How to retrieve fault codes:
If you wish to view the fault codes your ACC unit has stored, simply hold down the AUTO and OFF buttons on the ACC control panel.
The display will then display a single digit number on the left, and a double digit on the right.
i.e 1 ____ 21
This would signify 1 fault code stored, code 21.
Clicking on the tech 2 code will show a brief description of the fault, use browers back button to return.
| Fault Code | Defective function/component | Malfunction | Tech2 Code |
| 1 | Control module | Internal control module malfunction | B1605 |
| 2 | Cabin temperature sensor | Open circuit or short to B+ | B1350 |
| 2 | Cabin temperature sensor | Short-circuit to ground | B1350 |
| 3 | Solar sensor | Open circuit or communication error | B1340 |
| 4 | Mixed-air temperature sensor, LH | Open circuit or short to B+ | B1345 |
| 4 | Mixed-air temperature sensor, LH | Short-circuit to ground | B1345 |
| 5 | Mixed-air temperature sensor, RH | Short-circuit to ground | B2345 |
| 5 | Mixed-air temperature sensor, RH | Open circuit or short to B+ | B2345 |
| 6 | Stepping motor, air-mixing flap, LH | Open circuit, short to B+ or short to ground | B2490 |
| 7 | Stepping motor, air-mixing flap, LH | Jammed flap | B2496 |
| 8 | Stepping motor, air-mixing flap, RH | Loose flap | B2295 |
| 8 | Stepping motor, air-mixing flap, LH | Loose flap | B2495 |
| 9 | Stepping motor, air-mixing flap, RH | Open circuit | B2290 |
| 9 | Stepping motor, air-mixing flap, RH | Short-circuit to ground | B2290 |
| 10 | Stepping motor, air-mixing flap, RH | Jammed flap | B2296 |
| 12 | Stepping motor, air distribution flap | Open circuit | B2400 |
| 12 | Stepping motor, air distribution flap | Short-circuit to ground | B2400 |
| 13 | Stepping motor, air distribution flap | Jammed flap | B2406 |
| 14 | Stepping motor, air distribution flap | Loose flap | B2405 |
| 18 | Heat exchanger solenoid | Open circuit, short-circuit to ground | B2375 |
| 18 | Heat exchanger solenoid | Short-circuit to B+ | B2375 |
| 19 | Circulation pump | Open circuit, short-circuit to ground | B2380 |
| 19 | Circulation pump | Short-circuit to B+ | B2380 |
| 20 | Control voltage, fan | Short-circuit to B+ | B2425 |
| 20 | Control voltage, fan | Short-circuit to ground | B2425 |
| 21 | Direct current motor, air recirculation flap | B+ open circuit or shorted to ground | B2410 |
| 22 | This fault code means the ACC software is corrupt, this will require reflashing by a dealer using tech2 Most ACC systems will work normally with this code. |
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| 23 | Sensor ground | Ground to sensors shorting to B+ | B2945 |
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