B1421

AIR CONDITIONING: AIR CONDITIONING SYSTEM: B1421/21: Solar Sensor Circuit (Passenger Side)

DTC B1421/21 - Solar Sensor Circuit (Passenger Side)

DESCRIPTION





A photo diode in the automatic light control sensor detects solar radiation and sends appropriate signals to the A/C amplifier.
HINT: When DTC B1421/21 is displayed simultaneously with DTC B1244, repair the malfunction indicated by DTC B1244 first.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING TECHSTREAM (SOLAR SENSOR (PASSENGER SIDE))
(a) Check the Data List for proper functioning of the solar sensor.

Air Conditioner





OK:
The display is as specified in the normal condition.

Result





C -- REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY
B -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
A -- Continue to next step.
2. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY (TSPa VOLTAGE)




(a) Remove the amplifier but do not disconnect the connector.
(b) Turn the ignition switch ON.
(c) Measure the voltage of the connector.
Standard voltage:





HINT:
- Use an incandescent light for the inspection. Bring it within 30 cm (11.8 in.) of the solar sensor.
- The voltage will increase when the light is moved closer to the sensor.

Result





C -- REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY
B -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
A -- Continue to next step.
3. CHECK WIRE HARNESS (AUTOMATIC LIGHT CONTROL SENSOR - A/C AMPLIFIER AND BODY GROUND)




(a) Disconnect the A26 sensor connector.
(b) Disconnect the A9 amplifier connector.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
4. CHECK FOR DTC
(a) Disconnect the A26 sensor connector.
(b) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.

Result





B -- REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY
A -- REPLACE AUTOMATIC LIGHT CONTROL SENSOR