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Tahoe / Yukon Service Manual

DTC C10BA, C116F, C118D, or C119C (1)

DTC C10BA, C116F, C118D, or C119C 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 C10BA Secondary Axle Motor Relay Control DTC C116F Four Wheel Drive Wheel Lock Indicator DTC C118D Front Axle Actuator Control DTC C119C Front Axle Engagement System Symptom Byte Information: Symptom Byte List Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performanc
Ignition — Terminal 1 @ M26 Front Drive Axle Actuator C119C 67 C119C 67 — —
Control — Terminal 11 @ K69 Transfer Case Control Module C10BA 11 C10BA 13 C10BA 12 —
Control — Terminal 2 @ M26 Front Drive Axle Actuator C119C 67 C116F 13 C116F 12 C116F 1C
Signal — Terminal 3 @ M26 Front Drive Axle Actuator C118D 11 C118D 13 C118D 12 —
Ground — Terminal 4 @ M26 Front Drive Axle Actuator — C119C 67 — —

Circuit/System Description For an overview of the component/system, refer to: Transfer Case Description and Operation

Circuit Description
Ignition — Terminal 1 @ M26 Front Drive Axle Actuator Supplied from a fuse.
Circuit Description
Control — Terminal 11 @ K69 Transfer Case Control Module The output circuit is switched to ground to activate the component.
Control — Terminal 2 @ M26 Front Drive Axle Actuator The output circuit is switched to ground to activate the component.
Signal — Terminal 3 @ M26 Front Drive Axle Actuator The output circuit varies between ground and 12 V.
Ground — Terminal 4 @ M26 Front Drive Axle Actuator Chassis Ground
Component Description
K69 Transfer Case Control Module The control module contains a microprocessor used to process input data to control outputs.
M26 Front Drive Axle Actuator Front Drive Axle Actuator

