C1249

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: C1249/49: Open in Stop Light Switch Circuit

DTC C1249/49 - Open in Stop Light Switch Circuit

DESCRIPTION

The skid control ECU receives the stop light switch signal and detects the status of brake operation.
The skid control ECU has an open detection circuit.
If an open in the stop light switch input line or GND side stop light circuit is detected when the stop light switch is off, this DTC is output.





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTE: When replacing the master cylinder solenoid, perform zero point calibration Programming and Relearning.

PROCEDURE

1. CHECK STOP LIGHT SWITCH 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:
Stop light switch function is normal.

HINT: Check the stop light bulb as it may have burnt out.

NG -- INSPECT STOP LIGHT SWITCH ASSEMBLY (POWER SOURCE TERMINAL)
OK -- Continue to next step.

2. INSPECT SKID CONTROL ECU (STP 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 (STP CIRCUIT)
OK -- Continue to next step.

3. RECONFIRM DTC C1242
B -- CHECK FOR INTERMITTENT PROBLEMS
A -- REPLACE MASTER CYLINDER SOLENOID
4. INSPECT STOP LIGHT SWITCH ASSEMBLY (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:

w/o Rear Spoiler





w/ Rear Spoiler





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)
OK -- Continue to next step.

5. INSPECT STOP LIGHT SWITCH ASSEMBLY




(a) Measure the resistance according to the value(s) in the table below.
Standard resistance:





NG -- REPLACE STOP LIGHT SWITCH ASSEMBLY
OK -- Continue to next step.

6. INSPECT STOP LIGHT OPERATION RELAY




(a) Remove the stop light operation relay.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:





NG -- REPLACE STOP LIGHT OPERATION RELAY
OK -- Continue to next step.

7. 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:

w/o Rear Spoiler





w/ Rear Spoiler





HINT:
- When troubleshooting in accordance with the DTC CHART, check for DTCs before replacing the master cylinder solenoid Reading and Clearing Diagnostic Trouble Codes.
- When troubleshooting in accordance with the PROBLEM SYMPTOMS TABLE, be sure to follow the table before replacing the master cylinder solenoid Problem Symptoms Table.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE MASTER CYLINDER SOLENOID