Solar Sensor Circuit (Passenger Side) - Air Conditioning System

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

DESCRIPTION





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 output voltage from the solar sensor.





HINT
If DTC B1224 is output at the same time, troubleshoot DTC B1224 first.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Select the item below in the Data List, and read the display on the Techstream.

Data List / Air Conditioner:





OK:

The display is as specified in the normal condition.

Result:





C -- REPLACE AIR CONDITIONING AMPLIFIER

B -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
A -- Continue to next step.

2. INSPECT MULTIPLEX NETWORK BODY ECU





(a) Remove the cowl side junction block RH with its connectors still connected.

(b) Measure the resistance of the multiplex network body ECU.

Standard resistance:





(c) Measure the voltage of the multiplex network body ECU.

Standard voltage:





NG -- REPLACE MULTIPLEX NETWORK BODY ECU
OK -- Continue to next step.

3. CHECK WIRE HARNESS (SOLAR SENSOR - MULTIPLEX NETWORK BODY ECU)





(a) Disconnect the L1 solar sensor connector.

(b) Measure the resistance of the wire harness side connectors.

Standard resistance:





(c) Measure the voltage of the wire harness side connectors.

Standard voltage:





NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.

4. CHECK WIRE HARNESS (SOLAR SENSOR - A/C AMPLIFIER)





(a) Disconnect the L1 solar sensor connector.

(b) Disconnect the K52 A/C amplifier connector.

(c) Measure the resistance of the wire harness side connectors.

Standard resistance:





NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.

5. CHECK SOLAR SENSOR





(a) Remove the solar sensor with its connector still connected.

(b) Apply battery voltage between terminals 6 (CLTB) and 3 (CLTE) of the solar sensor.

(c) Measure the voltage of the sensor.

Standard voltage:





NOTICE:
* As the inspection light is moved away from the sensor, the voltage increases.
* Use an incandescent light for inspection. Bring it about 30 cm (11.8 in.) from the solar sensor.
NG -- REPLACE SOLAR SENSOR

OK -- REPLACE AIR CONDITIONING AMPLIFIER