High Voltage Interlock Service

Service and test the high voltage interlock loop (HVIL) system to ensure proper functionality and safety of the high voltage battery system in the Rivian EDV 500.

Warnings

Tools required

Parts

• HVIL connector seals (if damaged) × 1 — Use OEM specification
• HVIL sensing wire assembly (if damaged) × 1 — Use OEM specification
• High voltage warning labels (if damaged) × 1 — Use OEM specification

Preparation

1. Park vehicle on level surface and apply parking brake
2. Place safety cones and warning signs around work area to prevent unauthorized access
3. Ensure 12V battery is fully charged as multiple system tests will be required
4. Put on insulated high voltage safety gloves before beginning any work
5. Remove driver and passenger floor mats to access interior components
6. Ensure ambient temperature is between 50-90°F for accurate resistance measurements
7. Review vehicle service history for any previous high voltage system faults
8. Have emergency response guide and fire suppression equipment readily available

Procedure

1. 1

   Connect diagnostic tool and document baseline
   Connect the Rivian diagnostic scan tool to the OBD-II port located under the driver side dash. Power on the tool and establish communication with the vehicle. Navigate to the high voltage system module and capture all current and stored fault codes. Take screenshots or written notes of HVIL circuit status, voltage readings, and any active warnings. Check for any history of HVIL interruption events.
2. 2

   Disable high voltage system
   Using the diagnostic scan tool, navigate to Service Functions and select 'HV System Disable' or 'Manual Service Disconnect'. Follow all on-screen prompts to safely disable the high voltage battery system. Verify that the HV system status shows 'Disabled' or 'Service Mode Active'. Alternatively, if diagnostic disable is unavailable, proceed to physically disconnect the manual service disconnect under the hood. Wait a minimum of 5 minutes after disable command for capacitors to discharge.
3. 3

   Verify high voltage system de-energization
   With high voltage gloves still on, use a high voltage capable multimeter to verify the HV battery terminals show 0V DC. Test between HV+ and HV- terminals at the battery pack access points. Also verify 0V between each HV terminal and vehicle chassis ground. Only proceed when confirmed zero voltage readings are obtained. Document all voltage readings.
4. 4

   Access and inspect underhood HVIL connections
   Open the hood and locate the high voltage junction box (orange-colored housing on driver side). Identify all HVIL connector loops - these are small signal wires integrated into the high voltage connector assemblies. Visually inspect each orange HV connector for physical damage, corrosion, moisture intrusion, or damaged locking mechanisms. Pay special attention to connector seals and the small HVIL sense pins within each connector.
5. 5

   Inspect battery pack HVIL connections
   Raise the vehicle on a lift if necessary to access the underbody battery pack connectors. Locate the main battery disconnect and inverter connection points. Inspect HVIL connectors at the battery pack interface, looking for any signs of damage, corrosion, wire chafing, or moisture. Check that all connector locks are fully engaged and orange safety covers are in place.
6. 6

   Test HVIL circuit continuity
   Using the HVIL circuit tester or multimeter in ohm mode, disconnect the HVIL loop at a service access point (typically at the high voltage junction box). Measure resistance through the complete HVIL circuit. Proper reading should be 1000-3000 ohms (verify exact specification in service manual). An open circuit (infinite resistance) indicates a break in the HVIL loop. A very low resistance may indicate a short or damaged sense resistor.
7. 7

   Inspect cabin HVIL routing
   Remove the driver side lower dash panel to access the HVIL wiring harness routing from the battery pack forward to the motor drive units. Inspect the HVIL sense wiring where it passes through the cabin firewall and along the underbody. Look for pinched wires, damaged insulation, improper routing, or any modifications. Verify all cable ties and retaining clips are intact and wires are not touching sharp edges.
8. 8

   Test individual HVIL connector segments
   Systematically disconnect and reconnect each high voltage connector while monitoring HVIL circuit resistance. This isolates which connector or circuit segment may have an issue. At each connector, verify the HVIL sense pins are not damaged, retracted, or corroded. Clean any minor corrosion with electrical contact cleaner and apply dielectric grease to pins before reconnection. Ensure each connector fully seats with an audible click.
9. 9

   Inspect charge port HVIL circuit
   Open the charge port door and inspect the charge inlet connector assembly. The HVIL circuit includes the charge port interlock. Check for any damage, foreign objects, or moisture in the charge port. Verify the charge port locking mechanism operates smoothly. Test HVIL continuity with a charging cable disconnected and again with a dummy charge connector if available.
10. 10

    Clean and service HVIL connections
    For any connectors showing corrosion or contamination, carefully disconnect (maintaining HV safety protocols), clean the HVIL sense pins with electrical contact cleaner, and allow to fully dry. Apply a thin coat of dielectric grease to HVIL connector pins and sealing surfaces. Replace any damaged connector seals or boots. Ensure all connections are clean, dry, and properly sealed before reconnection.
11. 11

    Reconnect and verify HVIL circuit integrity
    Ensure all high voltage connectors are fully seated and locked. All orange safety covers must be installed. Measure final HVIL circuit resistance and verify it falls within specification (typically 1000-3000 ohms, confirm with service data). Document the final resistance reading. Verify no visible damage or concerns remain in the HVIL circuit path.
12. 12

    Re-enable high voltage system
    Using the diagnostic scan tool, navigate to Service Functions and select 'HV System Enable' or 'Exit Service Mode'. If manual service disconnect was used, ensure it is properly reinstalled and locked. Follow all prompts on the scan tool. The vehicle will perform a self-test of the HVIL circuit. Monitor for any fault codes during the enable process. The HV system should show 'Ready' status when complete.
13. 13

    Perform HVIL system function test
    With the diagnostic tool connected, perform a complete HVIL system test using the scan tool's built-in test functions. This will command the HV contactors closed and verify HVIL continuity under system operation. Verify the test passes with no faults. Additionally, intentionally disconnect one HV connector (following safety protocols) to verify the HVIL circuit properly detects the interruption and disables the HV system as designed.
14. 14

    Clear fault codes and verify operation
    Clear all diagnostic trouble codes related to the HVIL service performed. Cycle the vehicle to READY mode and verify no new codes are set. Check that the high voltage system status shows normal operation. Verify battery voltage displays correctly and no warning lights are present on the instrument cluster. Test drive the vehicle briefly to confirm normal propulsion operation.

Reassembly

1. Reinstall all interior trim panels and floor mats removed during service
2. Verify all high voltage connector orange safety covers are installed
3. Ensure all cable ties and harness retaining clips are properly secured
4. Close hood and charge port door, verifying proper operation
5. Remove safety cones and warning signs from work area

Verification

• Verify HVIL circuit resistance is within specification (typically 1000-3000 ohms)
• Confirm no high voltage system fault codes are present using diagnostic tool
• Verify vehicle enters READY mode without warnings or errors
• Confirm high voltage system status shows normal operation on scan tool
• Test that intentional HVIL interruption properly disables HV system
• Verify all high voltage connectors are fully seated with orange covers installed
• Confirm normal vehicle acceleration and regenerative braking operation
• Document all test results and resistance measurements in service records

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