DTC U0100-00, U0101-00, U0122-00, U0128-00, U0129-00, U0155-00 (Acoustic Vehicle Alerting Control Unit)

DTC U0100-00  : Acoustic vehicle alerting control unit lost communication with PCM

DTC U0101-00  : Acoustic vehicle alerting control unit lost communication with PCM/TCM

DTC U0122-00  : Acoustic vehicle alerting control unit lost communication with VSA modulator-control unit

DTC U0128-00  : Acoustic vehicle alerting control unit lost communication with Electric parking brake control unit

DTC U0129-00  : Acoustic vehicle alerting control unit lost communication with Electric servo brake control unit

DTC U0155-00  : Acoustic vehicle alerting control unit lost communication with Gauge control module

NOTE: 

• If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A .
• Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information .
• 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 or the power source failure at the transmitting control unit (the grounding inspection and the power source inspection on each control unit are required prior to this checking process).

DTC (Acoustic Vehicle Alerting Control Unit)

1. Problem verification

   -1. Clear the DTCs with the HDS.

   -2. Turn the vehicle to the OFF (LOCK) mode and then the ON mode.

   -3. Wait for at least 6 seconds.

   -4. Check for DTCs with the HDS.

   DTC Description	Confirmed DTC	Pending DTC
   U0100-00 Acoustic vehicle alerting control unit lost communication with PCM
   U0101-00 Acoustic vehicle alerting control unit lost communication with PCM/TCM
   U0122-00 Acoustic vehicle alerting control unit lost communication with VSA modulator-control unit
   U0128-00 Acoustic vehicle alerting control unit lost communication with Electric parking brake control unit
   U0129-00 Acoustic vehicle alerting control unit lost communication with Electric servo brake control unit
   U0155-00 Acoustic vehicle alerting control unit lost communication with Gauge control module

   Are any DTCs indicated?

   YES 

   Go to step 2.

   NO 

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

2. CAN gateway system DTC check

   -1. Check for CAN gateway system DTCs with the HDS.

   DTC Description	DTC
   U0029-00 CAN Gateway F-CAN ch A Bus Off
   U0047-00 CAN Gateway F-CAN ch B Bus Off
   U0056-00 CAN Gateway F-CAN ch C Bus Off
   U0065-00 CAN Gateway F-CAN ch D Bus Off
   U0038-00 CAN Gateway F-CAN ch E Bus Off
   U3000-49 CAN Gateway Internal Failure

   Is DTC U0029-00, U0047-00, U0056-00, U0038-00, and/or U3000-49 indicated?

   YES 

   Go to the troubleshooting for CAN gateway system DTC(s) .

   NO 

   Go to step 3.

3. F-CAN circuit communication check

   -1. Select the FUNCTION TEST in the CAN gateway with the HDS, then select the F-CAN Bus Connected Unit Check.

   F-CAN Bus Connected Unit Check

   Does the acoustic vehicle alerting control unit detect the CAN gateway Bus channels B?

   Bus B is Not Available

   Go to step 4.

   Bus B is Available

   Go to step 5.

4. Open wire check (F-CAN B lines)

   -1. Turn the vehicle to the OFF (LOCK) mode.

   -2. Disconnect the following connectors.

   CAN gateway 16P connector

   Acoustic vehicle alerting control unit 12P connector

   -3. Measure the resistance between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode CAN gateway 16P connector: disconnected Acoustic vehicle alerting control unit 12P connector: disconnected
   Test point 1	CAN gateway 16P connector (female terminals) No. 6:
   Test point 2	Acoustic vehicle alerting control unit 12P connector No. 5

   Test point 1	CAN gateway 16P connector (female terminals) No. 14:
   Test point 2	Acoustic vehicle alerting control unit 12P connector No. 6

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

   Is there 1.0 Ω or less?

   YES 

   The F-CAN B_H and F-CAN B_L wires are OK. Replace the acoustic vehicle alerting control unit .

   NO 

   Repair an open in F-CAN B_H or F-CAN B_L wire.

5. F-CAN circuit communication check (Transmitting control unit)

   -1. Select the FUNCTION TEST in the CAN gateway with the HDS, then select the F-CAN Bus Connected Unit Check.

   F-CAN Bus Connected Unit Check

   According to the detected DTC on the following table, make sure that the transmitting control unit detects the CAN gateway Bus channel(s) normally.

   DTC	Transmitting control unit	Detected CAN gateway Bus channel(s) at normal
   U0100-00	PCM	A, B, E
   U0101-00	PCM	A, B, E
   U0122-00	VSA modulator-control unit	B, C
   U0128-00	VSA modulator-control unit	B, C
   U0129-00	Electric servo brake control unit	B, C
   U0155-00	Gauge control module	D

   Is it detected normally?

   Detected normal

   Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the transmitting control unit and the CAN gateway.

   U0100-00: PCM is Not Available for Bus A

   Go to step 6.

   U0100-00: PCM is Not Available for Bus B

   Go to step 7.

   U0100-00: PCM is Not Available for Bus E

   Go to step 10.

   U0101-00: PCM is Not Available for Bus A

   Go to step 6.

