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 |
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WIRING DIAGRAM
CAUTION / NOTICE / HINT
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SEE MORE:
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Software Update
SOFTWARE UPDATE
CAUTION / NOTICE / HINT
HINT:
After replacing the forward recognition camera due to a system malfunction,
make sure to perform "Software Update".
The software of the forward recognition camera is always updated
to the latest software via wireless communication using
