Inspection Procedure

WARNING: This page is about a different car, the 2005 Lexus RX 330. However, it is still accessible from the selected car via links, so may be relevant.

CHECK HARNESS AND CONNECTOR (STEREO COMPONENT SPEAKER ASSY FRONT)

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

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

Standard:

NAVIGATION ECU CONNECTOR AND STEREO COMPONENT SPEAKER ASSY FRONT CONNECTOR TERMINALS RESISTANCE

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

Fig 1: Disconnecting Navigation ECU Connector N3

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 2: Disconnecting Stereo Component Speaker Assy Front Connector T11

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: Go to next step.

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

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

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

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

Standard:

STEREO COMPONENT SPEAKER ASSY FRONT CONNECTOR AND FRONT NO 2 SPEAKER ASSY TERMINALS RESISTANCE

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

Fig 3: Identifying Stereo Component Speaker Assy Front Connector T11

Fig 4: Identifying Front No 2 Speaker Assy Connector F11

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: Go to next step.

INSPECT FRONT NO.2 SPEAKER ASSY
1. Check that the malfunction disappears when another speaker in a good condition is installed.
  OK: Malfunction disappears.
  
  HINT:
  - Connect all the connectors to the speakers.
  - When there is a possibility that either right or left front speaker is defective, inspect by interchanging the right one with the left one.
1. NG: REPLACE FRONT NO.2 SPEAKER ASSY (SEE FRONT NO. 2 SPEAKER ASSY )
2. OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE