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Entering Self-Diagnostics

NOTE: Diagnosis should not be attempted unless all segments illuminate as it could lead to misdiagnosis. If any segment is inoperative, affected display panel should be replaced.
  1. Turn ignition on. Simultaneously depress OFF and WARMER buttons on Electronic Climate Control Panel (ECCP) and hold until all segments of Fuel Data Center (FDC) and ECCP glow. This indicates beginning of diagnostic readout. See Fig 1 and Fig 2 .
    Fig 1: Identifying Electronic Climate Control Panel (ECCP)
    G90A04574Courtesy of GENERAL MOTORS CORP.
    Fig 2: Identifying Fuel Data Center (FDC)
    G90D04575Courtesy of GENERAL MOTORS CORP.
  2. Segment check of FDC and ECCP ensures all display segments are working properly. If all segments glow, proceed to DISPLAYING TROUBLE CODES. Trouble codes are displayed on FDC.
  3. If any segment fails to glow, diagnosis should not be attempted as it could lead to inaccurate test results. An inoperative panel must be replaced before proceeding with self-diagnostic process.
    NOTE: Following completion of segment check, system automatically enters self-diagnostic mode.
  4. After all BCM and PCM codes have been displayed or if no codes are present, ".7.0" will be displayed and system is ready for next diagnostic feature to be selected. See DIAGNOSTIC TESTING.
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