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
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.
(c) Measure the voltage according to the value(s) in the table below.
Standard voltage
5 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
(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
(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.
(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.
(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.
(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:
No Answer-Back (Hazard Warning Light and Wireless Door Lock
Buzzer)
DESCRIPTION
If there is no answer-back of the hazard light signal and the wireless door lock
buzzer although the
wireless control function is operating normally, there might be a malfunction in
the hazard light signal and
the wireless door lock buzzer signal which are output from the multiple ...
Removal
1. Remove engine under cover no.1
2. Disconnect cable from negative battery
terminal
3. Drain automatic transaxle fluid (see page
ax-131)
4. Remove automatic transaxle oil pan subassembly
(a) Remove the 18 bolts, oil pan and gasket.
NOTICE:
Some fluid will remain in the oil pan. ...
Half Connection in Center Airbag Sensor
Assembly Connectors
DTC B1135/24 Half Connection in Center Airbag Sensor
Assembly Connectors
DESCRIPTION
The center airbag sensor assembly connector has a mechanism that electrically
detects half connection.
The center airbag sensor assembly monitors the voltage applied to the
disconnection detection pins and ...
