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Tahoe / Yukon Service Manual

DTC C116C

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 C116C Front Brake Pad Wear Signal Circuit Symptom Byte Information: Symptom Byte List Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performanc
Signal C116C 65, 67 C116C 13 C116C 66 C116C 64, 86
Low Reference — C116C 13 — —

Circuit/System Description For an overview of the component/system, refer to: Brake Pad Life Monitoring Description and Operation

Circuit Description
Signal The control module input circuit has an internal resistance connected to 12 V.
Ground circuit Chassis Ground

Conditions for Running the DTC Ignition » On / Vehicle » In Service Mode Battery Voltage = Greater than 9 V & Less than 16 V Conditions for Setting the DTC C116C 13 Signal circuit = Open Ground circuit = Open C116C 66 k d l k d f Brake pads are excessively worn or improper Brake Pad Life Monitor reset Signal circuit = Short to Voltage C116C 65, 67 Brake pads have low pad wear or new pads have been installed without a Brake Pad Life Monitor reset Signal circuit = Short to Ground C116C 64, 86 The control module receives no or invalid data from a sensor. Actions Taken When the DTC Sets A message and/or warning indicator may be displayed to the driver. Conditions for Clearing the DTC A current DTC will clear when the diagnostic runs and passes. Diagnostic Aids Inspect for worn brake pads. After replacing brake pad wear sensor perform the Brake Pad Life Monitoring Reset. Reference Information Schematic Reference Disc Brake Schematics Connector End View Reference Master Electrical Component List 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. Verify no other DTCs are set. ⇒ If other DTCs are set Refer to: Diagnostic Trouble Code (DTC) List - Vehicle ⇓ If no other DTCs are set Refer to: Circuit/System Testing Circuit/System Testing
  1. Ignition/Vehicle & All vehicle systems » Off
  2. Disconnect the electrical connector: B172LF Front Disc Brake Pad Wear Sensor - Left
  3. Test for less than 10 Ω between the test points: Ground circuit terminal 2 & Ground ⇒ If 10 Ω or greater 3.1. Test for less than 2 Ω between the test points: Ground circuit terminal 2 @ Component harness & The other end of the circuit ⇒ If 2 Ω or greater » Repair the open/high resistance in the circuit. ⇒ If less than 2 Ω » Repair the open/high resistance in the ground connection. ⇓ If less than 10 Ω
  4. Ignition » On / Vehicle » In Service Mode
  5. Verify the scan tool parameter: Front Brake Pad Wear Sensors = Greater than 10.5 V ⇒ If not the specified state 5.1. Ignition/Vehicle » Off 5.2. Disconnect the electrical connector: K160 Brake System Control Module 5.3. Test for infinite resistance between the test points: Signal circuit terminal 1 @ Component harness & Ground ⇒ If less than infinite resistance » Repair the short to ground on the circuit. ⇒ If infinite resistance » Replace the component: K160 Brake System Control Module ⇓ If the specified state
  6. Connect a 3 A fused jumper wire between the test points: Signal circuit terminal 1 & Ground circuit terminal 2
  7. Verify the scan tool parameter: Front Brake Pad Wear Sensors = 0 V ⇒ If not the specified state 7.1. Ignition/Vehicle » Off & Remove » Jumper wire(s) 7.2. Disconnect the electrical connector: K160 Brake System Control Module 7.3. Ignition » On / Vehicle » In Service Mode 7.4. Test for less than 1 V between the test points: Signal circuit terminal 1 @ Component harness & Ground ⇒ If 1 V or greater » Repair the short to voltage on the circuit. ⇓ If less than 1 V 7.5. Ignition/Vehicle » Off 7.6. Test for less than 2 Ω between the test points: Signal circuit terminal 1 @ Component harness & Terminal X1 39 @ Control module harness ⇒ If 2 Ω or greater » Repair the open/high resistance in the circuit. ⇒ If less than 2 Ω » Replace the component: K160 Brake System Control Module ⇓ If the specified state
  8. Test or replace the component: B172LF Front Disc Brake Pad Wear Sensor - Left Repair Instructions Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification Front Disc Brake Pad Wear Sensor Replacement For control module replacement, programming, and setup refer to: Control Module References