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Home >> Cadillac >> 1991 >> Seville Base >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Headlights - Automatic Twilight Sentinel >> On-Vehicle Testing >> Body Control Module Test

Body Control Module Test

  1. Enter BCM diagnostics. See SELF DIAGNOSTICS article in ENGINE PERFORMANCE. Select BCM output test BO05. If BCM displays LO, headlights and exterior lights should come on. If the lights do not come on, refer to, in this article, TWILIGHT HEADLIGHT RELAY TEST  or or TWILIGHT PARK LIGHT RELAY  test.
  2. If BCM displays HI, headlights and exterior lights should be off. If lights are not off, go to TWILIGHT HEADLIGHT RELAY TEST  or TWILIGHT PARK LIGHT RELAY  test. If BCM display does not cycle from LO to HI, replace BCM.
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