Last Modified: 07-31-2024 |
6.11:8.1.0 |
Doc ID: RM1000000026A7T |
Model Year Start: 2023 |
Model: GR Corolla |
Prod Date Range: [09/2022 - 11/2022] |
Title: THEFT DETERRENT / KEYLESS ENTRY: THEFT DETERRENT SYSTEM (for TMMMS Made): Power Source Circuit; 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022] |
DESCRIPTION
Based on changes in the power source voltage, the main body ECU (multiplex network body ECU) can detect if the auxiliary battery has been disconnected and reconnected.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
PROCEDURE
1.
|
CHECK HARNESS AND CONNECTOR (POWER SUPPLY)
|
(a) Disconnect the 4B instrument panel junction block assembly connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
|
Condition
|
Specified Condition
|
4B-1 - Body ground
|
Always
|
8.5 V or higher
|
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
OK
|
|
|
2.
|
INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
|
(a) Remove the main body ECU (multiplex network body ECU).
Click here
*a
|
Component without harness connected
(Instrument Panel Junction Block Assembly)
|
-
|
-
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
4B-1 - MB-31 (BECU)
|
Always
|
Below 1 Ω
|
|