Honda HR-V: DTC B1646, B1648, B1660, B1664 Antenna Circuit Open
NOTE: Refer to the DTC code shown on the display, and then inspect the connectors and terminals based on the instructions in the table below.
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DTC (Keyless Access Control Unit)
NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A - Refer to: Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode A - Initial Communication and DTC Checks.
1. Problem verification:
- Clear the DTCs with the HDS.
Clear DTCs
- Select the KEYLESS ACCESS CONTROL UNIT from the ONE-PUSH START system select menu with the HDS, and enter the SELF CHECK.
One-Push - KEYLESS ACCESS CONTROL UNIT - SELF CHECK
- Do the SELF CHECK.
- Check for DTCs with the HDS.
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Are any DTCs indicated?
YES
Go to step 2.
NO
Intermittent failure, the system is OK at this time. Check for loose or poor connections.
2. Keyless access control unit EXT lines output check:
- Turn the vehicle to the OFF (LOCK) mode.
- Disconnect the following connector.
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- Turn the vehicle to the ON mode.
- Connect the voltmeter to terminals as specified in the table.
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- Select KEYLESS ACCESS CONTROL from the ONE-PUSH START system select menu with the HDS, and enter FUNCTIONAL TESTS.
One-Push - KEYLESS ACCESS CONTROL UNIT - FUNCTIONAL TESTS
- Select each ANTENNA L DC OUTPUT with the HDS.
Is there voltage?
YES
Replace the faulty LF antenna.
NO
Go to step 3.
3. Open wire check (EXT+ lines):
- Turn the vehicle to the OFF (LOCK) mode.
- Disconnect the following connector.
Keyless access control unit connector A (32P)
- Check for continuity between terminals as specified in the table while in the vehicle OFF mode.
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Is there continuity?
YES
The EXT+ wires are OK. Go to step 4.
NO
Repair an open or high resistance in the wire between the keyless access control unit and the LF antenna.
4. Open wire check (EXT- lines):
Check for continuity between terminals as specified in the table while in the vehicle OFF mode.
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Is there continuity?
YES
Replace the keyless access control unit.
NO
Repair an open or high resistance in the wire between the keyless access control unit and the LF antenna.
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DTC U1280 (Keyless Access Control Unit) Keyless Access Control Unit
Communication Bus Line Error (BUS-OFF)
DTC (Keyless Access Control Unit)
NOTE: If you are troubleshooting multiple DTCs, be sure to follow the
instructions in B-CAN System
Diagnosis Test Mode A - Refer to: Body Electrical Troubleshooting
DTC U1281, U128D (Keyless Access Control Unit)
NOTE:
Refer to the DTC code shown on the display, and then inspect the
connectors and terminals based on the
instructions in the table below.
The DTC may be stored due to the grounding failure o
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