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Home >> Volvo >> 2003 >> C70 2.3 53, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 40 (Ignition And Control Systems - General Diagnostics And Tests (Coupe)) >> Testing Air Conditioning (A/C) System Input/Output Signals (B5234T3; B5254T; 1998) >> Checking air conditioning (A/C) relay signal and air conditioning (A/C) compressor signal >> Checking air conditioning (A/C) relay and compressor signals >> Checking air conditioning (A/C) compressor signal cable

Checking air conditioning (A/C) compressor signal cable

WARNING: This page is about a different car, the 2002 Volvo C70, 2001 Volvo C70, 2000 Volvo C70, 1999 Volvo C70, and 1998 Volvo C70. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Engine Start Verification
GLL101037Courtesy of VOLVO CARS OF NORTH AMERICA.
Fig 2: Identifying A/C Switch OFF/ON
GLL118699Courtesy of VOLVO CARS OF NORTH AMERICA.

The voltmeter should read battery voltage when the compressor is running. 

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