Dtc C0273/13 Open In Abs Motor Relay Circuit

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

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT ABS1 FUSE

INSPECT ABS MOTOR2 RELAY

INSPECT ABS MOTOR1 (FAIL SAFE) RELAY

INSPECT ENGINE ROOM NO. 3 RELAY BLOCK (POWER SOURCE TERMINAL)

INSPECT ENGINE ROOM NO. 3 RELAY BLOCK

INSPECT BRAKE ACTUATOR ASSEMBLY

CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - ENGINE ROOM NO. 3 RELAY BLOCK)

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

CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - ENGINE ROOM NO. 3 RELAY BLOCK)

RECONFIRM DTC

DTC C0273/13 Open in ABS Motor Relay Circuit

DTC C0274/14 Short to B+ in ABS Motor Relay Circuit

DTC C1361/91 Short Circuit in ABS Motor Fail Safe Relay Circuit


DESCRIPTION

If a DTC of the motor line is stored, the ABS MOTOR1 (fail safe) relay cuts off the power supply to the ABS MOTOR2 relay and performs fail safe.
While any of the ABS, TRC, VSC, or BA is operating, the skid control ECU (housed in the actuator assembly) turns the ABS MOTOR2 relay on and activates the pump motor in the brake actuator.
This code may be stored if the motor relay (+BM) voltage becomes lower than the DTC detecting condition due to insufficient output from the battery or alternator.

DTC No.
DTC Detection Condition
Trouble Area
C0273/13
When any of the following (1 or 2) is detected:
  1. All of the following conditions continue for 0.12 seconds or more.
    1. The IG1 terminal voltage is between 9.5 and 17.2 V.
    2. ABS, BA, TRC, or VSC are in operation during initial check.
    3. Relay contact is open when the relay is ON.
  2. All of the following conditions continue for 0.12 seconds.
    1. The IG1 terminal voltage is 9.5 V or less.
    2. Relay contact remains open when the relay is ON.
  1. ABS1 fuse
  2. ABS MOTOR2 relay
  3. ABS MOTOR2 relay circuit
  4. Brake actuator assembly
  5. Skid control ECU
C0274/14
When the motor relay is OFF, the ABS MOTOR2 relay remains closed for 4 seconds or more.
  1. ABS1 fuse
  2. ABS MOTOR2 relay
  3. ABS MOTOR2 relay circuit
  4. Brake actuator assembly
  5. Skid control ECU
C1361/91
Immediately after the engine switch is turned on (IG), the relay contact is closed for 4 seconds when the ABS MOTOR1 (fail safe) relay is OFF.
  1. ABS1 fuse
  2. ABS MOTOR1 (fail safe) relay
  3. ABS MOTOR1 (fail safe) relay circuit
  4. Brake actuator assembly
  5. Skid control ECU

WIRING DIAGRAM


Lexus Is250, Is220D. Gse20 Ale20.Brake Control.Vehicle Stability Control System (W/ Vdim). Dtc C0273/13 Open In Abs Motor Relay Circuit


INSPECTION PROCEDURE

NOTICE:
When replacing the skid control ECU, perform zero point calibration and store system information (Click here).
1.INSPECT ABS1 FUSE


    Lexus Is250, Is220D. Gse20 Ale20.Brake Control.Vehicle Stability Control System (W/ Vdim). Dtc C0273/13 Open In Abs Motor Relay Circuit

  1. Remove the ABS1 fuse from the engine room No. 1 R/B.

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    ABS1 (50 A) fuse
    		Always
    		Below 1 Ω


NG
REPLACE ABS1 FUSE
OK


2.INSPECT ABS MOTOR2 RELAY


    Lexus Is250, Is220D. Gse20 Ale20.Brake Control.Vehicle Stability Control System (W/ Vdim). Dtc C0273/13 Open In Abs Motor Relay Circuit

  1. Install the ABS1 fuse.

  1. Remove the ABS MOTOR2 relay.

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    3 - 5
    		Always
    		10 kΩ or higher
    3 - 5
    		Apply B+ between terminals 1 and 2
    		Below 1 Ω


NG
REPLACE ABS MOTOR2 RELAY
OK


3.INSPECT ABS MOTOR1 (FAIL SAFE) RELAY


    Lexus Is250, Is220D. Gse20 Ale20.Brake Control.Vehicle Stability Control System (W/ Vdim). Dtc C0273/13 Open In Abs Motor Relay Circuit

  1. Remove the ABS MOTOR1 (fail safe) relay.

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    3 - 5
    		Always
    		10 kΩ or higher
    3 - 5
    		Apply B+ between terminals 1 and 2
    		Below 1 Ω


NG
REPLACE ABS MOTOR1 (FAIL SAFE) RELAY
OK


4.INSPECT ENGINE ROOM NO. 3 RELAY BLOCK (POWER SOURCE TERMINAL)


