Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

2015 Chevrolet Tahoe LTZ, 4WDFACTORY OEM SERVICE PROCEDURE

Circuit/System Testing

Ignition OFF, disconnect the harness connector at the S48D Multifunction Switch 2 - Instrument Panel, ignition ON.
Verify a test lamp illuminates between the control circuit terminal 3 and ground.
- If the test lamp does not illuminate
1. Ignition OFF, disconnect the harness connector at the K9 Body Control Module.
2. Test for less than 2 Ω in the control circuit end to end.
  - If 2 Ω or greater, repair the open/high resistance in the circuit.
  - If less than 2 Ω, refer to Interior Backlighting Malfunction .
- If the test lamp illuminates
Ignition OFF, connect the harness connector at the S48D Multifunction Switch 2 - Instrument Panel. Disconnect the X1 harness connector at the K124 Active Safety Control Module, ignition ON.
Verify the lane departure warning switch indicator is not illuminated.
- If the lane departure warning switch indicator is illuminated
1. Ignition OFF, disconnect the harness connector at the S48D Multifunction Switch 2 - Instrument Panel.
2. Test for infinite resistance between the S48D Multifunction Switch 2 - Instrument Panel control circuit terminal 9 and ground.
  - If less than infinite resistance, repair the short to ground in the circuit.
  - If infinite resistance, replace the S48D Multifunction Switch 2 - Instrument Panel.
- If the lane departure warning switch indicator is not illuminated
Connect a 3 A fused jumper wire between the control circuit terminal 3 and ground.
Verify the lane departure warning switch indicator is illuminated.
- If the lane departure warning switch indicator is not illuminated
1. Ignition OFF, disconnect the harness connector at the S48D Multifunction Switch 2 - Instrument Panel.
2. Test for less than 1 V between the control circuit and ground.
  - If 1 V or greater, repair the short to voltage on the circuit.
  - If less than 1 V
3. Ignition OFF.
4. Test for less than 2 Ω in the control circuit end to end.
  - If 2 Ω or greater, repair the open/high resistance in the circuit.
  - If less than 2 Ω, replace the S48D Multifunction Switch 2 - Instrument Panel.
- If the lane departure warning switch indicator is illuminated
Replace the K124 Active Safety Control Module.

Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.

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