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Tahoe / Yukon Service Manual

Drive Mode Switch Malfunction

Secondary and Configurable Customer Controls | Diagnostic Information and Procedures | Document ID: 5659871 Diagnostic Instructions Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach. Diagnostic Procedure Instructions provides an overview of each diagnostic category. DTC Descriptors DTC P05D1 Drive Mode Select Swtich Circuit Low DTC P05D2 Drive Mode Select Switch Circuit High DTC P05D3 Drive Mode Select Switch Circuit Performance For symptom byte information, refer to Symptom Byte List. Diagnostic Fault Information

Circuit number Circuit Function Short to Ground Open/High Resistance Short to Voltage Signal Performan
2203 Signal P05D1 — P05D2 P05D3
1449 Low Reference P05D1 — — —

Circuit/System Description The S126 Ride Control Switch is a normally open switch that closes when the switch is pressed. The K9 Body Control Module monitors the switch on signal circuit 2203. The S126 Ride Control Switch uses circuit 1449 for a low reference. When the drive mode select switch is not pressed, the switch is open and signal voltage observed by the K9 Body Control Module is high. When the drive mode select switch is pressed, the switch is closed and signal voltage observed by the K9  Body Control Module is low. Conditions for Running the DTC Ignition ON Conditions for Setting the DTC Circuit 2203 is shorted to ground Circuit 2203 is open Action Taken When the DTC Sets No action is taken. Conditions for Clearing the DTC The condition for setting the DTC is no longer present. Diagnostic Aids Holding the Drive Mode Select Switch for an extend period of time may cause a DTC to set. Reference Information Schematic Reference Steering Wheel Secondary/Configurable Control Schematics Connector End View Reference Master Electrical Component List Description and Operation Drive Mode 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 for scan tool information Circuit/System Testing

  1. Ignition/vehicle OFF, disconnect the harness connector at the S126 Ride Control Switch.
  2. Verify a test lamp illuminates between the low reference terminal 3 and B+. ⇒ If the test lamp does not illuminate 2.1. Test circuit 1449 for an open/high resistance. ⇒ If an open/high resistance is found, repair the fault on the circuit. ⇓ If an open/high resistance is not found. 2.2. Replace the K9 Body Control Module. ⇓ If the test lamp illuminates
  3. Ignition/vehicle OFF, disconnect the X2 connector at the K9 Body Control Module.
  4. Test for infinite resistance between signal circuit terminal 10 and ground. ⇒ If less than infinite resistance 4.1. Test circuit 2203 for a short to ground. ⇒ If a short to ground is found, repair the fault on the circuit. ⇓ If a short to ground is not found. 4.2. Replace the S126 Ride Control Switch. ⇓ If infinite resistance
  5. Connect the connector at the S126 Ride Control Switch.
  6. Press and hold the S126 Ride Control Switch.
  7. Test for less than infinite resistance between signal circuit terminal 2203 and ground. ⇒ If infinite resistance 7.1. Disconnect the connector at the S126 Ride Control Switch. 7.2. Test the low reference circuit 1449 for an open/high resistance. ⇒ If an open/high resistance is found, repair the fault on the circuit. ⇓ If an open/high resistance is not found. 7.3. Test signal circuit 2203 for an open/high resistance. ⇒ If an open/high resistance is found, repair the fault on the circuit. ⇓ If an open/high resistance is not found. 7.4. Replace the S126 Ride Control Switch. ⇓ If less than infinite resistance
  8. Replace the K9 Body Control Module. Repair Instructions Perform the Diagnostic Repair Verification after completing the repair. Control Module References for control module replacement, programming, and setup.