Anti-Frost Thermostat

1 Plug in the Intelligent Saab Tester (ISAT) scan tool and select "READ FAULT CODES" from the menu. If any diagnostic trouble codes are present, continue in Trouble Code Tables.
2 With the engine running, select "ACT. OTHER FUNCT" from the ISAT scan tool menu and then "AC". The compressor should now be activated.
3 If it is not, check that a power supply of about 12 V is present on one of the- anti-frost thermometer's connector contacts.
If the voltage reading is OK, continue fault diagnosis as described in "Climate Control System, ACC".
4 If the voltage reading is not OK, connect a BOB and check the wiring for continuity/shorting between the Integrated Central Electronics (ICE) module and the anti-frost thermostat.


NOTE: The ISAT scan tool command should still be activated.


5 If the wiring is OK, continue on "Before Changing an Electronic Control Module".