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A/C Compressor On Signal

  1. Enter READ MEASUREMENT BLOCK mode (display group 4). See the TESTS W/CODES article. In display field 4, observe first digit of 4-digit display value (switch inputs).
  2. Value should be zero. Disregard remaining digits. On vehicles with automatic A/C, press AUTO button, LO temperature button and HI blower button. On vehicles with manual A/C, press A/C button.
  3. On all vehicles, if "1" is not displayed as first digit of 4-digit display, go to next step. If "1" is displayed, press right arrow button. Input 06 for END DATA TRANSMISSION and acknowledge with "Q" button. Turn ignition off. Connect Test Box (VAG 1598) to PCM using Harness Adaptor (1598/11). See ELECTRICAL COMPONENT LOCATIONS  .
  4. Connect LED Tester (VAG 1527B) between test box terminals No. 11 and 45. Turn ignition on. Turn A/C on as in step 2). If LED comes on, replace PCM. If LED does not come on, check circuit between A/C-heater control panel and PCM. If circuit is okay, replace A/C-heater control panel.
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