PARK ASSIST / MONITORING: BLIND SPOT MONITOR SYSTEM: DIAGNOSIS SYSTEM; 2018 - 2020 MY Sienna [11/2017

Last Modified: 04-05-2023	6.11:8.1.0	Doc ID: RM100000001980L
Model Year Start: 2018	Model: Sienna	Prod Date Range: [11/2017 - ]
Title: PARK ASSIST / MONITORING: BLIND SPOT MONITOR SYSTEM: DIAGNOSIS SYSTEM; 2018 - 2020 MY Sienna [11/2017 - ]

DIAGNOSIS SYSTEM

1. DESCRIPTION

(a) Blind spot monitor data and the Diagnostic Trouble Codes (DTCs) can be read from the Data Link Connector 3 (DLC3) of the vehicle. When the system seems to be malfunctioning, use the Techstream to check for malfunctions and to repair it.

2. CHECK DLC3

(a) Check the DLC3 (See page ).

3. DIAGNOSIS FUNCTION

(a) The blind spot monitor system displays an error message on the multi-information display to inform the driver that the system is unavailable either temporarily or due to a malfunction.

When the system is unavailable temporarily:
Multi-information display displays "Blind Spot Monitor Unavailable".
When the system is unavailable due to a malfunction:
Multi-information display displays "Blind Spot Monitor Malfunction Contact Your Dealer".

(b) The rear cross traffic alert function displays an error message on the multi-information display to inform the driver that the system is unavailable either temporarily or due to a malfunction.

When the function is unavailable temporarily:
Multi-information display displays "Rear Cross Traffic Alert Unavailable".
When the function is unavailable due to a malfunction:
Multi-information display displays "Rear Cross Traffic Alert Malfunction Contact Your Dealer".

4. ABNORMALITY HISTORY

HINT:

The abnormality history for a blind spot monitor sensor can be displayed or cleared.

(a) Check abnormality history

(1) Connect the Techstream to the DLC3.

(2) Turn the ignition switch to ON.

(3) Turn the Techstream on.

(4) Turn the blind spot monitor system on.

(5) Enter the following menus: Body Electrical / Blind Spot Monitor Master or Blind Spot Monitor Slave / Utility / BSM Master Abnormal History or BSM Slave Abnormal History.

(6) Check the results displayed for the abnormality history check.

HINT:

If "Yes" is displayed, check the suspected area column for each item.
Abnormality history is stored only for the blind spot monitor sensor for which an abnormality has been detected.
If "No" is displayed, proceed to the next suspected area shown in the Problem Symptoms Table (See page ).

Abnormality History Table

Tester Display	Item Explanation	Suspected Area
History of Module Blockage	History of blind spot monitor sensor detection problems due to snow, rain etc. on the bumper	Check if a bumper compatible with the blind spot monitor (such as an original equipment bumper) is installed Check if any foreign objects are attached to the bumper Check if any foreign objects are present between the bumper and sensors
History of Low Voltage	History of low supply battery voltage from battery to the blind spot monitor sensor	Power Source Circuit (See page )
History of High Voltage	History of high supply battery voltage from battery to the blind spot monitor sensor	Power Source Circuit (See page )
History of Low Temperature	History of low temperature for the blind spot monitor sensor	Check the outside temperature
History of High Temperature	History of high temperature for the blind spot monitor sensor	Check the outside temperature

(b) Clearing abnormality history

(1) Connect the Techstream to the DLC3.

(2) Turn the ignition switch to ON.

(3) Turn the Techstream on.

(4) Turn the blind spot monitor system on.

(5) Enter the following menus: Body Electrical / Blind Spot Monitor Master or Blind Spot Monitor Slave / Utility / BSM Master Abnormal History or BSM Slave Abnormal History

(6) Clear the BSM Master Abnormal History and/or BSM Slave Abnormal History.