A/C-Heater Control Panel
WARNING: This page is about a different car, the 1996 Saab 900 and 1995 Saab 900. However, it is still accessible from the selected car via links, so may be relevant.
Checking pin voltage or resistance values at the A/C-heater control panel determines whether it is receiving and transmitting proper input/output signals. Measure values between pin numbers or battery terminals specified in A/C-HEATER CONTROL PANEL PIN VOLTAGE SPECIFICATIONS. Unless otherwise specified in table, ignition should be on. All values listed are approximate. See Fig 1
.
Courtesy of SAAB-SCANIA OF AMERICA, INC. A/C-HEATER CONTROL PANEL PIN VOLTAGE SPECIFICATIONS
| Component/Circuit (Pin No.) |
Test Condition (Across Terminals) |
Specification |
| Ground (1) |
(1-Battery Negative Terminal) |
Less Than 0.4 Volts |
| Front Recirculation Motor (2) |
Activate With ISAT (2-1) |
1-14 Volts On; 0 Volts Off |
| Parking Heater (3) |
Parking Heater Off/On (22-3/3-1) |
Battery Voltage |
| Voltage Supply (4) |
Ignition Off/On (4-Battery Positive Terminal) |
Less Than 0.5 Volt On; Battery VoltageOff |
| Air Blend Motor (8) |
Motor Stationary (8-1) |
1 Volt |
| SID + Bus (11) |
(11-1) |
2.5 Volts |
| SID - Bus (13) |
(13-1) |
2.5 Volts |
| Blend Air Sensor Gnd. (14) |
(14-1) |
Less Than 0.1 Volt |
| In-Vehicle Temp. Sensor Gnd. (15) |
(15-1) |
Less Than 0.1 Volt |
| In-Vehicle Temp. Sensor Fan (16) |
(16-1) |
Battery Voltage |
| Fan Control Unit Power (17) |
(17-1) |
Battery Voltage |
| Fan Control Voltage (20) |
No Fan/Full Fan (20-1) |
0 Volts No Fan/5 Volts Full Fan |
| Rear Recirculation Motor (21) |
Activate With ISAT (21-1) |
1-14 Volts On; 0 Volts Off |
| Voltage Supply (22) |
(22-Battery Positive Terminal) |
Less Than 0.5 Volt |
| Air Distribution Motor (23) |
Stationary Motor (23-1) |
1-14 Volts |
| Air Distribution Motor (24) |
Stationary Motor (24-1) |
1 Volt |
| Air Distribution Motor (25) |
Stationary Motor (25-1) |
1-14 Volts |
| Air Distribution Motor (26) |
Stationary Motor (26-1) |
1 Volt |
| Blend Air Motor (27) |
Stationary Motor (27-1) |
1-14 Volts |
| Blend Air Motor (28) |
Stationary Motor (28-1) |
1-14 Volts |
| Blend Air Motor (29) |
Stationary Motor (29-1) |
1 Volt |
| Rheostat (30) |
Full Brightness (30-1) |
Battery Voltage |
| Heated Rear Window (31) |
Off/On (31-1) |
0 Volts Off/ Battery Voltage On |
| Air Blend Sensor (32) |
At 73°F (23°C) (32-1) |
2.5 Volts |
| In-Vehicle Temp. Sensor (33) |
At 68°F (20°C) (33-1) |
2.7 Volts |
| Solar Sensor (34) |
Lit With Light Bulb (34-1) |
0-0.5 Volt |
| Solar Sensor Gnd. (35) |
(35-1) |
Less Than 0.1 Volt |
| Fan Test Voltage (37) |
No Fan/Full Fan (37-1) |
Battery VoltageNo Fan/0 Volts Full Fan |
| ICE (38) |
AUTO Mode/ECON Mode (38-1) |
Battery VoltageIn AUTO/0 VoltsIn ECON |
| Heated Rear Window (39) |
On/Off (Use Test Diode) |
Diode Flashes |