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Keyless Access System Acura RL II

Door Locks & Anti-Theft Systems 89 illustrations ~9809 words

Scheme 1

Scheme 1: Component Location Index
Scheme 1: Component Location Index

System Description

The keyless access system consists of the keyless access control unit, the ignition switch control unit, the door outer handle touch sensors, the LF (low frequency) antennas, the RF (radio frequency) units, the keyless access indicator, the keyless buzzer, and the remote. The function of the system is to allow the driver keyless entry into the vehicle along with starting the engine without an ignition key.

RF (Radio Frequency) Units

RF unit 1 is located behind the display control module and RF unit 2 is located on the rear shelf. The RF units combine the RF signal sensing and RF signal receiving to identify the remote's code.

LF (Low Frequency) Antennas

The front interior, rear interior and rear shelf LF antennas send the signals to the remote placed in the interior. The driver's door, front passenger's door, and rear bumper antennas send the signals to the keyless remote outside of the vehicle.

Ignition switch control unit

The ignition switch control unit is built in the ignition switch, and it controls the steering lock solenoid. When the built-in key is inserted in the ignition switch or the remote code is identified, the ignition switch control unit makes the steering lock solenoid release.

Touch Sensor and lock buttons

The touch sensors and lock buttons are built in the driver's and front passenger's door outer handles. To operate the door locks without the built-in key while carrying the remote, grip the door outer handle to unlock the doors and press the lock button on the door outer handle to lock the doors.

Fail-safe Function

The system has a fail-safe function. If any malfunction occurs, the keyless access indicator in the gauge comes on.

Self-diagnostic Function

The system also has a self-diagnostic function.

Scheme 2

Scheme 2: Circuit Diagram
Scheme 2: Circuit Diagram

Scheme 3

Scheme 3
Scheme 3

Scheme 4

Scheme 4
Scheme 4

Self-diagnosis Function

The keyless access system has a self-diagnosis function. If any malfunction is stored in the keyless access control unit, the DTC codes can be determined by the keyless access indicator blinking pattern.

Short the SCS line with the HDS, then turn the ignition switch ON (II). The keyless access indicator starts to show the DTCs if any DTCs are stored.

The DTC is cleared when the battery terminal is disconnected, or by removing the No. 15 (40A) fuse from the under-hood fuse/relay box.

DTCKeyless access indicator DTCDescription
B1600 (1)100Keyless Access Control Unit Bus Line Error (BUS OFF)
B16011O (2)Keyless Access Control Unit Internal (CPU) Error
B16022O (2)Keyless Access Control Unit Internal (EEPROM) Error
B16055Keyless Access Control Unit Lost Communication with MICU (MICU Message)
B161010Keyless Access Control Unit Lost Communication with Gauge Control Module (VSP/NE Message)
B161313Keyless Access Control Unit Lost Communication with Driver's MPCS Unit (DOOR SW Message)
B161414Keyless Access Control Unit Lost Communication with Driver's MPCS Unit (DRLOCKSW Message)
B161515Keyless Access Control Unit Lost Communication with Driver's MPCS Unit (ASLOCKSW Message)
B162626O (2)Ignition Switch Control Unit No Response
B162727O (2)RF Unit 1 Not Connected
B162828O (2)RF Unit 2 Not Connected
B164040O (2)RF Unit 1 Circuit Malfunction
B164141O (2)RF Unit 2 Circuit Malfunction
B164545O (2)Driver's Door LF Antenna Circuit Short
B164646O (2)Driver's Door LF Antenna Circuit Open
B164747O (2)Passenger's Door LF Antenna Circuit Short
B164848O (2)Passenger's Door LF Antenna Circuit Open
B165757O (2)Rear Bumper LF Antenna Circuit Short
B165858O (2)Rear Bumper LF Antenna Circuit Open
B165959O (2)Front Interior LF Antenna Circuit Short
B166060O (2)Front Interior LF Antenna Circuit Open
B166363O (2)Rear Interior LF Antenna Circuit Short
B166464O (2)Rear Interior LF Antenna Circuit Open
B166767O (2)Rear Shelf LF Antenna Circuit Short
B166868O (2)Rear Shelf LF Antenna Circuit Open
B167171O (2)Ignition Switch Control Unit (KEY SW Line) Circuit Open
B167272O (2)Ignition Switch Control Unit (KNOB SW) Circuit Short
B167373O (2)Ignition Switch Control Unit (KNOB SW) Circuit Open
B167474O (2)Ignition Switch Control Unit (ROTATE SW) Circuit Short
B167575O (2)Ignition Switch Control Unit (ROTATE SW) Circuit Open
(1) Refer to DTC B1050: COMMUNICATION BUS LINE ERROR; DTC B1150: COMMUNICATION BUS LINE ERROR; DTC B1200: COMMUNICATION BUS LINE ERROR; DTC B1250: COMMUNICATION BUS LINE ERROR; DTC B1400: COMMUNICATION BUS LINE ERROR; DTC B1600: COMMUNICATION BUS LINE ERROR; DTC B1750: COMMUNICATION BUS LINE ERROR; DTC B1800: COMMUNICATION BUS LINE ERROR; DTC B2100: COMMUNICATION BUS LINE ERROR; DTC B2150: COMMUNICATION BUS LINE ERROR (2) The keyless access indicator comes on when any malfunction is detected. With the ignition switch OFF, the keyless access indicator comes on for 3 seconds when any malfunction is detected.
(2)The keyless access indicator comes on when any malfunction is detected. With the ignition switch OFF, the keyless access indicator comes on for 3 seconds when any malfunction is detected.

DTC INDEX

DTC B1601: Keyless Access Control Unit Internal (CPU) Error; DTC B1602: Keyless Access Control Unit Internal (EEPROM) Error

  1. Disconnect the battery terminal for 10 seconds to clear the DTCs, then reconnect the battery terminal.
  2. Touch the door outer handle switch to lock the door.
  3. Touch the door outer handle switch to unlock the door.
  4. Connect the HDS to the data link connector.
  5. Turn the ignition switch OFF, and then back ON (II).
  6. Check for DTCs with the HDS. Is DTC B1601 and/or B1602 indicated? YES - Replace the keyless access control unit. NO - Intermittent failure, the system is OK at this time. Check for loose or poor connections.

DTC B1605: Keyless Access Control Unit Lost Communication with MICU (MICU Message)

  1. Clear the DTCs with the HDS.
  2. Touch the door outer handle switch to lock the door.
  3. Check for DTCs with the HDS. Is DTC B1605 indicated? YES - Go to step 4. NO - Intermittent failure, the system is OK at this time. Check for loose or poor connections.
  4. Check for DTCs with the HDS. Are DTCs B1055, B1157, B1255, B1806, B2107, and B2155 also indicated? YES - Do the MICU input test (see «MICU INPUT TEST»(/acura/rl/ii-2004-2008/remont/communication-devices/#multiplex-integrated-control-system__micu-input-test) ). NO - Replace the keyless access control unit.

DTC B1610: Keyless Access Control Unit Lost Communication with Gauge Control Module (VSP/NE Message)

  1. Clear the DTCs with the HDS.
  2. Touch the door outer handle switch to lock the door.
  3. Check for DTCs with the HDS. Is DTC B1610 indicated? YES - Go to step 4. NO - Intermittent failure, the system is OK at this time. Check for loose or poor connections.
  4. Check for DTCs with the HDS. Are DTCs B1011, B1060, B1205, B1405, B1805, and B2160 also indicated? YES - Do the gauge control module input test (see «GAUGE CONTROL MODULE INPUT TEST»(/acura/rl/ii-2004-2008/remont/communication-devices/#multiplex-integrated-control-system__gauge-control-module-input-test) ). NO - Replace the keyless access control unit.

DTC B1613: Keyless Access Control Unit Lost Communication with Driver's MPCS Unit (DOOR SW Message); DTC B1614: Keyless Access Control Unit Lost Communication with Driver's MPCS Unit (DRLOCKSW Message); DTC B1615: Keyless Access Control Unit Lost Communication with Driver's MPCS Unit (ASLOCKSW Message)

  1. Clear the DTCs with the HDS.
  2. Touch the door outer handle switch to lock the door.
  3. Check for DTCs with the HDS. Is DTC B1613, B1614, and/or B1615 indicated? YES - Go to step 4. NO - Intermittent failure, the system is OK at this time. Check for loose or poor connections.
  4. Check for DTCs with the HDS. Are DTCs B1013, B1014, B1015, B1064, B1065, B1181, B1182, B1405*, B1406*, B1407*, and B1811 also indicated? (* : '05-06 models) YES - Do the driver's MPCS unit input test (see «DRIVER'S MPCS UNIT INPUT TEST»(/acura/rl/ii-2004-2008/remont/communication-devices/#multiplex-integrated-control-system__drivers-mpcs-unit-input-test) ). NO - Replace the keyless access control unit.

