Toyota RAV4 manuals

Toyota Sienna Service Manual: Brake Warning Light Remains ON

DESCRIPTION

If the ECU detects a trouble, it turns on the brake warning light at the same time of prohibiting ABS control.

At this time, the ECU records a DTC in memory.

Connect terminals TC and CG of the DLC3 to make the brake warning light blink and output the DTC.

WIRING DIAGRAM

Brake Warning Light Remains ON

INSPECTION PROCEDURE

1 CHECK DTC

(a) Check if the ABS DTC is output (See page BC-10).

Result

2 INSPECT SKID CONTROL ECU CONNECTOR SECURELY CONNECTED

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

OK: The connector should be securely connected.

3 INSPECT BATTERY

(a) Check the battery voltage.

Standard voltage: 10 to 14 V

4 INSPECT SKID CONTROL ECU (IG1 TERMINAL VOLTAGE)

(a) Disconnect the skid control ECU connector.

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

INSPECT SKID CONTROL ECU (IG1 TERMINAL VOLTAGE)

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

Standard voltage

5 INSPECT SKID CONTROL ECU (GND TERMINAL CONTINUITY)

INSPECT SKID CONTROL ECU (GND TERMINAL CONTINUITY)

(a) Disconnect the skid control ECU connector.

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

Standard resistance

6 INSPECT PARKING BRAKE SWITCH

INSPECT PARKING BRAKE SWITCH

(a) Disconnect the parking brake switch connector.

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

Standard resistance

7 CHECK HARNESS AND CONNECTOR

CHECK HARNESS AND CONNECTOR

(a) Disconnect the skid control ECU connector and parking brake switch.

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

Standard resistance

8 INSPECT BRAKE FLUID LEVEL WARNING SWITCH

(a) Remove the reservoir tank cap and strainer.

(b) Disconnect the brake fluid level warning switch connector.

INSPECT BRAKE FLUID LEVEL WARNING SWITCH

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

HINT: A float is placed inside the reservoir. Its position can be changed by increasing/decreasing the level of brake fluid.

Standard resistance

HINT: If there is no problem after finishing the above check, adjust the brake fluid level to the MAX level.

9 INSPECT HARNESS AND CONNECTOR (BETWEEN BRAKE FLUID LEVEL WARNING SW AND COMBINATION METER)

(a) Disconnect the combination meter connector.

 INSPECT HARNESS AND CONNECTOR (BETWEEN BRAKE FLUID LEVEL WARNING SW

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

Standard resistance

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

(a) Turn the ignition switch off.

(b) Disconnect the combination meter connector.

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

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

Standard resistance

11 INSPECT COMBINATION METER ASSEMBLY

(a) Check the combination meter assembly (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

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 ...

Brake Warning Light does not Come ON
WIRING DIAGRAM See page BC-52. INSPECTION PROCEDURE 1 INSPECT BRAKE WARNING LIGHT (a) Disconnect the skid control ECU connector. (b) Turn the ignition switch to the on position. (c) Check th ...

Other materials:

Problem symptoms table
HINT: If a normal code is displayed during the diagnostic trouble code check although the trouble still occurs, check the electrical circuits for each symptom in the order given in the charts on the following pages and proceed to the page given for troubleshooting. The Matrix Chart is ...

Description of initialization
(a) Perform initialization in the following cases: Before delivery of a new vehicle. After replacement of the tire pressure warning ECU*. After replacement of the tire pressure warning valve and transmitter. Specified tire pressure changes depending on the size or type of the tire. ...

Back Door ECU Communication Stop
DTC B1287 Back Door ECU Communication Stop DESCRIPTION DTC B1287 is output when communication between the power back door ECU and the multiplex network gateway ECU stops for more than 10 seconds. DTC No. DTC Detection Condition Trouble Area B1287 Back d ...

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