    Lexus Is250, Is220D. Gse20 Ale20.Brake Control.Vehicle Stability Control System (W/ Vdim). Dtc C0273/13 Open In Abs Motor Relay Circuit

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

    Standard voltage:
    Tester Connection
    		Condition
    		Specified Condition
    ABS MOTOR1 (fail safe) relay terminal 5 - Body ground
    		Always
    		10 to 14 V


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)
OK


5.INSPECT ENGINE ROOM NO. 3 RELAY BLOCK


    Lexus Is250, Is220D. Gse20 Ale20.Brake Control.Vehicle Stability Control System (W/ Vdim). Dtc C0273/13 Open In Abs Motor Relay Circuit

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    ABS MOTOR1 (fail safe) relay terminal 1 - ABS MOTOR2 relay terminal 1
    		Always
    		Below 1 Ω
    ABS MOTOR1 (fail safe) relay terminal 1 - Body ground
    		Always
    		10 kΩ or higher
    ABS MOTOR1 (fail safe) relay terminal 3 - ABS MOTOR2 relay terminal 5
    		Always
    		Below 1 Ω
    ABS MOTOR1 (fail safe) relay terminal 3 - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE ENGINE ROOM NO. 3 RELAY BLOCK
OK


6.INSPECT BRAKE ACTUATOR ASSEMBLY


    Lexus Is250, Is220D. Gse20 Ale20.Brake Control.Vehicle Stability Control System (W/ Vdim). Dtc C0273/13 Open In Abs Motor Relay 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
    2 (BM) - 30 (MT)
    		Always
    		0.92 to 1.12 kΩ


NG
REPLACE BRAKE ACTUATOR ASSEMBLY
OK


7.CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - ENGINE ROOM NO. 3 RELAY BLOCK)


    Lexus Is250, Is220D. Gse20 Ale20.Brake Control.Vehicle Stability Control System (W/ Vdim). Dtc C0273/13 Open In Abs Motor Relay Circuit

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A13-2 (BM) - ABS MOTOR2 relay terminal 3
    		Always
    		Below 1 Ω
    A13-2 (BM) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


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


    Lexus Is250, Is220D. Gse20 Ale20.Brake Control.Vehicle Stability Control System (W/ Vdim). Dtc C0273/13 Open In Abs Motor Relay 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
    J78-15 (MT) - A13-30 (MT)
    		Always
    		Below 1 Ω
    J78-15 (MT) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


9.CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - ENGINE ROOM NO. 3 RELAY BLOCK)


    Lexus Is250, Is220D. Gse20 Ale20.Brake Control.Vehicle Stability Control System (W/ Vdim). Dtc C0273/13 Open In Abs Motor Relay Circuit

  1. Disconnect the skid control ECU connector.

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

    Standard resistance:
    LHD:
    Tester Connection
    		Condition
    		Specified Condition
    A35-3 (MR) - ABS MOTOR2 relay terminal 2
    		Always
    		Below 1 Ω
    A35-3 (MR) - Body ground
    		Always
    		10 kΩ or higher
    A35-11 (R+) - ABS MOTOR1 (fail safe) relay terminal 1
    		Always
    		Below 1 Ω
    A35-11 (R+) - Body ground
    		Always
    		10 kΩ or higher
    J78-1 (MRF) - ABS MOTOR1 (fail safe) relay terminal 2
    		Always
    		Below 1 Ω
    J78-1 (MRF) - Body ground
    		Always
    		10 kΩ or higher
    RHD:
    Tester Connection
    		Condition
    		Specified Condition
    J98-3 (MR) - ABS MOTOR2 relay terminal 2
    		Always
    		Below 1 Ω
    J98-3 (MR) - Body ground
    		Always
    		10 kΩ or higher
    J98-11 (R+) - ABS MOTOR1 (fail safe) relay terminal 1
    		Always
    		Below 1 Ω
    J98-11 (R+) - Body ground
    		Always
    		10 kΩ or higher
    J78-1 (MRF) - ABS MOTOR1 (fail safe) relay terminal 2
    		Always
    		Below 1 Ω
    J78-1 (MRF) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


10.RECONFIRM DTC

  1. Clear the DTC (Click here).

  1. Start the engine.

  1. Drive the vehicle at the speed of 4 mph (6 km/h) or more.

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

    HINT:
    Reinstall the relays, connectors, etc. and restore the vehicle to the condition before rechecking for DTCs.

    Result:

    Condition
    		Proceed to
    DTCs (C0273/13, C0274/14 and/or C1361/91) are not output
    		A
    DTCs (C0273/13, C0274/14 and/or C1361/91) are output
    		B
    HINT:
    1. If a speed signal of 4 mph (6 km/h) or more is input to the skid control ECU, with the engine switch on (IG) and the stop light switch off, the ECU performs self diagnosis of the motor and solenoid circuits.
    2. 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.
    3. 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