Scheme 5

Scheme 5: DTC B1626: Ignition Switch Control Unit No Response
Scheme 5: DTC B1626: Ignition Switch Control Unit No Response

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Scheme 8

Scheme 9

Scheme 9
Scheme 9

Scheme 10

Scheme 10
Scheme 10

Scheme 11

Scheme 11
Scheme 11
  1. Clear the DTCs with the HDS.
  2. Select the MODE MENU from the HDS.
  3. Do the SELF CHECK.
  4. Check for DTCs with the HDS. Is DTC B1626 indicated? YES - Go to step 5. NO - Intermittent failure, the ignition switch control unit is OK at this time. Check for loose or poor connections at the ignition switch control unit connector.
  5. Register the ignition switch control unit with the HDS.
  6. Turn the ignition switch OFF, and then back ON (II).
  7. Repeat step 6 nine times.
  8. Check for DTCs with the HDS. Is DTC B1626 indicated? YES - Go to step 9. NO - Intermittent failure, the ignition switch control unit is OK at this time. Check for loose or poor connections at the ignition switch control unit connector.
  9. Turn the ignition switch OFF.
  10. Disconnect the ignition switch control unit 10P connector.
  11. Turn the ignition switch ON (II).
  12. Measure the voltage between the ignition switch control unit 10P connector terminal No. 9 and body ground. Is there battery voltage? YES - Go to step 13. NO - Check the No. 7 (10A) fuse in the driver's under-dash fuse/relay box. If the fuse is OK, check for an open in the wire between the driver's under-dash fuse/relay box and the ignition switch control unit.
  13. Turn the ignition switch OFF.
  14. Check for continuity between ignition switch control unit 10P connector terminal No. 6 and body ground. Is there continuity? YES - Go to step 15. NO - Repair an open in the wire or a poor ground (G501).
  15. Disconnect keyless access control unit connector A (31P).
  16. Check for continuity between the following ignition switch control unit 10P connector terminals and keyless access control unit connector A (31P) terminals: CONTINUITY CHART IGNITION SWITCH CONTROL UNIT KEYLESS ACCESS CONTROL UNIT CONNECTOR A (31P) No. 3 No. 13 No. 4 No. 26 No. 5 No. 8 No. 7 No. 4 No. 8 No. 3 Is there continuity? YES - Go to step 17. NO - Repair an open in the wire.
  17. Check for continuity between body ground and ignition switch control unit 10P connector terminals No. 3, No. 4, No. 5, No. 7, and No. 8 individually. Is there continuity? YES - Repair a short to ground in the wire. NO - Go to step 18.
  18. Reconnect keyless access control unit connector A (31P).
  19. Connect the voltmeter between ignition switch control unit 10P connector terminal No. 5 and body ground.
  20. Turn the ignition switch ON (II).
  21. Select the FUNCTION TEST from the HDS MODE MENU, and do the IGNTRX LINE DRIVING. Does the voltage change from about 12V to 0V? YES - Go to step 22. NO - Replace the keyless access control unit.
  22. Connect the voltmeter between ignition switch control unit 10P connector terminal No. 4 and body ground.
  23. Select the FUNCTION TEST MENU from the HDS, and do the IGNCONT LINE DRIVING. Does the voltage change from 0 to 5 V? YES - Replace the ignition switch control unit. NO - Replace the keyless access control unit.

Scheme 12

Scheme 12: DTC B1627: RF Unit 1 Not Connected; DTC B1640: RF Unit 1 Circuit Malfunction
Scheme 12: DTC B1627: RF Unit 1 Not Connected; DTC B1640: RF Unit 1 Circuit Malfunction

Scheme 13

Scheme 13
Scheme 13

Scheme 14

Scheme 14
Scheme 14

Scheme 15

Scheme 15
Scheme 15

Scheme 16

Scheme 16
Scheme 16

Scheme 17

Scheme 17
Scheme 17
  1. Clear the DTCs with the HDS.
  2. Select the TROUBLE CODE MENU from the HDS, then enter the SELF CHECK.
  3. Do the SELF CHECK.
  4. Check for DTCs with the HDS. Is DTC B1627 and/or B1640 indicated? YES - Go to step 5. NO - Go to step 11 .
  5. Turn the ignition switch OFF.
  6. Disconnect the RF unit 1 6P connector.
  7. Disconnect keyless access control unit connector C (17P).
  8. Check for continuity between the following RF unit 1 6P connector terminals and keyless access control unit connector C (17P) terminals. CONTINUITY CHART RFUNIT1 KEYLESS ACCESS CONTROL UNIT CONNECTOR C(17P) No. 1 No. 1 No. 2 No. 9 No. 3 No. 14 No. 4 No. 13 No. 5 No. 7 No. 6 No. 8 Is there continuity? YES - Go to step 9. NO - Repair an open in the wire.
  9. Check for continuity between body ground and RF unit 1 6P connector terminals No. 1, No. 2, No. 3, No. 4, No. 5, and No. 6 individually. Is there continuity? YES - Repair a short to ground in the wire. NO - Go to step 10.
  10. Reconnect the RF unit 1 6P connector and keyless access control unit connector C (17P).
  11. Connect the voltmeter between RF unit 1 6P connector terminal No. 5 and body ground.
  12. Select the FUNCTION TEST MENU from the HDS, and do the RF1 RXVCC DRIVING. Does the voltage change from 0 to about 5 V? YES - Go to step 13. NO - Replace the keyless access control unit.
  13. Connect the voltmeter between RF unit 1 6P connector terminal No. 6 and body ground.
  14. Select the FUNCTION TEST MENU from the HDS, and do the RF1 TXVCC DRIVING. Does the voltage change from 0 to about 5 V? YES - Go to step 15. NO - Replace the keyless access control unit.
  15. Connect the voltmeter between RF unit 1 6P connector terminal No. 3 and body ground.
  16. Select the FUNCTION TEST MENU from the HDS, and do the RF1 TXDDC OUTPUT. Does the voltage change from 0 to about 5 V? YES - Replace the RF unit 1. NO - Replace the keyless access control unit.

Scheme 18

Scheme 18: DTC B1628: RF Unit 2 Not Connected; DTC B1641: RF Unit 2 Circuit Malfunction
Scheme 18: DTC B1628: RF Unit 2 Not Connected; DTC B1641: RF Unit 2 Circuit Malfunction

Scheme 19

Scheme 19
Scheme 19

Scheme 20

Scheme 20
Scheme 20

Scheme 21

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Scheme 22

Scheme 22
Scheme 22

Scheme 23

Scheme 23
Scheme 23
  1. Clear the DTCs with the HDS.
  2. Select the TROUBLE CODE MENU from the HDS, then enter the SELF CHECK.
  3. Do the SELF CHECK.
  4. Check for DTCs with the HDS. Are DTC B1628 and/or B1641 indicated? YES - Go to step 5. NO - Go to step 11 .
  5. Turn the ignition switch OFF.
  6. Disconnect the RF unit 2 6P connector.
  7. Disconnect keyless access control unit connector B (24P).
  8. Check for continuity between the following RF unit 2 6P connector terminals and keyless access control unit connector B (24P) terminals. CONTINUITY CHART RFUNIT2 KEYLESS ACCESS CONTROL UNIT CONNECTOR B (24P) No. 1 No. 8 No. 2 No. 17 No. 3 No. 19 No. 4 No. 18 No. 5 No. 9 No. 6 No. 10 Is there continuity? YES - Go to step 9. NO - Repair an open in the wire.
  9. Check for continuity between body ground and RF unit 2 6P connector terminals No. 1, No. 2, No. 3, No. 4, No. 5, and No. 6 individually. Is there continuity? YES - Repair a short to ground in the wire. NO - Go to step 10.
  10. Reconnect the RF unit 2 6P connector and keyless access control unit connector B (24P).
  11. Connect the voltmeter between RF unit 2 6P connector terminal No. 5 and body ground.
  12. Select the FUNCTION TEST MENU from the HDS, and do the RF2 RXVCC DRIVING. Does the voltage change from 0 to about 5 V? YES - Go to step 13. NO - Replace the keyless access control unit.
  13. Connect the voltmeter between RF unit 2 6P connector terminal No. 6 and body ground.
  14. Select the FUNCTION TEST MENU from the HDS, and do the RF2 TXVCC DRIVING. Does the voltage change from 0 to about 5 V? YES - Go to step 15. NO - Replace the keyless access control unit.
  15. Connect the voltmeter between RF unit 2 6P connector terminal No. 3 and body ground.
  16. Select the FUNCTION TEST MENU from the HDS, and do the RF2 TXD DRIVING. Does the voltage change from 0 to about 5 V? YES - Replace the RF unit 2. NO - Replace the keyless access control unit.

