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.
2023 Acura MDX BaseFACTORY OEM SERVICE PROCEDURE
Keyless Access Control Unit (Body Control Module)
| DTC | Description |
|---|---|
| DTC Troubleshooting: B1601 (Keyless Access Control Unit) | Keyless access control unit internal (CPU) error |
| DTC | Description |
|---|---|
| DTC Troubleshooting: B1602 (Keyless Access Control Unit) | BCM Internal Error (EEPROM Error) |
| DTC Troubleshooting: B1627 | RF1 UNIT DISCONNECTED |
| DTC Troubleshooting: B1640 | RF1 antenna not connected or malfunction |
| DTC Troubleshooting: B1645 | Driver's Door LF Antenna (Left-Front LF Antenna/Initiator) Circuit Short |
| DTC Troubleshooting: B1646 | Driver's Door LF Antenna (Left-Front LF Antenna/Initiator) Circuit Open |
| DTC Troubleshooting: B1647 | Passenger's Door LF Antenna (Right-Front LF Antenna/Initiator) Circuit Short |
| DTC Troubleshooting: B1648 | Passenger's Door LF Antenna (Right-Front LF Antenna/Initiator) Circuit Open |
| DTC Troubleshooting: B1649 | DRIVER SIDE REAR PASSENGER DOOR LF ANTENNA (LEFT-REAR LF ANTENNA/INITIATOR) CIRCUIT SHORT |
| DTC Troubleshooting: B1650 | DRIVER SIDE REAR PASSENGER DOOR LF ANTENNA (LEFT-REAR LF ANTENNA/INITIATOR) CIRCUIT OPEN |
| DTC Troubleshooting: B1651 | PASSENGER SIDE REAR PASSENGER DOOR LF ANTENNA (RIGHT-REAR LF ANTENNA/INITIATOR) CIRCUIT SHORT |
| DTC Troubleshooting: B1652 | PASSENGER SIDE REAR PASSENGER DOOR LF ANTENNA (RIGHT-REAR LF ANTENNA/INITIATOR) CIRCUIT OPEN |
| DTC Troubleshooting: B1657 | TRUNK/TAILGATE/REAR BUMPER ANTENNA (REAR BUMPER LF ANTENNA) CIRCUIT SHORTED |
| DTC Troubleshooting: B1658 | Trunk/Tailgate/Rear Bumper LF Antenna (Rear Bumper LF Antenna) Circuit Open |
| DTC Troubleshooting: B1659 | Front Interior LF Antenna Circuit Short |
| DTC Troubleshooting: B1660 | Front Interior LF Antenna Circuit Open |
| DTC Troubleshooting: B1661 | MIDDLE INTERIOR ANTENNA CIRCUIT OPENED |
| DTC Troubleshooting: B1662 | MIDDLE INTERIOR ANTENNA CIRCUIT SHORTED |
| DTC Troubleshooting: B1663 | Rear Interior LF Antenna Circuit Short |
| DTC Troubleshooting: B1664 | Rear Interior LF Antenna Circuit Open |
| DTC Troubleshooting: U1280 (Keyless Access Control Unit) | B-CAN communication bus line error (BUS-OFF) |
| DTC Troubleshooting: U1281 (Keyless Access Control Unit) | BCM lost communication with BCM/MICU |
| DTC Troubleshooting: U128D (Keyless Access Control Unit) | BCM lost communication with gauge control module |
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.
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