Technical information

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.
23	Sensor ground	Ground to sensors shorting to B+	B2945

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.