C1249/49

DESCRIPTION

The skid control ECU inputs the stop light switch signal and detects braking condition.
The skid control ECU has a circuit for open detection inside. The skid control ECU outputs the DTC if it detects an open in the stop light signal input line when the stop light switch is off or an open in the stop light circuit (GND side).

DTC No.	INF Code	DTC Detecting Condition	Trouble Area
C1249/49	520	Stop light switch circuit is open for at least 10 sec. when IG1 terminal voltage is between 9.5 V and 17.2 V	Stop light switch Stop light switch circuit Rear combination light (stop light) assembly

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:

When replacing the skid control ECU, perform initialization of linear solenoid valve and calibration (Click here).

1. CHECK STOP LIGHT SWITCH OPERATION

1. Check that the stop light comes on when the brake pedal is depressed and turns off when the brake pedal is released.
   

   OK:

   Condition	Illumination Condition
   Brake pedal depressed	ON
   Brake pedal released	OFF

   HINT:

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

NG	REPAIR STOP LIGHT CIRCUIT

OK

2. CHECK HARNESS AND CONNECTOR (BETWEEN SKID CONTROL ECU AND STOP LIGHT SWITCH)

1. Disconnect the stop light switch connector and skid control ECU connector.

2. Measure the resistance according to the value(s) in the table below.

   Resistance:

   Tester Connection	Specified Condition
   S40-14 (STP) - S13-1	Below 1 Ω

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3. INSPECT SKID CONTROL ECU (GND TERMINAL)

1. Connect the skid control ECU connector.

2. Measure the resistance according to the value(s) in the table below.

   Resistance:

   Tester Connection	Specified Condition
   S41-1 (GND1) - Body ground	Below 1 Ω
   S40-2 (GND2) - Body ground	Below 1 Ω
   S40-1 (GND3) - Body ground	Below 1 Ω
   S39-2 (GND4) - Body ground	Below 1 Ω
   S39-1 (GND5) - Body ground	Below 1 Ω
   S38-4 (GND6) - Body ground	Below 1 Ω

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4. INSPECT STOP LIGHT SWITCH ASSEMBLY

1. Disconnect the stop light switch assembly connector.

2. Measure the resistance according to the value(s) in the table below.

   Resistance:

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

NG	REPLACE STOP LIGHT SWITCH ASSEMBLY

OK

5. RECONFIRM DTC

1. Clear the DTC (Click here).

2. Turn the ignition switch on.

3. Depress the brake pedal several times to test the stop light circuit.

4. Check that the same DTC is recorded (Click here).

   HINT:

   Reinstall the sensors, connectors, etc. and store the previous vehicle conditions before rechecking for DTCs.

   
   

   Result:

   Condition	Proceed To
   DTC is not output	A
   DTC is output	B

B	REPLACE SKID CONTROL ECU

A
END