Scheme 24

Scheme 24: DTC B1645: Driver's Door LF Antenna Circuit Short
Scheme 24: DTC B1645: Driver's Door LF Antenna Circuit Short

Scheme 25

Scheme 25
Scheme 25
  1. Clear the DTCs with the HDS.
  2. Select the TROUBLE CODE MENU from the HDS, then enter the SELF CHECK.
  3. Do the SELF CHECK.
  4. Check for DTCs with the HDS. Is DTC B1645 indicated? YES - Go to step 5. NO - Intermittent failure, the system is OK at this time. Check for loose or poor connections at the keyless access control unit and driver's door LF antenna.
  5. Turn the ignition switch OFF.
  6. Disconnect keyless access control unit connector B (24P).
  7. Disconnect the driver's door LF antenna 8P connector.
  8. Check for continuity between body ground and the keyless access control unit connector B (24P) terminals No. 13 and No. 14 individually. Is there continuity? YES - Repair a short in the wire. NO - Go to step 9.
  9. Reconnect keyless access control unit connector B (24P).
  10. Connect the voltmeter between driver's door LF antenna 8P connector terminals No. 3 and No. 7.
  11. Turn the ignition switch ON (II).
  12. Select the FUNCTION TEST MENU from the HDS, and do the DRIVER'S ANTENNA DC OUTPUT. Is there voltage? YES - Replace the driver's door LF antenna. NO - Replace the keyless access control unit.

Scheme 26

Scheme 26: DTC B1646: Driver's Door LF Antenna Circuit Open
Scheme 26: DTC B1646: Driver's Door LF Antenna Circuit Open

Scheme 27

Scheme 27
Scheme 27

Scheme 28

Scheme 28
Scheme 28
  1. Clear the DTCs with the HDS.
  2. Select the TROUBLE CODE MENU from the HDS, then enter the SELF CHECK.
  3. Do the SELF CHECK.
  4. Check for DTCs with the HDS. Is DTC B1646 indicated? YES - Go to step 5. NO - Intermittent failure, the system is OK at this time. Check for loose or poor connections at the keyless access control unit and driver's door LF antenna.
  5. Turn the ignition switch OFF.
  6. Disconnect keyless access control unit connector B (24P).
  7. Disconnect the driver's door LF antenna 8P connector.
  8. Connect driver's door LF antenna 8P connector terminals No. 3 and No. 7 to body ground with jumper wires.
  9. Check for continuity between body ground and keyless access control unit connector B (24P) terminals No. 13 and No. 14 individually. Is there continuity? YES - Go to step 10. NO - Repair an open in the wire.
  10. Remove the jumper wires from the driver's door LF antenna 8P connector. Reconnect keyless access control unit connector B (24P).
  11. Connect the voltmeter between driver's door LF antenna 8P connector terminals No. 3 and No. 7.
  12. Turn the ignition switch ON (II).
  13. Select the FUNCTION TEST MENU from the HDS, and do the DRIVER'S ANTENNA DC OUTPUT. Is there voltage? YES - Replace the driver's door LF antenna. NO - Replace the keyless access control unit.

Scheme 29

Scheme 29: DTC B1647: Passenger's Door LF Antenna Circuit Short
Scheme 29: DTC B1647: Passenger's Door LF Antenna Circuit Short

Scheme 30

Scheme 30
Scheme 30
  1. Clear the DTCs with the HDS.
  2. Select the TROUBLE CODE MENU from the HDS, then enter the SELF CHECK.
  3. Do the SELF CHECK.
  4. Check for DTCs with the HDS. Is DTC B1647 indicated? YES - Go to step 5. NO - Intermittent failure, the system is OK at this time. Check for loose or poor connections at the keyless access control unit and passenger's door LF antenna.
  5. Turn the ignition switch OFF.
  6. Disconnect keyless access control unit connector C (17P).
  7. Disconnect the passenger's door LF antenna 8P connector.
  8. Check for continuity between body ground and keyless access control unit connector C (17P) terminals No. 6 and No. 12 individually. Is there continuity? YES - Repair a short to ground in the wire. NO - Go to step 9.
  9. Reconnect keyless access control unit connector C (17P).
  10. Connect the voltmeter between passenger's door LF antenna 8P connector terminals No. 3 and No. 7.
  11. Turn the ignition switch ON (II).
  12. Select the FUNCTION TEST MENU from the HDS, and do the FRONT PASSENGER ANTENNA DC OUTPUT. Is there voltage? YES - Replace the passenger's door LF antenna. NO - Replace the keyless access control unit.

Scheme 31

Scheme 31: DTC B1648: Passenger's Door LF Antenna Circuit Open
Scheme 31: DTC B1648: Passenger's Door LF Antenna Circuit Open

Scheme 32

Scheme 32
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Scheme 33

Scheme 33
Scheme 33
  1. Clear the DTCs with the HDS.
  2. Select the TROUBLE CODE MENU from the HDS, then enter the SELF CHECK.
  3. Do the SELF CHECK.
  4. Check for DTCs with the HDS. Is DTC B1648 indicated? YES - Go to step 5. NO - Intermittent failure, the system is OK at this time. Check for loose or poor connections at the keyless access control unit and passenger's door LF antenna.
  5. Turn the ignition switch OFF.
  6. Disconnect keyless access control unit connector C (17P).
  7. Disconnect the passenger's door LF antenna 8P connector.
  8. Connect passenger's door LF antenna 8P connector terminals No. 3 and No. 7 to body ground with jumper wires.
  9. Check for continuity between body ground and keyless access control unit connector C (17P) terminals No. 6 and No. 12 individually. Is there continuity? YES - Go to step 10. NO - Repair an open in the wire.
  10. Reconnect keyless access control unit connector C (17P).
  11. Connect the voltmeter between passenger's door LF antenna 8P connector terminals No. 3 and No. 7.
  12. Turn the ignition switch ON (II).
  13. Select the FUNCTION TEST MENU from the HDS, and do the PASSENGER'S ANTENNA DC OUTPUT. Is there voltage? YES - Replace the passenger's door LF antenna. NO - Replace the keyless access control unit.

Scheme 34

Scheme 34: DTC B1657: Rear Bumper LF Antenna Circuit Short
Scheme 34: DTC B1657: Rear Bumper LF Antenna Circuit Short

Scheme 35

Scheme 35
Scheme 35
  1. Clear the DTCs with the HDS.
  2. Select the TROUBLE CODE MENU from the HDS, then enter the SELF CHECK.
  3. Do the SELF CHECK.
  4. Check for DTCs with the HDS. Is DTC B1657 indicated? YES - Go to step 5. NO - Intermittent failure, the system is OK at this time. Check for loose or poor connections at the keyless access control unit and rear bumper LF antenna.
  5. Turn the ignition switch OFF.
  6. Disconnect keyless access control unit connector B (24P).
  7. Disconnect the rear bumper LF antenna 2P connector.
  8. Check for continuity between body ground and keyless access control unit connector B (24P) terminals No. 15 and No. 16 individually. Is there continuity? YES - Repair a short to ground in the wire. NO - Go to step 9.
  9. Reconnect keyless access control unit connector B (24P).
  10. Connect the voltmeter between rear bumper LF antenna 2P connector terminals No. 1 and No. 2.
  11. Turn the ignition switch ON (II).
  12. Select the FUNCTION TEST MENU from the HDS, and do the TRUNK/TAILGATE/REAR BUMPER ANTENNA L DC OUTPUT. Is there voltage? YES - Replace the rear bumper LF antenna. NO - Replace the keyless access control unit

Scheme 36

Scheme 36: DTC B1658: Rear Bumper LF Antenna Circuit Open
Scheme 36: DTC B1658: Rear Bumper LF Antenna Circuit Open

Scheme 37

Scheme 37
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Scheme 38

Scheme 38
Scheme 38
  1. Clear the DTCs with the HDS.
  2. Select the TROUBLE CODE MENU from the HDS, then enter the SELF CHECK.
  3. Do the SELF CHECK.
  4. Check for DTCs with the HDS. Is DTC B1658 indicated? YES - Go to step 5. NO - Intermittent failure, the system is OK at this time. Check for loose or poor connections at the keyless access control unit and rear bumper LF antenna.
  5. Turn the ignition switch OFF.
  6. Disconnect keyless access control unit connector B (24P).
  7. Disconnect the rear bumper LF antenna 2P connector.
  8. Connect rear bumper LF antenna 2P connector terminals No. 1 and No. 2 to body ground with jumper wires.
  9. Check for continuity between body ground and keyless access control unit connector B (24P) terminals No. 15 and No. 16 individually. Is there continuity? YES - Go to step 10. NO - Repair an open in the wire.
  10. Reconnect keyless access control unit connector B (24P).
  11. Connect the voltmeter between rear bumper LF antenna 2P connector terminals No. 1 and No. 2.
  12. Turn the ignition switch ON (II).
  13. Select the FUNCTION TEST MENU from the HDS, and do the TRUNK/TAILGATE/REAR BUMPER ANTENNA L DC OUTPUT. Is there voltage? YES - Replace the rear bumper LF antenna. NO - Replace the keyless access control unit.

