B1802: Lamp Turn Signal Rear Output Circuit (manufacturer-specific)
2 vehicles · 1 makes · $300-$900 repair
Most Reported On
B1802 is an OBD-II diagnostic trouble code meaning “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. This code is most commonly reported on 2009-2013 Toyota Corolla, and 2006-2012 Toyota RAV4, with repair costs ranging from $300 to $900.
Common Causes
Typical Repair Cost
Based on 2 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose B1802, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
- Read & clear engine codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
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FAQ
What does B1802 mean?
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.
What are the most common causes of B1802?
The most common causes of B1802 are: 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. The specific cause varies by vehicle.
How much does it cost to fix B1802?
Repair costs for B1802 range from $300 to $900, depending on the vehicle and root cause.
Which vehicles are affected by B1802?
Au7o has documented B1802 across 2 vehicle models from 1 manufacturers: Toyota.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.