Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Communication Circuit Test
2004 Acura TL AutomaticSECTION Communication Circuit Test
- Remove the upper panel (see DRIVER'S DASHBOARD UNDER COVER REMOVAL/INSTALLATION ).
- 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 ).
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.