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.
2009 Cadillac Escalade EXTFACTORY OEM SERVICE PROCEDURE
Circuit/System Testing
- Ignition OFF, disconnect harness connector X1 of the APM.
- Ignition ON, test for B+ between the wake up signal circuit terminal 3 and ground.
- If less than the specified value, test the circuit for an open/high resistance. If the circuit tests normal, replace the SDGM.
- Ignition OFF, disconnect harness connector X3 of the APM.
- Ignition ON, test for B+ between the B+ circuit terminal 1 and ground.
- If less than the specified value, test the circuit for an open/high resistance. If the circuit tests normal, replace the SDGM.
- Disconnect harness connector X1 of the EBCM.
- Test for less than 1.0 ohm between the APM and the EBCM on the following circuit terminals.
- PTLAN + APM terminal 5 and EBCM terminal 33
- PTLAN - APM terminal 4 and EBCM terminal 21
- If greater than the specified range, test the circuit for an open/high resistance.
- Ignition OFF, disconnect harness connector X1 of the SDGM.
- Test for less than 1.0 ohm between the EBCM and the SDGM on the following circuit terminals.
- PTLAN + EBCM terminal 34 and SDGM terminal 13
- PTLAN - EBCM terminal 22 and SDGM terminal 11
- If greater than the specified range, test the circuit for an open/high resistance.
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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