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Tahoe / Yukon Service Manual

DTC C060B

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 C060B Left Park Brake Motor Apply Control Symptom Byte Information: Symptom Byte List Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performanc
Control — Terminal 2 @ K160 Brake System Control Module C060B 00 C060B 13 C060B 16 C060B 00 C060B 13 C060B 16 C060B 17 C060B 49 C060B 92
Control — Terminal 3 @ K160 Brake System Control Module C060B 00 C060B 13 C060B 16 C060B 00 C060B 13 C060B 16 C060B 17 C060B 49 C060B 92

Circuit/System Description For an overview of the component/system, refer to: Electronic Parking Brake Description

Circuit Description
Control — Terminal 2 The output circuit is switched from ground to 12 V to activate the component.
Control — Terminal 3 The output circuit is switched from ground to 12 V to activate the component.
Component Description
M104L Parking Brake Actuator - Left The park brake function uses the same brake pads as the operational brake in the rear calipers. An electric motor in each caliper is used to apply and release the brake pads.
Component Description
K160 Brake System Control Module The control module K160 can increase and decrease the brake pressure on all 4 wheels individually in order to fulfill these functions: Antilock Braking Traction Control Vehicle Stability Control

Conditions for Running the DTC Ignition = On System Voltage = 9 to 16 V Conditions for Setting the DTC M104L Parking Brake Actuator - Left = Malfunction Left Park Brake Actuator Circuit = Malfunction Actions Taken When the DTC Sets Parking Brake Actuator = Disabled A message and/or warning indicator may be displayed to the driver. Conditions for Clearing the DTC The conditions for setting the DTC no longer exist. A history DTC will clear after 40 consecutive malfunction-free ignition cycles. Diagnostic Aids The park brake is disabled as long as the DTC is set. It might be necessary to clear the DTC with a scan tool after repairing the fault to make the park brake work again. Reference Information Schematic Reference Park Brake System 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

  1. Ignition » On / Vehicle » In Service Mode
  2. Operate the component: S91 Parking Brake Control Switch Verify the scan tool parameter: Left Park Brake Actuator Status = Applied ⇒ If not the specified state Refer to: Circuit/System Testing ⇓ If the specified state
  3. Operate the component: S91 Parking Brake Control Switch Verify the scan tool parameter: Left Park Brake Actuator Status = Released ⇒ If not the specified state Refer to: Circuit/System Testing ⇓ If the specified state
  4. All OK. Circuit/System Testing
  1. Ignition/Vehicle » Off
  2. Disconnect the electrical connector: M104L Parking Brake Actuator - Left & K160 Brake System Control Module
  3. Ignition » On / Vehicle » In Service Mode
  4. Test for less than 1 V between the test points: Terminal 2 @ K160 Brake System Control Module Harness Connector & Ground Terminal 3 @ K160 Brake System Control Module Harness Connector & Ground ⇒ If 1 V or greater Repair the short to voltage on the circuit. ⇓ If less than 1 V
  5. Ignition/Vehicle » Off
  6. Test for infinite resistance between the test points: Terminal 2 @ K160 Brake System Control Module Harness Connector & Ground Terminal 3 @ K160 Brake System Control Module Harness Connector & Ground ⇒ If less than infinite resistance Repair the short to ground on the circuit. ⇓ If infinite resistance
  7. Test for less than 2 Ω between the test points: Terminal 1 @ Harness Connector - M104L Parking Brake Actuator - Left & Terminal 2 @ Harness Connector - K160 Brake System Control Module ⇒ If 2 Ω or greater » Repair the open/high resistance in the circuit. ⇓ If less than 2 Ω
  8. Test for less than 2 Ω between the test points: Terminal 2 @ Harness Connector - M104L Parking Brake Actuator - Left & Terminal 3 @ Harness Connector - K160 Brake System Control Module ⇒ If 2 Ω or greater » Repair the open/high resistance in the circuit. ⇓ If less than 2 Ω
  9. Connect a 25 A fused jumper wire between the test points: M104L Parking Brake Actuator - Left — Control terminal 1 & 12 V
  1. Momentarily connect a jumper wire between the test points: M104L Parking Brake Actuator - Left — Control terminal 2 & Ground Reverse the jumper wires 2 times between the terminals. Verify the component works as specified: M104L Parking Brake Actuator - Left = Apply & Release ⇒ If not the specified state Replace the component: M104L Parking Brake Actuator - Left ⇓ If the specified state
  2. Replace the component: K160 Brake System Control Module C060B 49, 92
  3. Ignition » On / Vehicle » In Service Mode
  4. Verify DTC is not set: ⇒ If the DTC is set 2.1. Perform the following learn procedure: Park Brake Calibration. 2.2. Ignition » On / Vehicle » In Service Mode 2.3. Apply the parking brake. 2.4. Release the parking brake. 2.5. Verify the DTC does not set. ⇒ If the DTC sets » Replace the component: M104L Parking Brake Actuator - Left ⇓ If the DTC is not set 2.6. All OK. ⇓ If the DTC is not set
  5. All OK. Repair Instructions Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification Parking Brake Actuator Replacement For control module replacement, programming, and setup refer to: Control Module References