B1236 Open in the Passenger Side Air Mix Control Motor Circuit

Definition: This diagnostic trouble code (DTC) indicates an open circuit in the passenger side air mix control motor, which is responsible for regulating the blend of hot and cold air on the passenger side of a vehicle’s HVAC system.

B1236: Open in the passenger side air mix control motor circuit
Severity: Moderate

Common Causes

B1236 – Open in Passenger Side Air Mix Control Motor Circuit

Description: This code indicates that there is an open circuit detected in the passenger side air mix control motor circuit.

Common Causes:

• Faulty passenger side air mix control motor
• Wiring or connector issues in the air mix control motor circuit
• Blown fuse related to the air mix control system
• Issues with the HVAC control module

Common Misdiagnosis

OBD2 Code: B1236

Description: Open in the passenger side air mix control motor circuit

Common Misdiagnosis: Faulty air mix control motor is often misdiagnosed as a problem with the HVAC control module or wiring harness issues.

Common Diagnostic Steps

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OBD2 Code: B1236

Description: Open in the Passenger Side Air Mix Control Motor Circuit

Common Diagnostic Steps:

• Verify the code using an OBD-II scanner.
• Inspect the passenger side air mix control motor for any visible damage or disconnection.
• Check the wiring and connectors between the HVAC control module and the air mix control motor for continuity, corrosion, or damage.
• Test the voltage supply to ensure it is within specifications at the air mix control motor connector.
• Use a multimeter to check for an open circuit in the wiring harness related to the air mix control motor circuit.
• If equipped, use a scan tool to perform an actuator test on the air mix control motor to verify its operation.
• Replace or repair any faulty components as necessary based on diagnostic findings.
• Clear codes and retest system functionality after repairs are completed.