Display Panel Control System — Acura TL III (2003-2006)

Scheme 49

Scheme 49: Component Location Index

Resetting the Display Panel

The procedure should be done to reset the display panel control unit if the HDS is unable to clear DTCs.

Press and hold the rear window defogger button, the recirculation button, and passenger's temperature control up (hot) buttons.
Turn the ignition switch to the ACC (I) position while continuing to hold the buttons.
Hold the buttons for 6 seconds, then release.

Note. With navigation: If the radio is on, the audio-HVAC subdisplay unit will flash as the display panel is being reset. The clock will reset to 1:00. Without navigation: If the radio is on, the display panel control unit screen will flash as the display panel is being reset.

Self-diagnostic Function

The display panel control unit has a self-diagnostic function that covers the back light and LCD check, button light check and button operation check.

Entering the Self-diagnostic Function

Press and hold the driver's "AUTO" button and "DUAL" button.
Turn the ignition switch ACC (I), then release the buttons.

HVAC Button Check

Press any climate control button and the corresponding segment or LED will turn on to ensure LCD driver functionally and as button confirmation.

Back Light, LCD, Switch Light Check

Turn the combination light switch ON.

Turn on the LCD back light.
Turn on all LCD segments.
Brings screen to full bright (with navigation).
A beep sound is heard when pressing any climate control button (with navigation).

If the display panel control unit fails to complete any of the functions of the self-diagnostic function, go to the display panel control unit input test (see DISPLAY AND CONTROL UNIT INPUT TEST ).

Communication Circuit Test

Remove the upper panel (see «DRIVER'S DASHBOARD UNDER COVER REMOVAL/INSTALLATION»(/acura/tl/iii-2003-2006/remont/exteriorinterior-trim/#dashboard) ).
Disconnect the display panel control unit connector B (6P) and connect the special tool (07AAZ-SEPA100) to display panel control unit.
Push and hold the driver's "AUTO" button for 5 seconds.
The driver's temperature and passenger's temperature indicators will display a code. Check the code in the list below. If the code is considered OK, then the center panel module's communication circuit is OK. If the code is considered a fault, replace the center panel module. TEMPERATURE INDICATOR CODES Temp Indicator Code Code Description Communication circuit is: Possible problems: 00 00 Communication check normal OK Communication circuit in the climate control unit is faulty Short or open in the communication circuit between the climate control unit and the display panel control unit 00 01 Over-run error Faulty The display panel control unit is faulty 00 02 Framing error Faulty The display panel control unit is faulty 00 04 Parity error Faulty The display panel control unit is faulty 00 08 Timeout for 1st byte Faulty The display panel control unit is faulty 00 10 Timeout between data characters Faulty The display panel control unit is faulty 00 20 Other fault in communication 1 Faulty The display panel control unit is faulty 00 40 Other fault in communication 2 Faulty The display panel control unit is faulty 00 80 Timeout between data characters Faulty The display panel control unit is faulty FF FF Difference between sent data and received data Faulty The display panel control unit is faulty If the display module control unit fails to complete any of the functions of the self-diagnostic function, go to the display module control unit input test (see «DISPLAY AND CONTROL UNIT INPUT TEST»(/acura/tl/iii-2003-2006/remont/gauges-instrument-panels/#display-panel-control-system__display-and-control-unit-input-test) ).

Exiting the Self-diagnostic Function

Press and hold the passenger's "AUTO" button for 3 seconds.
Turn the ignition switch OFF.

Display Panel Control Unit Inputs and Outputs

When replacing a display panel control unit connector, match the wires to the cavities listed in the following table.

With Navigation

Scheme 50

Scheme 50: Display Panel Control Unit Inputs and Outputs

Without Navigation

Scheme 51

Note. For the display panel control unit connectors B, C, and D, refer to the Circuit Diagram of Climate Control (see CIRCUIT DIAGRAM ), and for the display panel control unit connector E, refer to the System Description of Navigation System (see SYSTEM DESCRIPTION ).

