Dtc B1421/21 Solar Sensor Circuit (Passenger Side)

Vehicle Interior. Corolla. Zre142 Aze141
Heating Air Conditioning. Corolla. Zre142 Aze141

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING TECHSTREAM

CHECK HARNESS AND CONNECTOR (SOLAR SENSOR)

CHECK HARNESS AND CONNECTOR (SOLAR SENSOR - A/C AMPLIFIER)

DTC B1421/21 Solar Sensor Circuit (Passenger Side)


DESCRIPTION

Corolla. Zre142 Aze141.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System). Dtc B1421/21 Solar Sensor Circuit (Passenger Side)
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.

DTC No.
DTC Detection Condition
Trouble Area
B1421/21
Open or short in passenger side solar sensor circuit
  1. Solar sensor
  2. Harness or connector between solar sensor and A/C amplifier
  3. A/C amplifier

WIRING DIAGRAM


Corolla. Zre142 Aze141.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System). Dtc B1421/21 Solar Sensor Circuit (Passenger Side)


INSPECTION PROCEDURE

HINT:
If the check is performed in a dark place, DTC B1421/21 (solar sensor circuit abnormal) may be output even though the system is normal.
1.READ VALUE USING TECHSTREAM

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the Techstream on.

  1. Expose the sensing portion of the solar sensor to light.

    HINT:
    Use an incandescent light for inspection.

  1. Enter the following menus: Body Electrical / Air Conditioner / Data List.

  1. Check the value(s) by referring to the table below.

    Air Conditioner
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    Solar Sensor (D side)
    (Solar Sens-D)
    		Driver side solar sensor / Min.: 0, Max.: 255
    		Driver side solar sensor value increases as brightness increases
    		-
    OK:
    The display is as specified in the "Normal Condition" column.

    Result:

    Result
    		Proceed to
    NG
    		A
    OK (When troubleshooting according to Problem Symptoms Table)
    		B
    OK (When troubleshooting according to DTC)
    		C


B
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (COROLLA_ZRE142 RM000001M2W05OX.html)

C
REPLACE AIR CONDITIONING AMPLIFIER (COROLLA_ZRE142 RM000002XMC01VX.html)
A


2.CHECK HARNESS AND CONNECTOR (SOLAR SENSOR)


    Corolla. Zre142 Aze141.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System). Dtc B1421/21 Solar Sensor Circuit (Passenger Side)

  1. Disconnect the connector from the solar sensor.

  1. Measure the voltage according to the value(s) in the table below.

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    F1-1 (SS+) - F1-2 (SS-) *A
    		Ignition switch off
    		Below 1 V
    F1-1 (SS+) - F1-2 (SS-) *A
    		Ignition switch ON
    		11 to 14 V
    b1-1 (SS+) - b1-2 (SS-) *B
    		Ignition switch off
    		Below 1 V
    b1-1 (SS+) - b1-2 (SS-) *B
    		Ignition switch ON
    		11 to 14 V
    Text in Illustration
    *A
    		for TMC Made
    *B
    		Except TMC Made
    *a
    		Front view of wire harness connector
    (to Solar Sensor)


NG
Go to step 3
OK

REPLACE SOLAR SENSOR (COROLLA_ZRE142 RM000001WID04TX.html)

3.CHECK HARNESS AND CONNECTOR (SOLAR SENSOR - A/C AMPLIFIER)

  1. Disconnect the connector from the A/C amplifier.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E30-33 (TS) - F1-2 (SS-) *A
    		Always
    		Below 1 Ω
    E30-31 (S5-4) - F1-1 (SS+) *A
    		Always
    		Below 1 Ω
    E30-33 (TS) - b1-2 (SS-) *B
    		Always
    		Below 1 Ω
    E30-31 (S5-4) - b1-1 (SS+) *B
    		Always
    		Below 1 Ω
    E30-33 (TS) - Body ground
    		Always
    		10 kΩ or higher
    E30-31 (S5-4) - Body ground
    		Always
    		10 kΩ or higher
Text in Illustration
*A
for TMC Made
*B
Except TMC Made


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE AIR CONDITIONING AMPLIFIER (COROLLA_ZRE142 RM000002XMC01VX.html)