Air Conditioning System

DTC B1492/92 Infrared Rays Sensor Communication Malfunction

DESCRIPTION

DTC Detection Condition:

This circuit consists of the infrared ray sensor and the air conditioning amplifier. The infrared ray sensor, which is installed on the rear roof, detects human body temperature and control the heater and air conditioner "AUTO" mode in 4 zones. Signals are transmitted to the air conditioning amplifier via the LIN communication line. This DTC is output when communication between the infrared ray sensor and the air conditioning amplifier stops for 10 seconds or more. If the LIN communication system malfunctions, the air conditioning amplifier does not operate even if the infrared ray sensor is normal.

Wiring Diagram:

Step 1-2:

Step 2 (Continued):

INSPECTION PROCEDURE