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 |
LO-beam Headlight does not Illuminate
DESCRIPTION The main body ECU (multiplex network body ECU) controls the low beam headlights. WIRING DIAGRAM
CAUTION / NOTICE / HINT NOTICE:
Before replacing the main body ECU (multiplex network body ECU), refer to Registration...
Taillight Relay Circuit
DESCRIPTION The main body ECU (multiplex network body ECU) controls the, taillight and license plate light. WIRING DIAGRAM
CAUTION / NOTICE / HINT NOTICE:
First perform the communication function inspections in How to Proceed with Troubleshooting to confirm that there are no CAN communication malfunctions before troubleshooting this symptom...
Other information:
Toyota Yaris XP210 (2020-2025) Reapir and Service Manual: Problem Symptoms Table
PROBLEM SYMPTOMS TABLE HINT: Inspect the fuses and relays related to this system before inspecting the suspected areas below. Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table...
Toyota Yaris XP210 (2020-2025) Reapir and Service Manual: Terminals Of Ecu
TERMINALS OF ECU CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND POWER DISTRIBUTION BOX ASSEMBLY *1 Power Distribution Box Assembly *2 Main Body ECU (Multiplex Network Body ECU) (a) Remove the main body ECU (multiplex network body ECU) from the power distribution box assembly...
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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.