Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM100000000ZX6T
Model Year Start: 2017 Model: Sienna Prod Date Range: [08/2016 - 11/2017]
Title: CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM: P157000; Radar Sensor; 2017 MY Sienna [08/2016 - 11/2017]

DTC

P157000

Radar Sensor

DESCRIPTION

The millimeter wave radar sensor emits radar beams toward an object in front and measures the distance and direction of the object by receiving the beam reflections. Based on the reflections, the sensor calculates the difference in speed between your own vehicle and the object in front. This data is transmitted to the driving support ECU.

DTC No.

DTC Detection Condition

Trouble Area

MIL

P157000

The ECM detects a radar sensor malfunction signal for 0.15 seconds or more while the dynamic radar cruise control is in operation

Millimeter wave radar sensor

Does not come on

HINT:

The millimeter wave radar sensor monitors the millimeter wave circuit activation by itself. This DTC is output when one of the following occurs: 1) the monitor is malfunctioning, 2) an EEPROM error is detected, 3) a voltage error is detected, and 4) the radar sensor is not adjusted. When raindrops or snowflakes strike the millimeter wave radar sensor face, the distance between the vehicle in front and your own vehicle cannot be measured correctly. The dynamic radar cruise control system functions by detecting the beam reflections from the vehicle directly in front. In the following cases, the system may not be able to detect the vehicle in front and may not properly maintain the correct vehicle-to-vehicle distance:

  • The vehicle in front is a tall trailer.
  • There are heavy emissions from a vehicle in front or vehicles in other lanes.

CAUTION / NOTICE / HINT

NOTICE:

When the millimeter wave radar sensor is replaced with a new one, adjustment of the radar sensor beam axis must be performed (See page 2016 - 2017 MY Sienna [12/2015 - 11/2017]; CRUISE CONTROL: MILLIMETER WAVE RADAR SENSOR: ADJUSTMENT ).

PROCEDURE

1.

ADJUST MILLIMETER WAVE RADAR SENSOR

(a) Adjust the millimeter wave radar sensor (See page 2016 - 2017 MY Sienna [12/2015 - 11/2017]; CRUISE CONTROL: MILLIMETER WAVE RADAR SENSOR: ADJUSTMENT ).

NEXT

2.

CHECK DTC

(a) Clear the DTCs (See page 2017 MY Sienna [08/2016 - 11/2017]; CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM: DTC CHECK / CLEAR ).

(b) Perform the following to make sure that the DTC detection conditions are met.

HINT:

If the detection conditions are not met, the malfunction cannot be detected.

(1) Drive the vehicle at a speed of 50 km/h (30 mph) or more.

(2) Turn the cruise control main switch on.

(c) Check for DTCs (See page 2017 MY Sienna [08/2016 - 11/2017]; CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM: DTC CHECK / CLEAR ).

Result

Result

Proceed to

DTC is not output

A

DTC P157000 is output

B

A

END

B

REPLACE MILLIMETER WAVE RADAR SENSOR