Toyota Corolla Cross: Back Door Courtesy Switch Circuit
DESCRIPTION
The main body ECU (multiplex network body ECU) receives a back door open/closed signal from the back door courtesy light switch (back door lock assembly).
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Before replacing the main body ECU (multiplex network body ECU), refer to Registration.*1
for HEV Model: Click here .gif)
for Gasoline Model: Click here
- *1: w/ Smart Key System
PROCEDURE
|
1. | READ VALUE USING GTS |
(a) Read the Data List according to the display on the GTS.
Body Electrical > Main Body > Data List|
Tester Display | Measurement Item |
Range | Normal Condition |
Diagnostic Note |
|---|---|---|---|---|
|
Back Door Courtesy Switch Status |
Back door courtesy switch signal |
CLOSE or OPEN | CLOSE: Back door closed OPEN: Back door open |
- |
|
Tester Display |
|---|
| Back Door Courtesy Switch Status |
OK:
Normal conditions listed above are displayed.
| OK | .gif) | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
|
.gif)
| 2. |
INSPECT BACK DOOR COURTESY LIGHT SWITCH (BACK DOOR LOCK ASSEMBLY) |
Click here
| NG | | REPLACE BACK DOOR COURTESY LIGHT SWITCH (BACK DOOR LOCK ASSEMBLY) |
|
| 3. |
CHECK HARNESS AND CONNECTOR (BACK DOOR COURTESY LIGHT SWITCH (BACK DOOR LOCK ASSEMBLY) - POWER DISTRIBUTION BOX ASSEMBLY AND BODY GROUND) |
(a) Disconnect the 8F power distribution box assembly connector.
(b) Disconnect the U42 multiplex network door ECU connector.*1
- *1: w/ Power Back Door System
(c) Measure the resistance according to the value (s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
U4-3 (D+) - 8F-2 | Always |
Below 1 Ω |
|
U4-2 (ACT-) - Body ground |
Always | Below 1 Ω |
|
U4-3 (D+) - Body ground |
Always | 10 kΩ or higher |
|
8F-2 - Body ground | Always |
10 kΩ or higher |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 4. |
INSPECT POWER DISTRIBUTION BOX ASSEMBLY |
|
*a | Component without harness connected (Power Distribution Box Assembly) |
- | - |
(a) Remove the main body ECU (multiplex network body ECU) from the power distribution box assembly.
Click here
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
8F-2 - MB-19 (BCTY) | Always |
Below 1 Ω |
| OK | | REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
| NG | | REPLACE POWER DISTRIBUTION BOX ASSEMBLY |
READ NEXT:
Interior Light Circuit
DESCRIPTION The main body ECU (multiplex network body ECU) controls the operation of the following lights:
Map Light Assembly
Room Light Assembly
WIRING DIAGRAM
CAUTION / NOTICE / HINT
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DESCRIPTION The main body ECU (multiplex network body ECU) controls operation of the DOME CUT relay in order to supply power to the interior lights. When the battery saving function operates while the
Ambient Illumination Light Circuit
DESCRIPTION The main body ECU (multiplex network body ECU) controls the operation of the following lights:
Center tray illumination light (No. 1 interior illumination light assembly)
Front D
SEE MORE:
How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT
HINT:
Use the following procedure listed to troubleshoot the Dynamic Torque Control
AWD System.
*: Use the GTS.
PROCEDURE
1.
VEHICLE BROUGHT TO WORKSHOP
NEXT
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