B1802 on Toyota
Lamp Turn Signal Rear Output Circuit (manufacturer-specific)
B1802 on Toyota vehicles indicates lamp turn signal rear output circuit (manufacturer-specific). Au7o has documented this code across 2 Toyota models — most commonly on Corolla, RAV4. B1802 is a manufacturer-specific body code, associated mainly with Ford-family lighting systems, that generally indicates a fault in the rear turn-signal lamp output circuit detected by the lighting/body control module. Because it is manufacturer-specific, the precise wording and fault type (open, short, or failure) can vary by make and model and should be confirmed against the vehicle's service information. The practical effect is typically an inoperative or improperly functioning rear turn signal. Typical repair costs on Toyota range from $300 to $900, depending on the specific model and root cause.
Common Causes of B1802
- •Fault (short or open) in the rear turn-signal wiring
- •Faulty rear turn-signal bulb
- •Corroded or damaged bulb socket/connector
- •Chafed or pinched rear harness
- •Water intrusion in the rear lamp assembly
- •Internal fault in the lighting/body control module
B1802 on Toyota by Model
Toyota Corolla(1 issue)
- Airbag Warning Light from Spiral Cable (Clock Spring) Failure2009-2013
A common problem on 10th-generation Corolla models is failure of the steering wheel spiral cable, also called the clock spring. When the ribbon circuit inside the cable breaks, the SRS warning light illuminates and steering-wheel-mounted functions such as the horn or audio switches may stop working. Toyota issued a warranty enhancement and many owners also documented the issue through NHTSA complaints and forum reports.
Toyota RAV4(1 issue)
- Steering Column Spiral Cable Failure Causing Airbag/SRS Light and Loss of Horn or Wheel Controls2006-2012
Multiple 2006-2012 RAV4 owners report failure of the steering wheel spiral cable (clock spring), which can trigger the SRS warning light and disable the horn, cruise control, or steering-wheel audio switches. Toyota issued a warranty enhancement/customer support program on certain vehicles for spiral cable failure after widespread complaints. The failure is usually caused by internal ribbon-cable fatigue from repeated steering-wheel rotation.
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View B1802 across all makes →Frequently Asked Questions
What does B1802 mean on Toyota?▼
B1802 stands for "Lamp Turn Signal Rear Output Circuit (manufacturer-specific)." B1802 is a manufacturer-specific body code, associated mainly with Ford-family lighting systems, that generally indicates a fault in the rear turn-signal lamp output circuit detected by the lighting/body control module. Because it is manufacturer-specific, the precise wording and fault type (open, short, or failure) can vary by make and model and should be confirmed against the vehicle's service information. The practical effect is typically an inoperative or improperly functioning rear turn signal. On Toyota specifically, this code is documented across 2 models.
What causes B1802 on Toyota vehicles?▼
Common causes on Toyota: Fault (short or open) in the rear turn-signal wiring, Faulty rear turn-signal bulb, Corroded or damaged bulb socket/connector, Chafed or pinched rear harness, Water intrusion in the rear lamp assembly. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix B1802 on a Toyota?▼
Repair costs on Toyota range from $300 to $900, depending on the specific model and root cause.
Which Toyota models have B1802 documented?▼
Au7o has documented B1802 on 2 Toyota models: Corolla, RAV4.