CUSTOMER PROBLEM ANALYSIS CHECK
DRIVER SIDE JUNCTION BLOCK CONTROL SYSTEM Check Sheet
Driver Side Junction Block Control System Customer Problem Analysis Check Sheet. Scheme 59
Scheme 60
- DTC CHECK (Using LEXUS hand-held tester) Prepare the LEXUS hand-held tester. Connect the LEXUS hand-held to DLC3. Turn the ignition switch ON and the LEXUS hand-held tester main switch ON. Use the LEXUS hand-held tester to check the DTCs, note them down. For opening instructions, see the LEXUS hand-held tester's instruction book. See «DIAGNOSTIC TROUBLE CODE CHART»(ref-198063-S12343307922005101400000), to confirm the details of the DLC3. (Scheme 60): Connecting LEXUS Hand-Held Tester To DLC3
- DTC CLEARANCE DTC will be cleared when the trouble output to DTC is recovered normally.
LIGHTING SYSTEM
| Symptom | Suspect Area |
|---|---|
| Headlight does not light up. (Low beam) | 1. Light control switch circuit 2. Headlight relay circuit 3. Combination switch 4. Driver side J/B ECU |
| Headlight system does not operate. (HI beam or Flash) | 1. Headlight (Hl-beam) circuit 2. Light control switch circuit 3. Combination switch 4. Front light ECU 5. Driver side J/B ECU |
| Automatic light control system does not operate. | 1. Automatic light control sensor circuit 2. Combination switch 3. Front light ECU 4.Driver side J/B ECU |
| Both left and right headlight does not light up. | 1. Headlight circuit 2. Light control switch circuit 3. Combination switch 4. Front light ECU 5. Driver side J/B ECU |
| Front fog light does not light up. | 1. Front fog light circuit 2. Light control switch circuit 3. Combination switch 4. Front light ECU 5. Driver side J/B ECU |
| Rear combination light does not light up. (All) | 1. Power source circuit 2. Combination switch 3. Driver side J/B ECU 4. Luggage room J/B ECU |
| Both left and right taillight does not light up. | 1. Taillight circuit 2. Light control switch circuit 3. Combination switch 4. Driver side J/B ECU 5. Luggage room J/B ECU |
| Both left and right stop light does not light up. | 1. Stop light circuit 2. Combination switch 3. Driver side J/B ECU 4. Luggage room J/B ECU |
| Hi-mounted stop light does not light up | 1. Hi-mounted stop light circuit 2. Combination switch 3. Driver side J/B ECU 4. Luggage room J/B ECU |
| Back-up light does not light up. | 1. Back-up light circuit 2. Combination switch 3. Driver side J/B ECU 4. Luggage room J/B ECU |
| License plate light does not light up. | 1. License plate light circuit 2. Combination switch 3. Driver side J/B ECU 4. Luggage room J/B ECU |
| Parking light does not light up. | 1. Parking light circuit 2. Light control switch circuit 3. Combination switch 4. Front light ECU 5. Driver side J/B ECU |
| Slide marker light does not light up. | 1. Side maker light circuit 2. Combination switch circuit 3. Front light ECU 4. Driver side J/B ECU |
| Light auto turn off system does not operate. (Headlight is normal) | 1. Headlight circuit 2. Light control switch circuit 3. Combination switch 4. Driver side J/B ECU |
| Taillight system does not light up. | 1. Taillight circuit 2. Light control switch circuit 3. Combination switch 4. Luggage room J/B ECU 5. Driver side J/B ECU |
LIGHTING SYSTEM - PROBLEM SYMPTOMS
TURN SIGNAL AND HAZARD WARNING SYSTEM
| Symptom | Suspect Area |
|---|---|
| Hazard warning light does not light up. | 1. Hazard switch circuit 2. Combination switch 3. Front light ECU 4 Driver side J/B ECU |
| Turn signal light does not light up. (All) | 1. Turn signal light circuit 2. Light control switch circuit 3. Combination switch 4. Front light ECU 5. Driver side J/B ECU |
TURN SIGNAL AND HAZARD WARNING SYSTEM - PROBLEM SYMPTOMS
ILLUMINATION LIGHT SYSTEM
| Symptom | Suspect Area |
|---|---|
| All switch illumination light does not light up. | 1. Power source circuit 2. Rheostat light control volume circuit 3. Driver side J/B ECU |
| Each switch illumination light does not light up. | 1. Illumination light circuit 2. Driver side J/B ECU |
| Brightness does not change even when rheostat turned. (All) | 1. Rheostat light control volume circuit 2. Driver side J/B ECU |
| Brightness does not change even when rheostat turned. (Meter illumination) | 1. Rheostat light control volume circuit 2. Combination meter circuit 3. Driver side J/B ECU |
| Driver seat belt buckle illumination circuit. | 1. Driver buckle illumination circuit 2. Driver side J/B ECU |
| Glove compartment door light does not light up. | 1. Illumination light circuit 2. Driver side J/B ECU |
ILLUMINATION LIGHT SYSTEM - PROBLEM SYMPTOMS
STOP LIGHT SYSTEM
| Symptom | Suspect Area |
|---|---|
| Stop light system does not light up. | 1. Stop light switch circuit 2. Stop light circuit 3. Driver side J/B ECU |
STOP LIGHT SYSTEM - PROBLEM SYMPTOMS
HEADLIGHT CLEANER SYSTEM
| Symptom | Suspect Area |
|---|---|
| Headlight cleaner system does not operate. | 1. Headlight cleaner nozzle and hose 2. Headlight cleaner switch circuit 3. Headlight cleaner motor circuit 4. Headlight cleaner relay circuit 5. Driver side J/B ECU |
HEADLIGHT CLEANER SYSTEM - PROBLEM SYMPTOMS
DRIVER SEAT BELT SYSTEM
| Symptom | Suspect Area | See Test |
|---|---|---|
| Driver seat belt warning does not light up. | 1. Driver buckle switch circuit 2. Driver side J/B ECU | DRIVER BUCKLE SWITCH CIRCUIT |
| Driver seat belt electric tension reducer system does not operate. | 1. Driver buckle switch circuit 2. Driver tension reducer circuit 3. Driver side J/B ECU | DRIVER BUCKLE SWITCH CIRCUIT DRIVER SEAT BELT TENSION REDUCER CIRCUIT |
DRIVER SEAT BELT SYSTEM - PROBLEM SYMPTOMS
POWER SHOULDER BELT ANCHORAGE SYSTEM
| Symptom | Suspect Area |
|---|---|
| Driver belt anchor can not be operated manually. | 1. Power source circuit 2. Shoulder belt anchor motor circuit 3. Shoulder belt anchor sensor circuit 4. Driver door ECU 5. Driver side J/B ECU |
POWER SHOULDER BELT ANCHORAGE SYSTEM - PROBLEM SYMPTOMS
OTHERS
| Symptom | Suspect Area |
|---|---|
| Stop light switch signal is sent to Shift lock, VSC and Engine control system. | 1. Stop light switch circuit 2. Driver side J/B ECU |
OTHERS - PROBLEM SYMPTOMS
HINT
When diagnosis this ECU, select the "BODY NO. 2" from the MENU of the LEXUS hand-held tester.