LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Buick >> 2021 >> Envision Preferred, AWD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Collision/Avoidance >> Driver Assistance Systems >> Diagnostic Information and Procedures >> DTC B1A04 (K124 Image Processing Module) >> Circuit/System Verification
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Circuit/System Verification

  1. Verify the area in front of the B174W Front View Camera - Windshield is clean, unobstructed, and damage-free.
    • If not clean, unobstructed, and damage-free 

      Clear or repair as necessary.

    • Go to next step: If clean, unobstructed, and damage-free 
  2. Verify the B174W Front View Camera - Windshield is properly mounted and secured with no damage.
    • If not properly mounted and secured or damage is present 

      Repair or replace components as necessary.

    • Go to next step: If properly mounted and secured and no damage is present 
  3. Ignition ON.
  4. Clear DTCs.
  5. Driver the vehicle for 3 - 5 minutes at speeds greater than 9 km/h (6 mph) in normal traffic conditions.
  6. Verify the DTC B1A04 does not set.
    • If DTC B1A04 is set 

      Replace the B174W Front View Camera - Windshield.

    • Go to next step: If DTC B1A04 is not set 
  7. All OK. A fault is currently not present and may be an intermittent condition.
scientia non olet · About LEMON Manuals