DTC 2703: Aircon Diag

NOTE:

Check the vehicle battery condition first (see 12 VOLT BATTERY TEST ).
This navigation DTC sets when a communication error between the climate control unit and the audio-navigation unit (open or short) is detected.
Check for B-CAN DTCs and resolve them before troubleshooting.
Before you troubleshoot, make sure to follow the General Troubleshooting Information (see GENERAL TROUBLESHOOTING INFORMATION ).
DTC 2703 can be stored when the ignition switch is at ACCESSORY (I). When the ignition switch is in ACCESSORY (I), the climate control unit is turned off, the audio-navigation unit loses communication and stores navigation DTCs. Therefore, there is a possibility that the system is normal even though DTC 2703 is stored. Check System Links (see SYSTEM DIAGNOSTIC MODE ) with the engine running, and if it shows normal, the system is OK at this time. If not, do this troubleshooting.

Clear the hard error code (see HOW TO CLEAR ERROR HISTORY ).
Turn the ignition switch to LOCK 0), and then back to ON (II).
Go into the System Diagnostic Mode, and select the Self-Diagnosis Mode in the Select Diagnosis Items menu (see SYSTEM DIAGNOSTIC MODE ).
Check the System Links.
Is the A/C icon red?

YES -Go to step 5.

NO -Intermittent failure, the system is OK at this time.
Turn the ignition switch to LOCK (0).
Remove the audio-navigation unit (see AUDIO-NAVIGATION UNIT REMOVAL/INSTALLATION ).
NOTE:
- Eject all the discs before removing the audio-navigation unit to prevent damaging the CD player's load mechanism.
- Remove the PC card before removing the audio-navigation unit.
Disconnect audio-navigation unit connector D (12P).
Connect audio-navigation unit connector D (12P) terminals No. 1 and No. 2, and terminals No. 2 and No. 7 with jumper wires.

Fig 1: Connecting Audio-Navigation Unit Connector D (12P) Terminals No. 1, 2 And Terminals No. 2, 7 With Jumper Wires
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Turn the ignition switch to ON (II).
Press and hold the AUTO button, then press and hold the ON/OFF buttons.
Is the HEAT/VENT indicator solid with the remaining icons blinking?

YES -Replace the audio-navigation unit (see AUDIO-NAVIGATION UNIT REMOVAL/INSTALLATION ).

NO -Go to step 11.
Turn the ignition switch to LOCK (0), then disconnect the jumper wire.
Disconnect climate control unit 36P connector.
Connect climate control unit 36P connector terminals No. 8 and No. 9, and terminals No. 9 and No. 10 with jumper wires.

Fig 2: Connecting Climate Control Unit 36P Connector Terminals No. 8, 9, And Terminals No. 9, 10 With Jumper Wires
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Check for continuity between audio-navigation unit connector D (12P) terminals No. 1 and No. 2, and between terminals No. 2 and No. 7.

Fig 3: Checking Continuity Between Audio-Navigation Unit Connector D (12P) Terminals No. 1, 2 And Between Terminals No. 2, 7
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Go to step 15.

NO -Repair an open in the wire(s) between the audio-navigation unit and the climate control unit.
Disconnect the jumper wire.
Check for continuity between body ground and audio-navigation unit connector D (12P) terminals No. 1, No. 2, and No. 7 individually.

Fig 4: Checking Continuity Between Body Ground And Audio-Navigation Unit Connector D (12P) Terminals No. 1, 2 And 7
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Repair a short to body ground in the wire(s) between the audio-navigation unit and the climate control unit.

NO -Go to step 17.

Check for continuity between the audio-navigation unit connector D (12P) according to the table.

CONNECTOR TERMINAL REFERENCE CHART

From terminal (wire color)	To terminals (wire color)
D1 (YEL)	D2 (WHT), D7 (GRY)
D2 (WHT)	D7 (GRY)

Fig 5: Identifying Audio-Navigation Unit Connector D (12P)

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity between any of the terminals?

YES -Repair a short in the wire(s) between the audio-navigation unit and climate control unit.

NO -Go to step 18.

Turn the ignition switch to ON (II).
Measure the voltage between body ground and audio-navigation unit connector D (12P) terminals No. 1, No. 2, and No. 7 individually.

Fig 6: Measuring Voltage Between Body Ground And Audio-Navigation Unit Connector D (12P) Terminals No. 1, 2 And 7
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there less than 0.2 V?

YES -Replace the climate control unit (see CLIMATE CONTROL UNIT REMOVAL/INSTALLATION ).

NO -Repair a short to power in the wire(s) between the audio-navigation unit and the climate control unit.