EV System Reset/Calibration

This procedure performs a complete EV system reset and calibration for the Rivian EDV 500, including high voltage system power cycle, sensor recalibration, and diagnostic verification to restore proper vehicle operation.

Warnings

Tools required

Parts

• High voltage connector seals × 2 — Use OEM specification
• Service plug retention clip × 1 — Use OEM specification

Preparation

1. Park vehicle on level ground in well-ventilated area away from flammable materials
2. Ensure vehicle is in Park with parking brake fully engaged
3. Verify 12V battery is fully charged (12.6V or higher at rest)
4. Connect 12V battery maintainer to prevent voltage drop during procedure
5. Verify you have current Rivian software version and vehicle-specific calibration files
6. Document all existing fault codes before beginning work
7. Allow high voltage system to cool for minimum 30 minutes if vehicle was recently driven
8. Put on high voltage safety gloves and ensure no jewelry or conductive items are worn

Procedure

1. 1

   Connect Diagnostic Equipment
   Connect laptop with Rivian diagnostic software to OBD-II port located under driver side dashboard. Launch software and establish communication with all vehicle modules. Verify communication with battery management system, motor control units (front and rear), and vehicle control module. Save baseline snapshot of all system parameters.
2. 2

   Perform Pre-Reset System Check
   Using diagnostic software, check status of all high voltage components including battery pack state of charge (should be 20-80% for calibration), battery cell balance status, motor insulation resistance, and DC-DC converter operation. Document any faults or abnormal readings. Verify cooling system is functioning properly with no leaks or low fluid warnings.
3. 3

   Disable High Voltage System
   Through diagnostic software, command vehicle to safe mode. Open rear cargo area and remove service panel on driver side to access high voltage service disconnect. Using HV disconnect tool, remove service plug by rotating counterclockwise 90 degrees and pulling straight out. Store service plug in designated storage location away from vehicle. Wait 5 minutes for high voltage capacitors to discharge.
4. 4

   Verify Zero Voltage
   Using high voltage rated multimeter, verify zero voltage at service disconnect location. Measure across both positive and negative bus bars to vehicle ground. All readings must be below 5V DC. If voltage is present, wait additional 5 minutes and retest. Do not proceed until voltage is confirmed at safe levels.
5. 5

   Inspect High Voltage Connections
   With system confirmed de-energized, visually inspect all accessible high voltage connectors (orange cables) for damage, corrosion, or contamination. Check service disconnect connector for debris or moisture. Inspect battery pack ventilation ports and cooling system connections. Clean any contaminants with approved electrical contact cleaner.
6. 6

   Reinitialize High Voltage System
   Reinstall high voltage service plug by aligning key slot and rotating clockwise 90 degrees until fully seated. Install new retention clip to secure. Close service panel. Return to diagnostic software and command system to wake from safe mode. Monitor for proper high voltage system initialization sequence. Verify battery management system reports normal status.
7. 7

   Clear Stored Fault Codes
   Using diagnostic software, clear all stored diagnostic trouble codes from all modules. This includes battery management system, both motor control units, vehicle control module, and auxiliary systems. Confirm all modules report no active or pending codes after clearing operation.
8. 8

   Perform Battery Management System Calibration
   Navigate to BMS calibration menu in diagnostic software. Initiate cell balancing calibration routine which will measure individual cell voltages and update balance parameters. This process takes 15-20 minutes. Monitor progress and ensure no cells show voltage deviation greater than 30mV. If deviation exceeds specification, repeat calibration or investigate for weak cells.
9. 9

   Calibrate Motor Position Sensors
   With vehicle in Park and wheels chocked, access motor calibration menu for front motor. Command resolver/encoder calibration sequence which will rotate motor through full electrical cycles at low speed. Repeat for rear motor. Software will learn and store motor position sensor zero points and phase alignment. Verify calibration success confirmation message for both motors.
10. 10

    Reset Torque Vectoring System
    Access AWD torque vectoring calibration menu. Command system reset which will zero all learned torque distribution parameters and reestablish baseline. This prepares system for adaptive learning during test drive. Verify both front and rear drive units respond correctly to torque commands through diagnostic software test functions.
11. 11

    Calibrate Regenerative Braking
    Navigate to regenerative braking calibration section. Command regen system calibration which coordinates battery acceptance parameters, motor capabilities, and brake blending. System will verify maximum regen power limits based on current battery temperature and state of charge. Confirm calibration values are within normal range per service manual specifications.
12. 12

    Reset Vehicle Control Module Adaptive Parameters
    Access VCM adaptive parameters menu and command full reset. This clears all learned driving behavior, efficiency calculations, and range estimation algorithms. System will relearn these parameters during normal driving. Verify VCM reports successful parameter reset and enters learn mode.
13. 13

    Perform Steering Angle Sensor Calibration
    With vehicle stationary and wheels pointed straight ahead, access steering angle sensor calibration. Command zero point calibration. Turn steering wheel lock to lock (both directions) slowly while monitoring sensor output on diagnostic screen. Return wheels to center and confirm calibration. Verify steering angle reads 0 degrees ±2 degrees when wheels are straight.
14. 14

    Complete System Verification
    Run complete vehicle system diagnostic scan. Verify all modules communicate properly and report ready status. Check that no fault codes are present. Review all calibrated parameters to confirm values are within specification. Generate calibration report and save to vehicle history file. Disconnect diagnostic equipment.

Reassembly

1. Ensure all high voltage service panels are properly secured with all fasteners installed
2. Verify service disconnect retention clip is properly engaged
3. Remove 12V battery maintainer and verify battery voltage remains above 12.4V
4. Ensure no tools or equipment remain in vehicle or near high voltage components

Verification

• Turn vehicle on and verify dash displays no warning lights related to high voltage system, motors, or battery
• Check that propulsion system ready indicator illuminates normally
• Verify estimated range display appears reasonable based on current state of charge
• Test regenerative braking in both low and high modes at low speed in safe area - should feel smooth with no jerking
• Perform test drive covering minimum 10 miles including various speeds and acceleration rates
• During test drive verify smooth power delivery, proper AWD engagement, and normal regenerative braking operation
• After test drive, perform final diagnostic scan to confirm no new fault codes generated
• Verify torque vectoring system engages properly during cornering with smooth power distribution
• Check that battery thermal management system operates normally with coolant circulating as needed
• Document final calibration status and update vehicle service records with software version and calibration date

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