Toyota Sienna Service Manual: 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 the ON position, the relay goes on.
WIRING DIAGRAM
Refer to DTCs C0226/21, C0236/22, C0246/23 and C0256/24 (See page BC-105).
INSPECTION PROCEDURE
1 INSPECT ABS 2 FUSE
(a) Remove the ABS 2 fuse from the FL block.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance 
2 INSPECT SKID CONTROL ECU
(a) Disconnect the skid control ECU connector.
(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 RECONFIRM DTC
HINT: This code is detected when a problem is determined in the brake actuator assembly.
The ABS solenoid relay is in the brake actuator assembly.
Therefore, solenoid relay circuit inspection relay unit inspection cannot be performed. Be sure to check if the DTC code is output before replacing the brake actuator assembly.
(a) Clear the DTCs (See page BC-82).
(b) Turn the ignition switch to the ON position.
(c) Are the same DTCs recorded?
Result 
NOTICE: When replacing brake actuator assembly, perform zero point calibration (See page BC-70).
REPLACE BRAKE ACTUATOR ASSEMBLY
4 INSPECT SKID CONTROL ECU (GND TERMINAL)
(a) Disconnect the skid control ECU connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance 
5 RECONFIRM DTC
HINT: This code is detected when a problem is determined in the brake actuator assembly.
The ABS solenoid relay is in the brake actuator assembly.
Therefore, solenoid relay circuit inspection relay unit inspection cannot be performed. Be sure to check if the DTC code is output before replacing the brake actuator assembly.
(a) Clear the DTCs (See page BC-82).
(b) Turn the ignition switch to the ON position.
(c) Are the same DTCs recorded?
Result 
HINT: It is suspected that the DTCs output was caused by the poor connection of the connector terminal.
NOTICE: When replacing brake actuator assembly, perform zero point calibration (See page BC-70).
REPLACE BRAKE ACTUATOR ASSEMBLY
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
moto ...
Engine Control System Malfunction
DTC C1201/51 Engine Control System Malfunction
DESCRIPTION
If trouble occurs the engine control system, the ECM transmits the
abnormality to the skid control ECU.
The skid control ECU set this ...
Other materials:
Throttle / Pedal Position Sensor/ Switch
DTC P2120 Throttle / Pedal Position Sensor / Switch "D"
Circuit
DTC P2122 Throttle / Pedal Position Sensor / Switch "D"
Circuit Low Input
DTC P2123 Throttle / Pedal Position Sensor / Switch "D"
Circuit High Input
DTC P2125 Throttle / Pedal Position Sensor / Switch ...
Inspection
1. INSPECT SEAT HEATER SWITCH LH
Measure the resistance of the seat heater switch
when the switch is operated.
Resistance
If the result is not as specified, replace the switch.
HINT:
As the dial is being turned, the resistance changes
gradually.
Push the seat h ...
Precaution
1. HANDLING PRECAUTIONS ON STEERING SYSTEM
(a) Be careful to replace the parts properly because
they could affect the performance of the steering
system and result in a driving hazard.
2. HANDLING PRECAUTIONS ON SRS AIRBAG
SYSTEM
(a) The SIENNA is equipped with SRS (Supplemental
Restraint Sys ...
