Navigation Voice Speaker Circuit: Wiring Diagram

WARNING: This page is about a different car, the 2006 Lexus RX 400h. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Navigation Voice Speaker Circuit - Wiring Diagram

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

CHECK HARNESS AND CONNECTOR (NAVIGATION ECU - FRONT STEREO COMPONENT SPEAKER)

Disconnect the navigation ECU connector N3 and front stereo component speaker connector T11.

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

Resistance

CONNECTOR TERMINAL RESISTANCE SPECIFICATION

Tester connection	Condition	Specified condition
TWL+ - AUO+	Always	Below 1 Ω
TWL- - AUO-	Always	Below 1 Ω
TWL+ - Body ground	Always	10 kΩ or higher
TWL- - Body ground	Always	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig 2: Identifying ECU Connector N3 And Front Stereo Component Speaker Connector T11

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: GO TO NEXT STEP.

INSPECT FRONT STEREO COMPONENT SPEAKER
1. Check that the malfunction disappears when another speaker in good condition is installed.
  OK: Malfunction disappears.
  
  HINT:
  - Connect all the connectors to the speakers.
  - When there is a possibility that either the right or left front speaker is defective, inspect by interchanging the right one with the left one.
OK: REPLACE FRONT STEREO COMPONENT SPEAKER

NG: GO TO NEXT STEP.

CHECK HARNESS AND CONNECTOR (FRONT NO.2 SPEAKER - FRONT STEREO COMPONENT SPEAKER)

Disconnect the connectors from the front No.2 speaker and front stereo component speaker.

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

Resistance

CONNECTOR TERMINAL RESISTANCE SPECIFICATION

Tester connection	Condition	Specified condition
T11-1 - F11-2	Always	Below 1 Ω
T11-3 - F11-1	Always	Below 1 Ω
T11-1 - Body ground	Always	10 kΩ or higher
T11-3 - Body ground	Always	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig 3: Identifying Front Stereo Component Speaker Connector T11

OK: GO TO NEXT STEP.

INSPECT FRONT NO.2 SPEAKER
1. Check that the malfunction disappears when another speaker in good condition is installed.
  OK: Malfunction disappears.
  
  HINT:
  - Connect all the connectors to the speakers.
  - When there is a possibility that either the right or left front speaker is defective, inspect by interchanging the right one with the left one.
NG: REPLACE FRONT NO.2 SPEAKER

OK: RETURN TO THE ORIGINAL INSPECTION FLOW BECAUSE THE CHECK RESULT IS NORMAL