSEMBLY (a) Connect the GTS to the DLC3.
(b) Start the engine. (c) Turn the ignition switch off. (d) Turn the ignition switch to ON.
(e) Turn the GTS on. (f) Enter the following menus: Powertrain / Stop and Start / Data List / Brake Boo
INSPECTION PROCEDURE 1. INSPECT FRONT DOOR AMBIENT LIGHT LH (FRONT DOOR TRIM BOARD SUB-ASSEMBLY LH)
(a) Check the illumination.
(1) Apply auxiliary battery voltage to the front door ambient light LH (front door trim board sub-assembly LH) and check that the light illuminates.
OK:
