Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM100000000VJHV
Model Year Start: 2016 Model: Sienna Prod Date Range: [12/2015 - 08/2016]
Title: THEFT DETERRENT / KEYLESS ENTRY: THEFT DETERRENT SYSTEM: PROBLEM SYMPTOMS TABLE; 2016 MY Sienna [12/2015 - 08/2016]

PROBLEM SYMPTOMS TABLE

HINT:

  • Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
  • Inspect the fuses and relays related to this system before inspecting the suspected areas below.

Theft Deterrent System

Symptom

Suspected Area

See page

Theft deterrent system cannot be set

Security indicator light circuit

2016 - 2020 MY Sienna [12/2015 -        ]; THEFT DETERRENT / KEYLESS ENTRY: THEFT DETERRENT SYSTEM: Security Indicator Light Circuit

ECU power source circuit

2016 - 2020 MY Sienna [12/2015 -        ]; THEFT DETERRENT / KEYLESS ENTRY: THEFT DETERRENT SYSTEM: ECU Power Source Circuit

Unlock warning switch circuit*

2016 - 2020 MY Sienna [12/2015 -        ]; THEFT DETERRENT / KEYLESS ENTRY: THEFT DETERRENT SYSTEM: Unlock Warning Switch Circuit

Front door lock assembly

2016 - 2020 MY Sienna [12/2015 -        ]; DOOR LOCK: FRONT DOOR LOCK: INSPECTION

Slide door lock assembly

2016 - 2020 MY Sienna [12/2015 -        ]; DOOR LOCK: SLIDE DOOR LOCK: INSPECTION

Back door lock assembly

2016 - 2020 MY Sienna [12/2015 -        ]; DOOR LOCK: BACK DOOR LOCK: INSPECTION

Door courtesy switch circuit

2016 - 2020 MY Sienna [12/2015 -        ]; LIGHTING (INT): LIGHTING SYSTEM: Door Courtesy Switch Circuit

Back door lock assembly (Back door courtesy switch)

2016 - 2020 MY Sienna [12/2015 -        ]; DOOR / HATCH: BACK DOOR CLOSER SYSTEM: B2251; Back Door Closer Switch Malfunction

Engine hood courtesy switch circuit

2016 - 2020 MY Sienna [12/2015 -        ]; THEFT DETERRENT / KEYLESS ENTRY: THEFT DETERRENT SYSTEM: Engine Hood Courtesy Switch Circuit

If the symptom(s) still occur after the above areas are inspected and proved to be normal, replace the main body ECU

2016 - 2020 MY Sienna [12/2015 -        ]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

Security indicator does not blink when theft deterrent system is set

Security indicator light circuit

2016 - 2020 MY Sienna [12/2015 -        ]; THEFT DETERRENT / KEYLESS ENTRY: THEFT DETERRENT SYSTEM: Security Indicator Light Circuit

If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the main body ECU

2016 - 2020 MY Sienna [12/2015 -        ]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

Alarm sounding state cannot be canceled when ignition switch is turned to ON*

Ignition switch circuit

2016 MY Sienna [12/2015 - 08/2016]; THEFT DETERRENT / KEYLESS ENTRY: THEFT DETERRENT SYSTEM: Ignition Switch Circuit

Unlock warning switch circuit

2016 - 2020 MY Sienna [12/2015 -        ]; THEFT DETERRENT / KEYLESS ENTRY: THEFT DETERRENT SYSTEM: Unlock Warning Switch Circuit

If the symptom(s) still occur after the above areas are inspected and proved to be normal, replace the main body ECU

2016 - 2020 MY Sienna [12/2015 -        ]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

Theft deterrent system can be set even when door is open

Door courtesy switch circuit

2016 - 2020 MY Sienna [12/2015 -        ]; LIGHTING (INT): LIGHTING SYSTEM: Door Courtesy Switch Circuit

If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the main body ECU

2016 - 2020 MY Sienna [12/2015 -        ]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

Theft deterrent system can be set even when engine hood is open.

