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Tahoe / Yukon Service Manual

DTC B13AD

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 Descriptors DTC B13AD Lane Departure Warning Disable Switch Signal For symptom byte information, refer to Symptom Byte List. Diagnostic Fault Information

Circuit Number Circuit Function Short to Ground Open/High Resistance Short to Voltage Signal Performan
3153 Signal B13AD 11 1 — —
1851 Ground — 1 — —
1. Lane keep assist cannot be disabled using the lane keep assist switch

Scan Tool Data Lane Departure Warning Switch Status

Control Module Data List Values Normal Operation
K9 Body Control Module Indicator Data On/Off/Malfunction The parameter will be Off when the lane keep assist switch is released/open and On when the lane keep assist switch is pressed/closed.

Circuit/System Description The lane keep assist switch is part of the S86 Vehicle Stability Control System Switch. It is a normally open switch that closes when the switch is pressed. The K9 Body Control Module monitors the switch on signal circuit 3153 and the switch receives a constant ground on ground circuit 1851. When the lane keep assist switch is not pressed, the switch is open and signal voltage observed by the K9 Body Control Module is high. When the lane keep assist switch is pressed, the switch is closed and signal voltage observed by the K9 Body Control Module is low. Conditions for Running the DTC Ignition ON Conditions for Setting the DTC Circuit 3153 is shorted to ground The lane keep assist switch is stuck closed Action Taken When the DTC Sets No action is taken. Conditions for Clearing the DTC The condition for setting the DTC is no longer present. Diagnostic Aids Holding the lane keep assist switch for an extend period of time can cause DTC B13AD to set. Reference Information Schematic Reference Driver Assistance Systems Schematics Connector End View Reference Master Electrical Component List Description and Operation Lane Keep Assist 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. Ignition ON.
  2. Verify the scan tool Lane Departure Warning Switch Status parameter is Off. ⇒ If the parameter is not Off Refer to Circuit/System Testing. ⇓ If the parameter is Off
  3. Verify the scan tool Lane Departure Warning Switch Status parameter is On while pressing the lane keep assist switch. ⇒ If the parameter is not On Refer to Circuit/System Testing. ⇓ If the parameter is On
  4. All OK. A fault is currently not present and may be an intermittent condition. Circuit/System Testing
  5. Ignition OFF, disconnect the connector at the S86 Vehicle Stability Control System Switch.
  6. Verify a test lamp illuminates between ground circuit terminal 10 and B+ ⇒ If the test lamp does not illuminate Repair the open/high resistance on circuit 1851 or the ground connection. ⇓ If the test lamp illuminates
  7. Ignition ON.
  8. Verify the scan tool Lane Departure Warning Switch Status parameter is Off. ⇒ If the parameter is not Off 4.1. Test circuit 3153 for a short to ground. ⇒ If a short to ground is found, repair the fault on the circuit. ⇓ If a short to ground is not found 4.2. Replace the K9 Body Control Module. ⇓ If the parameter is Off
  9. Connect a 3 A fused jumper wire between signal circuit terminal 4 and ground.
  10. Verify the scan tool Lane Departure Warning Switch Status parameter is On. ⇒ If the parameter is not On 6.1. Test circuit 3153 for an open/high resistance. ⇒ If an open/high resistance is found, repair the fault on the circuit. ⇓ If a short to ground is not found 6.2. Replace the K9 Body Control Module. ⇓ If the parameter is On
  11. Replace the S86 Vehicle Stability Control System Switch. Repair Instructions Perform the Diagnostic Repair Verification after completing the repair. Driver Assistance Systems Component Replacement Reference Control Module References for control module replacement, programming, and setup.