Audio System DTC Troubleshooting: 2703
DTC 2703: Aircon Diag
NOTE:
Check the vehicle battery condition first.
This audio DTC sets when Connection NG is indicated in the Aircon diagnosis (the A/C icon is red in the System Links).
Check for B-CAN DTCs and resolve them before troubleshooting.
Before you troubleshoot, make sure to follow the General Troubleshooting Information.
1.
Problem verification:

Problem verification
?1.
Clear the hard error codes.

?2.
Turn the vehicle to the OFF (LOCK) mode then the ON mode.

?3.
Check for hard error codes.

Is DTC 2703 indicated?

     
YES
     
     
     
The failure is duplicated, go to step 2.
     
NO
     
     
     
Intermittent failure, the system is OK at this time.?
2.
Open wire check (B-CAN_H, B-CAN_L lines):

Open wire check (B-CAN_H, B-CAN_L lines)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the following connectors.
Audio unit connector B (20P)
Climate control unit 32P connector

?3.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
Climate control unit 32P connector: disconnected
 
Audio unit connector B (20P): disconnected
Test circuit 1
  
Test point 1
Audio unit connector B (20P) No. 3
Test point 2
Climate control unit 32P connector No. 30


Is there continuity?

     
YES
     
     
     
The B CAN-H wire and the B CAN-L wires are OK. Go to step 3.?
     
NO
     
     
     
Repair an open in the wire(s) between the audio unit and the climate control unit.?
3.
Climate control unit check (substitution):

Climate control unit check (substitution)
?1.
Substitute a known-good climate control unit.

?2.
Reconnect all the connectors.

?3.
Clear the hard error codes.

?4.
Turn the vehicle to the OFF (LOCK) mode then the ON mode.

?5.
Check for hard error codes.

Is DTC 2703 indicated?

     
YES
     
     
     
     
NO