Audio-HVAC subdisplay unit does not work properly

WARNING: This page is about a different car, the 2008 Acura TL and 2007 Acura TL. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

Check the vehicle battery condition first.
Make sure that the correct DVD color and version are installed.
Check any official Honda service web site for more service information about the navigation system.
Check and repair all CAN DTCs before doing this troubleshooting.

Turn the ignition switch to LOCK (0), and then back ON (II), then observe if the navigation system boots up with the Acura Globe Screen or the Honda Globe Screen.
Does the navigation system boot-up with the Acura Globe Screen?

YES -Go to step 2.

NO -The system displays the Honda Globe Screen. See the navigation system symptom troubleshooting index for The Honda Globe Screen appears every time the vehicle is started.
Operate the audio system.
Does the audio information display properly?

YES -Go to step 3.

NO -See the audio system symptom troubleshooting index for Audio system information does not display on the display panel or audio-HVAC subdisplay unit.
Operate the climate system.
Does the climate information display properly?

YES -Check the connections at the audio-HVAC subdisplay unit, display panel control unit, audio unit and climate control unit. Then recheck the function.

NO -Go to step 4.
Turn the ignition switch to LOCK (0).
Remove the audio-HVAC display module assembly (see AUDIO-HVAC DISPLAY MODULE ASSEMBLY REMOVAL/INSTALLATION ), and disconnect display panel control unit connector B (5P).
NOTE: Eject all the discs before removing the audio unit to prevent damaging the CD/DVD player's load mechanism.
Disconnect climate control unit connector A (20P).

Check for continuity between the display panel control unit connector B (5P) and body ground according to the table.

CONNECTOR TERMINAL REFERENCE CHART

Display panel control unit connector	Wire color
B5	WHT
B2	RED
B3	LT GRN
B4	BRN
B1	GRN

Fig 1: Identifying Display Panel Control Unit Connector B (6P)

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Repair short in the wire(s) between the display panel control unit and the climate control unit.

NO -Go to step 8.

Check for continuity between display panel control unit connector B (5P) and climate control unit connector A (20P) according to the table.

CONNECTOR TERMINAL REFERENCE CHART

Display panel control unit connector	Climate control unit connector	Wire color
B5	A11	WHT
B2	A13	RED
B3	A2	LT GRN
B4	A12	BRN
B1	A4	GRN

Fig 2: Identifying Display Panel Control Unit Connector A (20P)

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Substitute a known-good display panel control unit, then reconnect all of the connectors and recheck. If the symptom/indication goes away, replace the original display panel control unit. If the symptom/indication is still present, replace the climate control unit.

NO -Repair open in the wire(s) between the display panel control unit and climate control unit.