Honda HR-V: DTC B1645, B1647, B1659, B1663 Antenna Circuit Short

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.

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:

1. Clear the DTCs with the HDS.

Clear DTCs

2. 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

3. Do the SELF CHECK.
4. ^{Check for DTCs with the HDS.}

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. Shorted wire check (EXT+ lines):

1. Turn the vehicle to the OFF (LOCK) mode.
2. Disconnect the following connectors.

3. Check for continuity between terminals as specified in the table while in the vehicle OFF mode.

Is there continuity?

YES

Repair a short in the wire between the keyless access control unit and the LF antenna.

NO

The EXT+ wires are not shorted. Go to step 3.

3. Shorted wire check (EXT- lines):

Check for continuity between terminals as specified in the table while in the vehicle OFF mode.

Is there continuity?

YES

Repair a short in the wire between the keyless access control unit and the LF antenna.

NO

The EXT- wires are not shorted. Go to step 4.

4. Shorted wire check (EXT+ line to EXT- line):

1. Check for continuity between terminals as specified in the table while in the vehicle OFF mode.

Is there continuity?

YES

Repair a short in EXT+ wire to EXT- wire.

NO

The EXT wires are OK. Go to step 5.

5. Keyless access control unit EXT lines output check:

1. Reconnect the following connector.

Keyless access control unit connector A (32P)

2. Turn the vehicle to the ON mode.
3. Connect the voltmeter to terminals as specified in the table.

4. 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

5. Select each ANTENNA L DC OUTPUT with the HDS.

Is there voltage?

YES

Replace the faulty LF antenna.

NO

Replace the keyless access control unit.

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