Toyota Sienna Service Manual: Open or Short Circuit in ABS Motor Relay Circuit
DESCRIPTION
The ABS motor relay supplies power to the ABS pump motor. While the ABS & TRAC & VSC are activated, the ECU switches the ABS motor relay ON and operates the ABS pump motor.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 PERFORM ACTIVE TEST USING INTELLIGENT TESTER (ABS MOTOR RELAY)
(a) Connect the intelligent tester to the DLC3.
(b) Start the engine.
(c) Select the ACTIVE TEST mode on the intelligent tester.
ABS / VSC: 
(d) Check the operation sound of the ABS motor individually when operating it with the intelligent tester.
OK: Operation sound of the ABS motor should be heard.
REPLACE BRAKE ACTUATOR ASSEMBLY
2 INSPECT NO. 5 RELAY BLOCK (POWER SOURCE TERMINAL)
(a) Remove the VSC MTR relay from the No. 5 R/B.
(b) Turn the ignition switch to the ON position.
(c) Measure the voltage according to the value(s) in the table below.
Standard voltage 
3 INSPECT ABS MOTOR RELAY (VSC MTR)
(a) Measure the resistance according to the value(s) in the table below.
Standard resistance 
(b) Apply battery positive voltage between terminals 1 and 2.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance 
4 CHECK HARNESS AND CONNECTOR (ABS MOTOR RELAY - SKID CONTROL ECU)
(a) Check for open or short circuit in harness and connector between the ABS motor relay and skid control ECU.
5 RECONFIRM DTC
(a) Clear the DTCs.
(b) Drive the vehicle at a speed of 6 km/h (4 mph) or more.
(c) Check if the same DTCs are recorded (See page BC- 82).
Result
HINT:
- The skid control ECU inspects the motor relay circuit when the stop light switch is turned off and the vehicle is running at a speed of 6 km/h (4mph) or more.
- It is suspect that the DTCs output was caused by the poor connection of the connector terminal.
REPLACE BRAKE ACTUATOR ASSEMBLY
6 INSPECT ABS 1 FUSE
(a) Remove the ABS 1 fuse from the FL block.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance 
7 INSPECT ABS MOTOR RELAY (VSC FAIL)
(a) Measure the resistance according to the value(s) in the table below.
Standard resistance 
(b) Apply battery positive voltage between terminals 1 and 2.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance 
REPAIR OR REPLACE HARNESS OR CONNECTOR
REPAIR OR REPLACE HARNESS OR CONNECTOR
SFR Solenoid Circuit
DESCRIPTION
This solenoid goes on when signals are received from the ECU and controls the
pressure acting on the
wheel cylinders to control the braking force.
WIRING DIAGRAM
INSPECTI ...
Open or Short Circuit in ABS Solenoid Relay Circuit
DESCRIPTION
The ABS solenoid relay is built in the brake actuator assembly. This relay
supplies power to each ABS
solenoid. If the initial check is OK, after the ignition switch is turned to t ...
Other materials:
Data list / active test
HINT:
By accessing the DATA LIST displayed by the intelligent
tester, you can perform such functions as reading the values
of switches and sensors without removing any parts. Reading
the DATA LIST as the first step in troubleshooting is one
method to shorten labor time.
1. DATA LIST FOR OCCUPA ...
Removal
1. PRECAUTION
HINT:
See page RS-1
2. DISCONNECT BATTERY NEGATIVE TERMINAL
Wait for 90 seconds after disconnecting the battery
terminal to prevent the airbag working.
3. PLACE FRONT WHEELS FACING STRAIGHT AHEAD
4. REMOVE STEERING WHEEL COVER LOWER NO.2
(See page RS-424)
5. REMOVE STEERING WH ...
Diagnosis system
1. CHECK DLC3
The vehicle's ECU uses ISO 15765-4 for
communication protocol. The terminal arrangement
of the DLC3 complies with SAE J1962 and matches
the ISO 15765-4 format.
NOTICE:
*: Before measuring the resistance, leave the
vehicle as is for at least 1 minute and do ...