Cavity	Wire	Connects to	Input/Output
A1	BLK	Ground (G501)
A2	RED	Dash lights brightness controller (bulb)	Input
A3	BLU	BUS(+)	Input
A4	RED/BLK	Lights-on signal	Input
A5	YEL/RED	ACC (Main stereo power supply)	Input
A6	WHT/RED	Constant power	Input
A7	RED/BLU	Dash lights brightness controller (LED)	Input
A8	BLU/WHT	Audio unit (IMS 1)	Output
A9	GRN/ORN	Audio unit (IMS 0)	Output
A10	WHT	Shield GND
A11	RED	BUS(-)	Output
A12		Not used
A13		Not used
A14	LT BLU	Multiplex integrated control unit	Input/Output

DISPLAY PANEL CONTROL UNIT INPUT OUTPUT TEST

Scheme 52

Scheme 52: Circuit Diagram

Scheme 53

DTC Troubleshooting

DTC	Description
DTC B1701	Display Panel Control Unit CPU Error
DTC B1702	Display Panel Control Unit EEPROM Error
DTC B1705	Display Panel Control Unit Lost Communication with the Gauge Control Module (Engine Temperature Signal)
DTC B1706	Display Panel Control Unit Lost Communication with the Gauge Control Module (VSS/NE Signal)
DTC B1725	Display Panel Control Unit Temperature is too high

DTC INDEX

DTC B1701: Display Panel Control Unit CPU Error

Note. Display panel control unit DTCs may not clear using the HDS. If the DTCs will not clear, manually reset the display panel control unit (see GENERAL TROUBLESHOOTING INFORMATION ). If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN system diagnosis test mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).

Clear the DTCs with the HDS.
Turn the ignition switch OFF, and then back ON (II).
Check for DTCs with the HDS. Is DTC B1701 indicated? YES- Replace the display panel control unit. NO- Intermittent failure, the system is OK at this time.

DTC B1702: Display Panel Control Unit EEPROM Error

Clear the DTCs with the HDS.
Turn the ignition switch OFF, and then back ON (II).
Check for DTCs with the HDS. Is DTC B1702 indicated? YES- Replace the display panel control unit. NO- Intermittent failure, the system is OK at this time.

DTC B1705: Display Panel Control Unit Lost Communication with the Gauge Control Module (Engine Temperature Signal)

Clear the DTC with the HDS.
Turn the ignition switch OFF, and then back ON (II).
Check for DTCs with the HDS. Are DTCs B1008, B1011, B1060, B1061, B1805, and B1808 indicated? YES- Go to the Gauge Control Module Input Test (see «GAUGE CONTROL MODULE INPUT TEST»(/acura/tl/iii-2003-2006/remont/communication-devices/#multiplex-intergrated-control-system) ). NO- Replace the display panel control unit.

DTC B1706: Display Panel Control Unit Lost Communication with the Gauge Control Module (VSS/NE Signal)

Clear the DTC with the HDS.
Turn the ignition switch OFF, and then back ON (II).
Check for DTCs with the HDS. Are DTCs B1011, B1060, and B1805 indicated? YES- Go to the Gauge Control Module Input Test (see «GAUGE CONTROL MODULE INPUT TEST»(/acura/tl/iii-2003-2006/remont/communication-devices/#multiplex-intergrated-control-system) ). NO- Replace the display panel control unit.

DTC B1725: Display Panel Control Unit Temperature is too high

Clear the DTC with the HDS.
Turn the ignition switch OFF, and then back ON (II).
Park the vehicle avoiding the direct sunlight and cool down the in-car temperature.
Check for DTCs with the HDS. Is DTC B1725 indicated? YES- Replace the center panel control unit. NO- Intermittent failure, the system is OK at this time.

Display and Control Unit Input Test

Note. Before troubleshooting, do the B-CAN system test mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ) and the display panel control unit self-diagnostic function test (see GENERAL TROUBLESHOOTING INFORMATION ).

