900 SE Convertible V6-2498cc 2.5L DOHC (1995)
Air Conditioning Switch: Diagnostic Aids
General Information
Testing Methods - General
Suitable instruments for diagnosing faults in the car's electrical system are an Intelligent Saab Tester (ISAT) Scan Tool, a voltmeter and an ohmmeter.
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Use an ISAT Scan Tool or voltmeter for measuring the voltage in a circuit.
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If the voltmeter is of analogue type, it should have an internal resistance of at least 20 Megohm/V.
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Use an ISAT Scan Tool or ohmmeter for measuring the resistance of a circuit.
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The ohmmeter must NOT be used for taking readings on components containing semiconductors, such as control modules and time-delay relays,
etc.
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When measuring resistance, the voltage supply to the system being tested must be disconnected as the test instrument feeds a small current into the
circuit being tested.
This will ensure that no current is already flowing through the circuit and that a correct reading will be obtained.
Checking the Voltage