Conditions for Running the DTC Ignition = On System Voltage = 9 to 17.5 V Frequency the DTC runs = Continuously — After the running conditions are met — For greater than 1 s Conditions for Setting the DTC DTC C10BA 11 Secondary Axle Motor Relay Control = Short to Ground DTC C10BA 12 Secondary Axle Motor Relay Control = Short to Voltage DTC C10BA 13 Secondary Axle Motor Relay Control = Open DTC C116F 12 4WD Locked Range Indicator Control = Short to Voltage DTC C116F 13 4WD Locked Range Indicator Control = Open DTC C116F 1C 4WD Locked Range Indicator Control = Voltage Out of Range C118D 11 Front Axle Engagement Actuator Control Circuit = Short to Ground C118D 12 Front Axle Engagement Actuator Control Circuit = Short to Voltage C118D 13 Front Axle Engagement Actuator Control Circuit = Open C119C 67 5 s after a range change, the transfer case control module compares the commanded state of the front axle (Front Axle Engagement Actuator Command parameter) to the monitored state of the front axle (Front Axle Feedback Switch parameter). If the command state differs from the monitored state for more than a predetermined amount of time, the DTC sets. Actions Taken When the DTC Sets C10BA 11, 12, 13 The front axle remains in current mode. Transfer case normal operation. The SERVICE 4WD indicator remains illuminated for the remainder of the current ignition cycle. The range indicator for the current range shall illuminate. C116F 12, 13, 1C The front axle remains in current mode. Transfer case normal operation. The SERVICE 4WD indicator remains illuminated for the remainder of the current ignition cycle. The range indicator for the current range shall illuminate. C118D 11 The front axle remains engaged at all times. Transfer case normal operation. The SERVICE 4WD indicator remains illuminated for the remainder of the current ignition cycle. The range indicator for the current range shall illuminate. C118D 12, 13 The front axle remains disengaged at all times. Transfer case normal operation. The SERVICE 4WD indicator remains illuminated for the remainder of the current ignition cycle. The range indicator for the current range shall illuminate. C119C 67 The front axle remains in current mode. Transfer case normal operation. The SERVICE 4WD indicator remains illuminated for the remainder of the current ignition cycle. The range indicator for the current range shall illuminate. 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. Reference Information Schematic Reference Transfer Case Control 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. Ignition » On / Vehicle » In Service Mode
  2. Verify DTC C10BA is not set. ⇒ If the DTC is set Refer to: Circuit/System Testing — Test 1 ⇓ If the DTC is not set
  3. Verify DTC C116F, C118D, C119C is not set. ⇒ If the DTC is set Refer to: Circuit/System Testing — Test 2 ⇓ If the DTC is not set
  4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data. Verify the DTC does not set. ⇒ If the DTC sets Refer to: Circuit/System Testing ⇓ If the DTC is not set
  5. All OK. Circuit/System Testing Test 1
  6. Ignition/Vehicle & All vehicle systems » Off
  7. Disconnect the electrical connector: K69 Transfer Case Control Module
  8. Verify a test lamp turns On between the test points: Control circuit terminal 11 & Ground ⇒ If the test lamp does not turn On 3.1. Disconnect the electrical connector: X3 @ X50A Engine Wiring Harness Junction Block 3.2. Test for infinite resistance between the test points: Control circuit terminal 11 @ Control module harness & Ground ⇒ If less than infinite resistance » Repair the short to ground on the circuit. ⇓ If infinite resistance 3.3. Test for less than 2 Ω between the test points: Control circuit terminal 11 @ Control module harness & Output terminal @ Fuse ⇒ If 2 Ω or greater » Repair the open/high resistance in the circuit. ⇒ If less than 2 Ω » Test or replace the component: Front Axle Engagement Actuator Relay ⇓ If the test lamp turns On
  9. Remove the component: Front Axle Engagement Actuator Relay
  10. Ignition » On / Vehicle » In Service Mode
  11. Test for less than 1 V between the test points: Control circuit terminal 11 @ Control module harness & Ground ⇒ If 1 V or greater » Repair the short to voltage on the circuit. ⇓ If less than 1 V
  12. Clear DTCs
  13. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data. Verify the DTC does not set. ⇒ If the DTC sets Replace the component: K69 Transfer Case Control Module ⇓ If the DTC does not set
  14. All OK. Test 2
  1. Ignition/Vehicle & All vehicle systems » Off
  2. Disconnect the electrical connector: M26 Front Drive Axle Actuator
  3. Test for less than 10 Ω between the test points: Ground circuit terminal 4 & Ground ⇒ If 10 Ω or greater 3.1. Disconnect the ground connection: Ground Connection @ The other end of the circuit 3.2. Test for less than 2 Ω between the test points: Ground circuit terminal 4 & The other end of the circuit @ Ground Connection ⇒ 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. Disconnect the electrical connector: K69 Transfer Case Control Module
  5. Connect a 5 A fused jumper wire between the test points: Terminal 11 @ K69 Transfer Case Control Module & Ground Verify a test lamp turns On between the test points: Ignition circuit terminal 1 @ M26 Front Drive Axle Actuator & Ground ⇒ If the test lamp does not turn On and the circuit fuse is OK 5.1. Ignition/Vehicle » Off & Remove » Test lamp 5.2. Test for less than 2 Ω between the test points: Ignition circuit terminal 1 & Output terminal @ Fuse ⇒ If 2 Ω or greater » Repair the open/high resistance in the circuit. ⇒ If less than 2 Ω » Verify the fuse is OK and there is voltage at the fuse. ⇒ If the test lamp does not turn On and the circuit fuse is open 5.1. Ignition/Vehicle » Off & Remove » Test lamp 5.2. Test for infinite resistance between the test points: Ignition circuit terminal 1 & Ground ⇒ If less than infinite resistance » Repair the short to ground on the circuit. ⇒ If infinite resistance » Replace the component: M26 Front Drive Axle Actuator ⇓ If the test lamp turns On
  6. Remove » Jumper Wire(s)
  7. Connect the electrical connector: K69 Transfer Case Control Module
  8. Ignition » On / Vehicle » In Service Mode
  9. Test for less than 11 V between the test points: Control circuit terminal 2 @ M26 Front Drive Axle Actuator& Ground ⇒ If 11 V or greater 9.1. Ignition/Vehicle » Off 9.2. Disconnect the electrical connector: K69 Transfer Case Control Module 9.3. Ignition » On / Vehicle » In Service Mode 9.4. Test for less than 1 V between the test points: Control circuit terminal 2 @ Component harness & Ground ⇒ If 1 V or greater » Repair the short to voltage on the circuit. ⇒ If less than 1 V » Replace the component: K69 Transfer Case Control Module ⇓ If less than 11 V
  10. Ignition/Vehicle » Off
  11. Disconnect the electrical connector: K69 Transfer Case Control Module
  12. Test for infinite resistance between the test points: Control circuit terminal 2 @ Component harness & Ground ⇒ If less than infinite resistance Repair the short to ground on the circuit. ⇓ If infinite resistance
  13. Test for less than 2 Ω between the test points: Control circuit terminal 2 @ Component harness & Control circuit terminal 12 @ Control module harness ⇒ If 2 Ω or greater Repair the open/high resistance in the circuit. ⇓ If less than 2 Ω
  14. Connect the electrical connector: M26 Front Drive Axle Actuator
  15. Ignition » On / Vehicle » In Service Mode
  16. Momentarily connect a jumper wire between the test points: Control circuit terminal 12 X1 @ Control module harness & Ground Verify the component activates: M26 Front Drive Axle Actuator— Produces a sound ⇒ If the component does not produce a sound Replace the component: M26 Front Drive Axle Actuator ⇓ If the component produces a sound
  17. Momentarily connect a jumper wire between the test points: Control circuit terminal 12 @ Control module harness & Ground Test for battery voltage between the test points: Control circuit terminal 9 @ Control module harness & Ground ⇒ If less than battery voltage 17.1. Ignition/Vehicle » Off 17.2. Disconnect the electrical connector: M26 Front Drive Axle Actuator 17.3. Test for infinite resistance between the test points: Control circuit terminal 3 @ Component harness & Ground ⇒ If less than infinite resistance » Repair the short to ground on the circuit. ⇓ If infinite resistance 17.4. Test for less than 2 Ω between the test points: Control circuit terminal 3 @ Component harness & Control circuit terminal 9 @ Control module harness ⇒ If 2 Ω or greater » Repair the open/high resistance in the circuit. ⇒ If less than 2 Ω » Replace the component: M26 Front Drive Axle Actuator ⇓ If battery voltage
  18. Ignition/Vehicle » Off
  19. Disconnect the electrical connector: M26 Front Drive Axle Actuator
  20. Ignition » On / Vehicle » In Service Mode
  21. Test for less than 1 V between the test points: Control circuit terminal 3 @ Component harness & Ground ⇒ If 1 V or greater » Repair the short to voltage on the circuit. ⇓ If less than 1 V
  22. Clear DTCs
  23. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data. Verify the DTC does not set. ⇒ If the DTC sets Replace the component: K69 Transfer Case Control Module ⇓ If the DTC does not set
  24. All OK. Repair Instructions Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification Front Drive Axle Actuator Replacement — M26 Front Drive Axle Actuator For control module replacement, programming, and setup refer to: Control Module References