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.

DTC (Body Control Module)

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. Check for DTCs with the HDS.

   DTC Description	DTC
   B1038 IMMOBILIZER F-CAN Authentication ID Not Received

   Is DTC B1038 indicated?

   YES 

   Go to step 2.

   NO 

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

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. Gauge control module DTC check

   -1. Check for gauge control module DTCs with the HDS.

   DTC Description	DTC
   U0122 Gauge control module lost communication with VSA modulator-control unit

   Is DTC U0122 indicated?

   YES 

   Go to gauge control module DTC U0122 troubleshooting .

   NO 

   Go to step 4.

4. 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 body control module detect the CAN gateway Bus channels B?

   Bus B is Not Available

   Go to step 5.

   Bus B is Available

   Go to step 6.

5. 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. Measure the resistance between test points 1 and 2.

   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. 6:
   Test point 2	Body control module connector B (36P) No. 22

   Test point 1	CAN gateway 16P connector (female terminals) No. 14:
   Test point 2	Body control module connector B (36P) No. 23

   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 body control module .

   NO 

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

6. 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 channels normally.

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

   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.

   B1038: VSA modulator-control unit is Not Available for Bus B

   Go to step 7.

   B1038: VSA modulator-control unit is Not Available for Bus C

   Go to step 8.

7. Open wire check (F-CAN B 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. Measure the resistance 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	Test point 1 (Receiving control unit)		Test point 2 (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. 40
   	F-CAN B_L		No. 14		No. 28

   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. Refer to the DTC shown on the display, replace the control unit based on the instructions (see table).

   DTC	Operation for transmitting control unit
   B1038	VSA modulator-control unit

   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 connectors.

   DTC	Connector
   -	CAN gateway 16P connector
   B1038	VSA modulator-control unit 46P 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 for indicated DTCs: disconnected

   DTC	Circuit name	Test point 1 (Receiving control unit)		Test point 2 (Transmitting control unit)
   		Connector	Terminal	Connector	Terminal
   B1038	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

   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. Refer to the DTC shown on the display, replace the control unit based on the instructions (see table).

   DTC	Operation for transmitting control unit
   B1038	VSA modulator-control unit

   NO 

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