Note
As the door control battery is installed between the vehicle battery and body ECU, first perform the inspections to confirm that there are no malfunctions in the power source circuit for the body ECU before performing this troubleshooting procedure.*1
If the body ECU has been replaced, it is necessary to initialize the body ECU.*2
When replacing the certification ECU (smart key ECU assembly), refer to the Service Bulletin.
*1: w/ Door Control Battery
*2: w/ Automatic Light Control System
Tech Tips
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, relays and bulbs related to this system before inspecting the suspected areas below.
| Symptom | Suspected Area | Link |
|---|---|---|
| Illuminated entry system does not operate normally | Entry and start system (for Entry Function)*1 | |
| Light cut relay (DOME CUT) | ||
| Front door courtesy light switch assembly*2 | ||
| Front door courtesy light switch assembly*3 | ||
| Front door courtesy light switch assembly*4 | ||
| Rear door courtesy light switch assembly*3 | ||
| Front door lock assembly*5 | ||
| Rear door lock assembly*3,*5 | ||
| Upper access panel lock assembly*4 | ||
| Lower access panel lock assembly*4 | ||
| Harness or connector | - | |
| Combination meter assembly | ||
| Instrument panel junction block assembly (for LHD) | ||
| Instrument panel junction block assembly (for RHD) | ||
| Body ECU (for LHD) | ||
| Body ECU (for RHD) | ||
| Only engine switch illumination does not illuminate*1 | Engine switch illumination circuit | |
| Certification ECU (smart key ECU assembly) | - | |
| Body ECU (for LHD) | ||
| Body ECU (for RHD) | ||
| Only ignition key cylinder light does not illuminate*6 | Transponder key coil | |
| Harness or connector | - | |
| Interior light does not illuminate (w/ Immobiliser System) | Light cut relay (DOME CUT) | |
| Body ECU (for LHD) | ||
| Body ECU (for RHD) | ||
| Instrument panel junction block assembly (for LHD) | ||
| Instrument panel junction block assembly (for RHD) | ||
| Harness or connector | - | |
| Interior light does not illuminate (w/o Immobiliser System) | Light cut relay (DOME CUT) | |
| Combination meter assembly | ||
| Harness or connector | - |
*1: w/ Entry and Start System
*2: for Single Cab
*3: for Double Cab
*4: for Smart Cab
*5: w/ Immobiliser System
*6: w/ Immobiliser System (w/o Entry and Start System)
| Symptom | Suspected Area | Link |
|---|---|---|
| Battery saving function does not operate | Light cut relay (DOME CUT) | |
| Body ECU (for LHD)*1 | ||
| Body ECU (for RHD)*1 | ||
| Instrument panel junction block assembly (for LHD)*1 | ||
| Instrument panel junction block assembly (for RHD)*1 | ||
| Combination meter assembly*2 | ||
| Harness or connector | - |
*1: w/ Immobiliser System
*2: w/o Immobiliser System
| Symptom | Suspected Area | Link |
|---|---|---|
| Map light does not illuminate | Map light assembly | |
| Harness or connector | - |
| Symptom | Suspected Area | Link |
|---|---|---|
| No. 1 room light does not illuminate | No. 1 room light assembly | |
| Harness or connector | - |
| Symptom | Suspected Area | Link |
|---|---|---|
| No instrument panel illumination comes on | Lighting System (EXT) | |
| Harness or connector | - |