Diagnostics
Thread Starter
Senior Member
Joined: May 2004
Posts: 468
Likes: 0
From: Richmond VA
C32
Diagnostics
I remember reading a thread a while back that told how you can access dignostics info through the HVAC control unit. Does anyone remember how to do it, or have a link to the original thread? I searched for it but could not find it.
Thanks in advance.
Thanks in advance.
Thread Starter
Senior Member
Joined: May 2004
Posts: 468
Likes: 0
From: Richmond VA
C32
Found it!
AC Diagnostic Mode
Press ”rest” for aprox 5 sec. Press then the left ”auto-button” a number of times to see the different channels. Mostly I use number 22, that is the speed.
01 In-car temperature sensor.
02 Outside temperature sensor.
03 Heater core temp, left.
04 Heater core temp, right.
05 Evaporator temperature sensor.
06 Engine coolant temperature.
07 Regrigerant pressure in bar (e.g. '4' is 4 bar).
08 Refrigerant temperature.
09 Not used.
10 Heater blower control voltage (normal 08-6.0, meaning .8 to 6 volts).
11 Emissions sensor voltage (to detect atmospheric gases and recirculate interior air).
12 Sun sensor voltage (to shift airflow in car).
20 Control current for auxilliary fan (electric fan on radiator, given in milliamps or mA).
21 Engine speed (x100).
22 Road speed (km/h or mph depending on installation).
23 Battery voltage at terminal 58d (as a percentage of total voltage, e.g. 99.0 = 99%).
24 Battery voltage (e.g. 12.8 = 12.8V).
40 Climate control software version.
41 Climate control hardware version.
AC Diagnostic Mode
Press ”rest” for aprox 5 sec. Press then the left ”auto-button” a number of times to see the different channels. Mostly I use number 22, that is the speed.
01 In-car temperature sensor.
02 Outside temperature sensor.
03 Heater core temp, left.
04 Heater core temp, right.
05 Evaporator temperature sensor.
06 Engine coolant temperature.
07 Regrigerant pressure in bar (e.g. '4' is 4 bar).
08 Refrigerant temperature.
09 Not used.
10 Heater blower control voltage (normal 08-6.0, meaning .8 to 6 volts).
11 Emissions sensor voltage (to detect atmospheric gases and recirculate interior air).
12 Sun sensor voltage (to shift airflow in car).
20 Control current for auxilliary fan (electric fan on radiator, given in milliamps or mA).
21 Engine speed (x100).
22 Road speed (km/h or mph depending on installation).
23 Battery voltage at terminal 58d (as a percentage of total voltage, e.g. 99.0 = 99%).
24 Battery voltage (e.g. 12.8 = 12.8V).
40 Climate control software version.
41 Climate control hardware version.
