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.
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HOMESERVICE MANUALSCHEVROLET2006SUBURBAN C2500, 6.0 UREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1552 (LIGHTING SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESHEADLAMPS MALFUNCTIONCIRCUIT/SYSTEM TESTINGTURN SIGNAL/MULTIFUNCTION SWITCH MALFUNCTION
2006 Chevrolet Suburban C2500, 6.0 U
Turn Signal/Multifunction Switch Malfunction
2006 Chevrolet Suburban C2500, 6.0 USECTION Turn Signal/Multifunction Switch Malfunction
WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the harness connector at the turn signal/multifunction switch.
- Ignition OFF, verify that a test lamp illuminates between B+ and the appropriate ground circuit terminal listed below.
- Ground terminal A - with MH2
- Ground terminal G - without MH2
- If greater than the specified range, test the ground circuit for an open/high resistance.
- Ignition ON, verify the scan tool Flash to Pass Switch parameter is Inactive.
- If not the specified value, test the appropriate signal circuit terminal listed below for a short to ground. If the circuit tests normal, replace the BCM.
- Signal terminal C - with LE5 and MH2
- Signal terminal J - without LE5 and MH2
- If not the specified value, test the appropriate signal circuit terminal listed below for a short to ground. If the circuit tests normal, replace the BCM.
- Verify the scan tool High Beam Select Switch parameter is Inactive.
- If not the specified value, test the appropriate signal circuit terminal listed below for a short to ground. If the circuit tests normal, replace the BCM.
- Signal terminal B - with LE5 and MH2
- Signal terminal H - without LE5 and MH2
- If not the specified value, test the appropriate signal circuit terminal listed below for a short to ground. If the circuit tests normal, replace the BCM.
- Install a 3A fused jumper wire between the appropriate signal circuit terminal listed below and ground. Verify the scan tool Flash to Pass Switch parameter is Active.
- Signal terminal C - with LE5 and MH2
- Signal terminal J - without LE5 and MH2
- If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
- Install a 3A fused jumper wire between the appropriate signal circuit terminal listed below and ground. Verify the scan tool High Beam Select Switch parameter is Active.
- Signal terminal B - with LE5 and MH2
- Signal terminal H - without LE5 and MH2
- If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
- If all circuits test normal, test or replace the turn signal/multifunction switch.
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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.