Left Door Open Message

BCM supplies and monitors voltage on circuit 3C12. If voltage is sensed as being low (door ajar), BCM will display LEFT DOOR OPEN message under the following conditions:

• PRNDD21 is okay (no Code B127 set)
• Engine is running
• Transmission not in Park or Neutral
• Left door ajar switch input is low

Or if the following conditions exist:

• LEFT DOOR OPEN message already set
• Left door ajar switch input is low

Fig 1: Left Door Open Message Circuit Diagram

Fig 2: Left Door Open Message Flow Chart