DTC C1249/49: Open in Stop Light Switch Circuit: Procedure

1. Check that the stop lights come on when the brake pedal is depressed, and go off when the brake pedal is released.

   OK

   Condition	Illumination Condition
   Brake pedal depressed	ON
   Brake pedal released	OFF

NG → See step   6 

OK: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Select the Data List mode on the Techstream. Refer to DATA LIST / ACTIVE TEST .
   DATA LIST
   
   

   Tester Display	Measurement Item / Range	Normal Condition	Diagnostic Note
   Stop Light SW	Stop light switch / ON or OFF	ON: Brake pedal depressed OFF: Brake pedal released	-
   Brake Pedal Load Sensing SW	Brake pedal load sensing switch / ON or OFF	ON: Brake pedal depressed beyond the specified point OFF: Brake pedal not depressed beyond the specified point	-

4. Check that the stop light display observed on the Techstream changes when the brake pedal is depressed.

   OK

   When the brake pedal is depressed, the Techstream displays "ON".

5. Depress the brake pedal slowly, and check when the stop light switch and brake pedal load sensing switch turn ON.

   OK

   First the stop light switch should turn ON, and then the brake pedal load sensing switch should turn ON.

   Result

   Result	Proceed to
   OK	A
   NG (The stop light switch does not turn on)	B
   NG (The brake pedal load sensing switch turns on first)	C

C → See step   16 

B → See step   15 

A: Go to next step 

1. Turn the engine switch off.
   Fig 1: Identifying Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Make sure that there is no looseness at the locking part and the connecting part of the connector.
3. Disconnect the skid control ECU connector.
4. Turn the engine switch on (IG).
5. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   J77-1 (IG1) - Body ground	Engine switch on (IG)	11 to 14 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT) 

OK: Go to next step 

1. Turn the engine switch off.
   Fig 2: Identifying Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Make sure that there is no looseness at the locking part and the connecting part of the connectors.
3. Disconnect the skid control ECU connectors.
4. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   J78-26 (GND1) - Body ground	Always	Below 1 Ω
   J78-14 (GND2) - Body ground	Always	Below 1 Ω
   A35-22 (GND3) - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT) 

OK: Go to next step 

1. Reconnect the skid control ECU connectors.
2. Clear the DTCs. Refer to DTC CHECK / CLEAR .
3. Start the engine.
4. Depress the brake pedal several times to test the stop light circuit.
5. Check if the same DTC is recorded. Refer to DTC CHECK / CLEAR .

   Result

   Result	Proceed to
   DTC (C1249/49) is not output	A
   DTC (C1249/49) is output	B

   HINT: 

   If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step. Refer to PROBLEM SYMPTOMS TABLE .

B → See step   20 

A → See step   17 

1. Remove the STOP SW fuse from the main body ECU RH (cowl side junction block RH).
   Fig 3: Identifying Stop SW Fuse

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   STOP SW (7.5 A) fuse	Always	Below 1 Ω

NG → REPLACE STOP SW FUSE 

OK: Go to next step 

1. Install the STOP SW fuse.
   Fig 4: Identifying Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Make sure that there is no looseness at the locking part and the connecting part of the connector.
3. Disconnect the stop light switch connector.
4. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A22-2 - Body ground	Always	11 to 14 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) 

OK: Go to next step 

1. Measure the resistance according to the value(s) in the table below.
   Fig 5: Inspecting Stop Light Switch

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   1 - 2	Switch pin free	Below 1 Ω
   1 - 2	Switch pin pushed in	10 kΩ or higher

NG → See step   21 

OK: Go to next step 

1. Remove the stop light control (BRK-LP) relay.
   Fig 6: Identifying Stop Light Control Relay (BRK-LP)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   3 - 4	Voltage is not applied between terminals 1 and 2	Below 1 Ω

NG → REPLACE STOP LIGHT CONTROL RELAY (BRK-LP) 

OK: Go to next step 

1. Check the stop light control relay. Refer to INSPECTION .

   OK

   The stop light control relay is normal.

NG → See step   22 

OK: Go to next step 

1. Make sure that there is no looseness at the locking part and the connecting part of the connector.
   Fig 7: Identifying Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the stop light control relay connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A22-1 - J96-2 (STP)	Always	Below 1 Ω
   A22-1 - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Measure the resistance according to the value(s) in the table below.
   Fig 8: Identifying Terminals Of Connector & Relay

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   J96-8 (OUT) - Stop light control (BRK-LP) relay terminal 4	Always	Below 1 Ω
   J96-8 (OUT) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Make sure that there is no looseness at the locking part and the connecting part of the connector.
   Fig 9: Identifying Terminals Of Connector & Relay

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the skid control ECU connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   J77-10 (STP1) - Stop light control (BRK-LP) relay terminal 3	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Clear the DTCs. Refer to DTC CHECK / CLEAR .
2. Start the engine.
3. Depress the brake pedal several times to test the stop light circuit.
4. Check if the same DTC is recorded. Refer to DTC CHECK / CLEAR .

   HINT: 

   Reinstall the relay, connectors, etc. and restore the vehicle to its prior condition before rechecking for DTCs.

   Result

   Result	Proceed to
   DTC (C1249/49) is not output	A
   DTC (C1249/49) is output	B

   HINT: 

   If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step. Refer to PROBLEM SYMPTOMS TABLE .

B → See step   20 

A → See step   18 

1. Turn the engine switch off.
   Fig 10: Identifying Terminals Of Connector & Relay

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Remove the stop light control (BRK-LP) relay.
3. Make sure that there is no looseness at the locking part and the connecting part of the connector.
4. Disconnect the skid control ECU connector.
5. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   J77-10 (STP1) - Stop light control (BRK-LP) relay terminal 3	Always	Below 1 Ω

   HINT: 

   If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step. Refer to PROBLEM SYMPTOMS TABLE .

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   20 

1. Turn the engine switch off.
2. Check the brake pedal height and stop light switch installation. Refer to ADJUSTMENT .

   OK

   The brake pedal height and stop light switch installation are normal.

   HINT: 

   If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step. Refer to PROBLEM SYMPTOMS TABLE .

NG → See step   23 

OK → See step   19