Engine hood courtesy switch circuit

2016 - 2020 MY Sienna [12/2015 -        ]; THEFT DETERRENT / KEYLESS ENTRY: THEFT DETERRENT SYSTEM: Engine Hood Courtesy Switch Circuit

If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the main body ECU

2016 - 2020 MY Sienna [12/2015 -        ]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

Vehicle horns (low pitched, high pitched) do not sound while theft deterrent system is in warning operation

Horn circuit

2016 MY Sienna [12/2015 - 08/2016]; THEFT DETERRENT / KEYLESS ENTRY: THEFT DETERRENT SYSTEM: Horn Circuit

If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the main body ECU

2016 - 2020 MY Sienna [12/2015 -        ]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

Headlights do not blink while theft deterrent system is in warning operation

Headlight relay circuit

2016 MY Sienna [12/2015 - 08/2016]; LIGHTING (EXT): LIGHTING SYSTEM: Headlight Relay Circuit

If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the main body ECU

2016 - 2020 MY Sienna [12/2015 -        ]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

Taillights do not blink while theft deterrent system is in warning operation

Taillight relay circuit

2016 MY Sienna [12/2015 - 08/2016]; LIGHTING (EXT): LIGHTING SYSTEM: Taillight Relay Circuit

If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the main body ECU

2016 - 2020 MY Sienna [12/2015 -        ]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

Hazard warning lights do not flash while theft deterrent system is in warning operation

Wire harness or connector

-

Combination meter assembly

2016 - 2020 MY Sienna [12/2015 -        ]; METER / GAUGE / DISPLAY: COMBINATION METER: REMOVAL

If the symptom(s) still occur after the above areas are inspected and proved to be normal, replace the main body ECU

2016 - 2020 MY Sienna [12/2015 -        ]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

Interior light does not light up while theft deterrent system is in warning operation

Interior light circuit

2016 MY Sienna [12/2015 - 08/2016]; LIGHTING (INT): LIGHTING SYSTEM: Interior Light Circuit

If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the main body ECU

2016 - 2020 MY Sienna [12/2015 -        ]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

Security horn does not sound while theft deterrent system is in warning operation

Security horn circuit

2016 MY Sienna [12/2015 - 08/2016]; THEFT DETERRENT / KEYLESS ENTRY: THEFT DETERRENT SYSTEM: Security Horn Circuit

If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the main body ECU

2016 - 2020 MY Sienna [12/2015 -        ]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

Headlights blink even when theft deterrent system is not set

Headlight relay circuit

2016 MY Sienna [12/2015 - 08/2016]; LIGHTING (EXT): LIGHTING SYSTEM: Headlight Relay Circuit

If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the main body ECU

2016 - 2020 MY Sienna [12/2015 -        ]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

Taillights blink even when theft deterrent system is not set

Taillight relay circuit

2016 MY Sienna [12/2015 - 08/2016]; LIGHTING (EXT): LIGHTING SYSTEM: Taillight Relay Circuit

If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the main body ECU

2016 - 2020 MY Sienna [12/2015 -        ]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

Hazard warning lights flash even when theft deterrent system is not set

Wire harness or connector

-

Combination meter assembly

2016 - 2020 MY Sienna [12/2015 -        ]; METER / GAUGE / DISPLAY: COMBINATION METER: REMOVAL

If the symptom(s) still occur after the above areas are inspected and proved to be normal, replace the main body ECU

2016 - 2020 MY Sienna [12/2015 -        ]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

Interior light comes on even when theft deterrent system is not set

Interior light circuit

2016 MY Sienna [12/2015 - 08/2016]; LIGHTING (INT): LIGHTING SYSTEM: Interior Light Circuit

If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the main body ECU

2016 - 2020 MY Sienna [12/2015 -        ]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

*: w/o Smart Key System