High Voltage Interlock Service

Service or replace the high voltage interlock loop (HVIL) circuit components that monitor the integrity of high voltage connections in the Rivian EDV 500's electric propulsion system.

Warnings

Tools required

Parts

• HVIL circuit connector(s) × 1 — Use OEM specification
• HVIL sensor assembly × 1 — Use OEM specification
• High voltage cable seals × 1 — Use OEM specification
• Cable ties (high voltage rated) × 10 — Use OEM specification

Preparation

1. Park vehicle on level ground in a clean, dry environment with adequate ventilation
2. Place safety cones and warning signs around work area to prevent unauthorized access
3. Ensure vehicle is in Park with parking brake fully engaged
4. Power down vehicle completely using power button - do not just close doors
5. Verify 12V battery is fully charged to maintain vehicle computer systems during service
6. Obtain factory service manual and review specific HVIL circuit diagrams for this vehicle
7. Put on high voltage insulated gloves and safety equipment before beginning work
8. Document current state with photos of all high voltage connections and HVIL routing

Procedure

1. 1

   De-energize high voltage system
   Open the rear cargo area and locate the high voltage service disconnect panel on the driver side. Remove the panel cover. Pull the orange service disconnect handle firmly upward to remove the service plug. Install the lockout device on the service disconnect to prevent reinstallation. Place removed service plug in your pocket or secure location away from the vehicle to maintain positive control.
2. 2

   Wait for capacitor discharge
   Wait a minimum of 15 minutes without touching any high voltage components to allow high voltage capacitors in the drive units and power electronics to fully discharge. Set a timer to ensure full waiting period. Use this time to review service documentation and prepare tools.
3. 3

   Verify system de-energization
   Using a high voltage capable multimeter with insulated test leads, verify zero voltage at the battery service disconnect terminals. Voltage should read 0V DC. Test between positive and negative terminals, then each terminal to vehicle ground. Document voltage readings. If any voltage above 0V is detected, wait additional time and retest.
4. 4

   Access HVIL circuit documentation
   Connect Rivian diagnostic tool to the vehicle OBD-II port. Power on the diagnostic tool and access the HVIL circuit status and diagnostic information. Record all current fault codes related to high voltage interlock. Print or save HVIL circuit routing diagram specific to this vehicle's configuration for reference during service.
5. 5

   Perform initial HVIL continuity test
   Locate the HVIL circuit test connector near the service disconnect area. Using the HVIL continuity tester, verify baseline circuit resistance. A functioning HVIL circuit should show continuity (typically 500-1500 ohms depending on circuit length). Record baseline reading. An open circuit indicates existing HVIL fault requiring diagnosis.
6. 6

   Trace and inspect HVIL circuit routing
   Following the orange high voltage cables from the battery pack, visually inspect every high voltage connector for HVIL circuit integrity. The HVIL consists of small orange wires running parallel to or integrated with high voltage cables. Look for damaged connectors, corroded pins, severed wires, or moisture contamination. Check routing under vehicle, through motor compartments, and to power electronics module.
7. 7

   Inspect high voltage connector seals
   At each high voltage connector location (battery to drive units, drive units to power electronics, charging port), inspect the orange connector housings for proper seal installation. Check for missing, damaged, or improperly seated seals. These seals contain HVIL circuit contacts and environmental protection. Note locations requiring seal replacement.
8. 8

   Test HVIL circuit segments
   Disconnect individual high voltage connector HVIL plugs (small orange connectors separate from main high voltage terminals) one at a time. Test continuity through each segment of the HVIL circuit using the continuity tester. This isolates which circuit segment contains the fault. Work systematically from service disconnect toward each drive unit and charge port. Record resistance values for each segment.
9. 9

   Service or replace faulty HVIL components
   Based on continuity testing, service identified faulty components. If HVIL connector is corroded, carefully clean contacts with electronics contact cleaner and soft brush - do not use abrasives. If HVIL sensor is faulty, disconnect and replace sensor assembly following connector locking tab release procedures. If HVIL circuit wire is damaged, replace entire affected cable assembly - do not splice or repair HVIL wiring.
10. 10

    Reinstall and secure HVIL connections
    Reconnect all HVIL circuit connectors ensuring positive engagement with audible click. Verify connector lock tabs are fully engaged. Install new high voltage cable seals at any locations where seals were disturbed. Ensure orange high voltage cables and integrated HVIL circuits are properly routed away from sharp edges, heat sources, and moving components. Secure cables with new high voltage rated cable ties at factory mounting locations.
11. 11

    Perform post-repair HVIL verification
    With all HVIL connections restored but service disconnect still removed, perform complete HVIL circuit continuity test. Resistance should match baseline specifications (500-1500 ohms typical). Test continuity remains stable while gently moving high voltage cables to verify secure connections. No intermittent opens should occur during movement test.
12. 12

    Reinstall high voltage service disconnect
    Remove lockout device from service disconnect receptacle. Align service disconnect plug with receptacle ensuring correct orientation (keyed connector). Firmly push service disconnect plug straight down until fully seated and handle locks in place. Verify plug is secure and cannot be pulled out without using release handle.
13. 13

    Power up and verify HVIL system operation
    Connect diagnostic tool and clear any old HVIL fault codes. Power on vehicle using power button. Monitor diagnostic tool for HVIL circuit status. Vehicle should complete high voltage system initialization without HVIL faults. If HVIL fault occurs, immediately power down vehicle, remove service disconnect, and repeat diagnosis. Verify propulsion system Ready indicator illuminates confirming high voltage system is operational.
14. 14

    Perform functional system test
    With vehicle in Ready mode, verify all high voltage systems function properly: test forward and reverse propulsion, regenerative braking, climate control (if electric), and DC fast charge capability if accessible. Monitor for any HVIL fault codes during functional testing. Any fault indicates incomplete repair requiring additional diagnosis.

Reassembly

1. Reinstall high voltage service disconnect panel cover ensuring all fasteners are secure
2. Verify all orange high voltage cable covers and protective shrouds are properly installed
3. Remove all tools and equipment from vehicle and surrounding work area
4. Clean work area of any debris that may have accumulated during service

Verification

• Confirm zero HVIL-related fault codes stored in vehicle diagnostic system
• Verify HVIL circuit continuity test shows proper resistance (500-1500 ohms typical)
• Confirm vehicle completes high voltage system initialization and enters Ready mode without errors
• Test drive vehicle to verify normal propulsion system operation with no warning lights or fault messages
• Verify all high voltage connectors are properly sealed and secured with no loose components
• Document completed service with test results, resistance values, and fault code status in service records

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