DTC 21

DTC B1421/21 Solar Sensor Circuit (Passenger Side)

DESCRIPTION

DTC Detection Condition:

The solar sensor, which is installed on the upper side of the instrument panel, detects sunlight and controls the air conditioning in AUTO mode. The output voltage from the solar sensor varies according to the amount of sunlight. When the sunlight increases, the output voltage increases. As the sunlight decreases, the output voltage decreases. The A/C amplifier detects voltage output from the solar sensor.

Wiring Diagram:

Step 1:

Step 1 (Continued)-3:

Step 3 (Continued)-4:

Step 4 (Continued)-5:

INSPECTION PROCEDURE

HINT:
- If DTC B1244 is output at the same time, troubleshoot DTC B1244 first.
- If the check is performed in a dark place, DTC B1421/21 or B1424/24 (solar sensor circuit abnormal) may be output even though the system is normal.