Scheme 39

Scheme 39: DTC B1659: Front Interior LF Antenna Circuit Short
Scheme 39: DTC B1659: Front Interior LF Antenna Circuit Short

Scheme 40

Scheme 40
Scheme 40
  1. Clear the DTCs with the HDS.
  2. Select the TROUBLE CODE MENU from the HDS, then enter the SELF CHECK.
  3. Do the SELF CHECK.
  4. Check for DTCs with the HDS. Is DTC B1659 indicated? YES - Go to step 5. NO - Intermittent failure, the system is OK at this time. Check for loose or poor connections at the keyless access control unit and front interior LF antenna.
  5. Turn the ignition switch OFF.
  6. Disconnect keyless access control unit connector C (17P).
  7. Disconnect the front interior LF antenna 2P connector.
  8. Check for continuity between body ground and keyless access control unit connector C (17P) terminals No. 4 and No. 5 individually. Is there continuity? YES - Repair a short to ground in the wire. NO - Go to step 9.
  9. Reconnect keyless access control unit connector C (17P).
  10. Connect the voltmeter between the front interior LF antenna 2P connector terminals No. 1 and No. 2.
  11. Turn the ignition switch ON (II).
  12. Select the FUNCTION TEST MENU from the HDS, and do the FRONT INTERIOR ANTENNA L DC OUTPUT. Is there voltage? YES - Replace the front interior LF antenna. NO - Replace the keyless access control unit.

Scheme 41

Scheme 41: DTC B1660: Front Interior LF Antenna Circuit Open
Scheme 41: DTC B1660: Front Interior LF Antenna Circuit Open

Scheme 42

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Scheme 43

Scheme 43
Scheme 43
  1. Clear the DTCs with the HDS.
  2. Select the TROUBLE CODE MENU from the HDS, then enter the SELF CHECK.
  3. Do the SELF CHECK.
  4. Check for DTCs with the HDS. Is DTC B1660 indicated? YES - Go to step 5. NO - Intermittent failure, the system is OK at this time. Check for loose or poor connections at the keyless access control unit and front interior LF antenna.
  5. Turn the ignition switch OFF.
  6. Disconnect keyless access control unit connector C (17P).
  7. Disconnect the front interior LF antenna 2P connector.
  8. Connect front interior LF antenna 2P connector terminals No. 1 and No. 2 to body ground with jumper wires.
  9. Check for continuity between body ground and keyless access control unit connector C (17P) terminals No. 4 and No. 5 individually. Is there continuity? YES - Go to step 10. NO - Repair an open in the wire.
  10. Reconnect keyless access control unit connector C (17P).
  11. Connect the voltmeter between front interior LF antenna 2P connector terminals No. 1 and No. 2.
  12. Turn the ignition switch ON (II).
  13. Select the FUNCTION TEST MENU from the HDS, and do the FRONT INTERIOR ANTENNA L DC OUTPUT. Is there voltage? YES - Replace the front interior LF antenna. NO - Replace the keyless access control unit.

Scheme 44

Scheme 44: DTC B1663: Rear Interior LF Antenna Circuit Short
Scheme 44: DTC B1663: Rear Interior LF Antenna Circuit Short

Scheme 45

Scheme 45
Scheme 45
  1. Clear the DTCs with the HDS.
  2. Select the TROUBLE CODE MENU from the HDS, then enter the SELF CHECK.
  3. Do the SELF CHECK.
  4. Check for DTCs with the HDS. Is DTC B1663 indicated? YES - Go to step 5. NO - Intermittent failure, the system is OK at this time. Check for loose or poor connections at the keyless access control unit and rear interior antenna.
  5. Turn the ignition switch OFF.
  6. Disconnect keyless access control unit connector B (24P).
  7. Disconnect the rear interior LF antenna 2P connector.
  8. Check for continuity between body ground and keyless access control unit connector B (24P) terminals No. 2 and No. 3 individually. Is there continuity? YES - Repair a short to ground in the wire. NO - Go to step 9.
  9. Reconnect keyless access control unit connector B (24P).
  10. Connect the voltmeter between rear interior LF antenna 2P connector terminals No. 1 and No. 2.
  11. Turn the ignition switch ON (II).
  12. Select the FUNCTION TEST MENU from the HDS, and do the REAR INTERIOR ANTENNA L DC OUTPUT. Is there voltage? YES - Replace the rear interior LF antenna. NO - Replace the keyless access control unit.

Scheme 46

Scheme 46: DTC B1664: Rear Interior LF Antenna Circuit Open
Scheme 46: DTC B1664: Rear Interior LF Antenna Circuit Open

Scheme 47

Scheme 47
Scheme 47

Scheme 48

Scheme 48
Scheme 48
  1. Clear the DTCs with the HDS.
  2. Select the TROUBLE CODE MENU from the HDS, then enter the SELF CHECK.
  3. Do the SELF CHECK.
  4. Check for DTCs with the HDS. Is DTC B1664 indicated? YES - Go to step 5. NO - Intermittent failure, the system is OK at this time. Check for loose or poor connections at the keyless access control unit and rear interior LF antenna.
  5. Turn the ignition switch OFF.
  6. Disconnect keyless access control unit connector B (24P).
  7. Disconnect the rear interior LF antenna 2P connector.
  8. Connect rear interior LF antenna 2P connector terminals No. 1 and No. 2 to body ground with jumper wires.
  9. Check for continuity between body ground and keyless access control unit connector B (24P) terminals No. 2 and No. 3 individually. Is there continuity? YES - Go to step 10. NO - Repair an open in the wire.
  10. Reconnect keyless access control unit connector B (24P).
  11. Connect the voltmeter between rear interior LF antenna 2P connector terminals No. 1 and No. 2.
  12. Turn the ignition switch ON (II).
  13. Select the FUNCTION TEST MENU from the HDS, and do the REAR INTERIOR ANTENNA L DC OUTPUT. Is there voltage? YES - Replace the rear interior LF antenna. NO - Replace the keyless access control unit.

Scheme 49

Scheme 49: DTC B1667: Rear Shelf LF Antenna Circuit Short
Scheme 49: DTC B1667: Rear Shelf LF Antenna Circuit Short

Scheme 50

Scheme 50
Scheme 50
  1. Clear the DTCs with the HDS.
  2. Select the TROUBLE CODE MENU from the HDS, then enter the SELF CHECK.
  3. Do the SELF CHECK.
  4. Check for DTCs with the HDS. Is DTC B1667 indicated? YES - Go to step 5. NO - Intermittent failure, the system is OK at this time. Check for loose or poor connections at the keyless access control unit and rear shelf LF antenna.
  5. Turn the ignition switch OFF.
  6. Disconnect keyless access control unit connector B (24P).
  7. Disconnect the rear shelf LF antenna 2P connector.
  8. Check for continuity between body ground and keyless access control unit connector B (24P) terminals No. 4 and No. 5 individually. Is there continuity? YES - Repair a short to ground in the wire. NO - Go to step 9.
  9. Reconnect keyless access control unit connector B (24P).
  10. Connect the voltmeter between rear shelf LF antenna 2P connector terminals No. 1 and No. 2.
  11. Turn the ignition switch ON (II).
  12. Select the FUNCTION TEST MENU from the HDS, and do the TRUNK ROOM ANTENNA L DC OUTPUT. Is there voltage? YES - Replace the rear shelf LF antenna. NO - Replace the keyless access control unit.

Scheme 51

Scheme 51: DTC B1668: Rear Shelf LF Antenna Circuit Open
Scheme 51: DTC B1668: Rear Shelf LF Antenna Circuit Open

Scheme 52

Scheme 52
Scheme 52

Scheme 53

Scheme 53
Scheme 53
  1. Clear the DTCs with the HDS.
  2. Select the TROUBLE CODE MENU from the HDS, then enter the SELF CHECK.
  3. Do the SELF CHECK.
  4. Check for DTCs with the HDS. Is DTC B1668 indicated? YES - Go to step 5. NO - Intermittent failure, the system is OK at this time. Check for loose or poor connections at the keyless access control unit and rear shelf LF antenna.
  5. Turn the ignition switch OFF.
  6. Disconnect keyless access control unit connector B (24P).
  7. Disconnect the rear shelf LF antenna 2P connector.
  8. Connect rear shelf LF antenna 2P connector terminals No. 1 and No. 2 to body ground with jumper wires.
  9. Check for continuity between body ground and keyless access control unit connector B (24P) terminals No. 4 and No. 5 individually. Is there continuity? YES - Go to step 10. NO - Repair an open in the wire.
  10. Reconnect keyless access control unit connector B (24P).
  11. Connect the voltmeter between rear shelf LF antenna 2P connector terminals No. 1 and No. 2.
  12. Turn the ignition switch ON (II).
  13. Select the FUNCTION TEST MENU from the HDS, and do the TRUNK ROOM ANTENNA L DC OUTPUT. Is there voltage? YES - Replace the rear shelf LF antenna. NO - Replace the keyless access control unit.

