Honda HR-V: Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode 1 And Test Mode 2 (Without The HDS)

Shift to Test Mode 1

Check the PCM for DTCs and troubleshoot PCM or F-CAN loss of communication errors first, then do this diagnosis if the HDS is not available.

1. Check the No. B21 (10 A) fuse in the under-hood fuse/relay box and the No. C34 (7.5 A) fuse in the under-dash fuse/relay box. If a fuse is blown, find and correct the cause, then replace the fuse

2. Move the interior light switch to the DOOR position, and close all doors

NOTE : Do steps 3-7 within 10 seconds

3. Turn the vehicle to the ON mode

4. Pull and hold the combination light switch in its PASSING position.

5. While holding the combination light switch, turn to the PARKING position, then release, pull, and hold the combination switch in its PASSING position

6. Turn the combination light switch to OFF, then turn to the PARKING position, and turn the lights ON and OFF two more times

7. Release the combination light switch

8. Wait 5 seconds, and watch the front individual map lights and ceiling light. When the lights flash quickly once, the system enters in Test Mode 1

9. If front individual map lights keeps blinking after entering Test Mode 1. Check for B-CAN Unit communication error.

10. Check for B-CAN DTCs indicated by the display in the gauge control module while still in Test Mode 1.

Press the SEL/RESET button to display the next code. After you get to the last code, the display shows END. If no DTCs are stored, the display reads NO.

NOTE : If the test times out, turn the vehicle to the OFF (LOCK) mode, and repeat steps 3-7.

The control unit that has stored the code can be identified by the number shown after the letter DTC's code.

NOTE : You can also check B-CAN communication status by the following methods:

• The MICU self-diagnostic function Test Mode 1 and Test Mode 2 can check some communication statuses and some switch circuits.
• The gauge control module self-diagnostic function can check communication status.

11. Record all DTCs and sort them by DTC type, then troubleshoot them in this order:

• Internal error DTCs
• Loss of communication DTCs
• Signal error DTCs

12. Clear the DTCs by pressing and holding the SEL/RESET button for about 10 seconds

13. You will hear a beep to confirm the codes have been cleared. Operate the devices that failed, and recheck for codes.

Shift to Test Mode 2

NOTE : Do steps 14-17 within 10 seconds.

14. Pull and hold the combination light switch in its PASSING position.

15. While holding the combination light switch is in PASSING position, turn to the PARKING position, then release, pull, and hold the combination switch in its PASSING position

16. Turn the combination light switch to OFF, then turn to the PARKING position, and turn the lights ON and OFF two more times

17. Release the combination light switch

18. Wait 2 seconds, and watch the front individual map light. When the light flash two times quickly and then go off, the system is in Test Mode 2.

NOTE : If you repeat this procedure, the system automatically returns to Test Mode 1

19. The following tables list the circuits that can be checked in Test Mode 2. Operate the switch that is most closely related to the problem. If the circuit is OK, the front individual map light and ceiling light blink once. If the circuit is faulty, there is no such indication.

• If the front individual map light and ceiling light do not blink even when a switch is operated, check two or three other circuits listed in the table. If the front individual map light and ceiling light blink for each circuit, the additional circuits are OK; repair the short or open circuit that failed the test in step 18.
• If the front individual map light and ceiling light do not blink again, this means that the control unit has failed without triggering a DTC. Test a few more circuits. If they also fail, check the related control units using their input tests.

MICU

*: A second key is necessary to check the key cylinder inputs. Be sure to rotate the key cylinder switch two times to each position (lock and lock, unlock and unlock) to ensure the door lock knob switch is in the appropriate position.

*: A second key is necessary to check the key cylinder inputs. Be sure to rotate the key cylinder switch two times to each position (lock and lock, unlock and unlock) to ensure the door lock knob switch is in the appropriate position.

Gauge Control Module

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