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HOMESERVICE MANUALSACURA2015RDX AWDREPAIR AND DIAGNOSIS (SINGLE PAGE)BODY & FRAMEDOOR LOCKSKEYLESS ACCESS CONTROL UNIT - DIAGNOSTICSDTC TROUBLESHOOTINGDTC B1645: DRIVER'S DOOR LF ANTENNA CIRCUIT SHORT (2016-18)

2015 Acura RDX AWD

DTC B1645: Driver's Door LF Antenna Circuit Short (2016-18)

2015 Acura RDX AWDSECTION DTC B1645: Driver's Door LF Antenna Circuit Short (2016-18)

DTC Description	DTC
B1645 Driver's Door LF Antenna Circuit Short

DTC (Keyless Access Control Unit)

Problem verification:

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.

- 3. One-Push - KEYLESS ACCESS CONTROL UNIT - SELF CHECK

Do the SELF CHECK.

- 4. Check for DTCs with the HDS.

DTC Description	DTC
B1645 Driver's Door LF Antenna Circuit Short

Is DTC B1645 indicated?

YES

Go to step 2.

Intermittent failure, the system is OK at this time. Check for loose or poor connections.

Shorted wire check (EXT FR DR+, EXT FR DR- lines):

Press the engine start/stop button to select the OFF mode.

- 2. Disconnect the following connectors.

Keyless access/TPMS control unit connector A (32P)

Left-front LF antenna/initiator 2P connector - Refer to: Keyless Access LF Antenna/Initiator (Left-Rear) Removal and Installation (2016-18), or Keyless Access LF Antenna/Initiator (Right-Front) Removal and Installation (2016-18), or Keyless Access LF Antenna/Initiator (Left-Front) Removal and Installation (2016-18), or Keyless Access LF Antenna/Initiator (Right-Rear) Removal and Installation (2016-18)

- 3. Check for continuity between test points 1 and 2 individually.

Test condition	OFF modeKeyless access/TPMS control unit connector A (32P): disconnectedLeft-front LF antenna/initiator 2P connector: disconnected
Test circuit	EXT FR DR+
Test point 1	Keyless access/TPMS control unit connector A (32P) No. 13 (YEL)
Test point 2	Body ground

Test circuit	EXT FR DR-
Test point 1	Keyless access/TPMS control unit connector A (32P) No. 29 (LT BLU)
Test point 2	Body ground

Courtesy of HONDA, U.S.A., INC.

Is there continuity?

YES

Repair a short to ground in the wire.

The EXT FR DR+ and EXT FR DR- wires are not shorted. Go to step 3.

Shorted wire check (EXT FR DR+ line to EXT FR DR- line):

Check for continuity between test points 1 and 2.

Test condition	OFF modeKeyless access/TPMS control unit connector A (32P): disconnectedLeft-front LF antenna/initiator 2P connector: disconnected
Test circuit	EXT FR DR+, EXT FR DR-
Test point 1	Keyless access/TPMS control unit connector A (32P) No. 13 (YEL)
Test point 2	Keyless access/TPMS control unit connector A (32P) No. 29 (LT BLU)

Courtesy of HONDA, U.S.A., INC.

Is there continuity?

YES

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

The EXT FR DR+ and EXT FR DR- wires are OK. Go to step 4.

Keyless access/TPMS control unit EXT FR DR+, EXT FR DR- line output check:

Reconnect the following connector.

Keyless access/TPMS control unit connector A (32P)

- 2. Press the engine start/stop button to select the ON mode.

- 3. Select KEYLESS ACCESS CONTROL from the ONE-PUSH START system select menu with the HDS, and enter FUNCTIONAL TESTS.

- 4. One-Push - KEYLESS ACCESS CONTROL UNIT - FUNCTIONAL TESTS

Connect the voltmeter to test points 1 and 2.

Test condition	ON modeLeft-front LF antenna/initiator 2P connector: disconnected
Test circuit	EXT FR DR+, EXT FR DR-
Test point 1	Left-front LF antenna/initiator 2P connector No. 2 (YEL)
Test point 2	Left-front LF antenna/initiator 2P connector No. 1 (LT BLU)