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.
2012 Acura RLFACTORY OEM SERVICE PROCEDURE
Keyless Access DTCS
KEYLESS ACCESS DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC | Description | ||
|---|---|---|---|
| B1600 | Keyless Access ECU Bus Line Error (BUS-OFF) See below | ||
| DTC B1050 | COMMUNICATION CIRCUIT ERROR (BUS-OFF) | ||
| DTC B1150 | COMMUNICATION CIRCUIT ERROR (BUS-OFF) | ||
| DTC B1200 | COMMUNICATION BUS LINE (BUS-OFF) | ||
| DTC B1250 | COMMUNICATION CIRCUIT ERROR (BUS-OFF) | ||
| DTC B1600 | KEYLESS ACCESS ECU BUS LINE ERROR (BUS-OFF) | ||
| DTC B1750 | COMMUNICATION CIRCUIT ERROR (BUS-OFF) | ||
| DTC B1800 | COMMUNICATION CIRCUIT ERROR (BUS-OFF) | ||
| DTC B2100 | COMMUNICATION CIRCUIT ERROR (BUS-OFF) | ||
| DTC B2150 | COMMUNICATION CIRCUIT ERROR (BUS-OFF) | ||
| DTC B2200 | COMMUNICATION CIRCUIT ERROR (BUS-OFF) | ||
| B1601 | Keyless Access ECU CPU Error | ||
| B1602 | Keyless Access ECU EEPROM Error | ||
| B1605 | Keyless Access-MICU Communication Error | ||
| B1610 | Keyless Access-Gauge Communication Error | ||
| B1613 | Malfunction of Communication With Driver's MPCS Unit | ||
| B1614 | Malfunction of Communication With Driver's MPCS Unit | ||
| B1615 | Malfunction of Communication With Driver's MPCS Unit | ||
| B1626 | Knob Ignition Disconnected | ||
| B1627 | RF1 Unit Disconnected | ||
| B1628 | RF2 Unit Disconnected | ||
| B1640 | RF1 Unit Transmitter/Receiver Circuit Malfunction | ||
| B1641 | RF2 Unit Transmitter/Receiver Circuit Malfunction | ||
| B1645 | Driver Door Antenna Circuit Short | ||
| B1646 | Driver Door Antenna Circuit Open | ||
| B1647 | Front Passenger Door Antenna Circuit Short | ||
| B1648 | Front Passenger Door Antenna Circuit Open | ||
| B1657 | Trunk/Tailgate/Rear Bumper Antenna Circuit Shorted | ||
| B1658 | Trunk/Tailgate/Rear Bumper Antenna Circuit Opened | ||
| B1659 | Front Interior Antenna Circuit Shorted | ||
| B1660 | Front Interior Antenna Circuit Opened | ||
| B1663 | Rear Interior Antenna Circuit Shorted | ||
| B1664 | Rear Interior Antenna Circuit Opened | ||
| B1667 | Trunk Room Antenna Circuit Shorted | ||
| B1668 | Trunk Room Antenna Circuit Opened | ||
| B1671 | Key Switch Circuit OFF Stuck (OFF Trouble) | ||
| B1672 | Knob Switch Circuit ON Stuck (ON Trouble) | ||
| B1673 | Knob Switch Circuit OFF Stuck (OFF Trouble) | ||
| B1674 | Knob Ignition Rotate Switch Circuit ON Stuck (ON Trouble) | ||
| B1675 | Knob Ignition Rotate Switch Circuit OFF Stuck (OFF Trouble) | ||
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Factory Service Tools
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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.
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