Dtc C1225/25 Sm Solenoid Circuit

Brake. Lexus Is250, Is220D. Gse20 Ale20
Brake Control. Lexus Is250, Is220D. Gse20 Ale20

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT BRAKE ACTUATOR ASSEMBLY

CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - BRAKE ACTUATOR ASSEMBLY)

RECONFIRM DTC

DTC C1225/25 SM Solenoid Circuit


DESCRIPTION


DTC No.
DTC Detection Condition
Trouble Area
C1225/25
When any of the following is detected:
  1. While switching solenoid (SM1 or SM2) ON is being output, overcurrent continues for 0.05 seconds or more.
  2. While switching solenoid (SM1 or SM2) OFF is being output, an open circuit continues for 0.05 seconds or more.
  3. While switching solenoid (SM1 or SM2) ON is being output, an open circuit continues for 0.1 seconds or more.
  4. While switching solenoid (SM1 or SM2) OFF is being output, current continues to be applied for 0.1 seconds or more.
  5. Short to GND in the switching solenoid (SM1 or SM2) continues for 0.1 seconds or more.
  6. Switching solenoids SM1 and SM2 are shorted for 0.1 seconds or more.
  1. SM1 or SM2 circuit
  2. Skid control ECU

WIRING DIAGRAM


Lexus Is250, Is220D. Gse20 Ale20.Brake Control.Vehicle Stability Control System (W/ Vdim). Dtc C1225/25 Sm Solenoid Circuit


INSPECTION PROCEDURE

NOTICE:
When replacing the skid control ECU, perform zero point calibration and store system information (Click here).
1.INSPECT BRAKE ACTUATOR ASSEMBLY


    Lexus Is250, Is220D. Gse20 Ale20.Brake Control.Vehicle Stability Control System (W/ Vdim). Dtc C1225/25 Sm Solenoid Circuit

  1. Disconnect the brake actuator connector.

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    13 (SM1+) - 14 (SM1-)
    		Always
    		8.1 to 9.1 Ω
    at 25°C (77°F)
    14 (SM1-) - Body ground
    		Always
    		10 kΩ or higher
    15 (SM2+) - 16 (SM2-)
    		Always
    		8.1 to 9.1 Ω
    at 25°C (77°F)
    16 (SM2-) - Body ground
    		Always
    		10 kΩ or higher


NG
REPLACE BRAKE ACTUATOR ASSEMBLY
OK


2.CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - BRAKE ACTUATOR ASSEMBLY)


    Lexus Is250, Is220D. Gse20 Ale20.Brake Control.Vehicle Stability Control System (W/ Vdim). Dtc C1225/25 Sm Solenoid Circuit

  1. Disconnect the skid control ECU connector.

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    J78-25 (SM1+) - A13-13 (SM1+)
    		Always
    		Below 1 Ω
    J78-25 (SM1+) - Body ground
    		Always
    		10 kΩ or higher
    J78-12 (SM1-) - A13-14 (SM1-)
    		Always
    		Below 1 Ω
    J78-12 (SM1-) - Body ground
    		Always
    		10 kΩ or higher
    J78-11 (SM2+) - A13-15 (SM2+)
    		Always
    		Below 1 Ω
    J78-11 (SM2+) - Body ground
    		Always
    		10 kΩ or higher
    J78-24 (SM2-) - A13-16 (SM2-)
    		Always
    		Below 1 Ω
    J78-24 (SM2-) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.RECONFIRM DTC

  1. Reconnect the skid control ECU connector and the brake actuator connector.

  1. Clear the DTC (Click here).

  1. Start the engine.

  1. Check if the same DTC is recorded (Click here).

    Result:

    Condition
    		Proceed to
    DTC (C1225/25) is not output
    		A
    DTC (C1225/25) is output
    		B
    HINT:
    1. If the normal system code is output (the trouble code is not output), slightly jiggle the connectors, wire harness, and fuses of the skid control ECU and brake actuator assembly. Make sure that no DTCs are output.
    2. If any DTCs are output while jiggling a connector or wire harness of the skid control ECU and brake actuator assembly, inspect and repair the connector or wire harness.


B
REPLACE SKID CONTROL ECU
A

USE SIMULATION METHOD TO CHECK