What causes B1591 on a Toyota?

Open or short in the MOST communication circuit Loose or corroded MOST connector Damaged MOST harness Failed radio receiver assembly Failed display and navigation module

How do I fix B1591 on a Toyota?

Confirm the code and check the audio system operation Inspect and reseat the MOST connectors Test the MOST communication circuit Check the radio receiver power and ground Replace the failed part only after tests fail

B1591 No response from the audio head unit. The display and navigation module loses MOST communication with the radio receiver

Q: What does B1591 mean on a Toyota?

B1591. No response from the audio head unit. The display and navigation module loses MOST communication with the radio receiver. Applies to Toyota, Lexus and Scion models that use this code.

Category: Body
Severity: Body Warning Light
Applies to: Toyota, Lexus and Scion models that use this code

What does B1591 mean on a Toyota?

B1591. No response from the audio head unit. The display and navigation module loses MOST communication with the radio receiver. This Toyota-enhanced code applies to Toyota, Lexus and Scion models that use this code.

Common causes of B1591

Open or short in the MOST communication circuit
Loose or corroded MOST connector
Damaged MOST harness
Failed radio receiver assembly
Failed display and navigation module

How to fix B1591

Confirm the code and check the audio system operation
Inspect and reseat the MOST connectors
Test the MOST communication circuit
Check the radio receiver power and ground
Replace the failed part only after tests fail