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Tahoe / Yukon Service Manual

DTC B182C

Diagnostic Instructions Perform the Diagnostic System Check prior to using this diagnostic procedure: Diagnostic System Check - Vehicle Review the description of Strategy Based Diagnosis: Strategy Based Diagnosis An overview of each diagnostic category can be found here: Diagnostic Procedure Instructions DTC Descriptor DTC B182C Fuel Fill Door Lock/Unlock 1 Signal Symptom Byte Information: Symptom Byte List Diagnostic Fault Information

Circuit number Circuit Function Short to Ground Open/High Resistance Short to Voltage Signal Performan
2679 Control 2, 3 B171C 12, B171C 13 — —
2689 Control 1 B182C 12, B182C 13 — —
1. Fuel tank filler door lock actuator Lock and Unlock function inoperative 2. Driver door Lock and Unlock function inoperative 3. Left rear door Lock and Unlock function inoperative

Circuit/System Description The K9 Body Control Module provides the control circuit 1091, control circuit 1094, control circuit  2679, control circuit 2680, control circuit 2681, control circuit 2682 and control circuit 2689 with voltage and ground to the appropriate lock and unlock control circuits of the door latches. The lock and unlock control circuits of the fuel filler door lock actuator, left rear and driver door latches are connected together. Transitioning of the lock actuators to the lock or unlocked position depends upon which control circuits receive voltage and which control circuits receive ground. Conditions for Running the DTC M97 Fuel Tank Filler Door Lock Actuator — When the component is commanded to Unlock Conditions for Setting the DTC B182C 12, B182C 13 2689= Short to Voltage or Open/High Resistance Actions Taken When the DTC Sets M97 Fuel Tank Filler Door Lock Actuator = Inoperative Conditions for Clearing the DTC g A current DTC will clear when the diagnostic runs and passes. A history DTC will clear after 40 consecutive malfunction-free ignition cycles. Reference Information Schematic Reference Release Systems Schematics Connector End View Reference Master Electrical Component List Description and Operation Fuel Fill Door 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 Circuit/System Verification

  1. Ignition » On / Vehicle » In Service Mode
  2. Operate the component: S13D Door Lock Switch - Driver » Lock Switch Verify the component works as specified: M97 Fuel Tank Filler Door Lock Actuator = Locked ⇒ If not the specified state Refer to: Circuit/System Testing ⇓ If the specified state
  3. Operate the component: S13D Door Lock Switch - Driver » Unlock Switch Verify the component works as specified: M97 Fuel Tank Filler Door Lock Actuator = Unlocked ⇒ If not the specified state Refer to: Circuit/System Testing ⇓ If the specified state
  4. A fault is not currently present and may be an intermittent condition Circuit/System Testing
  5. Ignition/Vehicle » Off
  6. Disconnect the electrical connector: M97 Fuel Tank Filler Door Lock Actuator
  7. Connect a test lamp between the test points: Control circuit terminal 1 & Control circuit terminal 2
  8. Ignition » On / Vehicle » In Service Mode
  9. Operate the component: S13D Door Lock Switch - Driver » Lock Switch & Unlock Switch Verify the test lamp state: S13D Door Lock Switch - Driver » Not Pressed = Test lamp Off Lock Switch » Pressed = Test lamp On Unlock Switch » Pressed = Test lamp On ⇒ If the test lamp is always OFF 5.1. Ignition OFF, remove the test lamp, disconnect the harness connector at the K9 Body Control Module 5.2. Test for infinite resistance between the control circuit listed below and ground: control 2679 control 2689 ⇒ If less than infinite resistance, repair the short to ground on the circuit. ⇓ If infinite resistance 5.3. Test for less than 2 Ω in the control circuit listed below end to end: control 2679 control 2689 ⇒ If 2 Ω or greater, repair the open/high resistance in the circuit. ⇒ If less than 2 Ω, refer to: Power Door Locks Malfunction ⇒ If the test lamp is always ON 5.1. Ignition OFF, remove the test lamp, disconnect the harness connector at the K9 Body Control Module, ignition ON. 5.2. Test for less than 1 V between the control circuit listed below and ground: control 2679 control 2689 ⇒ If 1 V or greater, repair the short to voltage on the circuit. ⇒ If less than 1 V, refer to: Power Door Locks Malfunction ⇓ If the test lamp turns ON and OFF
  10. Test or replace the component: M97 Fuel Tank Filler Door Lock Actuator Component Testing
  11. Ignition/Vehicle » Off
  12. Disconnect the electrical connector: M97 Fuel Tank Filler Door Lock Actuator
  13. Connect a 20 A fused jumper wire between the test points: Control terminal 1 & 12 V
  1. Momentarily connect a jumper wire between the test points: Control terminal 2 & Ground Reverse the jumper wires 2 times between the terminals. Verify the component works as specified: M97 Fuel Tank Filler Door Lock Actuator = Lock / Unlock ⇒ If not the specified state Replace the component: M97 Fuel Tank Filler Door Lock Actuator ⇓ If the specified state
  2. All OK. Repair Instructions Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification Fuel Tank Filler Pipe Housing Replacement For control module replacement, programming, and setup refer to: Control Module References