Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM1000000018QT3
Model Year Start: 2018 Model: Sienna Prod Date Range: [11/2017 -           ]
Title: NAVIGATION / MULTI INFO DISPLAY: NAVIGATION SYSTEM: Voice Guidance does not Function; 2018 - 2020 MY Sienna [11/2017 -        ]

Voice Guidance does not Function

WIRING DIAGRAM

PROCEDURE

1.

CHECK VOICE GUIDANCE SETTING

(a) Check that the voice guidance settings are not off.

OK:

Voice guidance settings are not off.

NG

CHANGE THE VOICE GUIDANCE SETTINGS TO ON

OK

2.

CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - NAVIGATION ECU)

(a) Disconnect the D197 radio and display receiver assembly connector.

(b) Disconnect the D199 navigation ECU connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D197-22 (SI+) - D199-6 (VOI+)

Always

Below 1 Ω

D197-23 (SI-) - D199-7 (VOI-)

Always

Below 1 Ω

D197-22 (SI+) or D199-6 (VOI+) - Body ground

Always

10 kΩ or higher

D197-23 (SI-) or D199-7 (VOI-) - Body ground

Always

10 kΩ or higher

D199-8 (SLD1) - Body ground

Always

10 kΩ or higher

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE 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

REPAIR OR REPLACE HARNESS OR CONNECTOR