Toyota Corolla Cross: Power Back Door Warning System does not Operate
DESCRIPTION
When the power back door warning system does not operate, one of the following may be malfunctioning: 1) wireless door lock control system, 2) power back door warning buzzer circuit, 3) multiplex network door ECU.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
- If the replacement, removal and installation of the multiplex network door ECU or disconnection of the connectors of the multiplex network door ECU has been performed, initialize the power back door system.
Click here
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- The power back door warning function can be customized. Make sure the function is ON.
Click here
- If the main body ECU (multiplex network body ECU) is replaced, refer to Registration.
for HEV Model: Click here
for Gasoline Model: Click here
PROCEDURE
|
1. | CHECK OPERATION |
(a) Check power back door system operation.
Click here
|
Result | Proceed to |
|---|---|
|
Hazard warning light does not come on |
A |
| Power back door warning buzzer does not operate |
B |
| B |
.gif) | GO TO STEP 6 |
|
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| 2. |
CHECK WIRELESS DOOR LOCK CONTROL SYSTEM (HAZARD ANSWER-BACK FUNCTION) |
(a) Check wireless door lock operation.
Click here
OK:
Hazard answer-back function operates normally.
| NG | | GO TO WIRELESS DOOR LOCK CONTROL SYSTEM |
|
| 3. |
REPLACE MULTIPLEX NETWORK DOOR ECU |
(a) Temporarily replace the multiplex network door ECU with a new or normally functioning one.
Click here
|
| 4. |
INITIALIZE MULTIPLEX NETWORK DOOR ECU |
(a) Perform the initialization for the multiplex network door ECU.
Click here
|
| 5. |
CHECK POWER BACK DOOR SYSTEM |
(a) Check that the power back door hazard warning lights operate normally.
Click here
OK:
The power back door hazard warning lights operate normally.
| OK | | END (MULTIPLEX NETWORK DOOR ECU WAS DEFECTIVE) |
| NG | | REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
| 6. |
PERFORM ACTIVE TEST USING GTS |
(a) Perform the Active Test according to the display on the GTS.
Body Electrical > Back Door > Active Test|
Tester Display | Measurement Item |
Control Range | Diagnostic Note |
|---|---|---|---|
|
PBD Buzzer (Small Volume) |
Power back door warning buzzer sound (small volume) |
Start | - |
|
PBD Buzzer (Middle Volume) |
Power back door warning buzzer sound (Middle volume) |
Start | - |
|
PBD Buzzer (Large Volume) |
Power back door warning buzzer sound (Large volume) |
Start | - |
|
Tester Display |
|---|
| PBD Buzzer (Small Volume) |
|
Tester Display |
|---|
| PBD Buzzer (Middle Volume) |
|
Tester Display |
|---|
| PBD Buzzer (Large Volume) |
OK:
Power back door warning buzzer sounds.
| OK | | REPLACE MULTIPLEX NETWORK DOOR ECU |
|
| 7. |
CHECK HARNESS AND CONNECTOR (POWER BACK DOOR WARNING BUZZER - MULTIPLEX NETWORK DOOR ECU AND BODY GROUND) |
(a) Disconnect the U23 power back door warning buzzer connector.
(b) Disconnect the U39 multiplex network door ECU connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
U23-1 (BZR+) - U39-1 (BZR+) |
Always | Below 1 Ω |
|
U23-2 (BZR-) - Body ground |
Always | Below 1 Ω |
|
U23-1 (BZR+) or U39-1 (BZR+) - Body ground |
Always | 10 kΩ or higher |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 8. |
REPLACE POWER BACK DOOR WARNING BUZZER |
(a) Temporarily replace the power back door warning buzzer with a new or normally functioning one.
Click here
|
| 9. |
CHECK POWER BACK DOOR SYSTEM |
(a) Check that the power back door warning buzzer operates normally.
Click here
OK:
Power back door warning buzzer sounds.
| OK | | END (POWER BACK DOOR WARNING BUZZER WAS DEFECTIVE) |
| NG | | REPLACE MULTIPLEX NETWORK DOOR ECU |
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