Last Modified: 05-13-2024 |
6.11:8.1.0 |
Doc ID: RM100000001GLYU |
Model Year Start: 2020 |
Model: GR Corolla |
Prod Date Range: [01/2019 - 09/2022] |
Title: LIGHTING (EXT): LIGHTING SYSTEM (for Gasoline Model with AFS): Taillight Relay Circuit; 2020 - 2022 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 09/2022] |
DESCRIPTION
The main body ECU (multiplex network body ECU) controls the operation of the TAIL relay.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
PROCEDURE
1.
|
PERFORM ACTIVE TEST USING TECHSTREAM
|
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Main Body / Active Test.
(e) Perform the Active Test according to the display on the Techstream.
Body Electrical > Main Body > Active Test
Tester Display
|
Measurement Item
|
Control Range
|
Diagnostic Note
|
Taillight Relay
|
Taillight relay
|
OFF or ON
|
-
|
Body Electrical > Main Body > Active Test
Tester Display
|
Taillight Relay
|
OK:
Taillights illuminate.
NG
|
|
|
2.
|
CHECK HARNESS AND CONNECTOR (POWER SOURCE - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)
|
(a) Disconnect the 4D 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
|
4D-1 - Body ground
|
Always
|
11 to 14 V
|
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
OK
|
|
|
3.
|
INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
|
*a
|
Component without harness connected
(Instrument Panel Junction Block Assembly)
|
-
|
-
|
(a) Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.
Click here
(b) Connect a positive (+) lead from the battery to terminal 4D-1.
(c) Connect a negative (-) lead from the battery to terminal MB-14 (TRLY).
(d) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
|
Condition
|
Specified Condition
|
4F-11 - Battery negative (-) terminal
|
Always
|
11 to 14 V
|
4B-32 - Battery negative (-) terminal
|
Always
|
11 to 14 V
|
4A-30 - Battery negative (-) terminal
|
Always
|
11 to 14 V
|
|