One problem related to wiring has been reported for the 2003 Infiniti M45. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2003 Infiniti M45 based on all problems reported for the 2003 M45.
Faulty gas gauge readings and check engine light with code 0462. Troubleshooting revealed no +12 v from instrument cluster (combination meter) to fuel level sensor. No opens or shorts in wiring harness. All points to a defective gauge cluster.