B1421

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

DTC 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 current from the solar sensor varies according to the amount of sunlight. When the sunlight increases, the output current increases. As the sunlight decreases, the output current decreases. The A/C amplifier detects output current 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 power 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.
CHECK WIRE HARNESS (SOLAR SENSOR)




(a) Disconnect the L1 solar sensor connector.
(b) Measure the resistance of the wire harness side connector.
Standard resistance:





(c) Measure the voltage of the wire harness side connector.
Standard voltage:






OK -- CHECK WIRE HARNESS (SOLAR SENSOR - A/C AMPLIFIER)
NG -- Continue to next step.
3.
CHECK WIRE HARNESS (MAIN BODY ECU RH - SOLAR SENSOR)




(a) Disconnect the K67 and DD main body ECU RH connectors.
(b) Disconnect the L1 solar sensor connector.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE MAIN BODY ECU RH
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 OR CONNECTOR
OK -- Continue to next step.
5.
CHECK SOLAR SENSOR (TSR VOLTAGE)




(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:





HINT:
- As the inspection light is moved away from the sensor, the voltage decreases.
- 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