Toyota Yaris: Lighting System / Parking Brake Switch Circuit
DESCRIPTION
The main body ECU (multiplex network body ECU) detects the condition of the parking brake switch assembly.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Before replacing the main body ECU (multiplex network body ECU), refer to Registration.
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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 |
|---|---|---|---|---|
| Parking Brake Switch | Parking brake switch signal | Release or Lock | Release: Parking brake released Lock: ON: Parking brake applied | - |
| Tester Display |
|---|
| Parking Brake Switch |
OK:
Normal conditions listed above are displayed.
| OK |
.gif) | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
|
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| 2. | INSPECT PARKING BRAKE SWITCH ASSEMBLY |
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| NG |
| REPLACE PARKING BRAKE SWITCH ASSEMBLY |
|
| 3. | CHECK HARNESS AND CONNECTOR (PARKING BRAKE SWITCH ASSEMBLY - POWER DISTRIBUTION BOX ASSEMBLY) |
(a) Disconnect the 4B power distribution box assembly connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| H37-1 (+) - 4B-13 | Always | Below 1 Ω |
| H37-1 (+) or 4B-13 - 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.
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(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| 4B-13 - MB-21 (PKB) | Always | Below 1 Ω |
| OK |
| REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
| NG |
| REPLACE POWER DISTRIBUTION BOX ASSEMBLY |
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CAUTION / NOTICE / HINT NOTICE:
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CAUTION / NOTICE / HINT NOTICE:
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Turning the Engine Off
Stop the vehicle completely. Manual transaxle: Shift into neutral and set the parking brake.Automatic transaxle: Shift the selector lever to the P position and set the parking brake.
Press the push button start to turn off the engine. The ignition position is off.