DTC B1509: Open in Ambient Temperature Sensor Circuit: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Combination Meter / Data List.
5. According to the display on the Techstream, read the Data List.
   COMBINATION METER
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Ambient Temperature	Thermistor assembly / Min: -40.0°C (-40.0°F) Max: 87.5°C (189.5°F)	Actual ambient temperature displayed	Open in the circuit: -40.0°C (-40.0°F) Short in the circuit: 87.5°C (189.5°F)

   OK

   The display is as specified in the normal condition column.

   RESULT
   
   

   Result	Proceed to
   OK (When troubleshooting according to the DTC)	A
   OK (When troubleshooting according to problem symptoms table)	B
   NG	C

B → See step   6 

C → See step   3 

A: Go to next step 

1. Clear the DTCs. Refer to DTC CHECK / CLEAR [03/2012 - ] .
2. Check for DTCs. Refer to DTC CHECK / CLEAR [03/2012 - ] .

   OK

   DTC B1509 is not output

NG → See step   7 

OK → END 

1. Remove the thermistor assembly. Refer to REMOVAL [03/2012 - ] .
2. Inspect the thermistor assembly. Refer to INSPECTION [03/2012 - ] .

NG → See step   5 

OK: Go to next step 

1. Disconnect the A48 thermistor assembly connector.
2. Disconnect the D7 combination meter assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance (Check for Open)

   Tester Connection	Condition	Specified Condition
   A48-1 - D7-24 (TAM)	Always	Below 1 Ω
   A48-2 - D7-25 (SG-)	Always	Below 1 Ω

   Standard Resistance (Check for Short)

   Tester Connection	Condition	Specified Condition
   A48-1 - Body ground	Always	10 kΩ or higher
   A48-2 - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   8