- Telephone ECU assembly
- Map light assembly
- Microphone amplifier assembly
- Harness or connector
| Last Modified: 11-27-2007 | 1.6 C | |
| Service Category: Audio/Visual/Telematics | Section: Cellular Communication | |
| Model Year: 2008 | Model: LX570 | Doc ID: RM000001EG100DX |
| Title: CELLULAR COMMUNICATION: LEXUS LINK SYSTEM: DESCRIPTION (2008 LX570) | ||
|
DTC |
4-3 |
Overhead Module Microphone Error |
DESCRIPTION
This DTC is stored when one of the following occurs: 1) the telephone ECU assembly is malfunctioning; 2) the map light assembly is malfunctioning; 3) the microphone amplifier is malfunctioning; or 4) the wire harness between the telephone ECU assembly and map light is open or shorted.
|
DTC Code |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
4-3 |
Communication or the communication line is abnormal between the telephone ECU assembly and microphone amplifier (located in the map light assembly). |
|
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
|
1. |
CHECK NAVIGATION SYSTEM |
(a) Start the navigation system and check that the voice recognition microphone function operates normally.
Result
|
Result |
Proceed to |
|---|---|
|
Microphone function is normal |
A |
|
Microphone function is malfunctioning |
B |
|
|
2. |
CHECK HARNESS AND CONNECTOR (TELEPHONE ECU ASSEMBLY - MAP LIGHT ASSEMBLY) |
(a) Disconnect the P2 ECU connector.
(b) Disconnect the R7 map light connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
P2-7 (MCVD) - R7-22 (ACC) |
Always |
Below 1 Ω |
|
P2-7 (MCVD) or R7-22 (ACC) - Body ground |
Always |
10 kΩ or higher |
|
|
3. |
CHECK HARNESS AND CONNECTOR (MAP LIGHT ASSEMBLY - BODY GROUND) |
|
(a) Disconnect the R7 map light connector. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
R7-16 (GND9) - Body ground |
Always |
Below 1 Ω |
|
|
4. |
CHECK MAP LIGHT ASSEMBLY (OPERATION) |
(a) Temporarily replace the map light with a new or normally functioning one
.
(b) Check if DTC 4-3 is output.
OK:
DTC 4-3 is not output.
|
|
5. |
REPLACE TELEPHONE ECU ASSEMBLY TOGETHER WITH MAYDAY BATTERY |
|
|
|