Open in Stop Light Switch Circuit - Vehicle Stability Control System (w/o VDIM)
BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM (w/o VDIM): C1249/49: Open in Stop Light Switch Circuit
DTC C1249/49 - Open in Stop Light Switch Circuit
DESCRIPTION
The skid control ECU (housed in the actuator assembly) inputs the stop light switch signal and the condition of brake operation.
The skid control ECU has an open detection circuit, which outputs this DTC when detecting an open in the stop light input line while the stop light switch is OFF.
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTE: When replacing the brake actuator assembly, perform zero point calibration Vehicle Stability Control System (W/O VDIM).
PROCEDURE
1. INSPECT STOP SW FUSE
(a) Remove the STOP SW fuse from the main body ECU RH.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:
NG -- REPLACE STOP SW FUSE
OK -- Continue to next step.
2. CHECK STOP LIGHT OPERATION
(a) Install the STOP SW fuse.
(b) 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 AND GND TERMINAL)
(a) Turn the engine switch on (IG).
(b) Measure the voltage according to the value(s) in the table below.
Standard voltage:
(c) Turn the engine switch off.
(d) Measure the resistance according to the value(s) in the table below.
Standard resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 OR GND CIRCUIT)
OK -- Continue to next step.
5. READ VALUE USING TECHSTREAM (STOP LIGHT SWITCH AND BRAKE PEDAL LOAD SENSING SWITCH)
(a) Reconnect the skid control ECU connector.
(b) Connect Techstream to the DLC3.
(c) Start the engine.
(d) Select the Data List mode on Techstream.
ABS / VSC / TRAC:
(e) Check that the stop light display observed on Techstream changes when the brake pedal is depressed.
OK:
When the brake pedal is depressed, 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.
6. RECONFIRM DTC
(a) Clear the DTC Vehicle Stability Control System (w/o VDIM).
(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 Vehicle Stability Control System (w/o VDIM).
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 -- USE SIMULATION METHOD TO CHECK
7. 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 OR STOP LIGHT SWITCH
OK -- Continue to next step.
8. RECONFIRM DTC
(a) Clear the DTC Vehicle Stability Control System (w/o VDIM).
(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 Vehicle Stability Control System (w/o VDIM).
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 -- USE SIMULATION METHOD TO CHECK
9. 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.
10. 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 (SKID CONTROL ECU - STOP LIGHT SWITCH)
A -- Continue to next step.
11. INSPECT STOP LIGHT CONTROL RELAY
(a) Remove the stop light control relay.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:
NG -- REPLACE STOP LIGHT CONTROL RELAY
OK -- Continue to next step.
12. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH - ENGINE ROOM NO. 2 RELAY BLOCK)
(a) Measure the resistance according to the value(s) in the table below.
Standard resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
13. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - ENGINE ROOM NO. 2 RELAY BLOCK)
(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
OK -- Continue to next step.
14. RECONFIRM DTC
(a) Clear the DTC Vehicle Stability Control System (w/o VDIM).
(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 Vehicle Stability Control System (w/o VDIM).
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)
15. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - STOP LIGHT SWITCH)
(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
OK -- Continue to next step.
16. RECONFIRM DTC
(a) Reconnect the skid control ECU connector and the stop light switch connector.
(b) Start the engine.
(c) Depress the brake pedal several times to test the stop light circuit.
(d) Clear the DTC Vehicle Stability Control System (w/o VDIM).
(e) Check if the same DTC is recorded Vehicle Stability Control System (w/o VDIM).
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)