Scheme 54

Scheme 54: DTC B1671: Ignition Switch Control Unit (KEY SW) Circuit Open
Scheme 54: DTC B1671: Ignition Switch Control Unit (KEY SW) Circuit Open

Scheme 55

Scheme 55
Scheme 55
  1. Clear the DTCs with the HDS.
  2. Turn the build-in switch OFF.
  3. Insert the build-in key into the ignition key switch.
  4. Turn the ignition switch ON (II) and OFF ten times using the ignition key.
  5. Check for DTCs with the HDS. Is DTC B1671 indicated? YES - Go to step 6. NO - Intermittent failure, the system is OK at this time. Check for loose or poor connections at the keyless access control unit and at the ignition switch control unit.
  6. Turn the ignition switch OFF.
  7. Disconnect keyless access control unit connector A (31P).
  8. Disconnect the ignition switch control unit 10P connector.
  9. Check for continuity between keyless access control unit connector A (31P) terminal No. 13 and ignition switch control unit 10P connector terminal No. 3. Is there continuity? YES - Go to step 10. NO - Repair an open in the wire.
  10. With the build-in key inserted, check for continuity between ignition switch control unit 10P connector terminals No. 3 and No. 6. Is there continuity? YES - Replace the keyless access control unit. NO - Replace the ignition switch control unit.

Scheme 56

Scheme 56: DTC B1672: Ignition Switch Control Unit (KNOB SW) Circuit Short
Scheme 56: DTC B1672: Ignition Switch Control Unit (KNOB SW) Circuit Short

Scheme 57

Scheme 57
Scheme 57
  1. Clear the DTCs with the HDS.
  2. Turn the build-in switch OFF.
  3. Insert the build-in key into the ignition key switch.
  4. Turn the ignition switch ON (II) and OFF ten times using the ignition key.
  5. Check for DTCs with the HDS. Is DTC B1672 indicated? YES - Go to step 6. NO - Intermittent failure, the system is OK at this time. Check for loose or poor connections at the keyless access control unit and at the ignition switch control unit.
  6. Turn the ignition switch OFF.
  7. Disconnect keyless access control unit connector A (31P).
  8. Disconnect the ignition switch control unit 10P connector.
  9. Check for continuity between ignition switch control unit 10P connector terminal No. 7 and body ground. Is there continuity? YES - Repair a short in the wire. NO - Go to step 10.
  10. Remove the build-in key from the ignition switch.
  11. Check for continuity between ignition switch control unit 10P connector terminals No. 7 and No. 6. Is there continuity? YES - Replace the ignition switch control unit. NO - Replace the keyless access control unit.

Scheme 58

Scheme 58: DTC B1673: Ignition Switch Control Unit (KNOB SW) Circuit Open
Scheme 58: DTC B1673: Ignition Switch Control Unit (KNOB SW) Circuit Open

Scheme 59

Scheme 59
Scheme 59
  1. Clear the DTCs with the HDS.
  2. Turn the built-in switch OFF.
  3. Insert the built-in key into the ignition switch.
  4. Turn the ignition switch GN (II) and OFF ten times using the ignition key.
  5. Check for DTCs with the HDS. Is DTC B1673 indicated? YES - Go to step 6. NO - Intermittent failure, the system is OK at this time. Check for loose or poor connections at the keyless access control unit and at the ignition switch control unit.
  6. Turn the ignition switch OFF.
  7. Disconnect keyless access control unit connector A (31P).
  8. Disconnect the ignition switch control unit 10P connector.
  9. Check for continuity between keyless access control unit connector A (31P) terminal No. 4 and ignition switch control unit 10P connector terminal No. 7. Is there continuity? YES - Go to step 10. NO - Repair an open in the wire.
  10. Remove the built-in key from the ignition switch.
  11. With the ignition knob pushed, check for continuity between ignition switch control unit 10P connector terminals No. 7 and No. 6. Is there continuity? YES - Replace the keyless access control unit. NO - Replace the ignition switch control unit.

Scheme 60

Scheme 60: DTC B1674: Ignition Switch Control Unit (ROTATE SW) Circuit Short
Scheme 60: DTC B1674: Ignition Switch Control Unit (ROTATE SW) Circuit Short

Scheme 61

Scheme 61
Scheme 61
  1. Clear the DTCs with the HDS.
  2. Turn the built-in switch OFF.
  3. Insert the built-in key into the ignition switch.
  4. Turn the ignition switch ON (II) and OFF ten times using the ignition key.
  5. Check for DTCs with the HDS. Is DTC B1674 indicated? YES - Go to step 6. NO - Intermittent failure, the system is OK at this time. Check for loose or poor connections at the keyless access control unit and at the ignition switch control unit.
  6. Turn the ignition switch OFF.
  7. Disconnect keyless access control unit connector A (31P).
  8. Disconnect the ignition switch control unit 10P connector.
  9. Check for continuity between ignition switch control unit 10P connector terminal No. 8 and body ground. Is there continuity? YES - Repair a short to ground in the wire. NO - Go to step 10.
  10. Check for continuity between ignition switch control unit 10P connector terminals No. 8 and No. 6. Is there continuity? YES - Replace the ignition switch control unit. NO - Replace the keyless access control unit.

Scheme 62

Scheme 62: DTC B1675: Ignition Switch Control Unit (ROTATE SW) Circuit Open
Scheme 62: DTC B1675: Ignition Switch Control Unit (ROTATE SW) Circuit Open

Scheme 63

Scheme 63
Scheme 63
  1. Clear the DTCs with the HDS.
  2. Turn the ignition switch OFF.
  3. Insert the built-in key into the ignition switch.
  4. Turn the ignition switch ON (II) and OFF ten times using the built-in key.
  5. Check for DTCs with the HDS. Is DTC B1675 indicated? YES - Go to step 6. NO - Intermittent failure, the system is OK at this time. Check for loose or poor connections at the keyless access control unit and at the ignition switch control unit.
  6. Turn the ignition switch OFF.
  7. Disconnect keyless access control unit connector A (31P).
  8. Disconnect the ignition switch control unit 10P connector.
  9. Check for continuity between keyless access control unit connector A (31P) terminal No. 3 and ignition switch control unit 10P connector terminal No. 8. Is there continuity? YES - Go to step 10. NO - Repair an open in the wire.
  10. Turn the ignition switch to the ACC (I) position.
  11. Check for continuity between ignition switch control unit 10P connector terminals No. 8 and No. 6. Is there continuity? YES - Replace the keyless access control unit. NO - Replace the ignition switch control unit.

