DTC P0703-12: Brake Switch "B" Circuit Short to Battery [10/2014 - ]: Procedure

HINT: 

Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals may be discovered before parts or wiring is disturbed. Reading the Data List information early in troubleshooting is one way to save diagnostic time.

1. Turn the engine switch off.
2. Connect the Techstream to the DLC3.
3. Turn the engine switch on (IG).
4. Turn the Techstream on.
5. Enter the following menus: Powertrain / Transmission / Data List.
6. According to the display on the Techstream, read the Data List.

   Powertrain > Transmission > Data List 

   Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
   Stop Light SW	Stop light switch status	ON or OFF	ON: Brake pedal depressed OFF: Brake pedal released	-

   Powertrain > Transmission > Data List 

   Tester Display
   Stop Light SW

   OK

   On the Techstream screen, ON or OFF is displayed accordingly.

   NOTE:

   In the table above, the conditions listed under "Normal Condition" are reference conditions. Do not depend solely on these reference conditions when deciding whether a part is faulty.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

CHECK FOR INTERMITTENT PROBLEMS. Refer to  ELECTRONIC CIRCUIT INSPECTION PROCEDURE [10/2014 - ] 

Result: 

NG 

See step  2

1. Check the stop light switch assembly installation.

   Refer to INSTALLATION [10/2014 - 09/2016] , or refer to INSTALLATION [09/2016 - ]

   OK

   Stop light switch assembly is installed correctly.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

SECURELY REINSTALL STOP LIGHT SWITCH ASSEMBLY. Refer to  INSTALLATION [10/2014 - 09/2016]  , or refer to  INSTALLATION [09/2016 - ] 

Result: 

OK 

See step  3

1. Disconnect the A1 stop light switch connector.
2. Disconnect the A35 ECM connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A1-2 (L) or A35-9 (STP) - Other terminals	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

1. Check the stop light switch assembly.

   Refer to ON-VEHICLE INSPECTION [10/2014 - ]

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE ECM. Refer to  REMOVAL [10/2014 - 05/2019]  , or refer to  REMOVAL [05/2019 - ] 

Result: 

NG 

REPLACE STOP LIGHT SWITCH ASSEMBLY. Refer to  REMOVAL [10/2014 - 09/2016]  , or refer to  REMOVAL [09/2016 - ]