DESCRIPTION
The skid control ECU detects the brake operating conditions through a signal transmitted by the stop light switch. The skid control ECU incorporates an open circuit detection circuit.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1249 | When either of following (1 or 2) detected:
|
|
CAUTION / NOTICE / HINT
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
PROCEDURE
- Click here
READ VALUE USING INTELLIGENT TESTER (STOP LIGHT SW)
-
Connect the intelligent tester to the DLC3.
-
Turn the ignition switch to ON.
-
Turn the tester on.
-
Enter the following menu: Chassis / ABS/VSC/TRC / Data List.
-
In accordance with the display on the tester, read the Data List.
Table 1. ABS/VSC/TRC Tester Display Measurement Item/Range Normal Condition Diagnostic Note Stop Light SW Stop light switch:
OFF or ON
OFF: Brake pedal released
ON: Brake pedal applied
- -
Check that "Stop Light SW" turns ON and OFF when the brake pedal is depressed and released.
OK "Stop Light SW" turns on and off in accordance with the operation of the brake pedal.
- OK
CHECK FOR INTERMITTENT PROBLEMS (Click here)
- NGClick here
-
- Click here
CHECK SKID CONTROL ECU TERMINAL VOLTAGE (STP TERMINAL)
-
Disconnect the skid control ECU connector.
-
Measure the voltage according to the value(s) in the table below.
Standard Voltage (for LHD with CVT, and RHD) Tester Connection Condition Specified Condition A78-17 (STP) - Body ground Brake pedal depressed 11 to 14 V Brake pedal released Below 1.5 V Standard Voltage (for LHD except CVT) Tester Connection Condition Specified Condition A79-17 (STP) - Body ground Brake pedal depressed 11 to 14 V Brake pedal released Below 1.5 V Table 2. Text in Illustration *A for LHD with CVT, and RHD *B for LHD except CVT *a Front view of wire harness connector
(to skid control ECU)
Table 3. Result Result Proceed to NG A OK (for LHD) B OK (for RHD) C -
Reconnect the skid control ECU connector.
- AClick here
- B
REPLACE BRAKE ACTUATOR ASSEMBLY (Click here)
- C
REPLACE BRAKE ACTUATOR ASSEMBLY (Click here)
-
- Click here
INSPECT STOP LIGHT SWITCH ASSEMBLY
-
Disconnect the stop light switch connector.
-
Measure the resistance according to the value(s) in the table below.
Standard Resistance Tester Connection Condition Specified Condition 1 - 2 Switch pin released Below 1 Ω Switch pin pushed in 10 kΩ or higher 3 - 4 Switch pin released 10 kΩ or higher Switch pin pushed in Below 1 Ω Table 4. Text in Illustration *a Component without harness connected
(Stop Light Switch)
*b Released *c Pushed in
- OKClick here
- NG
REPLACE STOP LIGHT SWITCH ASSEMBLY (Click here)
-
- Click here
CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH - BATTERY)
-
Measure the voltage according to the value(s) in the table below.
Standard Voltage Tester Connection Condition Specified Condition A38-2 - body ground Always 11 to 14 V Table 5. Text in Illustration *a Front view of wire harness connector
(to Stop Light Switch)
- OKClick here
- NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
-
- Click here
CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - STOP LIGHT SWITCH)
-
Disconnect the skid control ECU connector.
-
Measure the resistance according to the value(s) in the table below.
Standard Resistance (for LHD with CVT, and RHD) Tester Connection Condition Specified Condition A78-17 (STP) - A38-1 Always Below 1 Ω Standard Resistance (for LHD except CVT) Tester Connection Condition Specified Condition A79-17 (STP) - A38-1 Always Below 1 Ω
- OKClick here
- NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
-
- Click here
RECONFIRM DTC
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Clear the DTC (Click here).
-
Check if the same DTC is output (Click here).
Table 6. Result Result Proceed to DTC C1249 is not output A DTC C1249 is output (for LHD) B DTC C1249 is output (for RHD) C
- A
CHECK FOR INTERMITTENT PROBLEMS (Click here)
- B
REPLACE BRAKE ACTUATOR ASSEMBLY (Click here)
- C
REPLACE BRAKE ACTUATOR ASSEMBLY (Click here)
-