DTC B1421/21: Solar Sensor Circuit (Passenger Side): Procedure

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the Techstream on.
4. Expose the sensing portion of the solar sensor to light.

   HINT: 

   Use an incandescent light for inspection.

5. Enter the following menus: Body / Air Conditioner / Data List.
6. 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

C → See step   5 

B → See step   4 

A: Go to next step 

1. Disconnect the connector from the solar sensor.
   Fig 1: Identifying F1 Connector SS+ & SS- Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. 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-)	Ignition switch off	Below 1 V
   F1-1 (SS+) - F1-2 (SS-)	Ignition switch ON	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Solar Sensor)

NG → See step   3 

OK → See step   6 

1. Disconnect the connector from the A/C amplifier.
2. 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-)	Always	Below 1 Ω
   E30-31 (S5-4) - F1-1 (SS+)	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

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   5