← View Generic B0604 Guide Severity: Medium
🚗 Vehicle-Specific Guide

This guide is customized for your 2021 Honda PASSPORT

B0604: B0604: Seat Switch Circuit Malfunction

on 2021 Honda PASSPORT

Fix Cost
$100 - $500
Parts & Labor
Difficulty
3/5
1-2 hours
DIY Possible?
❌ No
Pro recommended
Your Vehicle
2021 Honda
PASSPORT
⚠️

Important for 2021 Honda PASSPORT Owners

Before starting repairs, verify which engine your 2021 Honda PASSPORT has. Check your VIN or engine code to ensure you order the correct parts.

📖 What Does B0604 Mean on 2021 Honda PASSPORT?

The B0604 code indicates a malfunction in the seat switch circuit, which controls the seat's position, lumbar support, and recline functions.
⚠️

Symptoms

  • • Seat position not functioning correctly
  • • lumbar support not adjusting
  • • recline function not working
  • • unusual seat behavior
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Common Causes

  • • Faulty seat switch
  • • wiring issue
  • • seat motor malfunction
  • • faulty seat control module
🛠️

How to Fix B0604 on 2021 Honda PASSPORT

1. Disconnect the battery to reset the system. 2. Check and clean the seat switch contacts. 3. Replace the faulty seat switch. 4. Check and repair any wiring issues. 5. Replace the seat motor if necessary. 6. Update the seat control module's software if necessary.

🔧

Need Maintenance Info for Your PASSPORT?

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Parts for 2021 Honda PASSPORT

Seat switch Shop ↗ Wiring harness Shop ↗ Seat motor Shop ↗ Seat control module Shop ↗

Essential Tool

Must Have

OBD2 Scanner

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Related Diagnostic Codes

Other codes that may appear with B0604

B0602 Sequential Code

B0602: Door Locks Malfunction

Medium
B0603 Sequential Code

B0603: Power Window Circuit Malfunction

Medium
B0605 Sequential Code

B0605: Body System Code - Lighting Malfunction

Medium
B0606 Sequential Code

B0606: Immobilizer System Malfunction

High

💡 Why These Codes Are Related:

  • • Similar Issues: Same root cause or component failure
  • • Related Problems: Often occur together due to system interactions
  • • Sequential Codes: Progressive failure stages or multiple sensors
  • • Same System: Components within the same automotive system