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Tahoe / Yukon Service Manual

DTC C1162 (1)

DTC C1162 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 C1162 Transfer Case Lock Solenoid Valve Control Symptom Byte Information: Symptom Byte List. Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performanc
12 V Reference — Terminal B @ A16 Transfer Case Four Wheel Drive Actuator C1162 11 C1162 13 C1162 12 —
Control — Terminal C @ A16 Transfer Case Four Wheel Drive Actuator C1162 11 C1162 13 C1162 12 C116E 67

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

Circuit Description
12 V Reference — Terminal B @ A16 Transfer Case Four Wheel Drive Actuator Regulated voltage supplied by the control module.
Control — Terminal C @ A16 Transfer Case Four Wheel Drive Actuator The output circuit is switched to ground to activate the component.
Component Description
A16 Transfer Case Four Wheel Drive Actuator The motor is bidirectional.
K69 Transfer Case Control Module The control module contains a microprocessor used to process input data to control outputs.

di i f i h 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 Conditions for Setting the DTC C1162 12 Voltage = 0.85 to 1.057 V C1162 11 Voltage = 0 to 0.107 V C1162 13 Condition 1 Voltage = 0 to 0.107 V Condition 2 Voltage = 0.85 to 1.057 V Actions Taken When the DTC Sets Shifting = Disabled Driver Information Display = Service 4WD 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 C1162 is not set. ⇒ If the DTC is set Refer to: Circuit/System Testing ⇓ If the DTC is not set
  3. 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
  4. All OK. Circuit/System Testing
  5. Ignition/Vehicle & All vehicle systems » Off
  6. Disconnect the electrical connector: A16 Transfer Case Four Wheel Drive Actuator
  7. Ignition » On / Vehicle » In Service Mode
  1. Test for 10.5 to 11.5 V between the test points: 12 V Reference circuit terminal B & Ground ⇒ If less than 10.5 V 4.1. Ignition/Vehicle » Off 4.2. Disconnect the electrical connector: K69 Transfer Case Control Module 4.3. Test for infinite resistance between the test points: 12 V Reference circuit terminal B @ Component harness & Ground ⇒ If less than infinite resistance » Repair the short to ground on the circuit. ⇓ If infinite resistance 4.4. Test for less than 2 Ω between the test points: 12 V Reference circuit terminal B @ Component harness & Terminal 33 @ Control module harness ⇒ If 2 Ω or greater » Repair the open/high resistance in the circuit. ⇒ If less than 2 Ω » Replace the component: K69 Transfer Case Control Module ⇒ If greater than 11.5 V 4.1. Ignition/Vehicle » Off 4.2. Disconnect the electrical connector: K69 Transfer Case Control Module 4.3. Ignition » On / Vehicle » In Service Mode 4.4. Test for less than 1 V between the test points: 12 V Reference circuit terminal B @ 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 between 10.5 and 11.5 V
  2. Test for less than 1 V between the test points: Control circuit terminal C & Ground ⇒ If 1 V or greater 5.1. Ignition/Vehicle » Off 5.2. Disconnect the electrical connector: K69 Transfer Case Control Module 5.3. Ignition » On / Vehicle » In Service Mode 5.4. Test for less than 1 V between the test points: Control circuit terminal C @ 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 1 V
  3. Ignition/Vehicle » Off
  4. Disconnect the electrical connector: K69 Transfer Case Control Module
  5. Test for infinite resistance between the test points: Control circuit terminal C @ Component harness & Ground ⇒ If less than infinite resistance » Repair the short to ground on the circuit. ⇓ If infinite resistance
  6. Test for less than 2 Ω between the test points: Control circuit terminal C @ Component harness & Control circuit terminal 34 @ Control module harness ⇒ If 2 Ω or greater » Repair the open/high resistance in the circuit. ⇓ If less than 2 Ω
  7. Connect the electrical connector: A16 Transfer Case Four Wheel Drive Actuator
  8. Ignition/Vehicle » Off
  9. Connect a 3 A fused jumper wire between the test points: 12 V Reference circuit terminal 33 @ Control module harness & B+
  10. Momentarily connect a jumper wire between the test points: Control circuit terminal 34 @ Control module harness & Ground Verify the component produces a clicking sound: A16 Transfer Case Four Wheel Drive Actuator ⇒ If the component does not produce a sound Replace the component: A16 Transfer Case Four Wheel Drive Actuator ⇓ If the component produces a sound
  11. Replace the component: K69 Transfer Case Control Module Repair Instructions Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification Transfer Case Two/Four Wheel Drive Actuator Replacement — A16 Transfer Case Four Wheel Drive Actuator For control module replacement, programming, and setup refer to: Control Module References