Toyota Sienna Service Manual: ABS Warning Light Remains ON

Toyota Sienna Service Manual / Brake control / Anti-lock brake system / Diagnostic trouble code chart / ABS Warning Light Remains ON

DESCRIPTION

If any of the following is detected, the ABS warning light remains on.

The skid control ECU connectors are disconnected from the skid control ECU.
There is a malfunction in the skid control ECU internal circuit.
There is an open in the harness between the combination meter and the skid control ECU.

HINT: In some cases, the intelligent tester cannot be used when the skid control ECU is abnormal.

WIRING DIAGRAM

WIRING DIAGRAM

INSPECTION PROCEDURE

1 INSPECT SKID CONTROL ECU CONNECTOR IS SECURELY CONNECTED

(a) Check the skid control ECU connector's connecting condition.

OK: The connector should be securely connected.

2 INSPECT BATTERY

(a) Check the battery voltage.

Standard voltage: 11 to 14 V

2 INSPECT BATTERY

(a) Check the battery voltage.

Standard voltage: 11 to 14 V

3 INSPECT SKID CONTROL ECU (IG1 TERMINAL VOLTAGE)

INSPECT SKID CONTROL ECU (IG1 TERMINAL VOLTAGE)

(a) Disconnect the skid control ECU connector.

(b) Turn the ignition switch to the ON position.

Standard voltage

4 INSPECT SKID CONTROL ECU (GND TERMINAL CONTINUITY)

INSPECT SKID CONTROL ECU (GND TERMINAL CONTINUITY)

(a) Turn the ignition switch off.

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

Standard resistance

5 CHECK HARNESS AND CONNECTOR (BETWEEN SKID CONTROL ECU AND COMBINATION METER ASSEMBLY)

CHECK HARNESS AND CONNECTOR (BETWEEN SKID CONTROL ECU AND COMBINATION METER ASSEMBLY)

(a) Disconnect the combination meter connector.

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

Standard resistance

6 INSPECT COMBINATION METER ASSEMBLY

(a) Check the combination meter (See page ME-4).

HINT: If troubleshooting has been carried out according to the PROBLEM SYMPTOMS TABLE, refer back to the table and proceed to the next step before replacing the part (See page BC-7).

REPLACE BRAKE ACTUATOR ASSEMBLY

Open in Pump Motor Circuit

DTC C1251/51 Open in Pump Motor Circuit DESCRIPTION The motor relay (semiconductor relay) is housed in the brake actuator assembly and drives the pump motor based on a signal from the skid contro ...

ABS Warning Light does not Come ON

WIRING DIAGRAM See page BC-47. INSPECTION PROCEDURE 1 INSPECT ABS WARNING LIGHT (a) Disconnect the skid control ECU connector. (b) Turn the ignition switch to the ON position. (c) Check that ...

Other materials:

Installation
1. INSTALL 3 POINT TYPE NO. 2 REAR SEAT BELT ASSEMBLY Check the degree of tilt when the belt begins to lock the ELR. Check that the belt does not lock within 15 of tilt in all directions but that the belt locks with over 45 of tilt, when gently moving the retractor. ...

Test mode procedure
1. SPEED SENSOR SIGNAL CHECK (WHEN USING SST CHECK WIRE): HINT: If the ignition switch is turned from the ON to the ACC or LOCK position during Test Mode, the DTCs of the signal check function will be erased. (a) Turn the ignition switch off. (b) Check that the steering wheel is in th ...

ECU Power Source Circuit
DESCRIPTION The position control ECU and switch assembly (power seat control switch and ECU) is contained in the switch assembly. During manual operation, only one switch signal is accepted. If signals are input from 2 or more switches simultaneously, all of them are ignored, except when s ...