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.
2009 Acura RLFACTORY OEM SERVICE PROCEDURE
Keyless Access DTCS
KEYLESS ACCESS DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC | Description |
|---|---|
| B1600 | Keyless Access Control Unit Bus Line Error (BUS OFF) |
| B1601 | Keyless Access Control Unit Internal (CPU) Error |
| B1602 | Keyless Access Control Unit Internal (EEPROM) Error |
| B1605 | Keyless Access Control Unit Lost Communication with MICU (MICU Message) |
| B1610 | Keyless Access Control Unit Lost Communication with Gauge Control Module (VSP/NE Message) |
| B1613 | Keyless Access Control Unit Lost Communication with Driver's MPCS Unit (DOORSW Message) |
| B1614 | Keyless Access Control Unit Lost Communication with Driver's MPCS Unit (DRLOCKSW Message) |
| B1615 | Keyless Access Control Unit Lost Communication with Driver's MPCS Unit (ASLOCKSW Message) |
| B1626 | Ignition Switch Control Unit No Response |
| B1627 | RF Unit 1 Not Connected |
| B1628 | RF Unit 2 Not Connected |
| B1640 | RF Unit 1 Circuit Malfunction |
| B1641 | RF Unit 2 Circuit Malfunction |
| B1645 | Driver's Door LF Antenna Circuit Short |
| B1646 | Driver's Door LF Antenna Circuit Open |
| B1647 | Passenger's Door LF Antenna Circuit Short |
| B1648 | Passenger's Door LF Antenna Circuit Open |
| B1657 | Rear Bumper LF Antenna Circuit Short |
| B1658 | Rear Bumper LF Antenna Circuit Open |
| B1659 | Front Interior LF Antenna Circuit Short |
| B1660 | Front Interior LF Antenna Circuit Open |
| B1663 | Rear Interior LF Antenna Circuit Short |
| B1664 | Rear Interior LF Antenna Circuit Open |
| B1667 | Rear Shelf LF Antenna Circuit Short |
| B1668 | Rear Shelf LF Antenna Circuit Open |
| B1671 | Ignition Switch Control Unit (KEY SW Line) Circuit Open |
| B1672 | Ignition Switch Control Unit (KNOB SW) Circuit Short |
| B1673 | Ignition Switch Control Unit (KNOB SW) Circuit Open |
| B1674 | Ignition Switch Control Unit (ROTATE SW) Circuit Short |
| B1675 | Ignition Switch Control Unit (ROTATE SW) Circuit Open |
Factory Service Tools
Use the Manual With the Right Hardware
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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.