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.
Keyless Access Control Unit (Body Control Module)
2023 Acura MDX BaseSECTION 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 |
RENDER: 1.0x
NO RELATED
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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.