DTC B1038 (With CAN Gateway)

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 .
• Before you troubleshoot, review the general troubleshooting information .
• 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.

   DTC Description	DTC
   U0029-00 CAN Gateway F-CAN ch A Bus Off
   U3000-49 CAN Gateway Internal Failure

   Is DTC U0029-00 and/or U3000-49 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 channels A?

   Bus A is Not Available

   Go to step 3.

   Bus A is Available

   Go to step  4.

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

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

   -2. Disconnect the following connectors.

   CAN gateway 16P connector Body control module connector B (36P)

   -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 B (36P): disconnected
   Test point 1	CAN gateway 16P connector (female terminals) No. 3:
   Test point 2	Body control module connector B (36P) No. 22

   Test point 1	CAN gateway 16P connector (female terminals) No. 11:
   Test point 2	Body control module connector B (36P) No. 23

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

   Is there continuity?

   YES 

   The F-CAN A H and F-CAN A 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 and the body control module was substituted, replace the original body control module .

   NO 

   Repair an open in F-CAN A H or F-CAN A 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

   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.

5. Open wire check (F-CAN A 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 connectors.

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

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

   Test condition

   Vehicle OFF (LOCK) mode CAN gateway 16P connector: disconnected Transmitting control unit connector for indicated DTCs: 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. Refer to the DTC shown on the display, replace the control unit based on the instructions (see chart below).

   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.