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Tahoe / Yukon Service Manual

DTC C15D4

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 C15D4 Vehicle Stability Control System Switch 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
1788 Signal C15D4 9E 1 — —
1851 Ground — 1 — —
1. Traction Control Switch Inoperative

Scan Tool Data Traction Control Switch

Control Module Data List Values Normal Operation
K9 Body Control Module Chassis Control Data Active/Inactive The parameter will switch between inactive and active when the traction control switch is pressed.

Circuit/System Description The K9 Body Control Module monitors the switch on signal circuit 1788 and the switch receives a constant ground on ground circuit 1851. When the traction control switch is pressed once, the K9  Body Control Module requests the brake system K160 Brake System Control Module via serial data to disable the traction control. The K160 Brake System Control Module commands the instrument cluster via serial data to turn the traction control off indicator ON and display the Traction Control Off message on the driver information center to notify the driver of the deactivation. When the traction control switch is pressed and held for five seconds, the K9 Body Control Module requests the K160 Brake System Control Module to disable the traction control and stability control. The K160 Brake System Control Module commands the instrument cluster via serial data to turn the traction control off indicator ON and the traction/stability indicator ON to notify the driver of the deactivation. Conditions for Running the DTC Ignition ON Conditions for Setting the DTC Circuit 1788 is shorted to ground The traction control switch is stuck closed Action Taken When the DTC Sets The body control module ignores the traction control switch signal input. Conditions for Clearing the DTC The condition for setting the DTC is no longer present. Reference Information Schematic Reference Antilock Brake System Schematics Connector End View Reference Master Electrical Component List Description and Operation ABS 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 Verification

  1. Ignition ON.
  2. Verify the scan tool Traction Control Switch parameter changes between Active and Inactive when pressing and releasing the traction control switch. ⇒ If the parameter does not change Refer to Circuit/System Testing. ⇓ If the parameter changes
  3. All OK. A fault is currently not present and may be an intermittent condition. Circuit/System Testing
  4. Ignition OFF, disconnect the connector at the S86 Vehicle Stability Control System Switch.
  5. Verify a test lamp illuminates between terminal 10 and B+ ⇒ If the test lamp does not illuminate Repair the open/high resistance on circuit 1851 or the ground connection. ⇓ If the test lamp illuminates
  6. Ignition ON.
  7. Verify the scan tool Traction Control Switch parameter is Inactive. ⇒ If not Inactive 4.1. Test circuit 1788 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 K9 Body Control Module. ⇓ If Inactive
  8. Install a 3 A fused jumper wire between terminal 1 and ground.
  9. Verify the scan tool Traction Control Switch parameter is Active. ⇒ If not Active 6.1. Test circuit 1788 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 6.2. Replace the K9 Body Control Module. ⇓ If Active
  10. Test or replace the S86 Vehicle Stability Control System Switch. Component Testing
  11. Ignition OFF, disconnect the harness connector at the S86 Vehicle Stability Control System Switch.
  12. Test for infinite resistance between the signal terminal 1 and the ground terminal 10 with the switch in the open position. ⇒ If less than infinite resistance Replace the S86 Vehicle Stability Control System Switch. ⇓ If infinite resistance
  13. Test for less than 2 Ω between the signal circuit terminal 1 and the ground terminal 10 with the switch in the closed position. ⇒ If 2 Ω or greater Replace the S86 Vehicle Stability Control System Switch. ⇓ If less than 2 Ω
  14. All OK. Repair Instructions Perform the Diagnostic Repair Verification after completing the repair. Control Module References for control module replacement, programming, and setup.