Scheme 64

Scheme 64: Symptom Troubleshooting Information
Scheme 64: Symptom Troubleshooting Information
  1. Symptom Troubleshooting by the Immobilizer Indicator. The immobilizer and keyless access system condition can be checked by the immobilizer indicator lighting pattern. Normal operation: When the ignition switch is turned ON (II) and the immobilizer code is identified, the immobilizer indicator comes on for 2 seconds, then goes off. The immobilizer indicator blinks five times when the ignition switch is turned OFF. +B line open: When the ignition switch is turned ON (II) and the immobilizer code is identified, the immobilizer indicator comes on for 2 seconds, then goes off. The immobilizer indicator goes off when the ignition switch is turned OFF. Immobilizer code is not identified: When the ignition switch is turned ON (II) but the immobilizer code is not identified, the immobilizer indicator comes on for 2 seconds, then blinks. The state of the keyless registration and IMOCD (S-net) line can be checked by doing a system check and status log checks with the HDS. The immobilizer indicator goes off when the ignition switch is turned OFF. Immobilizer indicator does not come on: If the immobilizer indicator does not come on when the ignition switch is turned ON (II), check for an open in the wire shown: When the built-in key is used: Check for continuity between the immobilizer control unit-receiver and the keyless access control unit Check for power to the keyless access control unit IG1 and IG2 line. Check for continuity between the immobilizer control unit-receiver and the gauge control module (IMOLMP line). When the remote is used: Check for power to the keyless access control unit IG1 and IG2 line. Check for continuity between the immobilizer control unit-receiver and the gauge control module (IMOLMP line). Check for continuity between the keyless access control unit and body ground. NOTE: If the ignition switch is faulty (a short to power in the wire), the immobilizer code identification is not performed, so the indicator does not come on. But the engine is able to start in this condition. Immobilizer indicator does not go off: If the immobilizer indicator does not go off after the ignition switch is turned ON (II), check for a short in the wire shown: Check for continuity between the immobilizer control unit-receiver and the gauge control module. Check for continuity between the keyless access control unit and the gauge control module.
  2. Symptom Troubleshooting of an open power supply and ground circuit. If a malfunction occurs in the immobilizer or keyless access system circuit power supply and ground lines, identify the lines to check with this table
  3. General Check before Troubleshooting. Before troubleshooting the keyless access system, verify the following items and solve it if applicable. Check the DTCs with the HDS, if the DTC is indicated, troubleshoot the DTC first. Make sure the remote is not in a purse with coins, wrapped with any metal material, place near a mobile phone or computer. Make sure the vehicle battery is fully charged. Make sure the remote batteries are not low; replace the battery. Make sure a different remote is not being used; only use the Acura-approved key. Make sure the remote is not attached to a key ring or key case, remove the key from it. Make sure aftermarket accessories are not installed: remove any aftermarket accessories. Make sure aftermarket accessories are not connected to the IMOCD (S-NET) line: disconnect any aftermarket accessories from the IMOCD (S-NET) line. Make sure there is no electrical interference nearby: avoid areas with electrical interference.
  4. How to Troubleshoot without the Built-in Key. Connect the HDS to the data link connector, then turn the ignition switch ON (II) with the remote. Check the system checks 1 and 2 and status log by the HDS. Check the DTCs
  5. System Checks. If a System Check 1 or 2 result is indicated on the display of the HDS, troubleshoot the items based on these Check tables. System Check 1 SYSTEM CHECK CHART System Check No. Possible cause Check items A-2 Remote is mismatched Remote test LF interior antennas test Continuity check in the wire between the keyless access control unit and RF units Replace RF unit A-3 Operated without Remote B-1 PCM is replaced Register the PCM B-2 PCM is not registered correctly. Communication error caused by low battery voltage between the PCM and the keyless access control unit Check for loose or poor connections at the (IMOCD (S-NET)) G-1 Check for loose or poor connections at the (IMOCD (S-NET)) C-1 Imoes unit is not registered correctly Register the imoes unit C-2 Imoes unit is not registered correctly Check for an open or a short in the wire (IMOCD (S-NET)), if OK, check pinfits and connections at the (IMOCD (S-NET)) Communication error caused by low battery voltage between the imoes unit and the keyless access control unit Communication error caused by electrical noise between the imoes unit and the keyless access control unit C-3 G-5 Ignition switch control unit is not registered correctly Register the ignition knob ECU C-4 Ignition switch control unit is not registered correctly Check for an open or a short in the wire (IGNTRX line), if OK, check for loose or poor connections at the (IMOCD (S-NET)) Communication error caused by low battery voltage between the ignition switch control unit and the keyless access control unit Communication error caused by electrical wave noise between the ignition switch control unit and the keyless access control unit System Check 2 SYSTEM CHECK CHART System Check No. Possible cause Check items D-1 IMOCD (S-NET) line short Check for a short in the wire (IMOCD (S-NET)) Communication error caused by low battery voltage between the PCM and the keyless access control unit Communication error caused by electrical noise between the PCM and the keyless access control unit D-2 Blown fuse Blown fuse Checkforanopen in the wire (IMOCD (S-NET)) Open in the wire between the imoes unit and the keyless access control unit Communication error caused by low battery voltage between the imoes unit and the keyless access control unit Communication error caused by electrical noise between the imoes unit and the keyless access control unit D-3 Blown fuse Continuity for an open or a short in the wire (IMOCD (S-NET)) between the keyless access control unit and RF units Check the PCM Open in the wire between the PCM and the keyless access control unit Communication error caused by low battery voltage between the PCM and the keyless access control unit Communication error caused by electrical noise between the PCM and the keyless access control unit D-4 IGNTRX line short Check for a short in the wire (IGNTRX line) Faulty ignition switch control unit D-5 IGNTRX line open Check for an open in the wire (IGNTRX line) Faulty ignition switch control unit G-2 Keyless access control unit is replaced Register the immobilizer control unit-receiver Register the imoes unit G-3 Imoes unit is replaced
  6. Status Log. If the symptom does not occur again during the symptom check, check the Status Log with the HDS, and troubleshoot the items based on this table: Check the status log count. Troubleshoot the status with the highest count first. If no counts are listed, the keyless access system is OK. Continue with normal symptom troubleshooting. STATUS LOG CHART Status Log No. Possible cause B-1 PCM was not registered correctly. Low battery voltage Poor connections or loose terminals at the keyless access control unit Electrical noise B-2 PCM was not registered correctly Low battery voltage Poor connections or loose terminals at the keyless access control unit Electrical noise C-1 Imoes unit was not registered correctly. Low battery voltage Poor connections or loose terminals at the keyless access control unit Electrical noise C-2 Imoes unit was not registered correctly Low battery voltage Poor connections or loose terminals at the keyless access control unit Electrical noise D-1 Low battery voltage Poor connections or loose terminals between the immobilizer control unit-receiver and the PCM Electrical noise D-2 Blown fuse An open in the wire between the imoes unit and the immobilizer control unit-receiver Faulty keyless access control unit Low battery voltage Poor connections or loose terminals between the imoes unit and the PCM Electrical noise D-3 Blown fuse An open or a short in the wire between the keyless access control unit and the PCM Low battery voltage Poor connections or loose terminals between the keyless access control unit and the PCM Electrical noise

Engine does not start with the remote

Note. Before troubleshooting, verify the items listed in "General Check before Troubleshooting".

  1. Carry the remote in the vehicle, and push the ignition knob.
  2. Check for the LED indication of the remote. Does the LED blink? YES - Go to step 3. NO - Go to step 7 .
  3. Push the ignition knob five times while turning the steering slightly right and left. Does the ignition knob turn? YES - Go to step 4. NO - Go to step 8 .
  4. Check the starter operation. Does the starter run? YES - Go to step 5. NO - Check the starting system.
  5. Try to start the engine. Does the engine start? YES - Go to step 6. NO - Go to step 10 .
  6. Try to stop the engine. Does the engine stop? YES - Go to step 10. NO - Go to the Status Log (see step 6 ).
  7. Remove the remote batteries, then install them again. Does the LED blink when the batteries are installed? YES - Check for an open in these wires: Keyless access control unit +B1 and +B2 lines. GND (LG1 and LG2) lines. NO - Replace the remote batteries and recheck the system.
  8. Check the No. 7 (10A) fuse in the driver's under-dash fuse/relay box. Is the fuse good? YES - Go to step 9. NO - Replace the fuse and recheck.
  9. Check the keyless access system DTCs with the HDS. Are any DTCs indicated? YES - Go to the indicated DTCs troubleshooting. NO - Go to System Check (see step 5 ).
  10. Check the immobilizer indicator lighting pattern. Does the immobilizer indicator work normally? YES - The keyless access system is OK at this time, check the engine system. NO - Refer to the appropriate «SYMPTOM TROUBLESHOOTING»(/acura/rl/ii-2004-2008/remont/door-locks-anti-theft-systems/#keyless-access-system) .

Keyless Access Indicator Circuit Troubleshooting

Normal operation: The keyless access indicator comes on for 2 seconds when the ignition switch is turned ON (II), then turned OFF.

Note. If the keyless access control unit is new and not registered, the keyless access indicator comes on and stays on until the immobilizer code is registered. If a new keyless access control unit is used without registration, the keyless access indicator comes on.

