Toyota Yaris: Lighting System / Problem Symptoms Table
PROBLEM SYMPTOMS TABLE
NOTICE:
Before replacing the main body ECU (multiplex network body ECU) or certification ECU (smart key ECU assembly), refer to Registration.
Click here
HINT:
- 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. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
- Inspect the fuses and relays related to this system before inspecting the suspected areas below.
| Symptom | Suspected Area | Link |
|---|---|---|
| Map light LH or map light RH does not illuminate (Other interior lights are normal) | Map light assembly |
|
| Map light LH and map light RH do not illuminate (Other interior lights are normal) | Map light assembly |
|
| Harness or connector | - |
| Symptom | Suspected Area | Link |
|---|---|---|
| Room light does not illuminate (Other interior lights are normal) | Bulb |
|
| Room light assembly |
| |
| Harness or connector | - |
| Symptom | Suspected Area | Link |
|---|---|---|
| Front Door Trim Illumination does not illuminate | Ambient illumination light circuit |
|
| Symptom | Suspected Area | Link |
|---|---|---|
| All illuminated entry system control functions do not operate under any condition | Interior light auto cut circuit |
|
| Interior Light Circuit |
| |
| Main body ECU (Multiplex network body ECU) |
| |
| Actuation area-linked control function does not operate when registered key is brought into any exterior detection area*1 | CAN communication system |
|
| Entry and start system (for Entry Function) |
| |
| Main body ECU (Multiplex network body ECU) |
| |
| Door lock/unlock-linked control function does not operate when doors are locked/unlocked | Check customize settings (Interior Lights ON when Door Unlocked Function) |
|
| Door Unlock Detection Switch Circuit |
| |
| Main body ECU (Multiplex network body ECU) |
| |
| Door open/close-linked control function does not operate when doors are opened/closed | Front door courtesy switch circuit |
|
| Back door courtesy switch circuit |
| |
| Main body ECU (Multiplex network body ECU) |
| |
| Push start switch-linked control function does not operate when push start switch is operated*1 | Check customize settings (Interior Lights ON when IG OFF Function) |
|
| IG signal circuit |
| |
| Main body ECU (Multiplex network body ECU) |
| |
| Push start switch illumination does not illuminate*1 | CAN communication system |
|
| Push Start Switch Illumination Circuit |
| |
| Shift position-linked control does not operate when shift lever is operated*4 | Check customize settings (Light Control Function) |
|
| CAN communication system |
| |
| Main body ECU (Multiplex network body ECU) |
|
| Symptom | Suspected Area | Link |
|---|---|---|
| Auxiliary battery saving function does not operate | Check illuminated entry system |
|
| Main body ECU (Multiplex network body ECU) |
|
| Symptom | Suspected Area | Link |
|---|---|---|
| No instrument panel illumination lights come on (taillights operate normally). | Instrument Panel Illumination does not Turn On |
|
| Harness or connector | - |
Customize Parameters
CUSTOMIZE PARAMETERS CUSTOMIZE LIGHTING SYSTEM (INT) NOTICE:
When the customer requests a change in a function, first make sure that the function can be customized...
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...
Other information:
Toyota Yaris XP210 (2020-2026) Reapir and Service Manual: Lost Communication with ECM/PCM "A" Missing Message (U010087,U012687,U012987)
DESCRIPTION The AWD ECU assembly receives signals from the ECM, steering sensor and skid control ECU (brake actuator assembly) via CAN communication. DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Memory U010087 Lost Communication with ECM/PCM "A" Missing Message When the ignition switch is ON, the IG1 terminal voltage is 10 V or more and the vehicle speed is 60 km/h (37 mph) or more, signals cannot be received from the ECM for 1 second or more CAN communication system AWD ECU assembly ECM Displayed Yes U012687 Lost Communication with Steering Angle Sensor Module Missing Message When the following continues: When the IG1 terminal voltage is 10 V or more, communication with the steering sensor is impossible for 1 second or more When the IG1 terminal voltage is 10 V or more, a condition in which communication with the steering sensor is impossible occurs 1 time or more within a 5-second period, and this occurs 10 times within 60 seconds CAN communication system AWD ECU assembly Steering sensor Displayed Yes U012987 Lost Communication with Brake System Control Module Missing Message When the IG1 terminal voltage is 10 V or more, communication with the skid control ECU (brake actuator assembly) is impossible for 3 seconds or more CAN communication system AWD ECU assembly Skid control ECU (Brake actuator assembly) Displayed Yes PROCEDURE 1...
Toyota Yaris XP210 (2020-2026) Reapir and Service Manual: Reassembly
REASSEMBLY PROCEDURE 1. INSTALL AIR DUCT ASSEMBLY (a) Install the air duct assembly with the 2 nuts. (b) Install the front panel silencer as shown in the illustration. (c) Install the 3 retainers. 2. INSTALL NO. 1 COOLER THERMISTOR Click here 3...
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Refueling
Before refueling, close all the doors, windows, and the liftgate/trunk lid, and switch the ignition OFF.
To open the fuel-filler lid, pull the remote fuel-filler lid release.
