Vehicle Stability Control System
BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: C1249/49: Open in Stop Light Switch Circuit
DTC C1249/49 - Open in Stop Light Switch Circuit
DESCRIPTION
(*1): with Dynamic Laser Cruise Control System
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
When replacing the brake actuator assembly, perform zero point calibration Calibration.
PROCEDURE
1. INSPECT STOP FUSE
(a) Remove the STOP fuse from the instrument panel J/B.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:
(c) Install the STOP fuse.
NG -- REPLACE STOP FUSE
OK -- Continue to next step.
2. CHECK STOP LIGHT (OPERATION)
(a) Check that the stop light comes on when the brake pedal is depressed, and goes off when the brake pedal is released.
OK:
NG -- INSPECT STOP LIGHT SWITCH (POWER SOURCE TERMINAL)
OK -- Continue to next step.
3. INSPECT SKID CONTROL ECU (STP1 TERMINAL)
(a) Disconnect the skid control ECU connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard voltage:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (STP1 CIRCUIT)
OK -- Continue to next step.
4. INSPECT SKID CONTROL ECU (IG1 VOLTAGE)
(a) Turn the ignition switch to the ON position.
(b) Measure the voltage according to the value(s) in the table below.
Standard voltage:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT)
OK -- Continue to next step.
5. INSPECT SKID CONTROL ECU (GND TERMINALS)
(a) Turn the ignition switch off.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT)
OK -- Continue to next step.
6. READ VALUE USING TECHSTREAM (STOP LIGHT SWITCH SIGNAL)
(a) Reconnect the skid control ECU connector.
(b) Connect the Techstream to the DLC3.
(c) Start the engine.
(d) Select the Data List mode on the Techstream Data List / Active Test.
ABS/VSC/TRAC:
(e) 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".
(f) Slowly depress the brake pedal, 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:
C -- CHECK BRAKE PEDAL AND STOP LIGHT SWITCH INSTALLATION
B -- REPLACE BRAKE ACTUATOR ASSEMBLY
A -- Continue to next step.
7. RECONFIRM DTC
(a) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.
(b) Start the engine.
(c) Depress the brake pedal several times to test the stop light circuit.
(d) Check if the same DTC is recorded Reading and Clearing Diagnostic Trouble Codes.
Result:
HINT: If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step Problem Symptoms Table.
B -- REPLACE BRAKE ACTUATOR ASSEMBLY
A -- CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION)
8. CHECK BRAKE PEDAL AND STOP LIGHT SWITCH INSTALLATION
(a) Check the brake pedal height and stop light switch installation Adjustments.
OK:
The brake pedal and stop light switch are normal.
NG -- ADJUST BRAKE PEDAL AND STOP LIGHT SWITCH INSTALLATION
OK -- Continue to next step.
9. RECONFIRM DTC
(a) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.
(b) Start the engine.
(c) Depress the brake pedal several times to test the stop light circuit.
(d) Check if the same DTC is recorded Reading and Clearing Diagnostic Trouble Codes.
Result:
HINT: If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step Problem Symptoms Table.
B -- REPLACE BRAKE PEDAL SUB-ASSEMBLY (BRAKE PEDAL LOAD SENSING SWITCH)
A -- CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION)
10. INSPECT STOP LIGHT SWITCH (POWER SOURCE TERMINAL)
(a) Disconnect the stop light switch connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard voltage:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)
OK -- Continue to next step.
11. INSPECT STOP LIGHT SWITCH
(a) Measure the resistance according to the value(s) in the table below.
Standard resistance:
Result:
C -- REPLACE STOP LIGHT SWITCH
B -- CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH - SKID CONTROL ECU)
A -- Continue to next step.
12. INSPECT BRK RELAY
(a) Remove the BRK relay.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:
NG -- REPLACE BRK RELAY
OK -- Continue to next step.
13. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH - R/B NO. 3)
(a) Measure the resistance according to the value(s) in the table below.
Standard resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (STOP LIGHT SWITCH - R/B NO. 3)
OK -- Continue to next step.
14. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - R/B NO. 3)
(a) Disconnect the skid control ECU connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (SKID CONTROL ECU - R/B NO. 3)
OK -- Continue to next step.
15. RECONFIRM DTC
(a) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.
(b) Start the engine.
(c) Depress the brake pedal several times to test the stop light circuit.
(d) Check if the same DTC is recorded Reading and Clearing Diagnostic Trouble Codes.
HINT: Reinstall the relay, connectors, etc. and restore the vehicle to its prior condition before rechecking for DTCs.
Result:
HINT: If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step Problem Symptoms Table.
B -- REPLACE BRAKE ACTUATOR ASSEMBLY
A -- INSPECT LIGHTING SYSTEM (STOP LIGHT CIRCUIT)
16. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH - SKID CONTROL ECU)
(a) Disconnect the skid control ECU connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (STOP LIGHT SWITCH - SKID CONTROL ECU)
OK -- Continue to next step.
17. RECONFIRM DTC
(a) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.
(b) Start the engine.
(c) Depress the brake pedal several times to test the stop light circuit.
(d) Check if the same DTC is recorded Reading and Clearing Diagnostic Trouble Codes.
HINT: Reinstall the relay, connectors, etc. and restore the vehicle to its prior condition before rechecking for DTCs.
Result:
HINT: If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step Problem Symptoms Table.
B -- REPLACE BRAKE ACTUATOR ASSEMBLY
A -- INSPECT LIGHTING SYSTEM (STOP LIGHT CIRCUIT)