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Tahoe / Yukon Service Manual

Heated Steering Wheel Indicator Malfunction

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. Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performanc
Ignition 1 1 — —
Switch Signal 2 1 — —
Indicator Dimming Control 3 3 — —
Heated Steering Wheel Switch LED Control 4 3 3 —
Switch Ground — 1 — —
Module Ground — 1 — —
1. Heated Steering Wheel System Inoperative 2. Heated Steering Wheel Always ON 3. LED Inoperative 4. LED Always ON

Circuit/System Description The Heated Steering Wheel Module controls the heated steering wheel and the heated steering wheel ON indicator based on an input from the heated steering wheel switch. When the heated steering wheel switch is pressed, the switch signal circuit is pulled to ground. This indicates to the heating steering wheel control module that steering wheel heat is requested. When the request is seen, the heated steering module supplies voltage to the indicator lamp and supplies voltage to the heating elements, which are internal to the steering wheel. Reference Information Schematic Reference Steering Wheel Schematics Connector End View Reference Master Electrical Component List Description and Operation Steering Wheel and Column Description and Operation Electrical Information Reference Circuit Testing Connector Repairs Testing for Intermittent Conditions and Poor Connections Wiring Repairs Circuit/System Verification

  1. Ignition ON.
  2. Verify the Heated Steering Wheel Switch – S70L Cruise Control Switch is OFF. The steering wheel heater indicator should not be illuminated and the left and right sides of the steering wheel should not be warm. ⇒ The steering wheel is always warm Refer to Heated Steering Wheel Malfunction ⇒ The steering wheel does not become warm and the heater indicator is illuminated Refer to Circuit/System Testing ⇓ The steering wheel does not become warm and the heater indicator is not illuminated
  3. Press and release the Heated Steering Wheel Switch – S70L Cruise Control Switch. The steering wheel heater indicator should illuminate and the left and right sides of the steering wheel should become warm. ⇒ The steering wheel does not become warm Refer to Heated Steering Wheel Malfunction ⇒ The steering wheel becomes warm and the heater indicator does not illuminate Refer to Circuit/System Testing ⇓ The steering wheel becomes warm and the heater indicator illuminates
  4. All OK. Circuit/System Testing
  5. Ignition OFF, disconnect the X2 harness connector at the K32 Heated Steering Wheel Module.
  6. Test for less than 10 Ω between the ground circuits listed below and ground. Terminal 4 Terminal 5 ⇒ If 10 Ω or greater 2.1. Ignition OFF. 2.2. Test for less than 2 Ω in the ground circuit end to end. ⇒ 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
  7. Ignition ON.
  8. Verify a test lamp illuminates between the ignition voltage circuit terminal 3 and ground. ⇒ If the test lamp does not illuminate and the circuit fuse is good 4.1. Ignition OFF, remove the test lamp. 4.2. Test for less than 2 Ω in the ignition circuit end to end. ⇒ If less than 2 Ω, verify the fuse is OK and there is voltage at the fuse. Refer to Power Mode Mismatch. ⇓ If 2 Ω or greater 4.3. Verify the in-line fuse is OK and there is voltage at the fuse. ⇒ If the in-line fuse is blown, replace the K32 Heated Steering Wheel Module. ⇒ If the in-line fuse is OK, repair the open/high resistance in the circuit. ⇒ If the test lamp does not illuminate and the circuit fuse is open 4.1. Ignition OFF. 4.2. Test for infinite resistance between the ignition voltage circuit and ground. ⇒ If less than infinite resistance, repair the short to ground on the circuit. ⇒ If infinite resistance, replace the K32 Heated Steering Wheel Module. ⇓ If the test lamp illuminates
  9. Ignition OFF, connect the X2 harness connector. Disconnect the harness connector at the S70L Cruise Control Switch. Ignition ON.
  10. Verify a test lamp illuminates between the signal voltage circuit terminal 9 and ground. ⇒ If the test lamp does not illuminate 6.1. Ignition OFF, disconnect the harness connector at the S70R Radio Control Switch - Steering Wheel. 6.2. Test for infinite resistance between the signal circuit and ground. ⇒ If less than infinite resistance, repair the short to ground on the circuit. ⇓ If infinite resistance 6.3. Test for less than 2 Ω in the signal circuit end to end. ⇒ If 2 Ω or greater, repair the open/high resistance in the circuit. ⇒ If less than 2 Ω, replace the S70R Radio Control Switch - Steering Wheel. ⇓ If the test lamp illuminates
  11. Test for less than 1 V between the control circuit terminal 7 and ground. ⇒ If greater than 1 V 7.1. Disconnect the X2 harness connector at the K32 Heated Steering Wheel Module. 7.2. Test for less than 1 V between the control circuit terminal 2 and ground. ⇒ If greater than 1 V, repair the short to voltage on the circuit. ⇓ If less than 1 V 7.3. Replace the K32 Heated Steering Wheel Module. ⇓ If infinite resistance
  12. Ignition OFF.
  13. Test for infinite resistance between the control circuit terminal 7 and ground. ⇒ If less than infinite resistance 9.1. Disconnect the X2 harness connector at the K32 Heated Steering Wheel Module. 9.2. Test for infinite resistance between the signal circuit and ground. ⇒ If less than infinite resistance, repair the short to ground on the circuit. ⇓ If infinite resistance 9.3. Replace the K32 Heated Steering Wheel Module. ⇓ If infinite resistance
  14. Install a 3 A fused jumper wire between the control circuit terminal 7 and ground. Ignition ON.
  15. Verify the steering wheel heat indicator is illuminated. ⇒ If the steering wheel heat indicator does not illuminate 11.1. Disconnect the X2 harness connector at the K32 Heated Steering Wheel Module. 11.2. Test for less than 2 Ω in the signal circuit end to end. ⇒ If 2 Ω or greater, repair the open/high resistance in the circuit. ⇒ Replace the S70L Cruise Control Switch ⇓ If the steering wheel heat indicator illuminates
  16. Replace the K32 Heated Steering Wheel Module. Repair Instructions Perform the Diagnostic Repair Verification after completing the repair Control Module References for control module replacement, programming and setup