Scheme 65

Scheme 65: Keyless Access Indicator Circuit Troubleshooting
Scheme 65: Keyless Access Indicator Circuit Troubleshooting

Scheme 66

Scheme 66
Scheme 66

Scheme 67

Scheme 67
Scheme 67
  1. Turn the ignition switch OFF, and then back ON (II).
  2. Check the keyless access indicator. Does the keyless access indicator come on for 2 seconds, then go off? YES - The system is OK at this time. NO - If the indicator does not come on, go to step 3. If the indicator stays on, go to step 15 .
  3. Turn the ignition switch OFF.
  4. Connect the HDS to the data link connector (DLC).
  5. Select the FUNCTION TEST MENU, then enter the KEYLESS ACCESS INDICATOR DRIVING.
  6. Check the keyless access indicator operation. Does the keyless access indicator come on? YES - Replace the keyless access control unit. NO - Go to step 7.
  7. Check the other indicators in the gauge control module. Do the other indicators come on? YES - Go to step 8. NO - Do to the gauge control module input test (see «GAUGE CONTROL MODULE INPUT TEST»(/acura/rl/ii-2004-2008/remont/communication-devices/#multiplex-integrated-control-system__gauge-control-module-input-test) ). If the input test is OK, replace the gauge control module.
  8. Turn the ignition switch OFF.
  9. Disconnect keyless access control unit connector A (31P) and gauge control module connector B (28P).
  10. Check for continuity between keyless access control unit connector A (31P) terminal No. 31 and gauge control module connector B (28P) terminal No. 10. Is there continuity? YES - Go to step 11. NO - Repair an open in the wire.
  11. Reconnect keyless access control unit connector A (31P).
  12. Connect an ohmmeter between gauge control module connector B (28P) terminal No. 10 and body ground.
  13. Turn the ignition switch ON (II).
  14. Select the FUNCTION TEST MENU, then enter the KEYLESS ACCESS INDICATOR DRIVING. Is there continuity while the FUNCTION TEST is on? YES - Replace the gauge control module. NO - Replace the keyless access control unit.
  15. Check for DTCs with the HDS. Are there any DTCs? YES - Go to the indicated DTC troubleshooting. NO - Go to step 16.
  16. Turn the ignition switch OFF.
  17. Disconnect keyless access control unit connector A (31P).
  18. Turn the ignition switch ON (II).
  19. Check the keyless access indicator operation. Does the keyless access indicator turn off? YES - Replace the keyless access control unit. NO - Go to step 20.
  20. Turn the ignition switch OFF.
  21. Disconnect gauge control module connector B (28P).
  22. Check for continuity between the keyless access control unit connector A (31P) terminal No. 31 and body ground. Is there continuity? YES - Repair a short to ground in the wire. NO - Replace the gauge control module.

Scheme 68

Scheme 68: Keyless Buzzer Circuit Troubleshooting
Scheme 68: Keyless Buzzer Circuit Troubleshooting

Scheme 69

Scheme 69
Scheme 69

Scheme 70

Scheme 70
Scheme 70

Scheme 71

Scheme 71
Scheme 71
  1. Connect the HDS to the data link connector (DLC).
  2. Turn the ignition switch ON (II).
  3. Check the "CUSTOMIZE SETUP" information on the multi-information display. Does the keyless buzzer (KEYLESS LOCK ACKNOWLEDGMENT) information indicate off? YES - Change to ON. NO - Go to step 4.
  4. Turn the ignition switch OFF.
  5. Disconnect the keyless buzzer 2P connector.
  6. Check for continuity between keyless buzzer 2P connector terminal No. 2 and body ground. Is there continuity? YES - Go to step 7. NO - Repair an open in the wire or poor ground (G701).
  7. Disconnect driver's under-dash fuse/relay box connector P (30P).
  8. Connect keyless buzzer 2P connector terminal No. 1 to body ground with a jumper wire.
  9. Check for continuity between driver's under-dash fuse/relay box connector P (30P) terminal No. 29 and body ground. Is there continuity? YES - Go to step 10. NO - Repair an open in the wire.
  10. Remove the jumper wire.
  11. Check for continuity between driver's under-dash fuse/relay box connector P (30P) terminal No. 29 and body ground. Is there continuity? YES - Repair short to ground in the wire. NO - Substitute a known-good keyless access control unit and recheck. If there is still a malfunction, MICU must be faulty, replace the driver's under-dash fuse/relay box.

Scheme 72

Scheme 72: Touch Sensor Circuit Troubleshooting
Scheme 72: Touch Sensor Circuit Troubleshooting

Scheme 73

Scheme 73
Scheme 73

Scheme 74

Scheme 74
Scheme 74

Scheme 75

Scheme 75
Scheme 75

Scheme 76

Scheme 76
Scheme 76

Scheme 77

Scheme 77
Scheme 77

Scheme 78

Scheme 78
Scheme 78
  1. Connect the HDS to the data link connector (DLC).
  2. Turn the ignition switch ON (II).
  3. Clear the freeze data with the HDS.
  4. Select the HISTORY DATA, and record the ON/OFF information for the following touch sensors: NOTE: When the freeze data is cleared, the information indicates "OFF". SW SMA UNLOCKDR SW SMA UNLOCKAS SW SMA LOCKDR SW SMA LOCKAS
  5. Turn the ignition switch OFF.
  6. Get out of the vehicle with the remote, and press the driver's or front passenger's door outer handle touch sensor.
  7. Check the ON/OFF information. Is ail the information changed from OFF to ON? YES - The system is OK at this time. NO - Go to step 8.
  8. Disconnect the faulty outer handle touch sensor 8P connector.
  9. Check for continuity between body ground and outer handle touch sensor 8P connector terminals No. 5 and No. 8 individually. Is there continuity? YES - Go to step 10. NO - Repair an open in the wire or poor ground (G601: driver's side, G506: passenger's side).
  10. Measure the voltage between outer handle touch sensor 8P connector terminal No. 1 and body ground. Is there battery voltage? YES - Go to step 11. NO - Blown No. 7 (10A) fuse in the driver's under-dash fuse/relay box. If the fuse is OK, check the wire between the touch sensor and the driver's under-dash fuse/relay box.
  11. Disconnect keyless access control unit connector A (31P) and connector B (24P).
  12. Connect the driver's (or front passenger's)* door outer handle touch sensor 8P connector No. 2 and No. 6 terminals to body ground with jumper wires.
  13. Check for continuity between keyless access control unit connector A (31P) terminals No. 19 and No. 20 and body ground (for front passenger's door touch sensor) or between keyless access control unit connector B (24P) terminals No. 22 and No. 23 and body ground (for driver's door touch sensor). Is there continuity? YES - Go to step 14. NO - Repair an open in the wire.
  14. Remove the jumper wires from the touch sensors.
  15. Check for continuity between keyless access control unit connector A (31P) terminals No. 19 and No. 20 and body ground (for front passenger's door touch sensor), or between keyless access control unit connector B (24P) terminals No. 22 and No. 23 and body ground (for driver's door touch sensor). Is there continuity? YES - Repair a short to ground in the wire. NO - Substitute a known-good touch sensor and recheck. If there is still a malfunction, replace the keyless access control unit.

Door and Trunk LF Antenna Test

Note. Before testing, check for DTCs. If any DTCs are indicated, troubleshoot the indicated DTCs first.

Scheme 79

Scheme 79: Door and Trunk LF Antenna Test
Scheme 79: Door and Trunk LF Antenna Test
  1. Connect the HDS to the data link connector (DLC).
  2. Turn the ignition switch ON (II) with the built-in key.
  3. Select the KEYLESS ACCESS from the SYSTEM SELECT menu with the HDS.
  4. Select the SELF CHECK and if any malfunction is found, troubleshoot it first.
  5. Select the FUNCTION TEST, and do the antenna driving test by checking the transmitting areas (A) between the LF antenna and the remote. LF ANTENNA CHART LF Antenna Location HDS Indication (Function Test) Driver's door LF antenna Driver Antenna Driving Front passenger's door LF antenna Front Passenger Antenna Driving Rear bumper LF antenna Trunk/Tailgate Driver Antenna Driving NOTE: Function Test cannot operate at the same time, check the LF antennas one at a time. Test the transmitting area at about 35.4 in. (90 cm) height from the ground. The LED will blink when the remote is within the shaded areas.

Interior LF Antenna Test

Note. Before testing, check for DTCs. If any DTCs are indicated, troubleshoot the indicated DTCs first.

Scheme 80

Scheme 80: Interior LF Antenna Test
Scheme 80: Interior LF Antenna Test
  1. Connect the HDS to the data link connector (DLC).
  2. Turn the ignition switch ON (II) with the built-in key.
  3. Select the KEYLESS ACCESS from the SYSTEM SELECT menu with the HDS.
  4. Select the SELF CHECK and if any malfunction is found, troubleshoot it first.
  5. Select the FUNCTION TEST, and do the antenna driving test by checking the transmitting area (A) between the LF antenna and the remote (except on the dashboard, in the glove box, door pockets, console box, and other enclosed areas). LF ANTENNA CHART LF Antenna Location HDS Indication (Function Test) Front Interior LF antenna Front Interior Antenna Driving Rear Interior LF antenna Rear Interior Antenna Driving Trunk interior/Rear shelf LF antenna Trunk interior/Rear shelf LF Antenna Driving NOTE: Function Test cannot operate at the same time, check the LF antennas one at a time.

Control Unit Input Test

Note. Before testing, troubleshoot the multiplex integrated control system first using B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).

