Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM1000000018KES
Model Year Start: 2018 Model: Sienna Prod Date Range: [11/2017 -           ]
Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: C1428; Motor Circuit Malfunction; 2018 - 2020 MY Sienna [11/2017 -        ]

DTC

C1428

Motor Circuit Malfunction

DESCRIPTION

DTC No.

DTC Detection Condition

Trouble Area

C1428

With the motor relay and motor fail-safe relay OFF, open or short in motor circuit continues for 2 seconds or more.

Brake actuator assembly (motor circuit)

WIRING DIAGRAM

Refer to DTCs C1427 (See page 2018 - 2020 MY Sienna [11/2017 -        ]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: C1427; Motor Malfunction ).

CAUTION / NOTICE / HINT

NOTICE:

  • When replacing the pump motor (brake actuator assembly), perform zero point calibration and store system information (See page 2018 - 2020 MY Sienna [11/2017 -        ]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: CALIBRATION ).
  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1.

CHECK HARNESS AND CONNECTOR (GND2 TERMINAL)

(a) Make sure that there is no looseness at the locking part and the connecting part of the connectors.

(b) Disconnect the A75 skid control ECU (brake actuator assembly) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A75-1 (GND2) - Body ground

Always

Below 1 Ω

Text in Illustration

*a

Front view of wire harness connector

(to Skid Control ECU (Brake Actuator Assembly))
OK

REPLACE BRAKE ACTUATOR ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (GND2 CIRCUIT)