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 K2500, 6.0 UREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1596 (DATA COMMUNICATION SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC U1815CIRCUIT/SYSTEM TESTING
2006 Chevrolet Suburban K2500, 6.0 U
Circuit/System Testing
2006 Chevrolet Suburban K2500, 6.0 USECTION Circuit/System Testing
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 X1 at the PIM.
- Test for less than 5 ohms between the PIM case and ground.
- If greater than the specified range, test the ground strap for an open/high resistance. If the circuit tests normal, replace the PIM.
- Ignition ON, verify that a test lamp illuminates between the following voltage circuit terminals of the PIM and ground.
- Terminal 6
- Terminal 7
- Terminal 20
- If the test lamp does not illuminate, test the circuit for a short to ground or an open/high resistance.
- Ignition ON, verify that a test lamp illuminates between the signal circuit terminal 19 and ground.
- If the test lamp does not illuminate, test the circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the SDGM.
- Ignition OFF, disconnect the harness connector X3 at the engine control module.
- Test for less than 1.0 ohm on the high speed hybrid GMLAN serial data circuits between the following ECM and PIM circuit terminals.
- ECM X 3 terminal 53 and PIM X 1 terminal 11
- ECM X 3 terminal 33 and PIM X 1 terminal 10
- If greater than the specified range, test the circuit for open/high resistance
- If all circuits test normal, replace the PIM.
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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.