DTC B1038

DTC B1038  : IMMOBILIZER F-CAN Authentication ID Not Received

NOTE: 

• If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A .
• If keyless access power control unit DTC U0073 is stored, troubleshoot DTC U0073 first.
• According to the detected DTC (s), check for the power circuit and the ground circuit of the control unit which cannot communicate with the body control module.
• Refer to the DTC shown on the display, then inspect the connectors and terminals based on the instructions.

DTC (Body Control Module)

1. CAN gateway system DTC check

   -1. Turn the vehicle to the ON mode.

   -2. Check for CAN gateway system DTCs with the HDS as follows.

   DTC Description	DTC

   Are any DTCs indicated?

   YES 

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

   NO 

   Go to step 2.

2. 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 Connection Check

   Does the body control module detect the CAN gateway Bus channel B?

   Bus B is Not Available

   Go to step 3.

   Bus B is Available

   Go to step 4.

3. Open wire check (F-CAN B_H line, F-CAN B_L line)

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

   -2. Disconnect the following connectors.

   CAN gateway 16P connector Body control module connector A (66P)

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

   Test condition	Vehicle OFF (LOCK) mode CAN gateway 16P connector: disconnected Body control module connector A (66P): disconnected
   Test point 1	CAN gateway 16P connector (female terminals) No. 6:
   Test point 2	Body control module connector A (66P) No. 64

   Test point 1	CAN gateway 16P connector (female terminals) No. 14:
   Test point 2	Body control module connector A (66P) No. 63

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

   Is there continuity?

   YES 

   The F-CAN B_H and F-CAN B_L wires are OK. Check for poor connections or loose terminals at the CAN gateway and the body control module. Substitute a known-good body control module , then recheck. If the DTC B1038 goes away after substitution, replace the original body control module .

   NO 

   Repair an open in F-CAN B_H or F-CAN B_L wire between the CAN gateway and the body control module.

4. 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 Connection Check

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

   DTC	Transmitting control unit	Detected CAN gateway Bus channels at normal
   B1038	VSA modulator-control unit	A, B

   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.

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

   Go to step 5.

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

   Go to step 6.

5. Open wire check (F-CAN A_H line, F-CAN A_L line)

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

   -2. According to the detected DTC on the following table, disconnect the CAN gateway and transmitting control unit connectors.

   DTC	Connector
   -	CAN gateway 16P connector
   B1038	VSA modulator-control unit 46P connector

   -3. Check for continuity between the receiving control unit and the transmitting control unit on the F-CAN A_H circuit and the F-CAN A_L circuit.

   Test condition

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

   DTC	Circuit name	Receiving control unit		Transmitting control unit
   		Connector	Terminal	Connector	Terminal
   B1038	F-CAN A_H	CAN gateway 16P connector (female terminals):	No. 3	VSA modulator-control unit 46P connector	No. 20
   	F-CAN A_L		No. 11		No. 21

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

   Is there continuity?

   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 control unit based on the instructions (see table).

   DTC	Operation for transmitting control unit
   B1038	Replace the VSA modulator-control unit .

   NO 

   Repair an open in F-CAN A_H or F-CAN A_L wire between the CAN gateway and the transmitting control unit.

6. Open wire check (F-CAN B_H line, F-CAN B_L line)

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

   -2. According to the detected DTC on the following table, disconnect the CAN gateway and transmitting control unit connectors.

   DTC	Connector
   -	CAN gateway 16P connector
   B1038	VSA modulator-control unit 46P connector

   -3. Check for continuity between the receiving control unit and the transmitting control unit on the F-CAN B_H circuit and the F-CAN B_L circuit.

   Test condition

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

   DTC	Circuit name	Receiving control unit		Transmitting control unit
   		Connector	Terminal	Connector	Terminal
   B1038	F-CAN B_H	CAN gateway 16P connector (female terminals):	No. 6	VSA modulator-control unit 46P connector	No. 24
   	F-CAN B_L		No. 14		No. 25

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

   Is there continuity?

   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 control unit based on the instructions (see table).

   DTC	Operation for transmitting control unit
   B1038	Replace the VSA modulator-control unit .

   NO 

   Repair an open in F-CAN B_H or F-CAN B_L wire between the CAN gateway and the transmitting control unit.