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 MANUALSCADILLAC2013ESCALADE ESV PLATINUM, RWDREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTHEADLIGHTSLIGHTING SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESDTC B2645CIRCUIT/SYSTEM TESTING
2013 Cadillac Escalade ESV Platinum, RWD
Circuit/System Testing
2013 Cadillac Escalade ESV Platinum, RWDSECTION Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the ambient light sensor.
- Test for less than 5.0 Ξ© between the ground circuit listed below and ground.
- Ambient Light Sensor terminal C - CJ2
- Ambient Light Sensor terminal B - w/o CJ2
- If greater than the specified range, test the ground circuit for an open/high resistance.
- Ignition ON, verify the scan tool Ambient Light Sensor parameter is greater than 4.5 V.
- If less than the specified range, test the signal circuit for a short to ground. If the circuit tests normal, replace the BCM.
- Install a 3 A fused jumper wire between the signal circuit terminal listed below and the low reference circuit terminal listed below. Verify the scan tool Ambient Light Sensor parameter is less than 1.0 V.
- Ambient Light Sensor terminals A to B - w/o CJ2
- Ambient Light Sensor terminals D to C - CJ2
- If greater than the specified range, 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 ambient light sensor.
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.