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Diagnosis & Testing: Self-Diagnosis

  1. When a problem occurs in anti-lock brake system, warning light on instrument cluster comes on. To obtain satisfactory self-diagnostic results, always road test vehicle at least one minute at speed greater than 19 MPH (30 km/h).
  2. Stop vehicle, but keep engine running. On M30, locate ABS control unit in trunk (on rear shelf, next to speakers). See Figure . On G20 and Q45, ABS control unit is under right side of dash (behind glove box). See Figure or Figure . Count number of LED flashes during 5-10 second period, and go to appropriate SELF-DIAGNOSTICS CHART. See Figure or Figure . If more than 2 circuits malfunction at same time, LED will display only one malfunction. After circuit has been repaired, LED will then display any remaining system malfunctions.
  3. Turn ignition off after repairs. Road test vehicle to verify malfunction has been corrected. If ignition is not turned off, warning light and LED will continue to indicate problem exists even though malfunction has been repaired.
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