Scheme 54

Scheme 54: Display and Control Unit Input Test

Remove the audio-HVAC display module assembly (see «AUDIO-HVAC DISPLAY MODULE ASSEMBLY REMOVAL/INSTALLATION»(/acura/tl/iii-2003-2006/remont/gauges-instrument-panels/#display-panel-control-system__audio-hvac-display-module-assembly-removalinstallation) ).
Inspect the connector and socket terminals to be sure they are all making good contact. If the terminals are bent, loose or corroded, repair them as necessary, and recheck the system. If the terminals look OK, go to step 3.
Reconnect the connector, and make these input tests at the connector. If any test indicates a problem, find and correct the cause, then recheck the system. If all the input tests prove OK, go to step 4. DISPLAY AND CONTROL UNIT INPUT TEST Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained A1 BLK Under all conditions Check for voltage to ground: There should be less than 1 V. Poor ground (G501) An open in the wire A5 YEL/RED Ignition switch ACC(I) Check for voltage to ground: There should be battery voltage. Blown No. 32 (7.5A) fuse in the under-dash fuse/relay box An open in the wire A6 WHT/RED Under all conditions Check for voltage to ground: There should be battery voltage. Blown No. 7 (7.5 A) fuse in the under-dash fuse/relay box An open in the wire A4 RED/BLK Combination light switch ON Check for voltage to ground: There should be battery voltage. Faulty interior light circuit An open in the wire
Disconnect the 14P connector from the control unit, and make these input tests at the connector. If any test indicates a problem, find and correct the cause, then recheck the system. If all the input tests prove OK, go to navigation system (see «SYSTEM DESCRIPTION»(/acura/tl/iii-2003-2006/remont/navigation-system/#navigation-system) ) and climate control (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system) ). If the navigation system and climate control system are OK, replace the display panel control unit. DISPLAY AND CONTROL UNIT INPUT TEST Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained A2 RED Under all conditions Check for continuity between the A2 terminal and gauge control module B9 terminal: There should be continuity. An open in the wire A7 RED/BLU Under all conditions Check for continuity between the A7 terminal and gauge control module B8 terminal: There should be continuity. An open in the wire A3 BLU Under all conditions Check for continuity between the A3 terminal and audio unit C13 terminal: There should be continuity. An open in the wire A8 BLU/WHT Under all conditions Check for continuity between the A8 terminal and audio unit C9 terminal: There should be continuity. An open in the wire A9 GRN/ORN Under all conditions Check for continuity between the A9 terminal and audio unit C8 terminal: There should be continuity. An open in the wire A10 WHT Under all conditions Check for continuity to ground: There should be continuity. An open in the wire A11 RED Under all conditions Check for continuity between the A11 terminal and audio unit C26 terminal: There should be continuity. An open in the wire

Audio-HVAC Display Module Assembly Removal/Installation

SRS components are located in this area. Review the SRS component locations (see COMPONENT LOCATION INDEX ), and the precautions and procedures (see PRECAUTIONS AND PROCEDURES ) before performing repairs or service.

Note. Put on gloves to protect your hands. Take care not to scratch the dashboard and related parts. Lay a workshop towel under the parts when working on them to protect the face panel from scratches or other damage.

Scheme 55

Scheme 55: Audio-HVAC Display Module Assembly Removal/Installation

Make sure you have the anti-theft codes for the radio and navigation system, then write down the channels for the XM radio's presets.
Remove the center console rear section (see «CENTER CONSOLE REAR SECTION REMOVAL/INSTALLATION»(/acura/tl/iii-2003-2006/remont/gauges-instrument-panels/#consoles__center-console-rear-section-removalinstallation) ) and center console panel (see «CENTER CONSOLE PANEL REMOVAL/ INSTALLATION»(/acura/tl/iii-2003-2006/remont/gauges-instrument-panels/#consoles__center-console-panel-removal-installation) ).
Remove the upper panel (see «DRIVER'S DASHBOARD UNDER COVER REMOVAL/INSTALLATION»(/acura/tl/iii-2003-2006/remont/exteriorinterior-trim/#dashboard) ).
Remove the screws and bolts, then pull out the audio-HVAC display module assembly (A).
Disconnect the connectors (B) and antenna sublead (C), then remove the audio-HVAC display module assembly.
Install the audio-HVAC display module assembly in the reverse order of removal, and note these items: Make sure all connectors and antenna lead are secure. Enter the anti-theft code for the radio, then enter the customer's XM radio channel presets, and set the clock. If necessary, enter the navigation system anti-theft code.

Scheme 56

Scheme 56: Display Panel Control Unit Removal/Installation

Remove the audio-HVAC display module assembly (see «AUDIO-HVAC DISPLAY MODULE ASSEMBLY REMOVAL/INSTALLATION»(/acura/tl/iii-2003-2006/remont/gauges-instrument-panels/#display-panel-control-system__audio-hvac-display-module-assembly-removalinstallation) ).
Remove the screws and bolts, then separate the audio unit (A) and display panel control unit (B). NOTE: To avoid the damage, remove the screws (C) first, then remove the bolts (D).
Install the audio unit to the display panel control unit in the reverse order of removal.

Display Panel Control System Acura TL III