| Last Modified: 11-29-2007 | 1.6 J | |
| Service Category: Audio/Visual/Telematics | Section: Navigation/Multi Info Display | |
| Model Year: 2008 | Model: Sequoia | Doc ID: RM0000014ST029X |
| Title: NAVIGATION / MULTI INFO DISPLAY: NAVIGATION SYSTEM: DESCRIPTION (2008 Sequoia) | ||
|
Microphone Circuit between Microphone and Navigation Receiver Assembly |
DESCRIPTION
This circuit sends a microphone signal from the microphone amplifier assembly to the navigation receiver assembly.
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
|
1. |
CHECK HARNESS AND CONNECTOR (TSW- - SGND) |
|
(a) Disconnect the I7 navigation receiver assembly connector. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
I7-12(TSW-) - I7-18(SGND) |
Always |
Below 1 Ω |
|
I7-12(TSW-) - Body ground |
Always |
10 kΩ or higher |
(c) Reconnect the navigation receiver assembly connector.
|
|
2. |
CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER - MICROPHONE AMPLIFIER ASSEMBLY) |
|
(a) Disconnect the I7 navigation receiver assembly connector. |
(b) Disconnect the U7 roof console box assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
I7-17 (MACC) - U7-10 (ACC) |
Always |
Below 1 Ω |
|
I7-19 (MIC+) - U7-9 (MI1+) |
||
|
I7-20 (MIC-) - U7-8 (MIC-) |
||
|
I7-17 (MACC) - Body ground |
Always |
10 kΩ or higher |
|
I7-19 (MIC+) - Body ground |
||
|
I7-20 (MIC-) - Body ground |
(d) Reconnect the navigation receiver assembly connector.
(e) Reconnect the roof console box assembly connector.
|
|
3. |
INSPECT NAVIGATION RECEIVER ASSEMBLY (MACC VOLTAGE) |
|
(a) Reconnect the I7 navigation receiver assembly connector. |
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
I7-17 (MACC) - Body ground |
Ignition switch ACC |
4 to 6 V |
(c) Reconnect the navigation receiver assembly connector.
|
|
4. |
REPLACE MICROPHONE AMPLIFIER ASSEMBLY WITH ANOTHER AND CHECK |
(a) Replace the telephone microphone assembly with a normal one
.
(b) Check if the same problem occurs again.
OK:
Malfunction disappears
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