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Problem Symptoms Table

WARNING: This page is about a different car, the 2011 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.

If a normal system code is displayed during the DTC check but the problem still occurs, check the circuits for each problem symptom in the order given in the table below and proceed to the relevant troubleshooting "See" below.

HINT: 

Inspect the fuse and relay before confirming the suspected area in the table below.

Inspect each malfunction circuit in numerical order for the corresponding symptom.

If the malfunction still exists even after checking and confirming that all the circuits are normal, replace the ECU.

1. HEADLIGHT AND TAIL LIGHT SYSTEM

Symptom Suspected Area See
"Low beam" does not come on (One side). 1. Bulb -
2. Headlight relay circuit Refer to Headlight Relay Circuit
"Low beam" does not come on (Both sides). 1. Bulb -
2. Combination switch ECU power source circuit Refer to Combination Switch ECU Power Source Circuit
3. Light control switch circuit Refer to Light Control Switch Circuit
4. Headlight relay circuit Refer to Headlight Relay Circuit
5. Front controller -
6. Body ECU -
"High beam" does not come on (One side). 1. Bulb -
2. Headlight (HI-BEAM) circuit Refer to Headlight (HI-BEAM) Circuit
3. Front controller -
"High beam" does not come on (Both sides). 1. Bulb -
2. Combination switch ECU power source circuit Refer to Combination Switch ECU Power Source Circuit
3. Light control switch circuit Refer to Light Control Switch Circuit
4. Headlight (HI-BEAM) circuit Refer to Headlight (HI-BEAM) Circuit
5. Front controller -
6. Body ECU -
"High beam" does not go off 1. Light control switch circuit Refer to Light Control Switch Circuit
2. Headlight (HI-BEAM) circuit Refer to Headlight (HI-BEAM) Circuit
3. Front controller -
"Flash" does not come on. (Low beam and Hi-Beam are normal) 1. Combination switch ECU power source circuit Refer to Combination Switch ECU Power Source Circuit
2. Light control switch circuit Refer to Light Control Switch Circuit
3. Body ECU -
Tail light does not come on (All). 1. Combination switch ECU power source circuit Refer to Combination Switch ECU Power Source Circuit
2. Light control switch circuit Refer to Light Control Switch Circuit
3. TAIL relay circuit Refer to Taillight Relay Circuit
4. Body ECU -
Only one tail light comes on. 1. Bulb -
2. Wire harness or connector -
Daytime running light system does not operate. 1. Combination switch ECU power source circuit Refer to Combination Switch ECU Power Source Circuit
2. Light control switch circuit Refer to Light Control Switch Circuit
3. Generator signal circuit Refer to Generator Signal Circuit
4. Parking brake switch circuit Refer to Parking Brake Switch Circuit
5. Ignition switch circuit Refer to Ignition Switch Circuit
6. Headlight (HI-BEAM) circuit Refer to Headlight (HI-BEAM) Circuit
7. Front controller -
8. Body ECU -
2. HEADLIGHT BEAM LEVEL CONTROL SYSTEM

Symptom Suspected Area Refer to
Headlight beam level control system does not operate. 1. Headlight beam level control actuator circuit Refer to Headlight Beam Level Control Actuator Circuit
2. Height control sensor circuit Refer to Height Control Sensor Circuit
3. Headlight beam level control ECU communication circuit Refer to Headlight Beam Level Control ECU Communication Circuit
4. Headlight beam level control ECU power source circuit Refer to Headlight Leveling ECU Power Source Circuit
5. Headlight beam level control ECU Refer to REMOVAL
Headlight beam warning light comes on. (Headlight beam level control system is normal) 1. Headlight beam level warning circuit Refer to Headlight Beam Level Warning Circuit
2. Combination meter assembly -
3. Headlight beam level control ECU Refer to REMOVAL
Headlight beam warning light does not come on. (Headlight beam level control system is normal) 1. Headlight beam level warning circuit Refer to Headlight Beam Level Warning Circuit
2. Combination meter assembly -
3. Headlight beam level control ECU Refer to REMOVAL
3. AUTOMATIC LIGHT CONTROL SYSTEM

Symptom Suspected Area Refer to
Automatic light control system does not operate. 1. Combination switch ECU power source circuit Refer to Combination Switch ECU Power Source Circuit
2. Light control switch circuit Refer to Light Control Switch Circuit
3. Ignition switch circuit Refer to Ignition Switch Circuit
4. Automatic light control sensor circuit Refer to DTC B1244: Light Sensor Circuit Malfunction
5. Body ECU -
4. LIGHT AUTO TURN OFF SYSTEM

Symptom Suspected Area Refer to
Light auto turn off system does not operate. 1. Combination switch ECU power source circuit Refer to Combination Switch ECU Power Source Circuit
2. Light control switch circuit Refer to Light Control Switch Circuit
3. Ignition switch circuit Refer to Ignition Switch Circuit
4. Door courtesy switch circuit Refer to Door Courtesy Switch Circuit
5. Front controller -
6. Body ECU -
5. FOG LIGHT SYSTEM

Symptom Suspected Area Refer to
Front fog light does not come on with the light control switch in TAIL or HEAD position (TAIL and HEAD are normal). 1. Combination switch ECU power source circuit Refer to Combination Switch ECU Power Source Circuit
2. Light control switch circuit Refer to Light Control Switch Circuit
3. Front fog light circuit Refer to Front Fog Light Circuit
4. Body ECU -
Only one front fog light does not come on. 1. Bulb -
2. Wire harness or connector -
6. TURN SIGNAL AND HAZARD WARNING SYSTEM

Symptom Suspected Area Refer to
Hazard warning light does not come on (Turn is normal). 1. Hazard warning switch circuit Refer to Hazard Warning Switch Circuit
2. Turn signal flasher assembly Refer to ON-VEHICLE INSPECTION
Turn signal light does not come on. 1. Light control switch circuit Refer to Light Control Switch Circuit
2. Turn signal light circuit Refer to Turn Signal Light Circuit
3. Body ECU -
Only one bulb does not come on. 1. Bulb -
2. Turn signal light circuit Refer to Turn Signal Light Circuit
7. STOP LIGHT SYSTEM

Symptom Suspected Area Refer to
Stop light does not operate (All). 1. Bulb -
2. Stop light switch Refer to INSPECTION
3. Wire harness or connector -
Only one stop light does not come on. 1. Bulb -
2. Wire harness or connector -
8. ILLUMINATED ENTRY SYSTEM

Symptom Suspected Area Refer to
Illuminated entry of Multiplex network body ECU control does not operate (All). 1. Ignition switch circuit Refer to Ignition Switch Circuit
2. Door lock position circuit Refer to Door LOCK Position Circuit
3. Door courtesy switch circuit Refer to Door Courtesy Switch Circuit
4. Illumination circuit Refer to Illumination Circuit
5. Body ECU -
9. OTHERS

Symptom Suspected Area Refer to
Vanity light does not come on. 1. Bulb -
2. Wire harness or connector -
Back up light does not come on. 1. Bulb -
2. Park / neutral position switch Refer to INSPECTION
3. Wire harness or connector -
Luggage compartment light does not come on. 1. Bulb -
2. Luggage room light circuit Refer to Luggage Room Light Circuit
3. Body ECU -
Courtesy light does not come on. 1. Bulb -
2. Door courtesy switch circuit Refer to Door Courtesy Switch Circuit
3. Body ECU -
Rear interior light does not come on. 1. Bulb -
2. Rear room light assembly Refer to INSPECTION
3. Door courtesy switch circuit Refer to Door Courtesy Switch Circuit
4. Wire harness or connector -
5. Body ECU -
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