"P" Position Switch Indicator Light Circuit: Procedure

1. Turn the power switch on (IG).
2. Depress the brake pedal and move the shift lever to select neutral (N).
3. Inspect the indicator light condition by operating the P position switch (transmission shift main switch).

   Result

   Condition of Indicator Light	Proceed to
   Indicator light does not go off. (Remains on)	A
   Indicator light does not come on.	B

4. Turn the power switch off.

B → See step   4 

A: Go to next step 

1. Disconnect the A23 transmission control ECU assembly connector.
2. Turn the power switch on (IG).
3. Inspect the indicator light condition by operating the P position switch (transmission shift main switch).

   Result

   Condition of Indicator Light	Proceed to
   Indicator light does not go off. (Remains on)	A
   Indicator light goes off.	B

   NOTE:

   Turning the power switch on (IG) with the transmission control ECU assembly connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

4. Turn the power switch off.
5. Connect the A23 transmission control ECU assembly connector.

B → See step   7 

A: Go to next step 

1. Disconnect the A23 transmission control ECU assembly connector.
2. Disconnect the b1 P position switch (transmission shift main switch) connector.
3. Measure the resistance according to the value(s) in the table below.
   Fig 1: Checking A23 & b1 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance (Check for Short)

   Tester Connection	Condition	Specified Condition
   A23-20 (IND) or b1-7 (IND-) - Body ground and other terminals	Power switch off	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Transmission Control ECU Assembly)
   *b	Front view of wire harness connector (to P Position Switch (Transmission Shift Main Switch))

4. Connect the b1 P position switch (transmission shift main switch) connector.
5. Connect the A23 transmission control ECU assembly connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → REPLACE P POSITION SWITCH (TRANSMISSION SHIFT MAIN SWITCH) 

1. Disconnect the b1 P position switch (transmission shift main switch) connector.
2. Measure the voltage according to the value(s) in the table below.
   Fig 2: Checking b1 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   b1-6 (IND+) - Body ground	Power switch off	9 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to P Position Switch (Transmission Shift Main Switch))

3. Connect the b1 P position switch (transmission shift main switch) connector.

NG → CHECK AND REPAIR POWER SOURCE CIRCUIT 

OK: Go to next step 

1. Disconnect the b1 P position switch (transmission shift main switch) connector.
2. Apply auxiliary battery voltage between terminals b1-6 (IND+) and b1-7 (IND-) and check the indicator light.
   Fig 3: Inspecting b1 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Result

   Condition	Specified Condition
   Auxiliary battery voltage applied between terminals b1-6 (IND+) and b1-7 (IND-)	Comes on

   TEXT IN ILLUSTRATION
   
   

   *a	Component without harness connected (P Position Switch (Transmission Shift Main Switch))

   HINT: 

   Terminals No. 1 and No. 8 on the component side connector are empty.

3. Connect the b1 P position switch (transmission shift main switch) connector.

NG → REPLACE P POSITION SWITCH (TRANSMISSION SHIFT MAIN SWITCH) 

OK: Go to next step 

1. Disconnect the A23 transmission control ECU assembly connector.
2. Disconnect the b1 P position switch (transmission shift main switch) connector.
3. Measure the resistance according to the value(s) in the table below.
   Fig 4: Checking A23 & b1 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance (Check for Open)

   Tester Connection	Condition	Specified Condition
   A23-20 (IND) - b1-7 (IND-)	Power switch off	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Transmission Control ECU Assembly)
   *b	Front view of wire harness connector (to P Position Switch (Transmission Shift Main Switch))

4. Connect the b1 P position switch (transmission shift main switch) connector.
5. Connect the A23 transmission control ECU assembly connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   7