   U0101-00: PCM is Not Available for Bus B

   Go to step 7.

   U0101-00: PCM is Not Available for Bus E

   Go to step 10.

   U0122-00: VSA modulator-control unit is Not Available for Bus B

   Go to step 7.

   U0122-00: VSA modulator-control unit is Not Available for Bus C

   Go to step 8.

   U0128-00: VSA modulator-control unit is Not Available for Bus B

   Go to step 7.

   U0128-00: VSA modulator-control unit is Not Available for Bus C

   Go to step 8.

   U0129-00: Electric servo brake control unit is Not Available for Bus B

   Go to step 7.

   U0129-00: Electric servo brake control unit is Not Available for Bus C

   Go to step 8.

   U0155-00: Gauge control module is Not Available for Bus D

   Go to step 9.

6. Open wire check (F-CAN A lines)

   -1. Turn the vehicle to the OFF (LOCK) mode.

   -2. U0100-00, U0101-00: Jump the SCS line with the HDS, and wait more than 1 minute.

   SCS short

   -3. According to the detected DTC on the following table, disconnect the transmitting control unit connector(s).

   DTC	Connector
   -	CAN gateway 16P connector
   U0100-00	PCM connector A (50P)
   U0101-00	PCM connector A (50P)

   -4. Measure the resistance between test points 1 and 2.

   Test condition

   Vehicle OFF (LOCK) mode CAN gateway 16P connector: disconnected Transmitting control unit connector(s) for indicated DTCs: disconnected

   DTC	Circuit name	Test point 1 (Receiving control unit)		Test point 2 (Transmitting control unit)
   		Connector	Terminal	Connector	Terminal
   U0100-00	F-CAN A_H	CAN gateway 16P connector (female terminals):	No. 3	PCM connector A (50P)	No. 37
   	F-CAN A_L		No. 11		No. 36
   U0101-00	F-CAN A_H	CAN gateway 16P connector (female terminals):	No. 3	PCM connector A (50P)	No. 37
   	F-CAN A_L		No. 11		No. 36

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

   Is there 1.0 Ω or less?

   YES 

   The F-CAN A_H wire and the F-CAN A_L wire are OK.

   According to the detected DTC on the following table replace the correspond control unit.

   DTC	Operation for transmitting control unit
   U0100-00	PCM
   U0101-00	PCM

   NO 

   Repair an open in F-CAN A_H or F-CAN A_L wire.

7. Open wire check (F-CAN B lines)

   -1. Turn the vehicle to the OFF (LOCK) mode.

   -2. U0100-00, U0101-00: Jump the SCS line with the HDS, and wait more than 1 minute.

   SCS short

   -3. According to the detected DTC on the following table, disconnect the transmitting control unit connector(s).

   DTC	Connector
   -	CAN gateway 16P connector
   U0100-00	PCM connector A (50P)
   U0101-00	PCM connector A (50P)
   U0122-00	VSA modulator-control unit 46P connector
   U0128-00	VSA modulator-control unit 46P connector
   U0129-00	Electric servo brake control unit 22P connector
   U0155-00	Gauge control module connector A (32P)

   -4. Measure the resistance between test points 1 and 2.

   Test condition

   Vehicle OFF (LOCK) mode CAN gateway 16P connector: disconnected Transmitting control unit connector(s) for indicated DTCs: disconnected

   DTC	Circuit name	Test point 1 (Receiving control unit)		Test point 2 (Transmitting control unit)
   		Connector	Terminal	Connector	Terminal
   U0100-00	F-CAN B_H	CAN gateway 16P connector (female terminals):	No. 6	PCM connector A (50P)	No. 39
   	F-CAN B_L		No. 14		No. 38
   U0101-00	F-CAN B_H	CAN gateway 16P connector (female terminals):	No. 6	PCM connector A (50P)	No. 39
   	F-CAN B_L		No. 14		No. 38
   U0122-00	F-CAN B_H	CAN gateway 16P connector (female terminals):	No. 6	VSA modulator-control unit 46P connector	No. 40
   	F-CAN B_L		No. 14		No. 28

   DTC	Circuit name	Test point 1 (Receiving control unit)		Test point 2 (Transmitting control unit)
   		Connector	Terminal	Connector	Terminal
   U0128-00	F-CAN B_H	CAN gateway 16P connector (female terminals):	No. 6	VSA modulator-control unit 46P connector	No. 40
   	F-CAN B_L		No. 14		No. 28
   U0129-00	F-CAN B_H	CAN gateway 16P connector (female terminals):	No. 6	Electric servo brake control unit 22P connector	No. 15
   	F-CAN B_L		No. 14		No. 14
   U0155-00	F-CAN B_H	CAN gateway 16P connector (female terminals):	No. 6	Gauge control module connector A (32P)	No. 5
   	F-CAN B_L		No. 14		No. 6

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

   Is there 1.0 Ω or less?

   YES 

   The F-CAN B_H wire and the F-CAN B_L wire are OK.

   According to the detected DTC on the following table replace the correspond control unit.

