Network, generic (extended)

U352D High Voltage System Interlock Circuit J

Check engine lightOn
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

U352D is the summary code for interlock circuit J, the ninth loop in J2012 lettering, which leaves out the letter I. What the loop contains is up to the maker, and none has published it. A loop need not pass through plugs only: a Ford patent for a centralised interlock leads the circuit across mating body parts such as the hood or trunk latch and its receptacle, so that opening the lid by itself switches high voltage off; floor access panels are named as a further option. Where a design like this is used, a lid that has not fully latched can explain a fault on loop J. Check latches before wiring; the vehicle cannot become ready until the loop is complete.

Likely causes

Connector in loop J not fully latched
Hood, trunk or access panel latch wired into loop J not fully engaged
Loop J wiring damaged
Controller that drives and reads loop J faulty

Symptoms

  • No ready mode, often right after a hood, trunk or underbody panel was opened
  • High-voltage system warning in the instrument cluster
  • Charging blocked

Repair estimate

DifficultyHardWorkshop job
Parts and labour€60–1,500
Time0.5–4 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

hvil loop jhv connectors

Related codes

U352EU352FU3530U3529P0A0A

References: patents.google.com, law.cornell.edu.