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 MANUALSISUZU2006ASCENDER S, 5.3 M, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 349 (LIGHTING SYSTEMS)DIAGNOSTIC INFORMATION & PROCEDURESDTC B2645CIRCUIT/SYSTEM TESTING
2006 Isuzu Ascender S, 5.3 M, 4WD
Circuit/System Testing
2006 Isuzu Ascender S, 5.3 M, 4WDSECTION Circuit/System Testing
WARNING: This page is about a different car, the 2008 Isuzu Ascender, 2008 GMC Envoy, and 2008 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the harness connector at the ambient light sensor.
- Ignition OFF, test for less than 1 ohm of resistance between the listed low reference circuit terminal and ground.
- Ambient light sensor terminal B
- Ambient light/sunload sensor terminal C
- If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the BCM.
- Ignition ON, verify the scan tool light sensor parameter is greater than 4.9 volts.
- If less than the specified range, test the listed signal circuit terminal for a short to ground. If the circuit tests normal, replace the BCM.
- Ambient light sensor terminal A
- Ambient light/sunload sensor terminal D
- If less than the specified range, test the listed signal circuit terminal for a short to ground. If the circuit tests normal, replace the BCM.
- Install a 3A fused jumper wire between the listed signal circuit terminal and the low reference circuit terminal. Verify the scan tool light sensor parameter is less than 1.0 volt.
- Ambient light sensor terminal A to B
- Ambient light/sunload sensor terminal D to C
- 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.
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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.