DTC P0504: Brake Switch "A" / "B" Correlation [09/2014 - 10/2015]: Procedure

1. Disconnect the stop light switch assembly connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A5-1 (B) - Body ground	Always	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Stop Light Switch Assembly)

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - BATTERY) 

Result: 

OK 

See step  2

1. Disconnect the stop light switch assembly connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Turn the engine switch on (IG).
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   A5-5 (B) - Body ground	Engine switch on (IG)	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Stop Light Switch Assembly)

Result: 

NG 

See step  6

Result: 

OK 

See step  3

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A5-3 (GND) - Body ground	Always	Below 1 Ω

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

1. Turn the engine switch on (IG).

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A19-12 (ST1-) - Body ground	Brake pedal released	7.5 to 14 V
   	Brake pedal depressed	Below 1.5 V
   A19-13 (STP) - Body ground	Brake pedal released	Below 1.5 V
   	Brake pedal depressed	7.5 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *a	Brake Pedal Depressed	*b	Brake Pedal Released
   *c	Component with harness connected (ECM)	-	-

Result: 

OK 

REPLACE ECM 

(Refer to REMOVAL [09/2014 - 10/2015] )

Result: 

NG 

See step  5

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A5-2 (L) - A19-13 (STP)	Always	Below 1 Ω
   A5-4 (L) - A19-12 (ST1-)	Always	Below 1 Ω
   A5-2 (L) or A19-13 (STP) - Body ground	Always	10 kΩ or higher
   A5-4 (L) or A19-12 (ST1-) - Body ground	Always	10 kΩ or higher

Result: 

OK 

REPLACE STOP LIGHT SWITCH ASSEMBLY 

(Refer to REMOVAL [09/2014 - ] )

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Remove the No. 1 integration relay from the No. 2 engine room relay block.
2. Disconnect the stop light switch assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A5-5 (B) - 2F-6	Always	Below 1 Ω
   A5-5 (B) or 2F-6 - Body ground	Always	10 kΩ or higher

Result: 

OK 

GO TO ECM POWER SOURCE CIRCUIT 

(Refer to ECM Power Source Circuit [09/2014 - 10/2015] )

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR