Dtc C1305/21 Solenoid Identification Circuit

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

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

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

INSPECT SKID CONTROL ECU (IDENTIFICATION OUTPUT)

RECONFIRM DTC

DTC C1305/21 Solenoid Identification Circuit


DESCRIPTION

The skid control ECU receives solenoid identification signals from terminals SSEL and SEL2. The ECU specifies control characteristics of the brake actuator by monitoring the difference in the holding solenoid (FRA, FLA, RRA and RLA) current, which is caused by characteristics of each actuator.

Lexus Is250, Is220D. Gse20 Ale20.Brake Control.Vehicle Stability Control System (W/ Vdim). Dtc C1305/21 Solenoid Identification Circuit


DTC No.
DTC Detection Condition
Trouble Area
C1305/21
Immediately after the engine is started, an open or short in the solenoid characteristics identification circuit continues for 0.21 seconds or more.
  1. Internal solenoid identification circuit of the brake actuator assembly
  2. Skid control ECU

WIRING DIAGRAM


Lexus Is250, Is220D. Gse20 Ale20.Brake Control.Vehicle Stability Control System (W/ Vdim). Dtc C1305/21 Solenoid Identification Circuit


INSPECTION PROCEDURE

NOTICE:
When replacing the skid control ECU, perform zero point calibration and store system information (Click here).
1.CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - BRAKE ACTUATOR ASSEMBLY)


    Lexus Is250, Is220D. Gse20 Ale20.Brake Control.Vehicle Stability Control System (W/ Vdim). Dtc C1305/21 Solenoid Identification Circuit

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

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

    Standard resistance:
    LHD:
    Tester Connection
    		Condition
    		Specified Condition
    A35-14 (SSEL) - A13-44 (SSEL)
    		Always
    		Below 1 Ω
    A35-14 (SSEL) - Body ground
    		Always
    		10 kΩ or higher
    A35-16 (SEL2) - A13-41 (SEL2)
    		Always
    		Below 1 Ω
    A35-16 (SEL2) - Body ground
    		Always
    		10 kΩ or higher
    RHD:
    Tester Connection
    		Condition
    		Specified Condition
    J98-14 (SSEL) - A13-44 (SSEL)
    		Always
    		Below 1 Ω
    J98-14 (SSEL) - Body ground
    		Always
    		10 kΩ or higher
    J98-16 (SEL2) - A13-41 (SEL2)
    		Always
    		Below 1 Ω
    J98-16 (SEL2) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


2.INSPECT SKID CONTROL ECU (IDENTIFICATION OUTPUT)


    Lexus Is250, Is220D. Gse20 Ale20.Brake Control.Vehicle Stability Control System (W/ Vdim). Dtc C1305/21 Solenoid Identification Circuit

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

  1. Start the engine.

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

    Standard voltage:
    LHD:
    Tester Connection
    		Condition
    		Specified Condition
    A35-14 (SSEL) - Body ground
    		Low (Normal)
    		0 V
    A35-14 (SSEL) - Body ground
    		Middle
    		3.7 to 8.26 V
    A35-14 (SSEL) - Body ground
    		High
    		7.8 to 14 V
    A35-16 (SEL2) - Body ground
    		Low (Normal)
    		0 V
    A35-16 (SEL2) - Body ground
    		Middle
    		3.7 to 8.26 V
    A35-16 (SEL2) - Body ground
    		High
    		7.8 to 14 V
    RHD:
    Tester Connection
    		Condition
    		Specified Condition
    J98-14 (SSEL) - Body ground
    		Low (Normal)
    		0 V
    J98-14 (SSEL) - Body ground
    		Middle
    		3.7 to 8.26 V
    J98-14 (SSEL) - Body ground
    		High
    		7.8 to 14 V
    J98-16 (SEL2) - Body ground
    		Low (Normal)
    		0 V
    J98-16 (SEL2) - Body ground
    		Middle
    		3.7 to 8.26 V
    J98-16 (SEL2) - Body ground
    		High
    		7.8 to 14 V
    OK:
    Input voltage of SSEL and SEL2 is the same under all conditions.


NG
REPLACE BRAKE ACTUATOR ASSEMBLY
OK


3.RECONFIRM DTC

  1. Turn the engine switch off.

  1. Clear the DTC (Click here).

  1. Drive the vehicle at the speed of 15 mph (24 km/h) or more.

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

    Result:

    Condition
    		Proceed to
    DTC (C1305/21) is not output
    		A
    DTC (C1305/21) 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