Scheme 81

Scheme 81: Control Unit Input Test
Scheme 81: Control Unit Input Test
  1. Turn the ignition switch OFF.
  2. Remove the driver's dashboard undercover (see «DRIVER'S DASHBOARD UNDERCOVER REMOVAL/INSTALLATION»(/acura/rl/ii-2004-2008/remont/exteriorinterior-trim/#dashboard) ), and the driver's dashboard lower cover (see «DRIVER'S DASHBOARD LOWER COVER REMOVAL/INSTALLATION»(/acura/rl/ii-2004-2008/remont/exteriorinterior-trim/#dashboard) ).
  3. Disconnect the connectors (A) from the keyless access control unit (B). NOTE: All connector views are wire side of female terminals. A
  4. Inspect the connector and socket terminals to be sure they are all making good contact. If the terminals are bent, loose or corroded, repair them as necessary and recheck the system. If the terminals look OK, go to step 5.
  5. With the connectors still disconnected, make these input tests at the connectors. If any test indicates a problem, find and correct the cause, then recheck the system. If all the input tests prove OK, go to step 6. WIRE CAVITY CHART Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained A5 RED Ignition switch ON (ID Attach to ground: The immobilizer indicator should come on. Faulty gauge control module An open in the wire A31 GRN Ignition switch ON (II) Attach to ground: The keyless access indicator should come on. Faulty gauge control module An open in the wire
  6. Reconnect the connectors to the keyless access control unit, and make these input tests at the connectors. If any test indicates a problem, find and correct the cause, then recheck the system. If all the input tests prove OK, the control unit must be faulty; replace it. WIRE CAVITY CHART Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained A9 BLK Under all conditions Measure the voltage to ground: There should be less than 0.5 V. Poor ground (G501) An open in the wire A21 BLK Under all conditions Measure the voltage to ground: There should be less than 0.5 V. Poor ground (G501) An open in the wire A1 YEL Ignition switch ON (II) Measure the voltage to ground: There should be battery voltage. Blown No. 19(20 A) fuse in the driver's under-dash fuse/relay box An open in the wire A2 PUR Ignition switch ACC (I) Measure the voltage to ground: There should be battery voltage. Blown No. 32 (10 A) fuse in the driver's under-dash fuse/relay box An open in the wire A10 WHT Under all conditions Measure the voltage to ground: There should be battery voltage. Blown No. 6 (7.5 A) fuse in the driver's under-dash fuse/relay box Blown No. 15 (40 A) fuse in the under-hood fuse/relay box An open in the wire A22 WHT Under all conditions Measure the voltage to ground: There should be battery voltage. Blown No. 15(40 A) fuse in the under-hood fuse/relay box Blown No. 7 (10 A) fuse in the driver's under-dash fuse/relay box An open in the wire A14 ORN Parking brake pedal pressed Measure the voltage to ground: There should be less than 1 V. Faulty parking brake switch An open in the wire Parking brake pedal released Measure the voltage to ground: There should be 5 V or more. Faulty parking brake switch A short to ground in the wire B1 LT BLU Trunk lid outer handle switch pulled Measure the voltage to ground: There should be less than 1 V. Poor ground (G701) Faulty trunk lid outer handle switch An open in the wire Trunk lid outer handle switch released Measure the voltage to ground: There should be 5 V or more. Faulty trunk lid outer handle switch A short to ground in the wire

Scheme 82

Scheme 82: RF Unit 1 Replacement
Scheme 82: RF Unit 1 Replacement
  1. Remove the navigation display unit (see «NAVIGATION DISPLAY UNIT REMOVAL/INSTALLATION»(/acura/rl/ii-2004-2008/remont/navigation-system/#navigation-system) ).
  2. Disconnect the 6P connector (A) from RF unit 1 (B).
  3. Remove the bolt and RF unit 1.
  4. Install the unit in the reverse order of removal.

Scheme 83

Scheme 83: RF Unit 2 Replacement
Scheme 83: RF Unit 2 Replacement
  1. Remove the rear shelf (see «TRIM REMOVAL/INSTALLATION - REAR SHELF AREA»(/acura/rl/ii-2004-2008/remont/exteriorinterior-trim/#interior-trim__trim-removalinstallation-rear-shelf-area) ).
  2. Disconnect the 6P connector (A) from RF unit 2 (B).
  3. Remove the nut and RF unit 2.
  4. Install the unit in the reverse order of removal.

Scheme 84

Scheme 84: Front Interior LF Antenna Replacement
Scheme 84: Front Interior LF Antenna Replacement
  1. Remove the audio unit (see «AUDIO UNIT REMOVAL/INSTALLATION»(/acura/rl/ii-2004-2008/remont/entertainment-systems/#audio-system__audio-unit-removalinstallation) ).
  2. Remove the two bolts from the front interior LF antenna (A).
  3. Disconnect the 2P connector (B) from the front interior LF antenna.
  4. Install the antenna in the reverse order of removal.

Scheme 85

Scheme 85: Rear Interior LF Antenna Replacement
Scheme 85: Rear Interior LF Antenna Replacement
  1. Remove the center console rear cover (see «CENTER CONSOLE REMOVAL/INSTALLATION»(/acura/rl/ii-2004-2008/remont/exteriorinterior-trim/#consoles__center-console-removalinstallation) ).
  2. Disconnect the 2P connector (A) from the rear interior LF antenna (B).
  3. Remove the two screws and the rear interior LF antenna.
  4. Install the antenna in the reverse order of removal.

Scheme 86

Scheme 86: Rear Shelf LF Antenna Replacement
Scheme 86: Rear Shelf LF Antenna Replacement
  1. Remove the rear shelf (see «TRIM REMOVAL/INSTALLATION - REAR SHELF AREA»(/acura/rl/ii-2004-2008/remont/exteriorinterior-trim/#interior-trim__trim-removalinstallation-rear-shelf-area) ).
  2. Remove the rear shelf under cover (see «TRIM REMOVAL/INSTALLATION - REAR SHELF AREA»(/acura/rl/ii-2004-2008/remont/exteriorinterior-trim/#interior-trim__trim-removalinstallation-rear-shelf-area) ).
  3. Disconnect the 2P connector (A) from the rear shelf LF antenna (B).
  4. Remove the two bolts and the rear shelf LF antenna.
  5. Install the antenna in the reverse order of removal.

Scheme 87

Scheme 87: Rear Bumper LF Antenna Replacement
Scheme 87: Rear Bumper LF Antenna Replacement
  1. Remove the rear bumper (see «REAR BUMPER REMOVAL/INSTALLATION»(/acura/rl/ii-2004-2008/remont/exterior-body-panels/#bumpers__rear-bumper-removalinstallation) ).
  2. Disconnect the 2P connector (A) from the rear bumper LF antenna (B).
  3. Remove the two bolts and the rear bumper LF antenna.
  4. Install the antenna in the reverse order of removal.

Scheme 88

Scheme 88: Keyless Buzzer Replacement
Scheme 88: Keyless Buzzer Replacement
  1. Remove the rear bumper (see «REAR BUMPER REMOVAL/INSTALLATION»(/acura/rl/ii-2004-2008/remont/exterior-body-panels/#bumpers__rear-bumper-removalinstallation) ).
  2. Disconnect the 2P connector (A) from the keyless buzzer (B).
  3. Install the buzzer in the reverse order of removal.

Scheme 89

Scheme 89: Ignition Switch Knob Replacement
Scheme 89: Ignition Switch Knob Replacement
  1. Remove the ignition switch knob (A). Then remove the two screws (B) and lower knob portion from the ignition key cylinder.
  2. Replace the screws with new ones, and install the knob in the reverse order of removal.

Ignition Switch Control Unit Registration

  1. Turn the ignition switch ON (II).
  2. Connect the HDS to the data link connector.
  3. Select the KEYLESS ACCESS from the SYSTEM SELECT menu, then enter the REGISTRATION.
  4. Select the REPLACE IGNITION SWITCH CONTROL UNIT, and register the ignition switch control unit.
  5. Turn the ignition switch OFF, and verify the operation.

See also:
• DTC B1050: COMMUNICATION BUS LINE ERROR; DTC B1150: COMMUNICATION BUS LINE ERROR; DTC B1200: COMMUNICATION BUS LINE ERROR; DTC B1250: COMMUNICATION BUS LINE ERROR; DTC B1400: COMMUNICATION BUS LINE ERROR; DTC B1600: COMMUNICATION BUS LINE ERROR; DTC B1750: COMMUNICATION BUS LINE ERROR; DTC B1800: COMMUNICATION BUS LINE ERROR; DTC B2100: COMMUNICATION BUS LINE ERROR; DTC B2150: COMMUNICATION BUS LINE ERROR
• MICU INPUT TEST
• GAUGE CONTROL MODULE INPUT TEST
• DRIVER'S MPCS UNIT INPUT TEST
• TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A
• DRIVER'S DASHBOARD UNDERCOVER REMOVAL/INSTALLATION
• NAVIGATION DISPLAY UNIT REMOVAL/INSTALLATION
• TRIM REMOVAL/INSTALLATION - REAR SHELF AREA
• AUDIO UNIT REMOVAL/INSTALLATION
• CENTER CONSOLE REMOVAL/INSTALLATION
• REAR BUMPER REMOVAL/INSTALLATION
• B1601
• B1605
• B1610
• B1613
• B1626

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