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 MANUALSCADILLAC2000DEVILLE DHSREPAIR AND DIAGNOSISBODY & FRAMEDOOR LOCKSPOWER DOOR LOCK SYSTEMDIAGNOSTIC TESTSDTC B3147: PASSENGER UNLOCK SWITCH CIRCUIT LOWDIAGNOSTIC PROCEDURE
2000 Cadillac DeVille DHS
Diagnostic Procedure
2000 Cadillac DeVille DHSSECTION Diagnostic Procedure
- Perform DIAGNOSTIC SYSTEM CHECK under SELF-DIAGNOSTIC SYSTEM. Go to next step.
- Install scan tool. Turn ignition switch to ON position. Using scan tool, observe DOOR LOCK SWITCH parameter in INPUTS list of passenger door control module that set DTC. If scan tool displays IDLE, go to next step. If scan tool does not display IDLE, go to step 4 .
- Activate associated passenger door lock switch. Using scan tool, observe DOOR LOCK SWITCH parameter. If DOOR LOCK SWITCH parameter changes state, see DIAGNOSTIC AIDS . If DOOR LOCK SWITCH parameter does not change state, go to next step.
- Turn ignition off. Disconnect applicable passenger door lock switch connector. Turn ignition switch to ON position. Using scan tool, observe DOOR LOCK SWITCH parameter in INPUTS list of passenger door control module that set DTC. If scan tool indicates IDLE state, go to step 7 . If scan tool does not indicate IDLE state, go to next step.
- Test Dark Blue wire between applicable passenger door lock switch and door control module for short to ground. If problem was found, repair as necessary and go to step 10 . If problem was not found, go to next step.
- Check applicable door control module connector for poor connections. If problem was found, repair as necessary and go to step 10 . If problem was not found, go to step 8 .
- Check applicable passenger door lock switch connector for poor connections. If problem was found, repair as necessary and go to step 10 . If problem was not found, go to step 9 .
- Replace applicable passenger door control module. See DOOR CONTROL MODULE under REMOVAL & INSTALLATION. After repairs, go to step 10 .
- Replace applicable door lock switch. See DOOR LOCK SWITCH under REMOVAL & INSTALLATION. After repairs, go to next step.
- Using scan tool, clear DTCs. Operate vehicle within conditions for running DTC. If DTC does not reset, system is okay.
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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.