The Sienna has a standard Secondary Collision Brake, which automatically applies the brakes in the event of a crash to help prevent secondary collisions and prevent further injuries. The Pacifica doesn’t offer a post collision braking system: in the event of a collision that triggers the airbags, more collisions are possible without the protection of airbags that may have already deployed.
Both the Sienna and Pacifica have rear cross-traffic warning, but the Sienna has Rear Cross Traffic Braking (automatically applies the brakes) to better prevent a collision when backing near traffic. The Pacifica’s Rear Cross Path Detection doesn’t automatically brake.
The Sienna’s driver alert monitor detects an inattentive driver then sounds a warning and suggests a break. According to the NHTSA, drivers who fall asleep cause about 100,000 crashes and 1500 deaths a year. The Pacifica doesn’t offer a driver alert monitor.
Both the Sienna and the Pacifica have standard driver and passenger frontal airbags, front side-impact airbags, driver knee airbags, side-impact head airbags, front seatbelt pretensioners, front wheel drive, height adjustable front shoulder belts, plastic fuel tanks, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, daytime running lights, lane departure warning systems, blind spot warning systems, rearview cameras, rear cross-path warning, available all-wheel drive and around view monitors.
The National Highway Traffic Safety Administration does side impact tests on new vehicles. In this test, which crashes the vehicle into a flat barrier at 38.5 MPH and into a post at 20 MPH, results indicate that the Toyota Sienna is safer than the Chrysler Pacifica:
|
|
Sienna |
Pacifica |
|
|
Front Seat |
|
| STARS |
5 Stars |
5 Stars |
| HIC |
42 |
72 |
| Chest Movement |
.5 inches |
1 inches |
| Abdominal Force |
123 lbs. |
149 lbs. |
| Hip Force |
348 lbs. |
395 lbs. |
|
|
Rear Seat |
|
| STARS |
5 Stars |
5 Stars |
| HIC |
52 |
66 |
| Spine Acceleration |
30 G’s |
54 G’s |
| Hip Force |
542 lbs. |
764 lbs. |
|
|
Into Pole |
|
| STARS |
5 Stars |
5 Stars |
| Max Damage Depth |
12 inches |
13 inches |
| Spine Acceleration |
31 G’s |
50 G’s |
| Hip Force |
499 lbs. |
616 lbs. |
New test not comparable to pre-2011 test results. More stars = Better. Lower test results = Better.
Side impacts caused 23% of all road fatalities in 2018, down from 29% in 2003, when the Insurance Institute for Highway Safety introduced its side barrier test. In order to continue improving vehicle safety, the IIHS has started using a more severe side impact test: 37 MPH (up from 31 MPH), with a 4189-pound barrier (up from 3300 pounds). The results of this newly developed test demonstrates that the Toyota Sienna is safer than the Pacifica:
|
|
Sienna |
Pacifica |
| Overall Evaluation |
GOOD |
ACCEPTABLE |
| Structure |
GOOD |
GOOD |
|
|
Driver Injury Measures |
|
| Head/Neck |
GOOD |
GOOD |
| Neck Tension |
201 lbs. |
335 lbs. |
| Torso |
GOOD |
GOOD |
| Shoulder Deflection |
.55 in |
.94 in |
| Shoulder Force |
178 lbs. |
223 lbs. |
| Torso Max Deflection |
.83 in |
1.26 in |
| Pelvis |
GOOD |
GOOD |
| Pelvis Force |
736 lbs. |
848 lbs. |
| Head Protection |
GOOD |
GOOD |
|
|
Passenger Injury Measures |
|
| Head/Neck |
GOOD |
GOOD |
| Head Injury Criterion |
18 |
83 |
| Neck Compression |
22 lbs. |
67 lbs. |
| Torso |
GOOD |
ACCEPTABLE |
| Shoulder Deflection |
.98 in |
1.1 in |
| Shoulder Force |
312 lbs. |
424 lbs. |
| Torso Max Deflection |
.71 in |
1.97 in |
| Torso Deflection Rate |
7 MPH |
12 MPH |
| Pelvis |
GOOD |
POOR |
| Pelvis Force |
625 lbs. |
1450 lbs. |
| Head Protection |
GOOD |
GOOD |
The Toyota Sienna has a better fatality history. The Sienna was involved in fatal accidents at a rate 31.8% lower per vehicle registered than the Pacifica, according to the Insurance Institute for Highway Safety.