   DTC	Operation for transmitting control unit
   U0100-00	PCM
   U0101-00	PCM
   U0122-00	VSA modulator-control unit
   U0128-00	VSA modulator-control unit
   U0129-00	Electric servo brake control unit
   U0155-00	Gauge control module

   NO 

   Repair an open in F-CAN B_H or F-CAN B_L wire.

8. Open wire check (F-CAN C lines)

   -1. Turn the vehicle to the OFF (LOCK) mode.

   -2. According to the detected DTC on the following table, disconnect the transmitting control unit connector(s).

   DTC	Connector
   -	CAN gateway 16P connector
   U0122-00	VSA modulator-control unit 46P connector
   U0128-00	VSA modulator-control unit 46P connector
   U0129-00	Electric servo brake control unit 22P connector

   -3. Measure the resistance between test points 1 and 2.

   Test condition

   Vehicle OFF (LOCK) mode CAN gateway 16P connector: disconnected Transmitting control unit connector(s) for indicated DTCs: disconnected

   DTC	Circuit name	Test point 1 (Receiving control unit)		Test point 2 (Transmitting control unit)
   		Connector	Terminal	Connector	Terminal
   U0122-00	F-CAN C_H	CAN gateway 16P connector (female terminals):	No. 5	VSA modulator-control unit 46P connector	No. 46
   	F-CAN C_L		No. 13		No. 34

   DTC	Circuit name	Test point 1 (Receiving control unit)		Test point 2 (Transmitting control unit)
   		Connector	Terminal	Connector	Terminal
   U0128-00	F-CAN C_H	CAN gateway 16P connector (female terminals):	No. 5	VSA modulator-control unit 46P connector	No. 46
   	F-CAN C_L		No. 13		No. 34
   U0129-00	F-CAN C_H	CAN gateway 16P connector (female terminals):	No. 5	Electric servo brake control unit 22P connector	No. 19
   	F-CAN C_L		No. 13		No. 18

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

   Is there 1.0 Ω or less?

   YES 

   The F-CAN C_H wire and the F-CAN C_L wire are OK.

   According to the detected DTC on the following table replace the correspond control unit.

   DTC	Operation for transmitting control unit
   U0122-00	VSA modulator-control unit
   U0128-00	VSA modulator-control unit
   U0129-00	Electric servo brake control unit

   NO 

   Repair an open in F-CAN C_H or F-CAN C_L wire.

9. Open wire check (F-CAN D lines)

   -1. Turn the vehicle to the OFF (LOCK) mode.

   -2. According to the detected DTC on the following table, disconnect the transmitting control unit connector(s).

   DTC	Connector
   -	CAN gateway 16P connector
   U0155-00	Gauge control module connector A (32P)

   -3. Measure the resistance between test points 1 and 2.

   Test condition

   Vehicle OFF (LOCK) mode CAN gateway 16P connector: disconnected Transmitting control unit connector(s) for indicated DTCs: disconnected

   DTC	Circuit name	Test point 1 (Receiving control unit)		Test point 2 (Transmitting control unit)
   		Connector	Terminal	Connector	Terminal
   U0155-00	F-CAN D_H	CAN gateway 16P connector (female terminals):	No. 7	Gauge control module connector A (32P)	No. 19
   	F-CAN D_L		No. 15		No. 20

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

   Is there 1.0 Ω or less?

   YES 

   The F-CAN D_H wire and the F-CAN D_L wire are OK.

   According to the detected DTC on the following table replace the correspond control unit.

   DTC	Operation for transmitting control unit
   U0155-00	Gauge control module

   NO 

   Repair an open in F-CAN D_H or F-CAN D_L wire.

10. Open wire check (EP-CAN lines)

    -1. Turn the vehicle to the OFF (LOCK) mode.

    -2. U0100-00, U0101-00: Jump the SCS line with the HDS, and wait more than 1 minute.

    SCS short

    -3. According to the detected DTC on the following table, disconnect the transmitting control unit connector(s).

    DTC	Connector
    -	CAN gateway 16P connector
    U0100-00	PCM connector A (50P)
    U0101-00	PCM connector A (50P)

    -4. Measure the resistance between test points 1 and 2.

    Test condition

    Vehicle OFF (LOCK) mode CAN gateway 16P connector: disconnected Transmitting control unit connector(s) for indicated DTCs: disconnected

    DTC	Circuit name	Test point 1 (Receiving control unit)		Test point 2 (Transmitting control unit)
    		Connector	Terminal	Connector	Terminal
    U0100-00	EP-CAN A_H	CAN gateway 16P connector (female terminals):	No. 16	PCM connector A (50P)	No. 21
    	EP-CAN A_L		No. 8		No. 20
    U0101-00	EP-CAN A_H	CAN gateway 16P connector (female terminals):	No. 16	PCM connector A (50P)	No. 21
    	EP-CAN A_L		No. 8		No. 20

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

    Is there 1.0 Ω or less?

    YES 

    The EP-CAN A_H wire and the EP-CAN A_L wire are OK.

    According to the detected DTC on the following table replace the correspond control unit.

    DTC	Operation for transmitting control unit
    U0100-00	PCM
    U0101-00	PCM

    NO 

    Repair an open in EP-CAN A_H or EP-CAN A_L wire.