Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM100000001900S
Model Year Start: 2018 Model: Sienna Prod Date Range: [11/2017 -           ]
Title: NAVIGATION / MULTI INFO DISPLAY: NAVIGATION SYSTEM: Reverse Signal Circuit; 2018 - 2020 MY Sienna [11/2017 -        ]

Reverse Signal Circuit

DESCRIPTION

The radio and display receiver assembly receives a reverse signal from the park/neutral position switch.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • When replacing the radio and display receiver assembly, always replace it with a new one. If a radio and display receiver assembly which was installed to another vehicle is used, the following may occur:
    • A communication malfunction DTC is stored.
    • The radio and display receiver assembly may not operate normally.
  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1.

CHECK VEHICLE SIGNAL (OPERATION CHECK)

(a) Enter the "Vehicle Signal Check Mode" screen. [Refer to Check Vehicle Signal in Operation Check (See page 2018 - 2020 MY Sienna [11/2017 -        ]; NAVIGATION / MULTI INFO DISPLAY: NAVIGATION SYSTEM: OPERATION CHECK )].

(b) Check that the display changes between ON and OFF according to the shift lever position.

HINT:

This display is updated once per second. As a result, it is normal for the display to lag behind the actual shift lever position.

OK:

Shift Lever Position

Display

R

ON

Except R

OFF
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

(See page 2018 MY Sienna [11/2017 - 08/2018]; NAVIGATION / MULTI INFO DISPLAY: NAVIGATION SYSTEM: PROBLEM SYMPTOMS TABLE 2019 - 2020 MY Sienna [08/2018 -        ]; NAVIGATION / MULTI INFO DISPLAY: NAVIGATION SYSTEM: PROBLEM SYMPTOMS TABLE )
NG

2.

CHECK RADIO AND DISPLAY RECEIVER ASSEMBLY

(a) Disconnect the radio and display receiver assembly connector.

*a

Front view of wire harness connector

(to Radio and Display Receiver Assembly)

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

D195-28 (REV) - Body ground

Ignition switch ON, shift lever in R

7.5 to 14 V

D195-28 (REV) - Body ground

Ignition switch ON, shift lever not in R

Below 1 V
OK

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

NG

3.

CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - PARK/NEUTRAL POSITION SWITCH)

(a) Disconnect the D195 radio and display receiver assembly connector.

(b) Disconnect the B66 park/neutral position switch connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

D195-28 (REV) - B66-2 (RL)

Always

Below 1 Ω

D195-28 (REV) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

4.

CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH - BATTERY)

(a) Disconnect the park/neutral position switch connector.

*a

Front view of wire harness connector

(to Park/neutral Position Switch)

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

B66-1 (RB) - Body ground

Ignition switch ON

11 to 14 V

Result

Result

Proceed to

OK (for UA80E)

A

OK (for UA80F)

B

NG

C
A

REPLACE PARK/NEUTRAL POSITION SWITCH

B

REPLACE PARK/NEUTRAL POSITION SWITCH

C

REPAIR OR REPLACE HARNESS OR CONNECTOR