AWD System Symptom Troubleshooting - HDS does not communicate (AWD, With Multipurpose Camera Unit) (2019 2020 2021)

HDS does not communicate 

1. HDS communication check

   -1. Turn the vehicle to the ON mode.

   -2. Check that the HDS communicates with the vehicle.

   Does the HDS communicate with the vehicle?

   YES 

   The HDS communication is OK. Go to step 2.

   NO 

   Go to the DLC circuit troubleshooting .

2. AWD with intelligent control system communication check

   -1. Check the Main Menu of the AWD WITH INTELLIGENT CONTROL with the HDS.

   Does the HDS show the Main Menu of the AWD WITH INTELLIGENT CONTROL?

   YES 

   The AWD with intelligent control system communication is OK. Intermittent failure, the system is OK at this time.

   NO 

   Go to step 3.

3. Fuse check

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

   -2. Check the following fuses.

   Fuse	No. C39
   	No. D5

   Is the fuse OK?

   YES 

   The fuse is OK. Reinstall the fuse, then go to step 4.

   NO 

   Replace the fuse (s). If the fuse (s) blows again, repair a short to ground in the No. C39 and/or the No. D5 fuse circuit, then recheck.

4. 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

   Are any DTCs indicated?

   YES 

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

   NO 

   Go to step 5.

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

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

   F-CAN Bus Connected Unit Check

   Which result is indicated?

   AWD CONTROL UNIT is Detected

   Check for any authorized service information related to the DTCs or symptoms you are troubleshooting or substitute a known-good AWD control unit , then recheck. If this DTC goes away and the AWD control unit was substituted, replace the original AWD control unit .

   AWD CONTROL UNIT is Not Available

   Go to step 6.

6. Rear differential fluid pressure sensor check

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

   -2. Disconnect the following connector.

   Rear differential fluid pressure sensor 3P connector

   -3. Turn the vehicle to the ON mode.

   -4. Check the Main Menu of the AWD WITH INTELLIGENT CONTROL with the HDS.

   Does the HDS show the Main Menu of the AWD WITH INTELLIGENT CONTROL?

   YES 

   Replace the rear differential fluid pressure sensor .

   NO 

   The rear differential fluid pressure sensor is OK. Go to step 7.

7. Open wire check (IG1 OPTION line)

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

   -2. Disconnect the following connector.

   AWD control unit 24P connector

   -3. Start the engine.

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

   Test condition	Vehicle ON mode (idling)
   	Rear differential fluid pressure sensor 3P connector: disconnected
   	AWD control unit 24P connector: disconnected
   Test point 1	AWD control unit 24P connector No. 12
   Test point 2	Body ground

   Is there battery voltage?

   YES 

   The IG1 OPTION wire is OK. Go to step 8.

   NO 

   Repair an open in the IG1 OPTION wire between the AWD control unit and the No. C39 fuse.

8. Open wire check (+B E-DPS line)

   -1. Measure the voltage between test points 1 and 2.

   Test condition	Vehicle ON mode (idling)
   	Rear differential fluid pressure sensor 3P connector: disconnected
   	AWD control unit 24P connector: disconnected
   Test point 1	AWD control unit 24P connector No. 2
   Test point 2	Body ground

   Is there battery voltage?

   YES 

   The +B E-DPS wire is OK. Go to step 9.

   NO 

   Repair an open in the +B E-DPS wire between the AWD control unit and the No. D5 fuse.

9. Open wire check (GND line)

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

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

   Test condition	Vehicle OFF (LOCK) mode
   	Rear differential fluid pressure sensor 3P connector: disconnected
   	AWD control unit 24P connector: disconnected
   Test point 1	AWD control unit 24P connector No. 8
   Test point 2	Body ground

   Is there continuity?

   YES 

   The GND wire is OK. Go to step 10.

   NO 

   Repair an open in the GND wire between the AWD control unit and ground (G505).

10. Shorted wire check (SVCC line)

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

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

    Test condition	Vehicle OFF (LOCK) mode
    	Rear differential fluid pressure sensor 3P connector: disconnected
    	AWD control unit 24P connector: disconnected
    Test point 1	AWD control unit 24P connector No. 20
    Test point 2	Body ground

    Is there continuity?

    YES 

    Repair a short to ground in the SVCC wire between the AWD control unit and the rear differential fluid pressure sensor.

    NO 

    The SVCC wire is OK. Go to step 11.

11. 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 connector.

    CAN gateway 16P connector

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

    F-CAN B_H 

    Test condition	Vehicle OFF (LOCK) mode
    	Rear differential fluid pressure sensor 3P connector: disconnected
    	AWD control unit 24P connector: disconnected
    	CAN gateway 16P connector: disconnected
    Test point 1	AWD control unit 24P connector No. 14
    Test point 2	CAN gateway 16P connector (female terminals) No. 6:

    F-CAN B_L 

    Test condition	Vehicle OFF (LOCK) mode
    	Rear differential fluid pressure sensor 3P connector: disconnected
    	AWD control unit 24P connector: disconnected
    	CAN gateway 16P connector: disconnected
    Test point 1	AWD control unit 24P connector No. 24
    Test point 2	CAN gateway 16P connector (female terminals) No. 14:

    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. Go to step 12.

    NO 

    Repair an open in the F-CAN B_H and/or F-CAN B_L wires between the AWD control unit and the CAN gateway.

12. Open wire check (DIAG-CAN_H line, DIAG-CAN_L line)

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

    DIAG-CAN_H 

    Test condition	Vehicle OFF (LOCK) mode
    	Rear differential fluid pressure sensor 3P connector: disconnected
    	AWD control unit 24P connector: disconnected
    	CAN gateway 16P connector: disconnected
    Test point 1	CAN gateway 16P connector (female terminals) No. 2:
    Test point 2	DLC (16P) (female terminals) No. 6:

    DIAG-CAN_L 

    Test condition	Vehicle OFF (LOCK) mode
    	Rear differential fluid pressure sensor 3P connector: disconnected
    	AWD control unit 24P connector: disconnected
    	CAN gateway 16P connector: disconnected
    Test point 1	CAN gateway 16P connector (female terminals) No. 10:
    Test point 2	DLC (16P) (female terminals) No. 14:

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

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

    Is there continuity?

    YES 

    The DIAG-CAN_H wire and the DIAG-CAN_L wire are OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting or substitute a known-good AWD control unit , then recheck. If this DTC goes away and the AWD control unit was substituted, replace the original AWD control unit .

    NO 

    Repair an open in the DIAG-CAN_H and/or DIAG-CAN_L wires between the CAN gateway and the DLC.