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DTC B2471, Interior Lights Fault: Testing

  1. Open vehicle door. If interior lights are on, go to step 3). If interior lights are not on, go to next step.
  2. Remove courtesy relay. Disconnect PZM connector. Using DVOM, check resistance between courtesy relay connector terminal B7 (Dark Blue wire) and ground. If resistance is 5 ohms or less, repair short to ground in Dark Blue wire between PZM and courtesy relay. If resistance is greater than 5 ohms, replace PZM.
  3. Remove courtesy relay. Using DVOM, check voltage between courtesy relay connector terminal A9 (Orange wire) and ground. If voltage is greater than one volt, go to next step. If voltage is one volt or less, repair open or short to ground in Orange wire between courtesy relay and engine compartment fuse/relay center.
  4. Check voltage between courtesy relay connector terminal B7 (Dark Blue wire) and ground. If voltage is one volt or less, replace courtesy relay. If voltage is greater than one volt, check for short to voltage in Dark Blue wire between PZM and courtesy relay. If circuit is okay, replace PZM.
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