Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSACURA2008RLREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTEXTERIOR LIGHTSADAPTIVE FRONT LIGHTING SYSTEM
2008 Acura RL
Adaptive Front Lighting System
2008 Acura RLSECTION Adaptive Front Lighting System
- Component Location Index
- System Description
- Circuit Diagram
- General Troubleshooting Information
- DTC Troubleshooting
- DTC B2105: Adaptive Front Lighting Control Unit Lost Communication with Gauge Control Module (STEERING Message)
- DTC B2106: Adaptive Front Lighting Control Unit Lost Communication with Gauge Control Module (A/T Message)
- DTC B2107: Adaptive Front Lighting Control Unit Lost Communication with MICU (MICU Message)
- DTC B2108: Adaptive Front Lighting Control Unit Lost Communication with Combination Switch Control Unit (HLSW Message)
- DTC B2125: Steering Angle Sensor Signal Error
- DTC B2126: Steering Angle Sensor Z Pulse Line or Supply Line Open
- DTC B2127: Steering Angle Sensor Malfunction
- DTC B2128: Steering Angle Sensor Signal Error
- DTC B2129: Steering Angle Sensor Circuit Malfunction
- DTC B2130: A Short in the Steering Angle Sensor Z Pulse Line
- DTC B2131: Steering Angle Sensor (MAX) Error
- DTC B2132: Steering Angle Sensor Learning Error
- DTC B2134: Wheel Speed (RLP, RRP line) Circuit Open
- DTC B2135: A/T Reverse Signal Error
- DTC B2136: Left Adaptive Front Lighting Gearbox Motor Signal Error
- DTC B2137: Right Adaptive Front Lighting Gearbox Motor Signal Error
- DTC B2139: Headlight Leveling Motor Power Supply Circuit Error
- DTC B2140: Headlight Leveling Motor Signal Circuit Error
- DTC B2141: Suspension Stroke Sensor Output Error
- DTC B2142: Adaptive Front Lighting Control Unit Sub CPU Communication Error; DTC B2143: Adaptive Front Lighting Control Unit Sub CPU Memory Error; DTC B2144: Adaptive Front Lighting Control Unit Sub CPU EEPROM Error
- DTC B2145: Left Adaptive Front Lighting Gearbox Motor Swing Error
- DTC B2146: Right Adaptive Front Lighting Gearbox Motor Swing Error
- Adaptive Front Lighting Control Unit Learning Procedure Index
- Adaptive Front Lighting Control Unit Learning Procedure
- When the adaptive front lighting control unit is replaced (a brand new adaptive front lighting control unit is installed).
- When the adaptive front lighting control unit is replaced (a known-good adaptive front lighting control unit is installed).
- When the suspension stroke sensor is removed or replaced, or the suspension stroke sensor link is disassembled.
- When the headlight is replaced, or when the adaptive front lighting gearbox is replaced.
- When the AFS OFF switch or combination light switch is replaced.
- When an HID unit or HID bulb is replaced.
- Control Unit Input Test
- Headlight Leveling Motor Test
- AFS OFF Switch Test/Replacement
- Adaptive Front Lighting Gearbox Test
- Suspension Stroke Sensor Test
- Suspension Stroke Sensor Replacement
- Adaptive Front Lighting Gearbox Replacement
- Headlight Leveling Motor Replacement
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.