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Tahoe / Yukon Service Manual

DTC B1A04 (K124 Image Proccessing Module)

Diagnostic Instructions Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach. Diagnostic Procedure Instructions provides an overview of each diagnostic category. DTC Descriptor DTC B1A04 Front View Camera - Windshield For symptom byte information, refer to Symptom Byte List. Circuit/System Description The K124 Image Processing Module continuously performs a signal compare between the B174W  Front View Camera – Windshield and B233B Forward Range Radar Sensor – Long Range. Conditions for Running the DTC Ignition ON. Conditions for Setting the DTC The B174W Front View Camera – Windshield signal does not match plausible values as determined by the K124 Image Processing Module. Action Taken When the DTC Sets Any systems that rely on data from the B174W Front View Camera – Windshield are disabled. A service message may be displayed on the driver information center. Conditions for Clearing the DTC A current DTC clears when the malfunction is no longer present. A history DTC clears when the control module ignition cycle counter reaches the reset threshold of 50, without a repeat of the malfunction. Reference Information Schematic Reference Driver Assistance Systems Schematics Connector End View Reference Master Electrical Component List Description and Operation Active Safety System Description and Operation Electrical Information Reference Circuit Testing Connector Repairs Testing for Intermittent Conditions and Poor Connections Wiring Repairs Scan Tool Reference Control Module References for scan tool information 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. ⇓ 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. ⇓ 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. ⇓ If DTC B1A04 is not set
  7. All OK. A fault is currently not present and may be an intermittent condition. Repair Instructions Perform the Diagnostic Repair Verification after completing the repair. Control Module References for control module replacement, programming, and setup.