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Home / DTC / U352D — High Voltage System Interlock Circuit J

U352D — High Voltage System Interlock Circuit J

Detailed page for trouble code U352D.

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U352D

Generic U — Network/User

High Voltage System Interlock Circuit J

Brand: Generic
Type: U — Network/User
Views: UK: 21 EN: 44 RU: 13
AI status
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Page language: EN

Causes

  • Open circuit (broken wire) in Interlock Circuit J
  • Short to ground or battery voltage on the interlock wiring
  • Corroded, bent, or pushed-out connector pins at interlock or control module
  • Faulty interlock switch, service disconnect, or safety plug
  • Water intrusion or contamination at connector or interlock assembly
  • Failed HV control module or input circuit

Symptoms

  • HV system disabled or inhibited (vehicle may not start or enter EV/ready state)
  • HV warning lamp, charge system warning, or MIL on instrument cluster
  • Reduced propulsion or limp-home mode
  • Inability to charge or engage HV relays
  • Diagnostic trouble code U352D stored; possible related codes

What to check

  • Read live data and freeze frame with a capable scan tool; confirm U352D is current and note vehicle conditions when set
  • Verify technician high-voltage safety procedures and remove HV service plug where required before hands-on inspection
  • Visual inspection for corrosion, water ingress, physical damage at interlock connector and service disconnect
  • Check connector locking tabs and pin positions; inspect for bent/pushed-out pins
  • Perform continuity and insulation resistance checks of the interlock wiring harness (with HV system de-energized and service plug removed if required)
  • Measure voltage at the interlock connector with the system powered (only if allowed by safety procedures) to confirm expected logic level

Signal parameters

  • Interlock continuity: closed (near 0 Ω) when interlock engaged/service plug installed; open (OL) when removed — exact ohms depend on sensor design
  • Signal voltage: typically a low-voltage logic level referenced to chassis or battery (0 V or approx. ignition/reference voltage when active) — manufacturer specific
  • Insulation resistance: high (typically >100 kΩ) from interlock wiring to chassis when intact
  • Diagnostic state: PCM/VCU reports interlock state as CLOSED/OPEN or a fault; expect a stable logic level when healthy

Diagnostic algorithm

  1. Use a scan tool to confirm U352D is present and record freeze-frame/live data; note when fault sets (service plug removed, door open, etc.).
  2. Follow all high-voltage safety procedures. De-energize the HV system and remove the service plug if required before touching HV connectors.
  3. Visually inspect the interlock assembly, service disconnect, and associated connectors for corrosion, damage, moisture, or loose pins.
  4. With the HV system de-energized, check continuity of the interlock circuit from the interlock connector to the HV control module connector. Repair any open or high-resistance runs.
  5. Check for shorts to ground or battery: measure resistance from interlock signal conductor(s) to chassis and to battery positive with power removed. Repair chafed wiring or pin shorts as needed.
  6. Reconnect and, following safety rules, power the vehicle and measure the interlock signal voltage/logic state at the module connector while operating the service plug/interlock. Confirm expected change when engaged/disengaged.
  7. Perform a wiggle test of the harness and connectors while monitoring the live data/scan tool for intermittent faults. Repair or secure routing where movement causes a fault.
  8. If wiring and interlock assembly test good, swap or bench-test the interlock sensor/switch (if serviceable) or replace the interlock assembly. Re-test.
  9. If the interlock assembly and harness are confirmed good, consider module input fault; consult manufacturer module diagnostics before replacing control module.
  10. Clear codes and perform a functional test (operate service plug, power cycle, road test or HV enable sequence) to confirm fault does not recur.

Likely causes

  • Loose or corroded connector at the interlock sensor or service disconnect
  • Damaged harness where it passes through bulkhead or near moving parts
  • Failed interlock switch/pin in the service plug or safety interlock assembly
  • Short to ground caused by chafed insulation
  • Faulty HV control module input (less common)

Fault status

⚠️ Status
High Voltage System Interlock Circuit J: open/short/implausible signal detected. HV enable inhibited until circuit condition is corrected.
🔴 Repair difficulty: Hard
⏱️ Diagnostic time: 1.5-4.0 hours

Similar codes

U352C U352E U3000 U0100 P0A7A
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