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Toyota Sienna Service Manual: Problem symptoms table

If there are no DTCs output but the problem still occurs, check the circuits for each problem symptom in the order given in the table below and proceed to the relevant troubleshooting page.

NOTICE: When replacing the brake actuator assembly, sensor, etc., turn the ignition switch off.

HINT: Inspect the fuse and relay before investigating the suspected areas as shown in the table below. Inspect each malfunction circuit in numerical order for the corresponding symptom.

Anti-lock brake system:

Anti-lock brake system

Terminals of ecu

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 functio ...

Diagnosis system
1. DESCRIPTION (a) Release the parking brake pedal. (b) Check the warning lights. When ignition switch is turned ON, check that the ABS warning light and brake warning light come on for 3 ...

Other materials:

Brake Switch "A" Circuit
DTC P0571 Brake Switch "A" Circuit DESCRIPTION When the brake pedal is depressed, the stop light switch sends a signal to the ECM. When the ECM receives this signal, it cancels the cruise control. The fail-safe function operates to enable normal driving even if there is a malfuncti ...

Rear Occupant Classification Sensor LH Collision Detection
DTC B1787 Rear Occupant Classification Sensor LH Collision Detection DESCRIPTION DTC B1787 is output when the occupant classification ECU receives a collision detection signal sent by the rear occupant classification sensor LH if an accident occurs. DTC B1787 is also output when the front s ...

Inspection
1. INSPECT GARAGE DOOR OPENER  Press the switch and check that each red LED turns on. If one or more of the switches does not turn on the LED, confirm normal operation of the fuse and wire harness, then replace the garage door opener. 2. INSPECT GARAGE DOOR OPENER REGISTRATION ...

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